Optiva RF-Over-Fiber Design Tool User s Guide Revision 1.0 March 27, 2015
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Table of Contents RF-OVER-FIBER DESIGN TOOL OVERVIEW... 4 LOGIN... 5 CREATE USER ACCOUNT... 6 USER INPUTS... 8 FIBEROPTIC TRANSMITTER AND RECEIVER SELECTION... 9 FIBEROPTIC LINK PARAMETERS... 13 INPUT SIGNAL DEFINITION... 14 FIBEROPTIC TRANSMITTER/RECEIVER RF GAIN SETTINGS... 15 CWDM/DWDM SETTINGS... 18 FIBER AMPLIFIER (EDFA) SETTINGS... 20 EQUIPMENT CONFIGURATION PARAMTERS... 22 COMPUTED OUTPUTS... 26 SIGNAL INDEPENDENT PERFORMANCE... 26 Link Gain... 26 Noise Figure... 27 Spur Free Dynamic Range (SFDR)... 27 SFDR (2-tone)... 27 1 db Dynamic Range... 28 Input IP3... 28 Input 1dB Compression... 29 Output IP3... 30 Output 1dB Compression... 30 SIGNAL DEPENDENT PERFORMANCE... 31 RF Input Power... 31 RF Output Power... 31 Fiberoptic Receiver Input Optical Power... 32 Subsystem Carrier-to-Noise... 33 Subsystem Carrier-to-Interferer... 33 PARTS LIST AND MESSAGES... 34 PARTS LIST... 34 SPECIAL MESSAGES... 35 SUBSYSTEM BLOCK DIAGRAM... 36 SAVING CONFIGURATIONS... 37 RETRIEVING CONFIGURATIONS... 39 CONTACT US... 42 LOGOUT... 44 DOCUMENT REVISION HISTORY... 46
RF-Over-Fiber Design Tool Overview This document describes the use of the Optiva RF-Over-Fiber Design Tool. For a user-defined set of conditions, the Design Tool provides a means to estimate system fiberoptic subsystem RF performance for a variety of equipment and module settings. In addition to illustrating performance trades, the Design Tool also generates an equipment list based on current settings. The basic RF-over-fiber link is shown in Figure 1. The input to the system is a single RF cable connection consisting of a single, or multiple, RF carriers. The output to the system is the same RF signal attenuated (or amplified) by the link gain, and affected by the noise and distortion characteristics of the fiberoptic subsystem. Figure 1. Basic Fiberoptic Link Model The basic fiberoptic transmitter consists of an adjustable RF pre-amplifier and a laser diode. The basic fiberoptic receiver consists of a photodiode and an adjustable RF postamplier. The fiber portion of the link is modeled as a user defined length of fiber plus any passive losses that are present (e.g., patch panel losses, connector losses, splice losses). Optical amplification and wavelength multiplexing can also be modeled. These characteristics are discussed later in this document. 4 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Login To launch the RF Over Fiber Design Tool, enter the Username and Password that was created previously. The RF Over Fiber Design Tool Login window is shown in Figure 2. After successfully logging in, the window shown in Figure 5 will be presented. Figure 2. Login Window 5 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Create User Account If a user account does not currently exist, one must be created by clicking on the link shown in Figure 3. Figure 3. Link to Create User Account 6 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The Create User Account page is shown in Figure 4. Accounts are used for various purposes. Within the RF Over Fiber Design Tool, users may create and save specific fiberoptic subsystem configurations. Configurations are associated with accounts, therefore one only has access to their saved configurations. Periodically, revisions will be made to the application. Users will be notified of this by means of the email address provided for the User Profile. Figure 4. Create User Account Window All fields are required with the exception of Phone and the second Address line. There is input for Security Question and Answer for the purpose of forgotten password retrieval, however this feature has not currently been added to the application. Click the Create User button to proceed to the application main window. 7 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
User Inputs Upon successfully logging in to the Design Tool, the window shown in Figure 5 is presented. Figure 5. Start Window Four options are presented on this window. 1. Choose frequency band to start a new subsystem model 2. Load previously saved configuration 3. Go to Contact Us page to send a message to the administrator 4. Exit 8 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Fiberoptic Transmitter and Receiver Selection Choosing an RF frequency band is the first step in defining the fiberoptic subsystem. Many of the additional options provided are dependent upon which frequency band is selected. L-Band roughly covers the bandwidth range 50 3000 MHz. Upon selecting the L-Band option, a drop down menu appears directly below as shown in Figure 6, which lists the options for L-Band fiberoptic transmitter. Figure 6. L-Band Fiberoptic Transmitter Options L-Band optical output power is listed in the dropdown menu. All other things being equial, higher output power from the transmitter results in a higher input optical, which in turn leads to better receiver noise performance. The lasers within transmitters may be uncooled or cooled. All other things being equal, cooled transmitters (i.e., lasers) have better noise performance (lower laser RIN). CWDM and DWDM transmitter options are also provided. Also, in cases where optical losses are high (high passive losses and/or long fiber distances), 1550 nm and DWDM transmitters may be optically amplified by using EDFAs. 9 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The dual +6 dbm 1310 nm transmitter is essentially a higher density (x2) version of the standard +6 dbm 1310 nm transmitter. L-Band fiberoptic links also provide the option for a higher sensitivity fiberoptic receiver, shown in Figure 7. The higher receiver sensitivity provides higher RF gain and slightly better noise performance. High Sensitivity is usually desired when the optical input to the fiberoptic receiver is low (e.g., < -25 dbm), however High Sensitivity receivers can be used in all situations as the maximum optical input level is the same as the Standard version receiver. Datasheets for the L-Band fiberoptic transmitters and receivers can be found at the following. http://www.jencotech.com/rf-microwave-transport.php#tab1 Figure 7. L-Band Receiver Sensitivity Option 10 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The Satcom bands are specific to generally used antenna uplink and downlink frequencies. Upon selecting the Satcom option, a drop down menu appears directly below as shown in Figure 8, which lists the options for Satcom Band fiberoptic transmitters. Appropriate fiberoptic receivers are automatically selected. Figure 8. Satcom Transmitter/Receiver Sensitivity Option 11 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The Wideband Microwave bands are shown in Figure 9. Upon selecting the Microwave option, a drop down menu appears directly below, which lists the options for Wideband Microwave fiberoptic transmitters. Appropriate fiberoptic receivers are automatically selected. The high frequency rolloff is provided in the transmitter dropdown list. The low frequency rolloff may be selected from the dropdown list to the right. Valid options are 50, 100, 500, and 1000 MHz. Note that some RF connector and lower rolloff options may not be available. These will be listed in the notes below the bar graphs. For example, when selecting the 40 GHz fiberoptic link, the lower frequency rolloff will be 2000 MHz if RF gain is added to either the transmitter or receiver. Figure 9. Satcom Transmitter/Receiver Sensitivity Option Datasheets for the Satcom and Microwave fiberoptic transmitters and receivers can be found at the following. http://www.jencotech.com/rf-microwave-transport.php#tab2 12 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Fiberoptic Link Parameters Fiberoptic link characteristics are entered into the Design Tool as shown in Figure 10. Passive losses are input as the sum of all passive losses in the fiberoptic link (e.g. fiber patch panel losses, optical connector losses, fiber splice losses, etc.). As a rule of thumb, a single patch panel loss is on the order of 0.5 db. Note: If CWDM or DWDM configurations are selected, the insertion losses for the optical MUX and DEMUX are automatically included otherwise and should NOT be included within this passive loss input. Fiber length is input as a distance in kilometers between the fiberoptic transmitter and the fiberoptic receiver. The Number of Optical Links entry represents the number of fiberoptic transmitter/receiver pairs. For non- CWDM/DWDM subsystems, this is essentially the number of optical fibers required in the subsystem. This input is primarily used for the computation of the Parts List. For CWDM/DWDM configurations, this input also determines the numer and size of WDM MUX/DEMUX pairs required. Figure 10. Fiberoptic Link Parameter Input 13 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Input Signal Definition The characteristics of the RF input signal to the fiberoptic subsystem may also be input as shown in Figure 11. This input is used to calculate an estimate of the signal C/N (carrier-to-noise) and C/I (carrierto-interferer) at the subsystem output. The signal characteristics entered are assumed to be per transmitter. Signals are modeled as RF carrier tones. Number of Carriers is the total number of RF signals/carriers that make up the RF input signal. Channel Bandwidth represents the separation of the carriers (MHz). Carriers are assumed to be equally spaced. This bandwidth is essentially the noise bandwidth of a single carrier. The Channel Bandwidth is used to compute a carrier-to-noise ratio for the individual carriers. Signal Power represents the average RF power in a single carrier (dbm/carrier). All carriers are assumed to have the same signal level (i.e., average power). Figure 11. RF Input Signal Characteristics 14 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Fiberoptic Transmitter/Receiver RF Gain Settings A key to optimizing the fiberoptic subsystem RF performance to meet particular requirements is the RF gain settings within the fiberoptic transmitters and receivers. All fiberoptic transmitters contain an RF preamplifier. All fiberoptic receivers contain an RF post-amplifier. The gain options common to all L-Band transmitters and receivers are shown in Figure 12. L-Band transmitters and receivers may be tuned over this entire range. That is, a single part number may be tuned over this range the transmitter and receiver part numbers (in the Parts List) do not change. Figure 12. L-Band RF Pre- and Post-Amplifier Gain Settings 15 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The gain options common to all Satcom Band transmitters and receivers are shown in Figure 13. With respect to part numbers, Satcom Band transmitters and receivers may be tuned over either the higher end or the lower end of this RF gain range. All possible gain settings are shown in the dropdown list. For gain settings in the range of 0 15 db, a unique part number is generated. For gain settings in the rage 20 35 db, a different unique part number is generated. That is, a single part number may be tuned over a 15 db range. Figure 13. Satcom Band RF Pre- and Post-Amplifier Gain Settings 16 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The gain options common to all Wideband Microwave Band transmitters and receivers are shown in Figure 14. With respect to part numbers, each RF gain setting corresponds to a fixed amplifier gain level. That is, Wideband Microwave transmitters and receivers are configured with a fixed gain and this cannot be adjusted in the field. All possible gain settings are shown in the dropdown list, and the unique part numbers are generated and shown in the Parts List. Figure 14. Wideband Microwave Band RF Pre- and Post-Amplifier Gain Settings 17 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
CWDM/DWDM Settings L-Band fiberoptic transmitters may be selected to transmit coarse wavelength division multiplexed (CWDM) or dense wavelength division multiplexed (DWDM) wavelengths. The different wavelengths are multiplexed onto a single fiber using a MUX/DEMUX pair at either end of the fiberoptic link. Figure 15 shows the CWDM and DWDM fiberoptic transmitter options for L-band. Note that the wavelength MUX and DEMUX are inserted into the block diagram at the top of the page. 4-, 8-, and 16- wavelength MUX/DEMUX options are available. The size of the MUX/DEMUX is determined by the Number of Optical Links required, as shown in Figure 15. In this example, a 4-wavelength MUX/DEMUX is appropriate. If the Number of Optical Links is increased to 6, an 8-wavelength MUX/DEMUX would be required. Figure 15. L-Band CWDM and DWDM Option Settings If the Number of Optical Links is greater than 16, a suitable combination of 4-, 8-, and/or 16-wavelength MUX/DEMUX is used. For example, if the Number of Optical links is 20, an 8-wavelength and a 16- wavelength MUX/DEMUX are used. Such a subsystem would require two optical fibers (one for each MUX/DEMUX pair. In such a case, the subsystem RF performance parameters that are calculated and shown are based on the higher order (16 in this case) MUX/DEMUX pair. There is a subsystem RF performance difference between the two, as the optical insertion loss is different between the 4-, 8-, and 16-wavelength MUX/DEMUX pairs. 18 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Satcom and Wideband Microwave fiberoptic transmitters may be selected to transmit dense wavelength division multiplexed (DWDM) wavelengths. The different wavelengths are multiplexed onto a single fiber using a MUX/DEMUX pair at either end of the fiberoptic link. Figure 16 shows the DWDM fiberoptic transmitter setting. Again, the wavelength MUX and DEMUX are inserted into the block diagram at the top of the page. 4-, 8-, and 16-wavelength MUX/DEMUX options are available. The size of the MUX/DEMUX is determined by the Number of Optical Links required, as shown in Figure 16. In this example, a 4-wavelength MUX/DEMUX is appropriate. If the Number of Optical Links is increased to 6, an 8-wavelength MUX/DEMUX would be required. Figure 16. Satcom and Wideband Microwave Band DWDM Option Setting If the Number of Optical Links is greater than 16, a suitable combination of 4-, 8-, and/or 16-wavelength MUX/DEMUX is used. For example, if the Number of Optical links is 20, an 8-wavelength and a 16- wavelength MUX/DEMUX are used. Such a subsystem would require two optical fibers (one for each MUX/DEMUX pair. In such a case, the subsystem RF performance parameters that are calculated and shown are based on the higher order (16 in this case) MUX/DEMUX pair. There is a subsystem RF performance difference between the two, as the optical insertion loss is different between the 4-, 8-, and 16-wavelength MUX/DEMUX pairs. 19 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Fiber Amplifier (EDFA) Settings If the optical losses within the fiberoptic link are high enough to consider optical amplification, an erbiumdoped fiber amplifier (EDFA) option is provided. The saturated optical output power of the EDFA may be selected from the dropdown list. No EDFA, +14 dbm, +17 dbm, +20 dbm, and +23 dbm options are generally available. An L-Band EDFA implementation is shown in Figure 17. For L-Band, amplification is only available for 1550 nm and DWDM transmitters. When an EDFA option is selected, the block diagram at the top of the page adds this EDFA module. In the example below, the +23 dbm optical output power option is not provided, as this optical power would result in overloading the fiberoptic receiver. Figure 17. Optical Amplifier (EDFA) Option Setting The EDFA option works in the same way for Satcom and Wideband Microwave fiberoptic links. As all Satcom and Wideband Microwave transmitters are 1550 nm or DWDM, the EDFA option is available for all Satcom and Wideband Microwave fiberoptic links. 20 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
There exists also the option for placing an EDFA (EDFA pre-amplifier) preceding the fiberoptic receiver. An example is shown in Figure 18. The activation of the EDFA pre-amplifier option is dependent on the optical power level at this point in the fiberoptic link. If an EDFA at the transmitter side of the fiberoptic link is providing sufficient power at the input to the fiberoptic receiver, the EDFA pre-amplifier option will not be available. Therefore, in order to have the EDFA pre-amplifier option, it may be necessary to reduce the optical output power of the EDFA at the transmitter (or remove it altogether). Figure 18. Optical Pre-Amplifier (EDFA Pre-Amp) Option Setting Again, the EDFA pre-amplifier option is only available in fiberoptic links that are 1550 nm or DWDM. 21 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Equipment Configuration Paramters The following figures describe the equipment settings required to determine equipment part numbers. These settings do not affect subsystem RF performance. L-Band subsystem equipment configuration settings are shown in Figure 19. Figure 19. L-Band Equipment Parameter Settings Depending on the selection of fiberoptic transmitter and RF connector interface, the L-Band subsystem may have slightly different RF passbands. The RF passband for the particular configuration is provided in one of the notes below the bar graphs. 22 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The RF interface at the input and output of the fiberoptic subsystem (L-Band) may be selected from the following. 50Ω SMA (f) 50Ω BNC (f) 75Ω BNC (f) The Optiva platform provides the option of remote management and control via a plug-in management and control module. The M&C module provides an SNMP (Ethernet) interface for each chassis that houses a module. For Optiva 3RU 16-slot chassis, the M&C module would occupy one of the 16 card slots. For the 1RU 6-slot chassis, the M&C module would occupy a dedicated slot on the back of the equipment chassis, and would not consume one of the 6 available slots. If the M&C option is selected, a module will be added for each required equipment chassis. The 19 Rack Mounted option provides the following options. Front Access Rear Access No 16-slot and 6-slot chassis may be configured such that plug-in modules are accessed from the front or rear of a 19 equipment rack. If the option No is chosen, the subsystem will be configured using small flange mounted 1-, or 2-slot enclosures. If the subsystem requires more than 2 plug-in modules, the Parts List will default to a 19 rack mounted configuration. The Optiva 3RU 19 chassis provides slots for two (dual redundant) power supplies. Two power supplies per 3RU chassis is recommended, however it is optional. The 1RU 6-slot chassis has integrated swappable dual redundant power supplies as a baseline configuration. The Power Cord option provides the means to select the power cord connector for the AC/DC power supplies in the 3RU and 1RU chassis. The available options are shown below. North America European Union United Kingdom 23 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The Satcom Band additional equipment settings are shown in Figure 20. The RF interface at the input and output of the fiberoptic subsystem may be selected from the following. 50Ω SMA (f) 50Ω K (f) The K connectors are generally used for the higher RF frequency fiberoptic links. Optical connectors may be chosen from the following. SC/APC FC/APC E2000/APC Figure 20. Satcom Band Equipment Parameter Settings 24 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The Wideband Microwave Band additional equipment settings are shown in Figure 21. The RF and optical connector options are the same as the Satcom Band options. The upper end of the wideband passband is determined from the dropdown list on the left of the application window, as shown previously. The lower RF rolloff frequency may be selected as shown in Figure 21. Valid lower rolloff frequency options are as follows. 1000 MHz 500 MHz 100 MHz 50 MHz The RF output of the fiberoptic subsystem may be either AC- or DC-coupled. Figure 21. Wideband Microwave Band Equipment Parameter Settings 25 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Computed Outputs Signal Independent Performance Given the selected fiberoptic transmitter/receiver options, variable RF pre- and post-amplifier gain settings, and fiber link characteristics, the Design Tool computes estimates of the fiberoptic subsystem performance. The basic fiberoptic link RF performance metrics are shown in Figure 22. Figure 22. Computed Fiberoptic Subsystem RF Performance Link Gain RF subsystem link gain (db) is computed taking into account the RF amplifier gain settings, the conversion efficiencies of the laser diode and photodiode, and fiber passive and dispersive losses. 26 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Noise Figure The computed Noise Figure represents the cascaded noise figures of all noise contributors in the fiberoptic subsystem. Spur Free Dynamic Range (SFDR) SFDR is the level where the power of the intermodulation distortion (IMD) products are equal to the fiberoptic subsystem noise floor. Therefore, the input signals are adjusted such that the difference between the desired output signal power and the noise floor would be equal to the difference between the desired signals and the spurs. Figure 23 shows a graphical representation of the SFDR. Figure 23. Spur Free Dynamic Range The SFDR can be calculated from the output IP3 as follows. SFDR =2/3(OIP3 N F ), where N F is the noise floor SFDR (2-tone) SFDR (2-tone) is a measure of SFDR with total integrated noise within the signal bandwidth. 27 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
1 db Dynamic Range 1dB Dynamic Range is the range between the minimum detectable signal (fiberoptic subsystem noise floor), and the fiberoptic subsystem input 1dB compression point, as shown in Figure 24. Figure 24. 1dB Dynamic Range 1dB Dynamic Range can be calculated as follows. 1dB DR = P 1dB (dbm) N F (dbm/hz), where P 1dB is the input 1dB compression point Input IP3 Input IP3 represents an expression of subsystem Output IP3 referred to the subsystem input. Input IP3 may be calculated as follows. IIP3 (dbm) = OIP3 G, where G is the link gain of the subsystem 28 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Input 1dB Compression The Input 1dB Compression point (P1dB) is the input power level at which the subsystem gain drops by 1 db from its linear small signal value as shown in Figure 25. Figure 25. Input 1dB Compression Point 29 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Output IP3 Output IP3 is a measure of subsystem nonlinearity resulting from inputting two tones of equal power and observing the the difference in power between an output fundamental tone and the power of one of the output third order products. A graphical depiction of Output IP3 is shown in Figure 26. Figure 26. Output IP3 Output IP3 may be calculated as follows. OIP3 (dbm) = 0.5(3P O P O3 ), where P O = power of output fundamental tone and P O3 = power of a 3 rd order product. Output 1dB Compression The Output 1dB Compression point (P OUT,1dB ) is the output power level at which the subsystem gain drops by 1 db from its linear small signal value. Output 1dB Compression may be calculated as follows. P OUT,1dB (dbm) = P IN,1dB + (G 1), where P IN,1dB is the input 1dB compression point and G is the link gain of the subsystem. 30 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Signal Dependent Performance Signal power levels within the fiberoptic subsystem are shown in Figure 27. Figure 27. RF and Optical Signal Levels Within Fiberoptic Subsystem RF Input Power The total subsystem RF input power is the sum of input powers of all RF signal carriers. RF Output Power Total RF output power is total input power attenuated (or amplified) by the RF gain of the fiberoptic subsystem. 31 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Fiberoptic Receiver Input Optical Power The receiver optical input power level is the fiberoptic transmitter optical output power attenuated by the passive and fiber losses within the fiber portion of the fiberoptic subsystem. It is generally desired to maximize the optical input power to the fiberoptic receiver as doing so improves the fiberoptic receiver noise performance. The fiberoptic subsystem carrier-to-noise and carrier-to-interferer computed values are as shown in Figure 28. Figure 28. Fiberoptic Subsystem C/N and C/I 32 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Subsystem Carrier-to-Noise Carrier-to-noise (C/N) is computed using the per carrier RF Signal Power and Channel Bandwidth (noise bandwidth). C/N is the ratio of the carrier signal power to the integrated noise within the noise bandwidth. Increasing the carrier RF power improves C/N. Decreasing the subsystem noise figure (by increasing RF amplifier gain, etc.) improves C/N. Decreasing noise bandwidth improves C/N. Subsystem Carrier-to-Interferer Carrier-to-interferer (C/I) is computed using the per carrier RF Signal Power and the Number of RF Carriers. C/I is the ratio of the carrier signal power to the intermodulation products produced by the nonlinearities of the fiberoptic subsystem. Increasing the carrier RF power (and/or the number of RF carriers) degrades C/I as the total RF input power approaches the input 1dB Compression point of the fiberoptic subsystem. Increasing the subsystem input 1dB compression and IP3 levels (by decreasing RF amplifier gain, etc.) improves C/I. 33 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Parts List and Messages Parts List For the given fiberoptic subsystem configuration, a Parts List is generated. This list includes all fiberoptic transmitter and receiver modules required to satisfy the current configuration. This list also includes required chassis, power supplies, M&C modules, CWDM/DWDM mux/demux modules, EDFAs, chassis blank front covers (to populate unused chassis slots), and fiber jumpers to connect colocated CWDM/DWDM modules, EDFAs, and transmitter/receiver modules within a 19 rack. An example Parts List is shown in Figure 29. Figure 29. Fiberoptic Subsystem Parts List 34 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Special Messages The Design Tool provides a brief listing of context dependent messages as shown in Figure 30. Figure 30. Design Tool Special Messages 35 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Subsystem Block Diagram For the given fiberoptic subsystem configuration, a simple block diagram is provided as shown in Figure 31. Figure 31. Fiberoptic Subsystem Block Diagram Optical passive and dispersive (fiber) losses are depicted within the optical link. The fiberoptic transmitter block is updated to reflect whether the transmitter laser diode is directly modulated (L-Band) or externally modulated (Satcom, Wideband Microwave). Any required EDFAs and MUX/DEMUX modules are included. If more than one size of MUX/DEMUX module is required within the subsystem, the larger is depicted in the block diagram. Note that the block diagram depicts a single optical fiber link. For example, if the Number of Optical Links is 4, the subsystem would consist of 4 of the links shown in the block diagram. For CWDM/DWDM subsystems, only one of the transmitter/receiver pairs is shown in the block diagram. 36 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Saving Configurations Fiberoptic subsystem configurations may be saved for use at a later time. In order to save a configuration, click the Save Configuration button. A text box will appear. Type a name for the configuration and press Enter. The Save Configuration controls are shown in Figure 32. Figure 32. Saving Fiberoptic Subsystem Configuration 37 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
At this time, a unique configuration name must be entered. One cannot overwrite an existing configuration. If the new configuration name matches an existing name, please re-enter a new name as shown in Figure 33. Figure 33. Application Requires a Unique Configuration Name 38 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Retrieving Configurations Previously saved fiberoptic subsystem configurations may be recalled by clicking the Load Configuration button. If no saved configurations exist, a message is displayed as shown in Figure 34, and nothing happens. Figure 34. Loading Saved Configurations, No Configurations Exist 39 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
If only one configuration currently exists when Load Configuration is clicked, it is loaded and the message appears as shown in Figure 35. Figure 35. Loading Saved Configurations, One Configuration Exists 40 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
If more than one configuration currently exists when Load Configuration is clicked, a dropdown list including all saved configurations will appear as shown in Figure 36. The configurations are ordered such that the most recently saved are on the top. When Load Configuration is clicked, the top item in the list is automatically loaded. A particular configuration may be loaded by scrolling down the dropdown list and selecting it. Figure 36. Loading Saved Configurations, Multiple Configurations Exist 41 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Contact Us Feedback may be provided by clicking the Contact Us button as shown in Figure 37. Figure 37. Contact Us 42 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
The Contact Us form is shown in Figure 38. Enter an email address in the appropriate box. This will provide a means to send replies to an email address that may not be the same address associated in the User Profile. Enter any comments in the Comments box. If the inquiry involves a question/comment regarding a particular fiberoptic subsystem configuration, please reference that in the Comments. Such a configuration should have been previously saved, so that it can be retrieved. Click Send to send the message. After the message is sent, the application will return to the previous page. Figure 38. Contact Us Form 43 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Logout To exit the application, click the Finish button as shown in Figure 39. Figure 39. Exiting the Design Tool 44 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Click the Logout button, as shown in Figure 40, to logout from the RF Over Fiber Design Tool application. After clicking Logout, the RF Over Fiber Design Tool application Login window will be presented. One may close this tab on the browser. Figure 40. Exiting the Design Tool (continued) 45 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0
Document Revision History Initial Release 3/27/2015 46 Optiva RF-Over-Fiber Design Tool User Guide, Rev. 1.0