HDO772 C-BAND DWDM FIBRE TRANSMITTER

Transcription

1 Timo Rantanen (6) HDO772 C-BAND DWDM FIBRE TRANSMITTER HDO772 is a high performance directly modulated C-band DWDM transmitter for forward path fibre optic links in CATV and FTTx networks. HDO772 is able to carry analog loading up to 550 MHz and digital channels can be inserted on the whole frequency scale. HDO772 contains an electrical dispersion compensator that is important especially when analog channels are transmitted to longer distances. HDO772 is installed into HDX installation frame and the transmitter is available on different optical wavelengths in accordance with the ITU wavelength grid. The optical output power is adjustable that enables the equalising of channel power in multiwavelength cases when optical amplifiers are utilised. HDO772 has two equal input sections with level and slope adjustments to support broadcast and narrowcast signal distribution. The RF isolation between the input branches is high minimising the leakage of narrowcast signals into unwanted narrowcast node segments. The power consumption is low but HDO772 still offers the high performance and the widest variety of features. Features ITU wavelengths Optical output power adjustment for channel power equalising Electrical dispersion compensator provides a good CSO performance at longer transmission distances Standardised input and test point levels First-class power consumption vs. signal performance rate Two inputs with level adjustments Equaliser in both inputs High isolation between inputs Unused input can be switched off for power saving and noise reduction Drive amplifier can be set to power save mode in narrowcast load conditions Integrated input amplifiers and laser driver amplifiers Automatic power control providing constant total OMI as standard feature Optional integrated xwdm filter to combine forward and return paths into one fibre or to combine various forward wavelengths into one fibre Optional spectrum analyser function Fibre connectors can be located at the rear or at the front panel Small form factor family, 2 RU height Local and remote software control of all adjustments Forced cooling through the unit

2 Timo Rantanen (6) Management features Technical specifications Monitoring of APC (Automatic Power Control) functionality with user configurable offset Optical output power adjustment and monitoring Laser bias current monitoring TEC (Thermo-Electric Cooler) current monitoring Laser temperature monitoring Signal level adjustment in both inputs Slope adjustment in both inputs Input 2 switch on/off Drive amplifier power save mode on/off Link length setting LED indicators for signal and module statuses Internal temperature measurement and monitoring Intelligent fan speed control with monitoring Non-volatile logging of 32 latest events, including alarms, alarming values, settings changes and application starts. Uptime and total uptime counters All adjustments and alarm limits fully user configurable Local PC connection through backplane HDO bus with DVX021 cable Remote IP connection through HDC100 controller module SNMP monitoring and configuration through HDC100 controller module Parameter Specification Note Optical parameters Light source Cooled DFB with optical isolator Peak wavelength nm (ITU ch ) 1) Output power, nominal value +10 m 2) Relative intensity noise -154 c/hz 3) OMI per channel 4 % 4) Link length setting km Pass band of optional xwdm filter 5) Pass channel ±0.12 nm (DWDM) or ±6.5 nm (CWDM) Reflect channel, DWDM nm except the pass channel Reflect channel, CWDM nm except the pass channel Number of optical ports 1 or 2 RF parameters Frequency range MHz RF impedance 75 Ω Input return loss 18 6) Flatness ±0.4 7) Automatic power control (APC) Yes 8) Laser test point level for 4.5 % OMI 78 µv 9) Input level 77 µv 10) Level adjustment range 10 Equaliser adjustment range 0 6 Isolation between inputs 50 11)

3 Timo Rantanen (6) Spectrum analyser module (optional) Measurement range MHz, 0.25 MHz steps Measurement bandwidth 1.5 MHz 12) Dynamic range µv 13) Measurement accuracy ±1 14) Noise and distortion performance Link C/N, 0 m to optical receiver 53 15) CTB 65 16) CSO 60 16) General Power consumption 10 (8) W 17) Supply voltages 25 V / 330 ma (245 ma) 17) 6.3 V / 300 ma (300 ma) 17) RF connectors F female 18) Optical connector SC/APC, E ) Cooling Field replaceable fan 20) Dimensions 2U x 7HP x 380 mm h x w x d Occupies 1/12 of HDX installation frame Weight 1.5 kg EMC compliance EN ) Enclosure classification IP20 Operating temperature range C Storage temperature range C Operating relative humidity 0 85 %

4 Timo Rantanen (6) Notes 1) ITU channels 59, 58, 57,..., 21. Total number available 39 wavelengths. See the configuration map. 2) User can adjust the output power in the window +10 m...+8 m. The selected OMI value is retained over the adjustment range. 3) Worst case value at the nominal output power. 4) Typical value of an analog channel when the total channel loading is 50 analog channels and 30 QAM256 channels. 5) DWDM filter is used if the return path is based on DWDM. CWDM filter is used if the return path is based on CWDM. xwdm filter decreases the output power 0.5 typically. 6) Typical value is 18 on the whole frequency band. The minimum value is 18 and above 40 MHz -1 / octave. 7) Typical value. Maximum value is ± ) APC is based on broadband detection in which the total laser driving power is measured and adjusted so that if the RF power is evenly divided into all channels 4 % OMI/ channel is achieved. The offset can be set by a user. 9) Typical accuracy is ±0.4. Maximum value is ± ) Input level required to reach 4.5 % OMI with adjustments in 0 positions. 4.0 % OMI equals to 1 lower level. 11) The attenuation from one input to the other input. Above 860 MHz the isolation is more than ) Typical -3 bandwidth. Typical -20 bandwidth is 2.5 MHz. 13) Level at laser (OMI) test point for modulated PAL signal. For QAM detection the dynamic range is approx. 6 higher. Nominal level denotes 4 % OMI. ( % OMI range) 14) This is the typical performance over band MHz for PAL signals. For PAL signals between MHz and all QAM signals the accuracy is ± ) Typical value with 10 km fibre and with nominal output power. The minimum value is 4 % OMI. 16) Typical value with 10 km fibre and with 50 analog channels up to 550 MHz and 30 QAM256 channels above 550 MHz. The longer fibre increases CSO, for example at 25 km CSO is typically 2 lower. For analog channels the maximum link length is 25 km depending on channel count, channel allocation and requirements. 17) Typical power consumption at 25 C without the spectrum analyser module. 8 W value is valid when the drive amplifier power save is active. The power save mode is proposed when the limited amount of narrowcast channels (20 pcs.) are transmitted. The spectrum analyser consumes 2 W. 18) Fixed connections are located at the rear panel. Test points are located at the front panel. 19) Fibre connectors can be located at the rear or at the front panel. 20) The fan can be replaced by the user without signal interruption. 21) Radiation limit is 20 pw.

5 Timo Rantanen (6) Block diagrams, with and without WDM filter (optional) Spectrum Analyser Optonal Broadband Detector Laser TP Input 1 E O Output 15xx nm Input 2 Spectrum Analyser Optonal Broadband Detector Laser TP Input 1 Input 2 E O US output or Input 15yy nm Output 15xx nm US input

6 Timo Rantanen (6) Ordering information HDO772 configuration map HDO Transmitter type 3-1 Fibre location A Broadcast F Front panel B Narrowcast R Rear panel 2-1 ITU ch and wavelength 4-1 Optopassive 21 ITU Ch nm F21 ITU21 filter, front 22 ITU Ch nm R21 ITU21 filter, rear 23 ITU Ch nm F22 ITU22 filter, front 24 ITU Ch nm R22 ITU22 filter, rear 25 ITU Ch nm 26 ITU Ch nm 27 ITU Ch nm 28 ITU Ch nm 29 ITU Ch nm F59 ITU59 filter, front 30 ITU Ch nm R59 ITU59 filter, rear 31 ITU Ch nm FC nm filter, front 32 ITU Ch nm RC nm filter, rear 33 ITU Ch nm FC nm filter, front 34 ITU Ch nm RC nm filter, rear 35 ITU Ch nm FXX None 36 ITU Ch nm RXX None 37 ITU Ch nm 38 ITU Ch nm 5-1 Fibre connector type 39 ITU Ch nm A1 SC/APC, 9 deg. 40 ITU Ch nm B1 FC/APC 41 ITU Ch nm C1 E2000/APC 42 ITU Ch nm D1 SC/APC 8 deg. 43 ITU Ch nm H1 SC/APC 8 deg. with shutter 44 ITU Ch nm A2 2xSC/APC 9 deg. 45 ITU Ch nm B2 2xFC/APC 46 ITU Ch nm C2 2xE2000/APC 47 ITU Ch nm D2 2xSC/APC 8 deg. 48 ITU Ch nm H2 2xSC/APC 8 deg. with shutter 49 ITU Ch nm 50 ITU Ch nm 6-1 Signal monitoring 51 ITU Ch nm A Spectrum analyser 52 ITU Ch nm X None 53 ITU Ch nm 54 ITU Ch nm DOC00xxxxx, Rev ITU Ch nm 56 ITU Ch nm 57 ITU Ch nm 58 ITU Ch nm 59 ITU Ch nm