PowerSource TM. Tunable High Power CW Laser Module with Integrated Wavelength Monitoring 1935 TLI. Principle and Setup CONTENTS DESCRIPTION STANDARDS
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1 1935 TLI Principle and Setup This application note describes how to implement the PowerSource TM 1935 TLI laser module in order to get the highest performance during its use. For a long life time operation, it is highly recommended to operate this device below the absolute maximum ratings and to closely follow the handling precautions indicated in this note. This application note is valid for C and L-Band. CONTENTS Description...1 Standards...1 Absolute Maximum Ratings...2 Pin Allocation...2 Pin Description...2 Handling Precautions...3 Principle of Wavelength Monitoring an Principle of Tunability...3 Monitoring Section Characteristics...4 Electronic Control Loop...5 Case Temperature Compensation...5 Conclusion...6 DESCRIPTION The PowerSource TM 1935 TLI contains a SLMQW DFB laser and is designed for use with external modulation. This module is designed for high power DWDM applications with between-channel spacing down to 50 GHz without using an external locker. The module integrates a wavelength monitoring function in order to allow wavelength stabilization over product lifetime. Wavelength tuning over 8 different wavelengths is offered which makes inventory reduction possible, lowering cost. The module also incorporates a polarization maintaining fiber pigtail, thermoelectric cooler, precision thermistor, and optical isolator for stable operation under all conditions. STANDARDS Compliant with ITU-T G.691 and G.692 Optical fiber according to ITU-T G.652 Environment according to IEC 68-2 and MIL STD 883 Qualification according to GR-468-CORE Safety class 3A according to IEC-825 Safety class 3B according to FDA/CDRH 21 CFR 1040 (n ) AN001TRAN02/04 1
2 ABSOLUTE MAXIMUM RATINGS Exposing the device to stresses above those listed in absolute maximum ratings could cause permanent damage. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Min Max Unit Storage Temperature ºC Operating Temperature for 10 mw and 20 mw Versions ºC Soldering Temperature (3s max) 350 ºC Axial Force on Fiber (10 s max) 5 N Fiber Bend Radius 30 mm EDS (1) Applied on PIN Detectors (pins 4, 5 and 10) 100 V EDS (1) on Other Pins 2000 V Laser Forward Current 400 ma Laser Reverse Voltage 2 V Photodiode Forward Current 1 ma Photodiode Reverse Voltage 20 V Thermistor Voltage 9 V Thermistor Current 250 µa TEC Voltage 5 V TEC Current 1.8 A Package Mounting Screw Torque 0.2 N.m (1) Human body model PIN ALLOCATION Pin Description 1 Thermistor 2 Thermistor 3 Laser Diode Cathode DC Bias (-) 4 Power Monitoring PD Anode (-) 5 Common Power Monitoring and Wavelength Monitoring PD Cathodes (+) 6 TE Cooler (+) 7 TE Cooler (-) 8 Case Ground 9 Case Ground 10 Wavelength Monitoring PD Anode (-) 11 Laser Diode Anode (+) 12 Laser Diode Cathode (-) 13 Laser Diode Anode (+) 14 No Connection PIN DESCRIPTION Figure 1. Electrical Pin Description (Top View) AN001TRAN02/04 2
3 HANDLING PRECAUTIONS The component described in this specification is sensitive to electrostatic discharges and should not be handled except at a static free workstation. Take precautions to prevent ESD. Use wrist straps, grounded work surfaces and recognized anti-static techniques when handling the PowerSource TM 1935 TLI module. Care should be taken to avoid supply of transient and over voltage. Over voltage or current above the maximum specified in absolute maximum ratings may cause permanent damage to the device. Take appropriate precautions to prevent undue exposure to naked eye. Handle the laser module by its package only, never hold it by leads or pigtail. For package mounting the following procedure should be carefully followed: In order to achieve the ultimate thermal performance of the device, thermal paste should be added on the support. Assure that the mounting screws do not touch the PowerSource TM 1935 LMI optical tube and are in contact with the base plate of the laser before tightening. Tighten the screw up to 0.2 N.m - Do not exceed this maximum mounting torque. Assure that the leads are aligned and in contact with appropriate contact pads before soldering the device leads and before biasing the device. To clean the optical interface of the module switch off the laser and use a dry optical wipe and proper compressed air (never use abrasive wipe). Isopropyl alcohol should be used; clean the optical face by making a figure "8" then take a dry wipe and repeat. Follow with compressed air or nitogen. PRINCIPLE OF WAVELENGTH MONITORING & PRINCIPLE OF TUNABILITY The PowerSource TM 1935 TLI is a limited-band tunable laser module in which tunability is achieved by adjusting the laser submount temperature. The module covers up to eight adjacent channels of the 50 GHz ITU grid. Each ITU wavelength of the PowerSource TM 1935 TLI is characterized by its ratio (ERT) and its Filter Slope (FS) (as shown in the Monitoring section characteristics). The principle of wavelength monitoring is described on Figure 2. Two photodiodes are used: The first (PD1), referenced as a power monitoring photodiode, gives a signal (I P ) which is proportional to the laser optical power and independent of the wavelength. This allows the emitted optical power to be monitored. The second (PD2), referenced as wavelength monitoring photodiode, gives a signal (I λ ) which depends on both optical power and emitted wavelength. This allows the emitted wavelength to be locked to determined values. As usual with external wavelength lockers, photodiode currents are used to create an error signal, which is used in the wavelength monitoring loop. Figure 2. Principle of the integrated wavelength monitoring. As shown in Figure 3, a typical error signal is given by (G 2 I λ /G 1 I P ) where G 1 and G 2 are the amplification gains of the two photodiode amplifiers (see Electronic control loop scheme shown on Figure 5). The advantage of a comparison between G 2 I λ and G 1 I P is that it gives a locking point independent of power, which allows the use of the laser module in the Automatic Current Control (ACC) mode. The error signal (G 2 I λ /G 1 I P ) can be used as well. AN001TRAN02/04 3
4 Figure 3. Locking points and error signal generated from the wavelength monitor. Error signal cancellation is achieved through laser chip temperature control: If G 2 I λ - G 1 I P > 0 the laser chip has to be heated up to increase emitted wavelength. If G 2 I λ - G 1 I P < 0 the laser chip has to be cooled down to decrease emitted wavelength. The dispersive element used in Avanex wavelength monitors is an air-gap Fabry- Perot etalon. It has two main advantages in comparison with other dispersive elements: 1. The optical transmission is periodic. This means that by matching the Free Spectral Range (FSR) of the etalon to the ITU-T wavelength grid, many wavelengths are addressed by the same wavelength monitor. So this monitor is able to follow the evolution of the laser modules that will address more wavelengths (see PowerSource TM 1935 TLI data sheets). 2. The thermal dependence of the air-gap etalon is very small. Since the electrical output of the wavelength monitoring photodiode is periodic with wavelength, great care must be taken concerning the definition of the capture range to ensure that the locked wavelength will be the right one. The Capture Range (CR) is limited by the FSR of the etalon (see Figure 4). Maximum value of CR is 46.5 GHz (~360 pm) in the case of a 50GHz spacing grid (7 % margin). Figure 4. Definition of the main parameters used in wavelength monitoring. At the start of the wavelength locking loop, the emitted wavelength must be within the capture range. The wavelength deviation of the laser diode due to aging has to be taken into account in the definition of the actual boundaries of the effective CR. These boundaries are defined by two temperatures θ1 and θ2. The control loop has to be checked so that the current temperature is between θ1 and θ2 before starting the wavelength locking loop procedure. It should be noted that due to the asymmetrical wavelength aging of the laser in the Automatic Power Control (APC) mode, the locked wavelength will be found on a negative slope of the wavelength monitoring photodiode output. The positioning tolerance of the ITU-T wavelength with respect to the center of the slope is ±20 pm. The ratio between the photodiode currents at the ITU-T wavelength is defined as the Electrical Responsivity Ratio (ERT). It is in the range [0.5; 3]. MONITORING SECTION CHARACTERISTICS The electro-optical characteristics of the wavelength monitoring section are given in the following table. Parameters Sym Min Max Unit Power Monitor Photodiode Slope Efficiency SI PDmon A/W Filter Photodiode Slope Efficiency SI PDfilt A/W Photodiodes Dark Current I dark 0.1 µa Central Wavelength 2 λ c ITU-T Grid (C+L-Band) Wavelength Accuracy 1 λ c ±2.5 GHz Wavelength Capture Range CR GHz Wavelength Deviation Between Adjacent ITU-T Channels ε λ 0.1 GHz Filter Slope 3 FS nm -1 Electrical Responsivity Ratio 4 ERT Central Wavelength Drift with Case Temperature 5 dλ c dtcase 0.3 pm/ C 1 Over lifetime and case temperature with wavelength monitoring GHz spacing. Ι Ι 3 Filter slope is defined as FS = λ+ λ Ι λ λ with Dl = 0.02 nm. Ι This slope is always negative λ 2 λ 4. The electrical responsivity ratio is the ratio of the photodiodes currents at ITU-T wavelengths. 5. The FP etalon is cooled by the internal Peltier thermoelectric cooler; PowerSource 1935 TLI in Automatic Wavelength Control mode (AWC). TM AN001TRAN02/04 4
5 ELECTRONIC CONTROL LOOP The general principle for the electronic control loop is shown on Figure 5. Gains G1 and G2 of the photodiode amplifiers allow accurate tuning of the locked wavelength to the targeted ITU-T wavelength. Two loops are used for the wavelength locking operation: The first is a classical temperature loop, which moves the emitted wavelength inside the capture range using the information issued from the temperature sensor. The second, activated when the wavelength reaches the capture range, operates the fine tuning of the wavelength using the error signal. A conditional test (a window comparator can be used in an analogic electronic circuit) is made to switch between these two loops. Figure 5. Principle of the wavelength monitoring electronic control loop. Temperature set point is the thermistor reference value when the wavelength is initially set on the laser module. 1 and 2 are the minimum and maximum thermistor values allowed to stay within the wavelength monitoring capture range. CASE TEMPERATURE COMPENSATION For each channel, the wavelength divergence of the PowerSource TM 1935 TLI is composed of two parts: 1. The wavelength stability during life product: ±10 pm du to Fabry-Perot Etalon stability. 2. The wavelength stability due to operation conditions: ±20 pm due mainly to the case temperature range [0; 70 C]. The PowerSource TM 1935 TLI wavelength stability can be improved by compensating for case temperature effects. The following figure gives an illustration of the phenomena: The change of the case temperature involves a small wavelength change (ε coming from λ/ Tcase = 0.3 pm/ C max) when the PowerSource TM 1935 TLI is in locked mode (with constant ERT). So, if the system reads the exact Figure 6. Principle of the wavelength monitoring verrsus case temperature. case temperature, an electronic loop can compensate for the wavelength deviation; the calculation of a new ratio (ERT) allows an accurate tuning of the locked wavelength to the targeted ITU-T wavelength. To compensate for the case temperature effect, a thermistor reference can be set on the board to monitor the PowerSource TM 1935 TLI case temperature. By measuring three ERT at three different case temperatures (0, 25 and 70 C for example) for each channel, the case temperature effects can be compensated by using one of the following calculation algorithms: 1. Three points linear regression R(Tcase) = Rtcase0 + P x (Tcase - Tcase0) 2. Second order interpolation (Lagrange) R(Tcase) = Rtcase0 + P x (Tcase - Tcase0) + P' x (Tcase - Tcase0) 2 3. Two curves interpolation R(Tcase) = Rtcase0 + P x (Tcase - Tcase0) for Tcase < Tcase0 R(Tcase) = Rtcase0 + P x (Tcase - Tcase0) for Tcase > Tcase0 AN001TRAN02/04 5
6 Technical results obtained with one PowerSource TM 1935 TLI in the [0, 70 C] case temperature range are given in the following table: Optical Frequency ITU Wavelength (nm) Wavelength Stability Wavelength Stability Wavelength Stability Wavelength Stability (THz) without Tcase with Tcase with Tcase with Tcase Compensation Compensation Compensation 2nd Compensation Two Linear Regression Order Interpolation Curves Interpolation /+8 pm -1/+2 pm -2/0 pm -1/0 pm /+8 pm 0/+1 pm 0/+1 pm 0/+1 pm /+10 pm -1/+2 pm -1/+1 pm -1/+1 pm /+10 pm -1/+3 pm -1/+2 pm 0/+3 pm /+10 pm 0/+1 pm 0/+1 pm 0/+1 pm /+8 pm 0/+1 pm 0/+1 pm 0/+1 pm /+10 pm 0/+3 pm 0/+3 pm 0/+3 pm /+10 pm 0/+1 pm 0/+1 pm 0/+1 pm *The stability given in this table is due to operation conditions. CONCLUSION With this application note describing principle and setup of the PowerSource TM 1935 TLI, the user should now be in position to design the interface and to optimize its performance for a wide variety of digital system applications. The case temperature compensation allows it to reduce the wavelength divergence due to operating conditions from ± 10 pm to ± 3 pm in the case temperature range [0; 70 C]. PowerSource TM 1935 TLI C Band Nominal Power Connector Type Part Number 10 mw FC/PC 3CN ## 20 mw FC/PC 3CN ## ## defines the wavelength and the connector according table defined in the PowerSource TM 1935 TLI C Band datasheet. PowerSource TM 1935 TLI L Band Nominal Power Connector Type Part Number 10 mw FC/PC 3CN ## 20 mw FC/PC 3CN ## ## defines the wavelength and the connector according table defined in the PowerSource TM 1935 TLI L Band datsheet. Performance figures contained in this document must be specifically confirmed in writing by Avanex before they become applicable to any particular order or contract. Avanex reserves the right to make changes to the products or information contained herein without notice. For additional information, contact your Avanex Account Manager or request information on our website: http// Nasdaq: AVNX Encyclopedia Circle, Fremont, CA USA Telephone Fax AN001TRAN02/ Avanex Corporation. Actual data will vary according to the specific product and the specific application. 6
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