Data Sheet 2.5Gb/s Buried Het Laser non-WDM applications LC25WZ This laser module employs the Bookham strained layer MQW Buried Heterostructure DFB laser chip, and has been designed specifically for use in 2.5Gb/s long distance single channel optical fiber systems. The device is packaged in a hermetically sealed 14-pin butterfly package incorporating an isolator and monitor photodiode for control of the power of the laser over life and all operating conditions. Features: • 2.5Gb/s operation • Narrow spectral line-width • Internal TEC with precision NTC thermistor for temperature control • Code reduction with single product for reaches up to 175km • GaInAsP SLMQW DFB single frequency laser chip • InGaAs monitor Photodiode • Hermetically sealed 14-pin butterfly package with optical isolator • RoHS compliant Applications: • TDM • On-off ramps • Long-Haul 1 Data Sheet Parameters Parameter Conditions Min Threshold current (Ith) Slope efficiency by product 2mW 3mW 4mW 10mW RF input reflection coef (S11) Typ Max Unit 10 22 mA 0.09 0.13 0.17 0.43 mW/mA -10 dB 1.8 V 1560.61 nm 2 dB 0.6 nm 0.04 0.06 0.08 0.143  Forward voltage 1.3 Peak wavelength (λp)  Dispersion penalty  Time averaged spectral linewidth 1535.82 -20dB 0.1 Side-mode suppression 32 Optical rise/fall time 40  Monitor photo current 50 250 Monitor dark current Thermistor resistance dB 125 ps 1200 µA 100 nA 10 Heatpump current 70°C case temperature Heatpump voltage 600 900 mA 70°C case temperature 1.0 2.4 V 20 to 35 0.09 Change of λp with laser temp. 250 kΩ nm/°C  50Ω measurement system, f = dc - 3GHz.  Submount temperature between 20°C & 35°C start of life to achieve required λp.  Standard product dispersion penalty will be compliant to the specified link length of 175km or 100km using an extinction ratio of 10dB. Fiber dispersion characteristics are derived from the following equation. 4 So λ D(λ ) = (λ − 03 ) ps /(nm.km) 4 λ Where So = 0.092ps/(nm2km) and λ = 1302nm.  Measurements determined from 20 - 80% pk - pk. Absolute Maximum Ratings Parameter Min Max Unit Case operating temperature 0 70 °C Laser submount operating temperature 20 35 °C Storage temperature -40 85 °C Laser current above Ith 100 mA Laser reverse voltage 1.0 V Laser reverse current 10 µA Monitor diode bias -10 V Heatpump voltage 2.4 V Fiber bend radius 2 30 mm Data Sheet Outline Drawing Dimensions (mm) Figure 1: Outline Drawing Reliability/Quality Meets Qualification requirements of Telcordia GR-468-CORE for Central Office environment. Operating reliability <500 FITs1 in 15 years. 1- Assumes laser die submount held at <35°C by internal thermoelectric cooler, mean forward current of 35mA, and end of life limits based on 10mA increase in Ith and 25% change in laser efficiency. FIT rate data for other end of life criteria, including minimum extinction ratio requirements, are available upon request. Instructions for Use – LC25WZ Pin 1 and Pin 2 Thermistor The thermistor is used in a control loop in conjunction with the thermo-electric cooler to maintain the laser submount temperature at the required value for wavelength. Operating current should be less than 100µA to prevent self-heating errors. Pin 3 Laser DC bias (-) Laser bias current (negative with respect to package ground) is applied via this pin which forms one side of the bias-T connection to the laser cathode. Pin 4 Monitor anodes, Pin 5 Common Monitor cathode The back facet monitor provides a mean power reference for the laser and is normally operated with a 5V reverse bias. 3 Data Sheet Pin 6 TEC (+), Pin 7 TEC (-) Applying a positive voltage on pin 6 with respect to pin 7 will cause the internal submount to be cooled relative to the case temperature. Reversing the polarity will raise the submount temperature relative to the case. The TEC supply should be capable of delivering up to 0.9A at 2.4V. Pin 8, 9, 11, 13 Case ground These pins must be grounded in all applications Pin 10 This pin is not connected and should be grounded if possible Pin 12 Laser modulation (-) The data input (modulation current) is applied via this pin which is a nominal 25Ω impedance coplanar line. For 10mW applications the end of life modulation current is 90mA maximum. For all other applications 60mA maximum modulation current should be provisioned. Pin 14 N/C This pin is not connected. It should be grounded if possible. Pin # Function Pin # Function 1 Thermistor 8 Case Ground 2 Thermistor 9 Case Ground 3 Laser DC bias (-) 10 Not Connected 4 Monitor Anode (-) 11 Case Ground 5 Monitor Cathode (+) 12 Laser Modulation (-) 6 TEC (+) 13 Case Ground 7 TEC (-) 14 Not Connected Safety Information Laser safety classifications: IEC 60825-1: Edition 1.2 Class 1M 21 CFR Ch.1 (4-1-97 Edition) Class IIIb Electrostatic discharge: ESD threshold >500V A-TSY-000870 class 3. 4 Data Sheet RoHS Compliance Bookham is fully committed to environment protection and sustainable development and has set in place a comprehensive program for removing polluting and hazardous substances from all of its products. The relevant evidence of RoHS compliance is held as part of our controlled documentation for each of our compliant products. RoHS compliance parts are available to order, please refer to the ordering information section for further details. Ordering Information: For Low Power, 175km versions LC25WZ [Power Option] E=2mW pk C=3mW pk A=4mW pk For 10mW version LC25WZB [Reach Option] J=100km A=175km A - [Connector] J28= SC/PC J34= FC/PC J57= LC J59= MU - [Connector] J28= SC/PC J34= FC/PC J57= LC J59= MU Fiber length 1130 to 1190mm E.g. LC25WZCA-J28 is a 3mW device with 175km reach and an SC connector. LC25WZBJ-J34 is a 10mW device with 100km reach and an SC/PC connector. Contact Information North America Bookham Worldwide Headquarters Europe Paignton Office Asia Shenzhen Office 2584 Junction Ave. San Jose CA 95134 USA Brixham Road Paignton Devon TQ4 7BE United Kingdom 2 Phoenix Road Futian Free Trade Zone Shenzhen 518038 China • Tel: +1 408 919 1500 • Tel: +44 (0) 1803 66 2000 • Fax: +1 408 919 6083 • Fax: +44 (0) 1803 66 2801 • Fax: +86 755 33305805 +86 755 33305807 • Tel: +86 755 33305888 Important Notice Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by Bookham before they become applicable to any particular order or contract. In accordance with the Bookham policy of continuous improvement specifications may change without notice. The publication of information in this data sheet does not imply freedom from patent or other protective rights of Bookham or others. Further details are available from any Bookham sales representative. www.bookham.com email@example.com DANGER INVISIBLE LASER RADIATION DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS CLASS 1M LASER REFERENCE IEC 60825-1: Edition 1.2 5 INVISIBLE LASER RADIATION AVOID DIRECT EXPOSURE TO BEAM OUTPUT POWER 21mW WAVELENGTH >1510nm CLASS IIIb LASER PRODUCT THIS PRODUCT COMPLIES WITH 21 CFR 1040.10 ISO14001:1996 EMS 504193 TL9000 Rev 3.0 (ISO9001:2000) FM15040 Caution - use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. BH13091 Rev 1.0 January 2007. ©Bookham 2006. Bookham is a registered trademark of Bookham Inc.