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Data Sheet
2.5 Gb/s CWDM Buried Het Laser 80Km reach LC25WC
This laser module provides a fast route to CWDM by providing a drop in replacement on existing TDM or WDM circuit packs with minimum redesign and verification work. The product employs the Bookham strained layer MQW Buried Heterostructure DFB laser chip, and has been designed specifically for use in Coarse Wavelength Division Multiplexed (CWDM) 2.5 Gb/s optical fibre trunk systems. The device is packaged in a hermetic 14-pin butterfly package incorporating an isolator and monitor photodiode for control of the power of the laser over life and all operating conditions. The device is available with a number of power options depending on application and link span requirements. Features: * Drop in replacement onto TDM and WDM card * 2.5 Gb/s operation * Up to 10mW optical output power available * Narrow spectral line-width * Internal TEC with precision NTC thermistor for temperature control * 1470nm to 1610nm at 20nm compliant to ITU G.694.2 * Code reduction with single product for reaches up to 80km * GaInAsP SLMQW DFB single frequency laser chip * InGaAs monitor photodiode * Hermetically sealed 14-pin butterfly package with optical isolator * RoHS compliant
Applications: * CWDM metro
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Data Sheet
Parameters
Parameter Threshold current (Ith) Slope efficiency by product 2 mW 3 mW 4 mW 10 mW
[1]
Conditions
Min
Typ 10
Max 22 0.09 0.13 0.17 0.43 -10
Unit mA mW/mA
0.04 0.06 0.08 0.143
RF input reflection coef (S11) Forward voltage Channel wavelengths available Peak wavelength for channel Dispersion penalty at 80 km Time averaged spectral linewidth Side-mode suppression Optical rise/fall time Monitor photo current Monitor dark current Thermistor resistance Heatpump current Heatpump voltage Change of p with laser temp.
dB V nm nm dB nm dB
1.3 ITU G.694.2
[2] [3]
1.8 1610 p+4nm 2 0.6
1470 p-4nm p 0.1 30 40
-20 dB
[4]
125 50 250 1200 100 10
ps A nA k
70C case temperature 70C case temperature 20 to 35
250
600 1.0 0.09
900 2.4
mA V nm/C
[1] 50 measurement system, f = dc - 3 GHz. [2] Submount temperature between 20C & 35C start of life to achieve required p. [3] Standard product dispersion penalty will be compliant to the specified link length of 80 km using an extinction ratio of 10 dB. Fibre dispersion characteristics are derived from the following equation
So D( ) = ( - 03 ) ps /(nm.km) 4
Where So = 0.092 ps/(nm2.km) and = 1302 nm. [4] Measurements determined from 20 - 80% pk - pk.
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Absolute Maximum Ratings
Parameter Case operating temperature Laser submount operating temperature Storage temperature Laser current above Ith Laser reverse voltage Laser reverse current Monitor diode bias Heatpump voltage Fiber bend radius 30 Min 0 20 -40 Max 70 35 85 100 1.0 10 -10 2.4 Unit C C C mA V A V V mm
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Data Sheet
Reliability/Quality
Meets Qualification requirements of Telcordia / Bellcore GR468-Core for central office environment. Operating reliability <500 FITs1 in 15 years. Reliability figures for other life conditions available upon request. 1- Assumes laser die submount held at <35C by internal thermoelectric cooler, mean forward current of 35 mA, and end of life limits based on 10 mA increase in Ith and 25 % change in laser efficiency. Safety Information Laser safety classifications:IEC60825-1: Edition 1.2 Class 1M 21CFR1040.10 Class IIIB Electrostatic discharge:ESD threshold >500V TA-TSY-000870 class 3.
Outline Drawing and Pinout Information
Dimensions (mm)
Figure 1: Outline Drawing and Pinout Information.
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Data Sheet
Instructions for Use - LC25WC
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 100 A 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 anode, Pin 5 Monitor cathode The back facet monitor provides a mean power reference for the laser and is normally operated with a 5 V reverse bias. 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 0.9 A at 2.4 V. Pin 8, 9, 11, 13 Case ground These pins must be grounded in all applications. Pin 10 This pin is not connected. It should be grounded if possible. Pin 12 Laser modulation (-) The data input (modulation current) is applied via this pin which is a nominal 25 Ohm impedance coplanar line. For 10mW applications the end of life modulation current is 90mA. 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.
Connections
Pin # 1 2 3 4 5 6 7 Function Thermistor Thermistor Laser DC bias (-) Monitor Anode (-) Monitor Cathode (+) TEC (+) TEC (-) Pin # 8 9 10 11 12 13 14 Function Case Ground Case Ground Not Connected Case Ground Laser Modulation (-) Case Ground Not Connected
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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.
[Power Option] [Reach] [Connector] E = 2 mWpk G = 80 km J28 = SC/PC C = 3 mWpk J34 = FC/PC A = 4 mWpk J57 = LC B = 10 mWpk J59 = MU *** = First three digits of wavelength value E.g. for p = 1530 nm *** = 153 Fibre length 1130 to 1190 mm. Other connector types are available on request. E.g. LC25WC153AG-J28 is a 4 mW 1530nm device with an SC connector for use in an 80 km application.
Ordering Information: LC25WC [Wavelength] ***
Contact Information
North America Bookham Worldwide Headquarters
2584 Junction Ave. San Jose CA 95134 USA * Tel: +1 408 919 1500 * Fax: +1 408 919 6083
Europe Paignton Office
Brixham Road Paignton Devon TQ4 7BE United Kingdom * Tel: +44 (0) 1803 66 2000 * Fax: +44 (0) 1803 66 2801
Asia Shenzhen Office
2 Phoenix Road Futian Free Trade Zone Shenzhen 518038 China * Tel: +86 755 33305888 * Fax: +86 755 33305805 +86 755 33305807
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 sales@bookham.com
DANGER
INVISIBLE LASER RADIATION DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS CLASS 1M LASER
REFERENCE IEC 60825-1: Edition 1.2
INVISIBLE LASER RADIATION AVOID DIRECT EXPOSURE TO BEAM OUTPUT POWER 15mW WAVELENGTH >1466nm CLASS IIIb LASER PRODUCT
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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.
BH13095 Rev 1.0 January 2007 (c)Bookham 2005. Bookham is a registered trademark of Bookham Inc.

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