Data Sheet
1
This laser module provides a fast route to CWDM by providing
adrop 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
2.5 Gb/s CWDM Buried Het Laser 80Km reach
LC25WC
Data Sheet
2
Parameters
Parameter Conditions Min Typ Max Unit
Threshold current (Ith) 10 22 mA
Slope efficiency by product 2 mW 0.04 0.09
3mW 0.06 0.13 mW/mA
4mW 0.08 0.17
10 mW 0.143 0.43
RF input reflection coef (S11)[1] -10 dB
Forward voltage 1.3 1.8 V
Channel wavelengths available ITU G.694.2 1470 1610 nm
Peak wavelength for channel [2] λp-4nm λpλp+4nm nm
Dispersion penalty at 80 km [3] 2dB
Time averaged spectral linewidth -20 dB 0.1 0.6 nm
Side-mode suppression 30 40 dB
Optical rise/fall time [4] 125 ps
Monitor photo current 50 250 1200 µA
Monitor dark current 100 nA
Thermistor resistance 10 kΩ
Heatpump current 70°C case temperature 250 600 900 mA
Heatpump voltage 70°Ccase temperature 1.0 2.4 V
Change of λpwith laser temp. 20 to 35 0.09 nm/°C
[1] 50 Ωmeasurement system, f = dc - 3 GHz.
[2] Submount temperature between 20°C & 35°C start of life to achieve required λp.
[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
WhereSo = 0.092 ps/(nm2.km) and λ=1302 nm.
[4] 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 30 mm
)./()(
4
)(3
4
0kmnmps
So
D
λ
λ
λλ−=
Data Sheet
3
Outline Drawing and Pinout Information
Dimensions (mm)
Figure 1: Outline Drawing and Pinout Information.
Reliability/Quality
Meets Qualification requirements of Telcordia / Bellcore GR468-Core for central office environment.
Operating reliability <500 FITs1in 15 years. Reliability figures for other life conditions available upon request.
1- Assumes laser die submount held at <35°C 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.
Data Sheet
4
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 µA 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.
Pin # Function Pin # Function
1Thermistor 8 Case Ground
2Thermistor 9 Case Ground
3Laser DC bias (-) 10 Not Connected
4Monitor Anode (-) 11 Case Ground
5Monitor Cathode (+) 12 Laser Modulation (-)
6TEC (+) 13 Case Ground
7TEC (-) 14 Not Connected
Connections
Data Sheet
5BH13095 Rev 1.0 January 2007
©Bookham 2005. Bookham is a registered trademark of Bookham Inc.
Ordering Information:
LC25WC [Wavelength] [Power Option] [Reach] [Connector]
*** E=2mWpk G=80 km J28 = SC/PC
C=3mWpk J34 = FC/PC
A=4mWpk J57 = LC
B=10 mWpk J59 = MU
*** = First three digits of wavelength value E.g. for λp=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.
Important Notice
Performance figures, data and any illustrative material
provided in this data sheet aretypical 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
areavailable from any Bookham sales representative.
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
www.bookham.com
sales@bookham.com
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
2Phoenix Road
Futian Free Trade Zone
Shenzhen 518038
China
•Tel: +86 755 33305888
•Fax: +86 755 33305805
+86 755 33305807
REFERENCE IEC 60825-1: Edition 1.2
INVISIBLE LASER RADIATION
DO NOT VIEW DIRECTLYWITH
OPTICAL INSTRUMENTS
CLASS 1M LASER
DANGER
OUTPUT POWER 15mW
WAVELENGTH >1466nm
CLASS IIIb LASER PRODUCT
INVISIBLE LASER RADIATION
AVOID DIRECT
EXPOSURE TO BEAM
THIS PRODUCT COMPLIES
WITH 21 CFR 1040.10
Caution - use of controls or adjustments or
performance of procedures other than
those specified herein may result in
hazardous radiation exposure.
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.
ISO14001:1996
EMS 504193
TL9000 Rev 3.0 (ISO9001:2000)
FM15040
