Data
sheet
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Thinking optical solutions
www.bookham.com
Thinking optical solutions
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 photo-diode
Hermetically sealed 14-pin
butterfly package with optical
isolator
Applications
CWDM metro
2.5 Gb/s CWDM
Buried Het Laser
80Km reach
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 Technology 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.
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
A
Monitor diode bias
-10
V
Heatpump voltage
2.4
V
Fibre bend radius
30
mm
Parameter
Conditions
Min
Typ
Max
Unit
Threshold current (Ith)
10
22
mA
Slope efficiency by product
2 mW
0.04
0.09
3 mW
0.06
0.13
mW/mA
4 mW
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)
p-4nm
p
p+4nm
nm
Dispersion penalty at 80 km
(3)
2
dB
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
A
Monitor dark current
100
nA
Thermistor resistance
10
k
Heatpump current
T = 70C
250
600
900
mA
Heatpump voltage
T = 70C
1.0
2.4
V
Change of
p with laser temp.
20 to 35
0.09
nm/C
Parameters
(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
Where So = 0.092 ps/(nm
2
.km) and
= 1302 nm
(4)
Measurements determined from 20 - 80% pk - pk
)
.
/(
)
(
4
)
(
3
4
0
km
nm
ps
So
D
-
=
Absolute Maximum Ratings
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Thinking optical solutions
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Thinking optical solutions
Outline Drawing and Pinout Information
Dimensions in mm
PIN 1
1.52
30
26.040.08
20.83
14 PINS x 0.50.08
8.9
12.7
12.7
MIN
2.79
ON 2.54 PITCH
17.8
10.5
5
9.92
4.12
4 HOLES 2.6
36 MAX
NOSE CONE BOOT
HYTREL SECONDARY COATED
DIMENSIONS IN MILLIMETRES
TOLERANCES UNLESS
OTHERWISE SPECIFIED:
X.XX = 0.25
X.XXX = 0.127
MAX
5.46
Figure 1: Outline Drawing and Pinout Information
Reliability/Quality
Meets Qualification requirements of Telcordia / Bellcore GR468-Core for central office environment.
Operating reliability <500 FITs
1
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.
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.
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Thinking optical solutions
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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
1
Thermistor
2
Thermistor
3
Laser DC bias (-)
4
Monitor Anode (-)
5
Monitor Cathode (+)
6
TEC (+)
7
TEC (-)
8
Case Ground
9
Case Ground
10
Not Connected
11
Case Ground
12
Laser Modulation (-)
13
Case Ground
14
Not Connected
Connections
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Thinking optical solutions
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Thinking optical solutions
Device Ordering Information
LC25WC
[Wavelength] [Power Option]
[Reach]
[Connector]
****
E = 2 mWpk
G = 80 km
C28 = SC/PC
C = 3 mWpk
C34 = FC/PC
A = 4 mWpk
C57 = LC
B = 10 mWpk
C59 = 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-C28 is a 4 mW 1530nm device with an SC connector
for use in an 80 km application.
THIS PRODUCT COMPLIES WITH 21 CFR 1040.10
INVISIBLE LASER RADIATION
DO NOT VIEW DIRECTLY
WITH OPTICAL INSTRUMENTS
CLASS 1M LASER
DANGER
INVISIBLE LASER RADIATION
AVOID DIRECT
EXPOSURE TO BEAM
OUTPUT POWER 15 mW
WAVELENGTH >1466 nm
CLASS IIIb LASER PRODUCT
CAUTION
STATIC SENSITIVE DEVICE
OBSERVE PRECAUTIONS
Certificate No. FM 15040
Certificate No. EMS 35100
REFERENCE IEC 60825-1: Edition 1.2
www.bookham.com
REV 1 Feb 2003
Bookham Technology 2003 Bookham & ASOC are registered trademarks of Bookham Technology plc
North America
Bookham Technology Inc.
49 Buford Highway
Suwanee
GA 30024
USA
Tel: +1 678 482 4021
Fax: +1 678 482 4022
Europe
Bookham Technology plc
Brixham Road
Paignton
Devon
TQ4 7BE
UK
Tel: +44 (0) 1803 66 2875
Fax: +44 (0) 1803 66 2801
Asia
Bookham Technology plc
21/F Cityplaza One
1111 King's Road
Quarry Bay
Hong Kong
Tel: +852 (2100) 2249
Fax: +852 (2100) 2585
Sales@bookham.com
Important Notice
Bookham Technology has a policy of
continuous improvement, as a result
certain parameters detailed on this flyer
may be subject to change without notice.
If you are interested in a particular product
please request the available from any
Bookham Technology sales representative.
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