BOOKHAM LC25WZBJ-J59

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
[1]
Forward voltage
1.3
Peak wavelength (λp)
[2]
Dispersion penalty
[3]
Time averaged spectral linewidth
1535.82
-20dB
0.1
Side-mode suppression
32
Optical rise/fall time
40
[4]
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
[1] 50Ω measurement system, f = dc - 3GHz.
[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 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.
[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
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
sales@bookham.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.