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LC25ET Datasheet(PDF) 4 Page - Bookham, Inc.

Part No. LC25ET
Description  2.5 Gb/s Buried Het 4x100GHz Tunable Laser with Etalon Stabilisation and extended reach option
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Maker  BOOKHAM [Bookham, Inc.]
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LC25ET Datasheet(HTML) 4 Page - Bookham, Inc.

   
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Data Sheet
4
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 +10 Monitor anodes, Pin 5 Monitor cathode
Monitor diodes are arranged in the package such that they give an equal monitor current when the laser wavelength is
matched to the ITU grid. A reverse bias must be applied equally across each of the monitors, this is commonly
achieved by applying 10 V to Pin 5.
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 1.0 A at 2.4 V.
Pin 8, 9, 11, 13 Case ground
These pins must be grounded in all applications.
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 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.
Instructions for use – LC25ET
Pin #
Function
Pin #
Function
1
Thermistor
8
Case ground
2
Thermistor
9
Case ground
3
Laser DC bias (-)
10
Monitor long anode (-)
4
Monitor short anode (-)
11
Laser case ground
5
Monitor cathode (+)
12
Laser modulation (-)
6
TEC (+)
13
Laser case ground
7
TEC (-)
14
N/C
Connections
Figure 2: Schematic Diagram.


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