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

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

Connections