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LC25TBBJ28 Datasheet(PDF) 4 Page - Bookham, Inc. |
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LC25TBBJ28 Datasheet(HTML) 4 Page - Bookham, Inc. |
4 / 8 page 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 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 for the LC25T product and 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 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 – LC25T Pin # Function Pin # Function 1 Thermistor 8 Case ground 2 Thermistor 9 Case ground 3 Laser DC bias (-) 10 N/C 4 Monitor 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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