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LC25W4532AAJ57 Datasheet(PDF) 4 Page - Bookham, Inc. |
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LC25W4532AAJ57 Datasheet(HTML) 4 Page - Bookham, Inc. |
4 / 6 page Data Sheet 4 Instructions for use – LC25W****A/LC25EW****A 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. For Etalon stabilized devices the thermistor is used for the initial set up of the submount temperature at the required wavelength value. Operating current should be less than 100µA to prevent self-heating errors. Once the initial submount temperature has been achieved control of the TEC current is handed over to the Etalon locking circuit to achieve fine tuning. 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. For Etalon stabilized devices the 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 5V 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 0.9 A 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 for the LC25W product and it should be grounded if possible. For the Etalon locked product this pin is used for the monitor long anode. The monitor diodes are arranged 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 5V to pin 5. 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. |
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