Product category:
Lasers
News Release from: MRC Components | Subject: QDI WSL laser module
Edited by the Electronicstalk Editorial
Team on 03 June 2003
DFB laser module plays a fine tune
The QDI WSL laser module is an internally cooled InGaAsP phase-shifted distributed-feedback laser array designed for 1500nm applications.
The QDI WSL laser module is an internally cooled InGaAsP phase-shifted distributed-feedback (DFB) laser array designed for 1500nm applications The laser module is available in CW version and is tunable over 40 adjacent ITU wavelengths at 50GHz
This article was originally published on Electronicstalk on 29 Jan 2003 at 8.00am (UK)
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Because of its stable wavelength, linewidth and wider tuning capability, it is suitable for WDM and instrumentation applications.
The laser module is fabricated in a 32-pin, hermetic, metal/ceramic butterfly electro-optical package.
The laser module is packaged with single-mode polarisation maintaining (PM) fibre pigtail and FC/APC connector.
The module contains an internal optical isolator that suppresses optical back reflection to the laser chip.
Light reflected back to the laser chip is attenuated at a minimum of 30dB at 25C.
Internal InGaAs PIN photodiodes can be used in conjunction with external circuitry to control the bias current applied to the laser and amplifier for consistent output power of the laser chip.
An integrated thermoelectric cooler (TEC) provides stable thermal characteristics.
The laser TEC allows for both heating and cooling of the laser chip and thermal tuning of the laser chip wavelength by changing temperature from between -10 and +40C.
The laser chip temperature is monitored by an internal precision thermistor (laser thermistor), which can be used with the laser TEC and external circuitry to control the laser chip temperature.
Selection of a particular DFB laser of the array enables coarse-tuning of the wavelength.
Fine-tuning between different wavelengths within one DFB laser is accomplished by TEC temperature setting.
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