Community Forums - Reply To: Bidirectinal TWDM

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Free Evaluation

May 5, 2016 at 10:00 pm #38917

Spectator

We have lots of benefits of tunable laser. They are as: As tunable lasers are classified into three structural types: an external cavity laser, a distributed feedback (DFB) laser array, and a distributed Bragg reflector (DBR) laser. All of these laser structures provide a tuning range of more than 35 nm, which is required for DWDM systems. Another important aspect of the tunable lasers performance, when switching between wavelengths, is the wavelength stability of the device. As the laser tunes into its desired wavelength, there is a settling drift before the channel finally stabilizes. This drift can have a large impact on the performance of a dense wavelength division multiplexed system (causing adjacent channel interference) and therefore must be fully characterized, in terms of both the magnitude of the drift and the time it
takes to settle to the destination wavelength. The external cavity laser which can an easily provide a wide tuning range because optimum optical filters can be selected.This laser is a strong light source for digital coherent systems. Its drawbacks are that complex tuning control is needed to suppress mode hopping and that it has many optical parts.
Hope this information will be of some help
Regards

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