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Home › Forums › GENERAL › TWDM › Reply To: TWDM

April 18, 2016 at 10:25 pm #38260
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Rajguru M. Mohan
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Hi,
And finally we have distributed Bragg reflector (DBR) laser.
A DBR laser is also a monolithic chip. The wavelength can be tuned by
controlling the refractive index of the semiconductor-based DBR.
Generally, the refractive index is changed by a carrier plasma effect induced by current injection.
Therefore, the tuning time is a short as a few nanoseconds.
Its drawback is that the linewidth is increased when the tuning current is injected.
However, it has been reported that a DBR-type laser with heaters for
temperature-based wavelength tuning has a narrow linewidth even during wavelength tuning.

The all benefits and some drawbacks of tunable lasers being discussed.

Thanks

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