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Thread: DFB vs DBR (or vs VCSEL vs other semiconductor lasers)

  1. #1
    Join Date
    Mar 2023
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    Default DFB vs DBR (or vs VCSEL vs other semiconductor lasers)

    Hi everyone!


    I’ve been reading into semiconductor lasers and came across DFB and DBR lasers and while I understand, superficially, the difference between them, I fail to find an application or necessity that would absolutely need a DBR laser and couldn’t be done with a DFB laser or VCSEL or other type of semiconductor laser.


    Anyone have some knowledge they’d like to share on this?


    Thank you!

  2. #2

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    DFB (Distributed Feedback) lasers are commonly used in fiber optic communications applications due to their narrow linewidth, high output power, and wavelength stability. They are also used in sensing applications such as gas sensing, strain sensing, and temperature sensing.


    An example of a specific application for DFB lasers is in wavelength-division multiplexing (WDM) systems used in fiber optic communication networks. In a WDM system, multiple signals are transmitted over a single fiber by using different wavelengths of light for each signal. DFB lasers are used to generate the different wavelengths of light needed for the WDM system.


    DBR (Distributed Bragg Reflector) lasers are often used in applications where precise control over the laser wavelength is required, such as in spectroscopy, sensing, and metrology. They are also used in applications requiring multiple wavelength outputs, such as in optical coherence tomography (OCT).


    An example of a specific application for DBR lasers is in gas sensing. In gas sensing applications, the absorption of light by specific gas molecules is used to detect the presence and concentration

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