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Chapter 13 Distributed Feedback (DFB) Structures and ...

Semiconductor Optoelectronics (Farhan Rana, Cornell University) Chapter 13 Distributed Feedback (DFB) Structures and Semiconductor DFB Lasers Distributed Feedback (DFB) Gratings in Waveguides Introduction: Periodic Structures , like the DBR mirrors in VCSELs, can be also realized in a waveguide, as shown below in the case of a InGaAsP/InP waveguide. In the waveguide shown above, periodic grooves have been etched in the top surface of the InGaAsP waveguide before the growth of the top InP layer. Such periodic grating Structures are examples of one dimensional photonic bandgap materials. The relative dielectric constant is a function of the z-coordinate and can be written as, ),,(),(),,(avgzyxyxzyx The average dielectric constant ),(avgyx corresponds to the waveguide structure shown below in which the grating region has been replaced by a layer with a z-averaged dielectric const

The first zero in the reflection on either side of o determines the bandwidth over which the DBR mirror is an effective reflector. This bandwidth DBR is, 2 2 DBR 2 2 DBR 2 2 L v L g An infinitely long DFB structure is a one dimensional photonic bandgap material.

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