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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average dielectric constant ),(avgyx corresponds to the waveguide structure shown below in which the grating region has been replaced by a layer with a z-averaged dielectric constant. InP InP z=0 z=LInGaAsP waveguide InGaAsP/InP grating region a InP InP z=0 z=LInGaAsP InGaAsP/InP grating region replaced by a layer with a z-averaged dielectric constant Semiconductor Optoelectronics (Farhan Rana, Cornell University) The z-average of the part ),,(zyx is therefore zero.

Lasers 13.1 Distributed Feedback (DFB) Gratings in Waveguides 13.1.1 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

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