A buried heterostructure, multiple contact, distributed feedback (DFB) laser
has a grating periodicity of 1200 A and a waveguide index of refraction equal ˚
to 3.8. The interaction length of the grating is 500 μm. Assume that only a single mode oscillates and that feedback comes from a first-order Bragg reflection. In this problem you may neglect the slight shift in wavelength which
occurs in a DFB laser and assume that emission is at the Bragg wavelength.
(a) What is the emitted wavelength of the laser?
(b) If current is injected into the modulator section of the diode so as to
change the waveguide index by one part in 107, what will be the resulting
change in laser emitted wavelength (frequency)?
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