Distributed feedback laser
First Claim
1. A distributed feedback (DFB) laser having a semiconductor body including a periodic structure formed to modulate the optical propagation constant of laser light propagating within the laser, the semiconductive body having an outer surface and including at least three electrodes on said surface, one of said electrodes comprising a counter-electrode and the remaining electrodes comprising an electrode structure, said electrodes being arranged such that by control of the relative current flow through said electrodes the injected current profile, in the region of modulated optical propagation constant produced by said periodic structure, is adjustable to vary the frequency of the laser output independently of its optical amplitude.
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Abstract
A distributed feedback (DFB) laser having a divided electrode structure on one surface by means of which the injected current distribution in the laser may be modified so as to enable independent control of laser output amplitude and wavelength.
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Citations
8 Claims
- 1. A distributed feedback (DFB) laser having a semiconductor body including a periodic structure formed to modulate the optical propagation constant of laser light propagating within the laser, the semiconductive body having an outer surface and including at least three electrodes on said surface, one of said electrodes comprising a counter-electrode and the remaining electrodes comprising an electrode structure, said electrodes being arranged such that by control of the relative current flow through said electrodes the injected current profile, in the region of modulated optical propagation constant produced by said periodic structure, is adjustable to vary the frequency of the laser output independently of its optical amplitude.
Specification