Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1997-09-05
1998-05-26
Davie, James W.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 27, 372 50, H01S 319, H01S 310
Patent
active
057578400
ABSTRACT:
A semiconductor laser includes a distributed feedback semiconductor laser structure having a plurality of regions. The regions are electrically separated from each other. A phase shift section is provided in a grating in one of the regions. In the semiconductor laser, .alpha. parameters for transverse electric (TE) and transverse magnetic (TM) polarization modes, in the vicinity of threshold currents for the TE mode and the TM mode, are made different from each other. An .alpha. parameter is defined by 4.pi./.lambda..multidot.(dn/dN)/(dg/dN) where .lambda. is a Bragg wavelength, n is an effective refractive index, N is an injection carrier density and g is a gain for each of the TE mode and the TM mode.
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Canon Kabushiki Kaisha
Davie James W.
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