Optical waveguides – With optical coupler – Particular coupling structure
Patent
1998-08-21
2000-05-23
Ngo, Hung N.
Optical waveguides
With optical coupler
Particular coupling structure
385 88, 385147, 385 90, 385 91, G02B 636
Patent
active
060673931
ABSTRACT:
A light generating apparatus includes: a submount; a semiconductor laser chip mounted on the surmount; a substrate which is mounted on the submount and includes an optical waveguide; and a substance having a predetermined thickness which is disposed between the semiconductor laser chip and the substrate. In an oscillation wavelength stabilizing apparatus for a light source, the light source is a semiconductor laser which includes: an active region for providing gain; and a distributed Bragg reflection (DBR) region for controlling an oscillation wavelength. The apparatus includes a control section which monotonously varies, in a first direction, a DBR current to be input to the DBR region while detecting the oscillation wavelength of an output light of the semiconductor laser so as to detect a DBR current value I.sub.0 corresponding to a predetermined wavelength value, and then monotonously varies the DBR current in a second direction which is opposite the first direction beyond the detected value I.sub.0, and then monotonously varies the DBR current in the first direction again to set the DBR current at the detected value I.sub.0, thereby fixing the oscillation wavelength of the semiconductor laser chip at the predetermined wavelength value.
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Kato Makoto
Kitaoka Yasuo
Mizuuchi Kiminori
Nishiuchi Ken'ichi
Uno Tomoaki
Matsushita Electric - Industrial Co., Ltd.
Ngo Hung N.
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