Coherent light generators – Particular active media – Semiconductor
Patent
1997-03-07
1999-08-10
Bovernick, Rodney
Coherent light generators
Particular active media
Semiconductor
372 26, 372 38, 359181, 359237, 359248, H01S 319, H04B 1004
Patent
active
059369922
ABSTRACT:
The present invention provides a method for selecting a semiconductor integrated optical modulator/laser light source device comprising a modulator section and a laser section. The method comprises the following steps. The laser section is supplied with a direct current which is equal to or larger than a threshold current for allowing the laser section to show a laser emission when the modulator section is supplied with a pulse signal for allowing the modulator section to show a pulse modulation so as to allow a light emitted directly from a facet of the laser section to show a transmission through a light wavelength dispersion medium within which the light on transmission shows a dispersion in wavelength. An intensity of the light having shown the dispersion in wavelength is measured to find a coefficient of variation in intensity of the light, wherein the variation is due to wavelength chirping. The device is selected based on a comparison of the coefficient of variation in intensity of the light to a predetermined reference level.
REFERENCES:
patent: 5394260 (1995-02-01), Suzuki et al.
patent: 5521738 (1996-05-01), Froberg et al.
patent: 5764670 (1998-06-01), Ouchi
Bovernick Rodney
NEC Corporation
Song Yisun
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