Laser light source apparatus, OTDR apparatus, and optical commun

Details Laser light source apparatus, OTDR apparatus, and optical commun Laser light source apparatus, OTDR apparatus, and optical commun

1996-09-26

1998-06-23

Healy, Brian

Coherent light generators

Optical fiber laser

372 99, 372102, 385 12, 385 14, 385 37, 385 42, 359109, 359110, 359130, H01S 330, G02B 634, H04B 1008

Patent

active

057712506

ABSTRACT:
The pulse laser light source apparatus in the OTDR apparatus of present invention comprises an optical waveguide which receives and guides the light emitted from the first light-emitting end face, wherein the optical waveguide comprises a reflecting area which selectively reflects a part of light emitted from a light-emitting end face of a semiconductor light-emitting device, a core of the reflecting area comprises a first diffraction grating which is disposed in a first area and whose refractive index periodically changes along an optical-axis direction, the first diffraction grating selectively reflects, of the light emitted from the light-emitting end face of the semiconductor light-emitting device, a part of the light within a first wavelength range. And the diffraction grating is one of denvices which constitute a laser resonator.

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