Wavelength locking device, beam collimating device, and optical

Details Wavelength locking device, beam collimating device, and optical Wavelength locking device, beam collimating device, and optical

1995-10-31

1997-11-04

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 33, 385 37, 385 29, 369109, 369 4412, G02B 626

Patent

active

056849001

ABSTRACT:
A waveguide layer is formed on a transparent substrate disposed to cross an optical axis perpendicularly, and on the waveguide layer, a concentric circular grating coupler is disposed so that the optical axis passes the center. A light beam radiated from a semiconductor laser passes through the transparent substrate and enters the waveguide layer. Light beams enter the respective positions of the grating coupler are excited and move from the periphery to the center, and the light beams pass through the center and become waveguide light beams. The waveguide light beam is the reverse wave of the waveguide light beam inputted at the transmittance position. Therefore, the radiant beam radiated from the grating coupler also becomes a reverse wave inputted at the irradiating position, and is accurately fed back to the semiconductor laser. The laser wavelength is locked since the radiant beam has wavelength selectivity.

REFERENCES:
patent: 5159650 (1992-10-01), Nishiwaki et al.
patent: 5495462 (1996-02-01), Nishiwaki et al.
"External cavity semiconductor laser with a Fourier grating and an aspheric lens", Hiroyuki Asakura et al., Applied Optics, vol. 32, No. 12, 20 Apr. 1993, pp. 2031-2038.

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