Laser wavelength control under direct modulation

Details Laser wavelength control under direct modulation Laser wavelength control under direct modulation

1997-07-22

1999-02-23

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 27, 362 32, G02B 634

Patent

active

058752730

ABSTRACT:
In accordance with the present invention, an in-fiber Bragg grating is coupled to the output of a directly modulated DFB laser. The output of the DFB laser is spectrally broadened, but has peak optical power at the channel wavelength. Typically, the grating is designed to have a substantially vertical "edge", i.e., segment of the transmissivity vs. wavelength characteristic, at a particular wavelength, between a transmission minimum and a transmission maximum. Amounts of light transmitted through and reflected by the grating are compared to adjust the channel wavelength to a desired wavelength at or near the edge of the grating.

REFERENCES:
patent: 5077816 (1991-12-01), Glomb et al.
patent: 5299212 (1994-03-01), Koch et al.
patent: 5696859 (1997-12-01), Onaka et al.
McCadams et al., CLEO'97, Paper CThW6, pp. 447-448, No Month.
Woodward et al., IEEE Photonics Technology Letters, vol. 5, No. 6, Jun. 1993, pp. 628-630.
Lee et al., CLEO'95, Paper Ctu10, pp. 93-94, No Month.
Morton et al., OFC'96 Technical Digest, Paper TuH6, pp. 39-40, No Month.

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