Optical head with an integrated isolator for coupling a semicond

Details Optical head with an integrated isolator for coupling a semicond Optical head with an integrated isolator for coupling a semicond

1989-12-11

1992-06-09

Gonzalez, Frank

Optical waveguides

With optical coupler

Input/output coupler

385 34, 385 49, G02B 632

Patent

active

051214512

ABSTRACT:
A DFB laser (2) is coupled to a monomode line fiber (14) via an isolator constituted by a Faraday rotator crystal (4) and a polarizing fiber (10) which is welded to a fiber to be coupled (14). A focusing lens (8) is integrated in an intermediate block including the rotator crystal (4) and a permanent magnet (6). The invention is particularly suitable for making light-emitting heads for use in optical fiber telecommunications systems.

REFERENCES:
patent: 4712866 (1987-12-01), Dyott
patent: 4770505 (1988-09-01), Okazaki
patent: 4867524 (1989-09-01), Courtney et al.
patent: 4893890 (1990-01-01), Lutes
patent: 4966444 (1990-10-01), Droegemuller et al.
Electronics Letters, vol. 23, No. 5, Feb. 26, 1987, pp. 203-205, Stevenage, Herts, GB; K. Matsuda et al.: "Low-noise LD module with an optical isolator using a highly Bi-substituted garnet film".
Electronics Letters, vol. 22, No. 19, Sep. 11, 1986, pp. 1020-1022, Stevenage, Herts, GB; L. LI et al.: "Broadband metal/glass single-mode fibre polarisers".
Journal of Lightwave Technology, vol. LT-4, No. 2, Feb. 1986, pp. 236-245, IEEE, New York, U.S.; T. Sugie et al.: "Disbributed feedback laser diode (DFB-LD) to single-mode fiber coupling module with optical isolator for high bit rate modulation".

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