Feedback-free optical arrangement for converting polarized laser

Details Feedback-free optical arrangement for converting polarized laser Feedback-free optical arrangement for converting polarized laser

1987-12-23

1990-10-30

Arnold, Bruce Y.

350 9613, 350379, G02F 109

Patent

active

049664441

ABSTRACT:
An arrangement for converting diverging polarized laser emission from a semiconductor laser into a convergent beam includes two optical lenses and an optical isolator formed of a Faraday rotator and at least one polarizer arranged in the beam path of the laser emission. The lens which lies farther from the semiconductor layer is a component of the Faraday rotator and is formed by a plano-convex lens having an curved side facing the semiconductor laser.

REFERENCES:
English abstract of JP, A, 57-173992, (10-26-82).
Shirasaki, M., et al., "Compact Optical Isolator for Fibers Using Birefringent Wedges," Applied Optics, vol. 21, No. 23, Dec. 1, 1982, pp. 4296-429.
Chikama, et al., "Distributed-Feedback Laser Diode Module with a Novel and Compact Optical Isolator for Gigabit Optical Transmission Systems", paper ME4, Conference on Optical Fiber Communications (OFC).
Sakano et al., "1.5 m DFB-LD Module with Optical Isolator", Conference on Optical Fiber Communications (OFC), 1985, San Diego, CA, paper PD 13-1, 1985.
Sugie et al., "Distributed Feedback Laser Diode (DFB-LD) to Single Mode Fiber Coupling Module with Optical Isolator for High Bit Rate Modulation", Journal of Lightwave Tech. vol. LT-4, No. 2, Feb. 1986.
Sugie et al., "An Effective Nonreciprocal Circuit for Semiconductor Laser-to-Optical-Fiber Coupling Using A YIG Sphere", Journal of Lightwave Tech, vol. LT-1, No. 1, Mar. 1983.
Peterman, "Noise and Distortion Characteristics of Semiconductor Lasers in Optical Fiber Communication Systems", IEEE Journal of Quantum Electronics, vol. QE-18, No. 4, Apr. 1982.
Agrawal, "Effect of Fiber-far-End Reflections on Intensity and Phase Noise in InGaAsP, Semiconductor Lasers", Appl. Phys. Lett. 45(6), Sep. 15, 1984.

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