1988-09-27
1990-08-07
Lee, John D.
350 9618, 350 9630, G02B 618
Patent
active
049462393
ABSTRACT:
An optical isolator for improving the isolation between an optical source and a transmission link in an optical communications system. The optical isolator comprises a tapered lens including a core region and surrounding cladding material. The core region can be fabricated from graded or step index glass and the cladding can be fabricated from glass or polymer material. The core region can also be fabricated from graded or step index polymer material with the cladding fabricated from polymer material. An opaque disk of carbon-filled epoxy is deposited on the large diameter end of the optical isolator to further enhance isolation.
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Bludau and Rossberg, "Low-Loss Laser-to-Fiber Coupling with Negligible Optical Feedback", Journal of Lightwave Technology, vol. LT-3, No. 2, pp. 294-302, Apr. 1985.
Kawano et al., "A New Confocal Combination Lens Method for a Laser-Diode Module Using a Single-Mode Fiber", Journal of Lightwave Technology, vol. LT-3, No. 4, pp. 739-745, Aug., 1985.
Sugie and Saruwatari, "Distributed Feedback Laser Diode (DFB-LD) to Single-Mode Fiber Coupling Module with Optical Isolator for High Bit Rate Modulation", Journal of Lightwave Technology, vol. LT-4, No. 2, pp. 236-245, Feb., 1986.
Georgia Tech Research Corporation
Heartney Phan T.
Lee John D.
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