Design of optical circulators

K. Roger Lee; Steve Lin; Chien-Hsiung Chiu; Jing-Yuan Lin

doi:10.1117/12.312867

19 June 1998 Design of optical circulators

K. Roger Lee, Steve Lin, Chien-Hsiung Chiu, Jing-Yuan Lin

Proceedings Volume 3420, Optical Fiber Communication; (1998) https://doi.org/10.1117/12.312867
Event: Asia Pacific Symposium on Optoelectronics '98, 1998, Taipei, Taiwan

Abstract

A high-isolation polarization-insensitive optical circulator being reduced in size nd low polarization mode dispersion is disclosed. A transparent optical circulator comprises a first birefringent crystal, a first pari of Faraday polarization rotators having two Faraday polarization rotators aligned in parallel with the propagation direction of an optical signal, a second birefringent crystal, a second pair of Faraday polarization rotators similar to the first pair of Faraday polarization rotators, and a third birefringent crystal. The optical circulator with the reflector and the Faraday rotator together reduce the total size of the circulator, and improve the polarization mode dispersion. The insertion loss is under 1 dB and the polarization dependent loss is under 0.2 dB with change in a polarization state. A novel optical circulator configuration that doesn't employ any polarization beam-splitters (PBS) is introduced. Birefringent crystals are used instead of PBS to achieve a high-isolation polarization-insensitive optical circulator. The isolation of the innovated optical circulator is more than 65 dB at 1550 nm wavelength. Details on the design, fabrication, and characteristics of the circulator are presented.

Citation Download Citation

K. Roger Lee, Steve Lin, Chien-Hsiung Chiu, and Jing-Yuan Lin "Design of optical circulators", Proc. SPIE 3420, Optical Fiber Communication, (19 June 1998); https://doi.org/10.1117/12.312867

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