Fiber optical circulator

Details Fiber optical circulator Fiber optical circulator

2005-07-05

2005-07-05

Ullah, Akm Enayet (Department: 2874)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S494010, C385S011000

Reexamination Certificate

active

06914722

ABSTRACT:
A fiber optical circulator includes a first collimator and a second collimator sandwiching a circulator core therebetween. The first collimator and the second collimator respectively define Port1and Port2thereof, and the first collimator further defines Port3thereof. The circulator core includes a first crystal and a second crystal at two ends respectively confronting the first collimator and the second collimator aside. The circulator core further includes a first group of two half-wavelength waveplates and a first Faraday rotator, and second subassembly a second group of two half-wavelength waveplates and a second Faraday rotator. A third crystal is disposed between the first subassembly and the second subassembly wherein a backward light path from Port2to Port3passes the third crystal and is deflected by the third crystal toward the first collimator though total internal reflection.

REFERENCES:
patent: 5909310 (1999-06-01), Li et al.
patent: 6301045 (2001-10-01), Liu
patent: 05323233 (1993-12-01), None

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