Optical: systems and elements – Polarization without modulation – Polarization using a time invariant electric – magnetic – or...
Patent
1996-09-13
1999-08-10
Nguyen, Thong
Optical: systems and elements
Polarization without modulation
Polarization using a time invariant electric, magnetic, or...
359495, 359502, 372703, 385 11, G02B 530, G02B 600
Patent
active
059367687
ABSTRACT:
An optical device of the invention having a first doubly refracting crystal plate of parallel plate type whose crystal optical axis is inclined in relation to the optical axis of an incident light, a second doubly refracting crystal plate of parallel plate type which is equal to the first doubly refracting crystal plate of parallel plate type in inclination of the crystal optical axis inclined in relation to the optical axis and in plate thickness, and a Faraday rotator which is disposed between the first and the second doubly refracting crystal plate of parallel plate type and. turns by 90 degrees an incident linear polarized light which is in the optical axis direction of the incident light and has wavelength of the incident light. The invention can provide a polarization-independent optical isolator which is small-sized and capable of selecting a direction of the input/output optical fiber at will. And the invention can compose an optical circulator capable of setting the number of input/output ports at will. The invention provides a polarization-independent optical isolator which is small-sized and capable of selecting directions of input/output optical fibers at will and an optical circulator which is small-sized and capable of setting the number of input/output ports at will.
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Masafumi Koga, et al., "Polarization-Insensitive High-Isolation Optical Nonreciprocal Device for Circulator Application", NTT Transmission Systems Laboratories, pp. 1-6.
Jr. John Juba
NEC Corporation
Nguyen Thong
LandOfFree
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