Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1991-12-16
1993-04-20
Lerner, Martin
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359282, 359484, 359495, 359496, G02F 109, G02B 2728
Patent
active
052047717
ABSTRACT:
The optical circulator according to the present invention comprises three birefringent crystal plates 22, 23, and 24; reciprocal and non-reciprocal rotators 25 of the first group inserted between birefringent crystal plates 22 and 23; reciprocal and non-reciprocal rotators 26 of the second group inserted between birefringent crystal plates 23 and 24; and more than two beam incoming and outgoing ports 27, 28, and 29. The rotating directions of the reciprocal and non-reciprocal rotators 25 of the first group are so set that the directions in which ordinary beam and extraordinary beam are separated on the birefringent crystal plates differ among birefringent crystal plate 23 and birefringent crystal plates 22 and 24, and the electric field vibration directions of the beams agree at birefringent crystal plate 23. The rotating directions of the reciprocal and non-reciprocal rotators 26 of the second group are set so that the polarization face of the beams are perpendicular to each other at birefringent crystal plate 24. According to the above optical circulator, there is no need to use angular prisms or polarization beam splitters as have been required till now.
REFERENCES:
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patent: 4650289 (1987-03-01), Kuwahara
patent: 4988170 (1991-01-01), Buhrer
patent: 4991938 (1991-02-01), Buhrer et al.
T. Matsumoto et al, "Polarization-independent optical circulator: an experiment," Applied Optics, vol. 19, No. 1, Jan. 1, 1980, pp. 108-112.
M. Koga et al, "Multi/Demultiplexer Using a 4-port Optical Circulator and Interference Filters," The Transactions of the IEICE, vol. E72, No. 10, Oct., 1989, pp. 1086-1088.
Lerner Martin
Nippon Telegraph and Telephone Corporation
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