Polarization-independent optical wavelength filter with simplifi

Details Polarization-independent optical wavelength filter with simplifi Polarization-independent optical wavelength filter with simplifi

1993-09-29

1995-02-07

Ullah, Akm E.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

385 4, 356350, 372 6, G02B 2714, G02B 600, G02B 610, H01S 330

Patent

active

053880013

ABSTRACT:
A polarization-independent optical wavelength filter uses a polarization splitter to divide an optical input signal into first and second signals with mutually perpendicular planes of polarization. The first signal propagates via a first optical path to a first end of an optical device, such as a TE-TM mode converter or a polarization-dependent filter, that acts selectively on the desired wavelength, then returns via a second optical path from a second end of the optical device to the polarization splitter. The second signal propagates via the second optical path to the second end of the same optical device, and returns from the first end via the first optical path to the polarization splitter. The polarization splitter recombines the returning signals into an optical output signal consisting only of the desired wavelength.

REFERENCES:
patent: 4273411 (1981-06-01), Alferness
patent: 4390236 (1983-06-01), Alferness
patent: 5090017 (1992-02-01), Mendenhall et al.
patent: 5230029 (1993-07-01), Mendenhall et al.
patent: 5327276 (1994-07-01), Shimosaka et al.
Cheung et al., "1 Gb/s System Performance of an Integrated, Polarization-Independent, Accoustically-Tunable Optical Filter", IEEE Photonics Technology Letters, vol., 2, No. 4, Apr. 1990, pp. 271-273.
Fukutoku et al., "Wavelength-Division-Multiplexing Add/Drop Multiplexer Employing A Novel Polarisation Independent Accusto-Optic Tunable Filter", Electronics Letters, vol. 29, No. 10, May 13, 1993, pp. 905-907.

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