Multi-wavelength channel transmission-type optical filter

Details Multi-wavelength channel transmission-type optical filter Multi-wavelength channel transmission-type optical filter

1998-08-11

2000-04-25

Ullah, Akm E.

Optical waveguides

With optical coupler

Plural

359179, G02B 628

Patent

active

060553456

ABSTRACT:
The present invention provides a multi-wavelength channel transmission-type optical filter that is capable of more narrowing the bandwidth of transmission wavelength in a transmission type optical filter using Mach-Zehnder interferometer. The multi-wavelength channel transmission-type optical filter including a first optical fiber coupler for dividing a broadband light source into two lights, an optical fiber length and optical fiber length controlling unit for controlling the gap of transmission wavelength in which each receives as inputs the above lights divided by the first optical fiber coupler, a second optical fiber coupler for outputting each of the above lights, which are passed through the optical fiber length controlling unit and the optical fiber length, and an optical isolator for narrowing the width of transmission wavelength by connecting the two outputs of the second optical fiber coupler, thereby improving a wavelength selecting characteristics.

REFERENCES:
patent: 4905243 (1990-02-01), Lokai et al.
patent: 5191586 (1993-03-01), Huber
patent: 5317660 (1994-05-01), Veith
patent: 5373515 (1998-12-01), Levine
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5926300 (1999-07-01), Mikakawa et al.
K. Inoue et al., Tunable optical multidemultiplexer for optical FDM transmission system, Apr. 25, 1985, pp. 387-389.
HG. Toba et al., 5GHZ-spaced, Eight-channel, Guided-wave tunable multi/demultiplexer for optical FDM transmission system, Jul. 16, 1987, pp. 788-789.

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