Wavelength selective optical devices using optical directional c

Details Wavelength selective optical devices using optical directional c Wavelength selective optical devices using optical directional c

1988-04-01

1990-02-13

Sikes, William L.

G02B 626, G02B 642

Patent

active

049001191

ABSTRACT:
New types of narrowband wavelength selective optical devices are described. Various configurations are possible, according to the invention, that perform as narrowband wavelength selective transmission or reflection filters or as narrowband wavelength selective optical taps or combiners. The optical devices of the invention include a 3 dB optical directional coupler and wavelength selecting elements such as Bragg reflection gratings or Fabry-Perot resonators usually positioned in optical symmetry with respect to the directional coupler. Two or more wavelength selecting elements can be used to obtain desired filtering characteristics.

REFERENCES:
Kawasaki et al.; "Narrow-Band Bragg Reflectors in Optical Fibers"; Optics Letters; vol. 3, p. 66, Aug. 1978.
K. O. Hill et al., "Photosensitivity in Optical Fiber . . . Fiber Fabrication", Appl. Phys. Lett., 32 (1), May 15, 1978.
K. O. Hill et al., "Narrow-Bandwidth Optical Waveguide Transmission Filters", Electronics Letters, vol. 23, No. 9, pp. 465-466, Apr. 23, 1987.
K. O. Hill, "New Design Concept for a . . . and Combiner", Electronics Letters, vol. 23, No. 13, pp. 668-669, Jun. 18, 1987.
Inoue et al., "Tunable Optical . . . Transmission System", Electronics Letters, vol. 21, No. 9, Apr. 25, 1985.
Stolen et al., "In-Line Fiber-Polarization-Rocking Rotator and Filter", Optics Letters, vol. 9, No. 7, Jul. 1984.
Matsuhara et al., "Optical-Waveguide Filters: Synthesis", J. of Opt. Soc. of America, vol. 65, No. 7, Jul. 1975.
Lissberger et al., "Narrowband Position-Tuned Multiplayer Interference Filter for Use in Single-Mode-Fibre Systems", Electronics Letters, vol. 21, No. 18, 1985.
Yataki et al., "All-Fibre Wavelength . . . Fused-Taper Coupler", Electronics Letters, vol. 21, No. 6, Mar. 14, 1985.

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