Optical filter

Details Optical filter Optical filter

2005-12-06

2005-12-06

Lee, John D. (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

C398S048000, C398S085000, C385S027000

Reexamination Certificate

active

06973240

ABSTRACT:
An optical filter comprises a multimode waveguide, and first and second coupling waveguides which communicate with the multimode waveguide at respective ends thereof. Filtering is achieved by the effect of self-imaging in the multimode waveguide. The filter further comprises one or more series of aperture within the multimode waveguide, the or each series being located at a longitudinal position within the multimode waveguide at which 1-to-N way intensity division of an input optical field occurs, the optical field being the lowest order transverse mode of the coupling waveguides. The (one or more) series of apertures reduces the transmission of the filter at wavelength other than those corresponding to transmission peaks of filter's transmission function, thus providing improved filtering performance compared to prior art optical filters based on self-imaging.

REFERENCES:
patent: 4693544 (1987-09-01), Yamasaki et al.
patent: 5410625 (1995-04-01), Jenkins et al.
patent: 5640474 (1997-06-01), Tayag
patent: 5862288 (1999-01-01), Tayag et al.
patent: 58-068713 (1983-04-01), None
Jenkins et al. “Waveguide Beam Splitters and Recombiners Based on Multimode Propagation Phenomena”,Optics Letters, pp. 991-993 (1992).
Banerji et al. “Laser Resonators with Self-Imaging Waveguides”,J. Opt. Soc. Am B., pp. 2378-2380 (1997).

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