1980-01-24
1981-06-16
Corbin, John K.
350355, G02B 514
Patent
active
042734118
ABSTRACT:
An optical TE.revreaction.TM mode converter, using highly birefringent materials such as lithium niobate, is wavelength sensitive and, as such, can be used as a wavelength filter. However, to extract the filtered (i.e., the mode converted) signal, a separate, high quality polarization selective element is required. This application discloses means for eliminating the need for a separate polarization sensing element by using mode conversion as a means for spatially separating the filtered signal. The filter comprises a pair of mismatched waveguides (11, 12), and phase matching means (14, 15) for producing selective coupling between TE mode wave energy in one of the guides and TM mode wave energy on the other guide.
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patent: 4146297 (1979-03-01), Alferness et al.
Yariv, "Coupled-Mode Theory For Guided-Wave Optics," IEEE J.Q.E., vol. QE-9, No. 9, Sep. 1973, pp. 919-933.
Lee et al., "Electrooptic Guided-To-Unguided Mode Converter," IEEE J.Q.E., vol. QE-12, No. 5, May 1976, pp. 273-281.
Alferness, "Optical Directional Couplers With Weighted Coupling," A.P.L., vol. 35, No. 3, Aug. 1979, pp. 260-262.
Alferness, "Efficient, Waveguide Electro-Optic TE.revreaction.TM Mode Converter/Wavelength Filter," Post Deadline Papers, Optical Commun. Conf., Amsterdam, Sep. 1979, pp. 19.6-1 to 19.6-4.
Bell Telephone Laboratories Incorporated
Corbin John K.
Lee John D.
Sherman Sylvan
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