Title: Optical communications systems

Abstract: Energy propagating in a dielectric optical waveguide may be transferred from one mode of propagation to another by inducing a spatially undulatory variation in refractive index in the core of the dielectric optical waveguide. Such a variation may be induced by an electro-static field. The electro-static field may be directed either longitudinally of, or transversely of the dielectric optical waveguide. A suitably periodic electro-static field may be generated by positioning a suitable electrode structure about the dielectric optical waveguide. For certain applications it may be desirable to arrange for the spatial period of the electro-static field to vary in a random manner. By arranging for propagating modes to couple to non-propagating modes an optical modulator may be produced.

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Inventors: Dyott, Richard Burnaby (London, EN)
Stevenson, John Leslie (London, EN)

Application Number: 567429
Filing Date: 1975-04-11
Publication_date: 1976-05-18
Assignee: The Post Office (London, EN)
Primary Class(es): 385/40 385/28, 385/30, 385/37, 385/125, 385/143
Other Classes:
US Patent Ref:

3531185	Oct, 1967	Buchsbaum et al.	350/179.
3666348	May, 1972	Marcatili	350/96.
3723921	Mar, 1973	Rowe et al.	350/96.
3764195	Oct, 1973	Blank et al.	350/96.
3770339	Nov, 1973	Ramaswamy	350/96.

Other Refs:
Primary Examiner: Corbin, John K.
Assistant Examiner: Levy, Stewart
Attorney: Kemon, Palmer & Estabrook