Multi-level architecture for optical time delays in integrated c

Details Multi-level architecture for optical time delays in integrated c Multi-level architecture for optical time delays in integrated c

1995-06-07

1998-12-29

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling structure

385 14, 385 15, 385 40, G02B 626, G02B 612

Patent

active

058548661

ABSTRACT:
The present invention provides a method and a circuit for increasing a time delay in an optical signal in an integrated optoelectronic circuit without a proportionate increase in the circuit area. The method uses multiple layers of optical waveguide fabricated in a vertical hierarchy in combination with concentric circular paths. The different sections of the optical waveguide delay line 103, 107 on the multiple layers are connected by electro-optic couplers to pass the optical signal between the sections. In a preferred embodiment, the optical couplers 105, 108 are a poled Electro-Optic (EO) region of cladding 506 allowing the coupler to be electrically addressed. Alternatively, in another embodiment, the couplers 105, 108 may be fabricated with a polymer that is optically nonlinear 406. This type of coupler could be addressed, or activated, by an optical signal, or a component of the optical signal traveling through the coupler.

REFERENCES:
patent: 3995311 (1976-11-01), Taylor
patent: 5159699 (1992-10-01), De Monts
patent: 5222162 (1993-06-01), Yap et al.
patent: 5367584 (1994-11-01), Ghezzo et al.
patent: 5394239 (1995-02-01), Valette
patent: 5465310 (1995-11-01), Kersten et al.
patent: 5481633 (1996-01-01), Mayer

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