Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1996-03-29
1997-09-23
Lee, John D.
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 40, G02F 101
Patent
active
056713029
ABSTRACT:
A plurality of optic modulators implemented using segmented electrodes and nonparallel waveguide structures are cascaded using optical couplers to provide a linearization of the overall electro-optic transfer function. Each of the optical modulators which are coupled in cascade have an electrode structure which is divided into a plurality of relatively small segments. The segments are connected via bond wires and transmission lines on an adjoining microwave circuit board. Each of the optical modulators includes a pair of waveguides which are sloped so as to result in a nonparallel waveguide structure which reduces acoustic effects, e.g., ripple. By using a plurality of small segments to implement the electrode structure a high degree of sensitivity is achieved as compared to when a single lengthy electrode structure is used. The combination of the non-parallel waveguides and a segmented electrode provides for a relatively large flat frequency response, e.g., in excess of 1 GHz. The electrode structure is also designed to minimize the effective capacitance of the electrode structure to thereby broaden the bandwidth of the optic modulator of the present invention as compared to devices using solid center electrodes.
REFERENCES:
patent: 4776657 (1988-10-01), Reeder
patent: 5153770 (1992-10-01), Harris
patent: 5193128 (1993-03-01), Farina et al.
patent: 5278923 (1994-01-01), Nazarathy et al.
patent: 5291565 (1994-03-01), Schaffner et al.
Crystal Technology, Inc.
Lee John D.
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