Optical-optical modulators

Details Optical-optical modulators Optical-optical modulators

1995-05-22

1997-05-06

Ngo, John

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

G02B 610

Patent

active

056279205

ABSTRACT:
An optical-optical modulator (10) has a substrate (1) made of Zcut-LiNbO.sub.3 and a Ti-diffused waveguide (2) thereon. The waveguide (2) is separated into two branches which merge later into one again and constitute the Mach-Zehnder interferometer. A pair of electrodes (3a, 3b) for phase modulation is formed on a modulation part (A) which is in the middle of the waveguide (2). A CdS.sub.x Te.sub.1-x photoelectric conversion film (6) is formed directly contacting the pair of electrodes (3a, 3b). The photoelectric film (6) is manufactured by oblique vapor deposition utilizing CdS and CdTe as two vapor deposition sources. When the photoelectric conversion film 6 receives a control light (Lc), the film (6) generates voltage. The generated voltage is applied to the pair of electrodes (3a, 3b) and becomes a modulation signal of the carrier light (La).

REFERENCES:
patent: 4674827 (1987-06-01), Izutsu et al.
patent: 5315422 (1994-05-01), Utaka et al.
Yajima et al., "Optical-Optical Guided-Wave Modulator," Appl. Phys. Lett., vol. 45 No. 3, Aug. 1984, pp. 214-216.

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