Mach-Zehnder type modulator and method of driving the same

Details Mach-Zehnder type modulator and method of driving the same Mach-Zehnder type modulator and method of driving the same

1996-09-23

1997-08-05

Ullah, Akm E.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

G02B 600, G02F 1035

Patent

active

056550340

ABSTRACT:
A Mach-Zehnder modulator has a first waveguide path, a second waveguide path and first and second phase modulator sections respectively formed in the first and second waveguide paths. Those two waveguide paths have different equivalent refractive indexes so that with no modulation electric signal applied to the first and second phase modulator sections, lights waveguided through the first and second phase modulator sections have a phase difference of (2N+1).pi. (N: 0 or a positive integer). No voltage or a constant voltage is applied to the second phase modulator section, and a modulation signal is applied to the electrode of the first phase modulator section. When a voltage of 0 is applied to the first phase modulator section, a light OFF state is acquired, and when a voltage of V.pi. is applied to the first phase modulator section, a light ON state is acquired. Therefore, negative chirping is generated at the light ON time and the light OFF time.

REFERENCES:
patent: 5488503 (1996-01-01), Schaffner et al.
patent: 5528707 (1996-06-01), Sullivan et al.
patent: 5548668 (1996-08-01), Schaffner
Sano et al; "High speed properties of InGaAs/InAlAs MQW Mach-Zehender optical modulators"; 1993; pp. 4-187; Proceedings of the 1993 IEICE, Spring Conference, Book 4, Lecture No. C-151.
Sano et al; "High-speed InGaAs/InAlAs MQW Mach-Zehnder-type optical modulator". 1993; pp. 215-217; OFC/IOOC '93 Technical Digest, Thursday Afternoon, 1993.
Ishizaka et al; "Analysis on Chirping Characteristics of MQW Mach-Zehnder Modulator with Absorption Loss"; 1994; p. 173; Proceedings of the 1994 IEICE Autumn Conference, Book 1, Lecture No. C-173.

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