Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-04-09
1994-04-12
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
385 8, H04B 1004
Patent
active
053030796
ABSTRACT:
External modulation is accomplished in a dual waveguide device wherein substantially identical input optical beams are supplied to the waveguides and wherein each waveguide through its electrode is subject to individual, mutually exclusive control. Modulation signals are applied to each waveguide via its separate electrode. Control signals are applied to each waveguide for adjusting the modulation chirp parameter to a desired fixed, non-zero value. Typically, the desired value of the chirp parameter is one which provides the lowest fiber dispersion penalty for the system. Modulated lightwave signals emerging from the waveguides are combined to form a single output signal suitable for transmission over an optical fiber. In one embodiment, Mach-Zehnder interferometer having separately controllable waveguides has its input coupled to a CW laser. Both III-V semiconductor and Ti:LiNbO.sub.3 Mach-Zehnder interferometers have been utilized as external modulators in accordance with the principles of the present invention.
REFERENCES:
patent: 5031235 (1991-07-01), Raskin
patent: 5101450 (1992-03-01), Olshansky
Gnauck Alan H.
Korotky Steven K.
Zucker Jane E.
AT&T Bell Laboratories
Pascal Leslie
Ranieri Gregory C.
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