Staggered quadrature phase shift keyed laser modulator

Details Staggered quadrature phase shift keyed laser modulator Staggered quadrature phase shift keyed laser modulator

1988-11-16

1990-02-27

Moskowitz, Nelson

Amplifiers

Parametric amplifiers

Semiconductor type

375 52, 375 54, 455608, 455611, H01S 310, H04L 2710

Patent

active

049049631

ABSTRACT:
A staggered quadrature phase shift keyed modulator which avoids the need for timing circuits. Three phase modulators serially change the phase of a laser beam so that it may sequentially have a total phase shift of .pi., .pi./2, 0, -.pi./2. The input signal is divided into two pulse trains, one of which is delayed to provide the stagger. The two pulse trains are logically combined to form three control signals for the modulators.

REFERENCES:
patent: 3131363 (1964-04-01), Landee et al.
patent: 3242262 (1966-03-01), Melos et al.
patent: 4649549 (1987-03-01), Halpern et al.
patent: 4725844 (1988-02-01), Goodwin et al.
patent: 4773084 (1988-09-01), Scholz
Bozic et al.; "Design of a Digital PSK Modulator"; Int. J. Electr.; 2/82, vol. 52, #2, pp. 157-165.

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