Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1996-08-19
1998-07-14
Epps, Georgia Y.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359245, 359260, 359276, 359286, 359174, 359187, 372 94, 385 1, 385 2, 455202, G02F 103, G02F 101, H04B 1002, H04B 106
Patent
active
057813272
ABSTRACT:
An electro-optic modulator and a method for its use, in which an optical carrier is effectively suppressed for transmission of a radio-frequency (rf) modulating signal over an optical communication link, to provide improved demodulator performance. A carrier component is recovered from the modulator, amplified, and reused, to minimize the effect of optical carrier losses. In one embodiment of the invention, a modulator (10) with complementary output ports (20 and 22) generates a carrier-suppressed output (FIG. 2B) containing rf sidebands from one port (20) and a strong carrier component (FIG. 2C) from the other output port (22). The carrier component is filtered in a residual sideband filter (14), amplified in an optical amplifying medium (12) and returned to the modulator (10) as its carrier input. In a second embodiment of the invention, a modulator (30) with a single output port produces rf sidebands and a suppressed carrier component (FIG. 4A), all of which are amplified in an optical amplifying medium (32) and coupled to an optical circulator (34), which, in cooperation with a narrowband filter (36), separates the rf sidebands from the amplified carrier component, the latter being returned to the modulator (30) as the carrier input. In both embodiments, a suppressed-carrier optical signal is obtained for transmission over a communication link, but carrier losses are minimized by recovery and recirculation of the carrier. In an alternate embodiment of the invention (FIG. 5), a second modulator (40) removes any residual rf components and avoids any unwanted cavity resonance.
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Brock John C.
Wickham Michael G.
Epps Georgia Y.
Lester Evelyn A.
TRW Inc.
Yatsko Michael S.
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