Doppler phase shifting using dual, switched phase shifting...

Details Doppler phase shifting using dual, switched phase shifting... Doppler phase shifting using dual, switched phase shifting...

2000-01-05

2002-07-30

Dang, Hung Xuan (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S245000, C359S285000

Reexamination Certificate

active

06426828

ABSTRACT:

BACKGROUND
Different ways are known of generating a frequency shift in an optical signal. One way of doing this by using an integrated optic acousto-optical tunable filter or AOTF. Such a device uses the acousto-optic effect in a special material, such as Lithium Niobate, to generate an optical frequency shift. A surface acoustic wave transducer is fed by a driving signal, e.g. 210 MHz.
Other ways of creating frequency shifts are desirable.
SUMMARY
The present application teaches an optical signal shifter, formed using two oscillator waveforms that are 180 degrees out of phase. The optical signal is switched between the two waveforms such that each phase modulator is used during its ascending. Hence, the waveform is shifted in the same direction by continually phase shifting between the two driving devices.


REFERENCES:
patent: 5774218 (1998-06-01), Takamiya

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