Optical frequency shifter and optical soliton-like return-to-zer

Details Optical frequency shifter and optical soliton-like return-to-zer Optical frequency shifter and optical soliton-like return-to-zer

1997-05-28

1999-01-26

Lee, John D.

Optical: systems and elements

Optical frequency converter

Optical laser acoustic delay line type

359161, 359174, 359326, H04B 1002

Patent

active

058644210

ABSTRACT:
An optical frequency shifter which has no insertion loss polarization dependency and no polarization mode dispersion is formed by: at least one ultrasonic wave generator for generating ultrasonic waves; at least one electric acousto-optic element forming at least one diffraction grating therein upon being applied with the ultrasonic waves generated by the ultrasonic wave generator; at least one polarization rotator for rotating a polarization plane of a first primary diffracted light produced by the diffraction grating, by 90.degree.; and a light path through which an input light is entered into the electric acousto-optic element at a Bragg angle of the diffraction grating in a prescribed direction side, the prescribed direction being defined as either identical or opposite to a propagation direction of the ultrasonic waves, so that the first primary diffracted light is produced by the diffraction grating from the input light, a polarization plane rotated light produced by the polarization rotator is entered into the electric acousto-optic element at a Bragg angle of the diffraction grating in the prescribed direction side, and a second primary diffracted light produced by the diffraction grating from the polarization plane rotated light is outputted as an output light. An optical soliton-like return-to-zero pulse transmission system using a combination of this optical frequency shifter and a fixed optical filter in an optical amplifier repeater is also disclosed.

REFERENCES:
patent: 4852106 (1989-07-01), Hino et al.
patent: 5007694 (1991-04-01), Yamamoto et al.
patent: 5523874 (1996-06-01), Epworth
patent: 5629795 (1997-05-01), Suzuki et al.
patent: 5648976 (1997-07-01), Franck et al.

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