All-optical timing restoration

Details All-optical timing restoration All-optical timing restoration

1991-04-02

1993-06-29

Gonzalez, Frank

Optical waveguides

Having nonlinear property

341137, 341138, 359108, 359109, 359332, 385123, G02B 616

Patent

active

052241947

ABSTRACT:
Timing restoration for a series of input pulses is performed optically in a transmission or switching system, using a nonlinear material with negligible walk-off that also receives an essentially orthogonally polarized series of reference pulses. In the nonlinear material, the input pulses are frequency shifted by the presence of the reference pulses. For a material with negligible walk-off, the frequency shift only occurs when the pulses partially overlap, but not when the pulses are coincident. The frequency shifted output from the nonlinear material is supplied to a dispersive delay line that translates the frequency shift into a time shift, such that the input pulses are retimed by the reference pulses. If the nonlinear material has a nonlinear index of refraction n.sub.2 >0, then the dispersive delay line must have an anomalous Group Velocity Dispersion (GVD); on the other hand, if the nonlinear material has an index of refraction n.sub.2 <0, then the dispersive delay line must have a normal GVD. The nonlinear and dispersive media may be separate sections or distributed in the same medium.

REFERENCES:
patent: 4881788 (1989-11-01), Doran
patent: 4932739 (1990-06-01), Islam
patent: 5020050 (1991-05-01), Islam
patent: 5078464 (1992-01-01), Islam
patent: 5115488 (1992-05-01), Islam et al.
"Chirp Mechanisms in Soliton-Dragging Logic Gates" M. N. Islam et al. Optic Letters vol. 16, No. 4, Feb. 15, 1991, pp. 214-216.

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