All-optical timing restoration

Details All-optical timing restoration All-optical timing restoration

1993-02-05

1994-11-29

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359188, 385 24, H04B 1012

Patent

active

053695194

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: 4932739 (1989-06-01), Islam
patent: 5035481 (1991-07-01), Mollenauer
patent: 5080505 (1992-01-01), Epworth
patent: 5140656 (1992-08-01), Hasegawa
patent: 5224194 (1993-06-01), Islam
"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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