Adjustable optical amplitude and phase modulator, and a soliton

Details Adjustable optical amplitude and phase modulator, and a soliton Adjustable optical amplitude and phase modulator, and a soliton

1996-12-18

1999-01-05

Ullah, Akm E.

Optical waveguides

With optical coupler

372 6, 359156, G02B 626

Patent

active

058570403

ABSTRACT:
The invention relates to an adjustable optical amplitude and phase modulator using a non-linear optical loop mirror having two control inlets and a signal inlet. In a preferred embodiment, a single clock signal is split into two and applied to the two control inlets. The invention also relates to a soliton regenerator including said optical modulator. In an important variant, said modulator receives a soliton bit train on its signal inlet at a bit rate f.sub.s, and on its control inlets it receives a clock signal at half that frequency f.sub.c =f.sub.s /2. In an advantageous embodiment, said clock signal is applied with a phase shift of .pi. between the two control inlets, so as to minimize the effects of collisions between solitons. The invention is applicable to long distance telecommunications by optical fiber.

REFERENCES:
patent: 5050183 (1991-09-01), Duling, III
patent: 5111322 (1992-05-01), Bergano et al.
patent: 5608560 (1997-03-01), Abram et al.
patent: 5689596 (1997-11-01), Evans
"A walk-off nalanced Nonlinear Fiber loop Mirror Switch", IEEE Photonics Technology Letters By Lee et al., vol. 7, No. 12, pp. 1441-1443, Dec. 1995.
Hak Kyu Lee et al, "A Walk-Off Balanced Nonlineare Fiber Loop Mirror Switch", IEEE Photonics Technology Letters, vol. 7, No. 12, 1 Dec. 1995, pp. 1441-1443.
J. K. Lucek et al, "All-Optical Signal Regenerator", Optics Letters, vol. 18, No. 15, 1 Aug. 1993, pp. 1226-1228.
P-L Francis et al, "Reduction of averaged soliton interaction forces by amplitude modulation", Optics Letters, 15 Apr. 1993, vol. 18, No. 8, ISSN 0146-9592, pp. 583-585.

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