Optical pulse train generator

Details Optical pulse train generator Optical pulse train generator

2006-08-29

2006-08-29

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular beam control device

Modulation

C359S237000, C372S030000

Reexamination Certificate

active

07099359

ABSTRACT:
An optical pulse train generator (2) for use in the transmission of high speed optical data in a return-to-zero (RZ) signalling format is described. The generator (2) comprises a light source (4) operable to produce an unmodulated output; an electro-optic interferometric optical modulator (6) for intensity modulating the unmodulated optical output in dependence on an sinusoidal drive voltage (vdrive) to produce a modulated optical signal, wherein the modulator (6) has an optical transmission versus drive voltage characteristic which is sinusoidal in form and wherein the modulator (6) is operable about a point of minimum optical transmission of said characteristic and said drive voltage has a amplitude (Vdrive) which exceeds one cycle (Vπ) of said characteristic such that the modulated optical signal is non-sinusoidal; and optical pulse shaping means (8, 10, 12) for aligning the phase of the frequency components of said modulated optical signal to produce an optical pulse train in which the pulses are substantially transform limited.

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patent: 5828682 (1998-10-01), Moores
patent: 2002/0141027 (2002-10-01), LaGasse et al.
patent: 0 854 375 (1998-07-01), None
“Tunable RF Optical Source Using Harmonic Carrier Generation,” by S. A. Pappert et al., High-Speed Semiconductor Lasers for Communication, San Jose, CA, US, Feb. 10-11, 1997, vol. 3038, pp. 89-96.
“50-Gbit/S Optical Pulse Storage Ring Using Novel Rational-Harmonic Modulation,” by J. D. Moores et al., Optics Letters, Optical Society of America, Washington, US, vol. 20, No. 24, Dec. 15, 1995, pp. 2547-2549.
“Transform-Limited Optical Pulse Generation Up to 20-GHZ Repetition Rate by a Sinusoidally Driven Ingaasp. Electroabsorption Modulator,” by M. Suzuki et al., Journal of Lightwave Technology, IEEE., New York, US, vol. 11, No. 3, Mar. 1, 1993, pp. 468-473.

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