Optical communication system employing spectrally sliced optical

Details Optical communication system employing spectrally sliced optical Optical communication system employing spectrally sliced optical

1996-08-30

1999-01-19

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

127130, 127140, 127188, H04J 1400

Patent

active

058619658

ABSTRACT:
An apparatus and method provides optical multiple wavelength signals using a single, broadband optical source such, for example, as an LED, to generate many independent optical wavelength channels. An optical transmitter includes a wavelength channel defining assembly which resolves the broad spectrum pulses output by the source into discrete wavelength bands constituting respective pulses (i.e., wavelength channels) and which inserts a delay between the bands to define a sequence of individually addressable channels.
In accordance with one embodiment of the invention, spectral splicing is achieved by a multiple channel filter, and insertion of the respective delays is achieved by individual fiber sections, each section having a length selected to introduce a particular delay, coupled to the output ports of the router. The inserted delays can be conveniently selected to separate adjacent wavelength channels and thereby minimize the likelihood of crosstalk. Pulses of the thus-resolved channels arrive at different times to a multiplexer which may be configured, for example, as a passive WDM multiplexer or as a star combiner. The resulting sequence of addressable wavelength channels may be supplied to one or more high-speed, broadband modulators, with each modulator being operable to modulate some or all of the channels.

REFERENCES:
patent: 5631758 (1997-05-01), Knox et al.
K. Liou, et al, "Monolithically Integrated Semiconductor LED-Amplifier for Applications as Transceivers in Fiber Access Systems," IEEE Photonics Technology Letters, vol. 8, No. 6, Jun. 1996, pp. 800-802.
S. S. Wagner, et al, "Broadband High-Density WDM Transmission Using Superluminescent Diodes," Electronics Letters, 24 May 1990, vol. 26, No. 11, pp. 696-697.
M. H. Reeve, et al., "LED Spectral Slicing for Single-Mode Local Loop Applications," Electronics Letters, Mar. 31, 1988, vol. 24, No. 7, pp. 389-390.

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