Sub-carrier multiplexing in broadband optical networks

Details Sub-carrier multiplexing in broadband optical networks Sub-carrier multiplexing in broadband optical networks

1997-10-17

2000-06-27

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359188, 359181, 359173, 372 96, 385 14, H04B 1001, H04B 1004, H04B 1012, H01S 308

Patent

active

06081361&

ABSTRACT:
In a WDM fiber-optic network, a unique laser transmitter enables signals to be routed at three hierarchical levels: at one level discrimination among signal paths is based on N WDM wavelength channels, at another level discrimination is based on m AM subcarrier frequency channels, and at a third level discrimination is based on n FM subcarrier frequency channels. Thus, a total of Nmn distinguishable optical channels can be accommodated and a like number of users served. The laser transmitter comprises a broadband, tunable semiconductor laser which includes an intracavity, integrated composite reflector to which a tuning voltage and a FM dither signal are applied, an intracavity gain section to which drive current is applied, and an extracavity, integrated electroabsorption modulator to which an information (e.g., data, voice, video) signal and an AM dither signal are applied. The tuning voltage provides coarse wavelength tuning among N WDM channels, whereas the FM dither signal produces an additional m channels via FM-SCM. The AM dither likewise produces an additional n channels via AM-SCM.

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