Method and apparatus for controlling a frequency hopping laser

Details Method and apparatus for controlling a frequency hopping laser Method and apparatus for controlling a frequency hopping laser

2003-03-25

2008-08-26

Chan, Jason (Department: 2613)

Optical communications

Multiplex

Code division multiplexing

C398S078000, C398S089000, C398S197000, C372S019000, C372S028000, C372S032000, C359S278000

Reexamination Certificate

active

07418205

ABSTRACT:
An optical spread spectrum communication system includes a tunable laser which sequentially outputs optical signals having different wavelengths. The laser produces a frequency spectrum having a plurality of closely spaced modes relative to optical frequencies. The system further includes an optical modulator and a frequency synthesizer. The frequency synthesizer controls the optical modulator to allow specific modes from the frequency spectrum to pass through. Additionally, the system includes a tunable filter and a phase locked loop (PLL) control circuit. The PLL control circuit controls the filter to select specific channels. The selection of the specific modes by the modulator and the selection of channels by the tunable filter are performed independent of each other and are based on randomly assigned codes generated in accordance with one or more algorithms.

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