Optical signal identification technique

Details Optical signal identification technique Optical signal identification technique

H - Electricity

04

J

H04J 14/02 (2006.01) H04B 10/158 (2006.01)

Patent

CA 2104189

- 8 - OPTICAL SIGNAL IDENTIFICATION TECHNIQUE Abstract A wavelength-multiplexed optical signal identification technique in which each of the individual optical signals within a multiplexed signal are modulated at a unique low- frequency. This modulation is performed at the transmission site of the optical signal, and the specific frequencies of modulation are chosen to be very much lower than the low-frequency cut-off of any other information encoded upon the optical signals. At the reception site of the multiplexed signal, the invention directs each of the individual optical signals, as a function of the particular low-frequency modulation evident upon each signal, to a particular tunable Fabry-Perot optical filter. As Fabry-Perot filters have the ability to track the frequency of an individual channel, problems associated with wavelength drift are eliminated. Furthermore, Fabry-Perot filters offer a very narrow optical passband, allowing inter-channel cross-talk and noise levels to be minimized within wavelength-multiplexed optical systems employing the signal identification technique.

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