Detection of frequency-modulated tones in electromagnetic signal

Details Detection of frequency-modulated tones in electromagnetic signal Detection of frequency-modulated tones in electromagnetic signal

1996-09-13

2000-07-11

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1006

Patent

active

060881445

ABSTRACT:
An apparatus and method for detecting a channel of a fiber-optic system. According to one embodiment, a filter is adapted to receive an electromagnetic signal resulting from modulation of a carrier frequency over a frequency range by a modulation signal. The filter has a plurality of transmissivity peaks over the frequency range, whereby the filter generates a plurality of intensity pulses as frequency of the electromagnetic signal varies over the frequency range. A detector is adapted to detect the modulation signal based on the plurality of intensity pulses. According to another embodiment, an electromagnetic signal corresponding to a channel and resulting from modulation of a carrier frequency over a frequency range by a modulation signal is received. A plurality of intensity pulses are generated as frequency of the electromagnetic signal varies over the frequency range, and the channel is detected in accordance with the intensity pulses.

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