FM modulator

Details FM modulator FM modulator

2005-06-21

2005-06-21

Chan, Jason (Department: 2633)

Optical communications

Receiver

Heterodyne

C398S187000

Reexamination Certificate

active

06909855

ABSTRACT:
A branch portion101branches an inputted electrical signal into an in-phase signal and an opposite phase signal which have an opposite relation as to a phase. A first FM laser104converts the in-phase signal into an optical frequency-modulated signal (a first optical signal) having a center wavelength λ1and then outputs the resultant signal. A second FM laser105converts the opposite phase signal into an optical frequency-modulated signal (a second signal) having a center wavelength λ2and then outputs the resultant signal. The two optical signals are combined and then inputted into an optical-electrical converting portion106. The optical-electrical converting portion106subjects the inputted optical signals to optical heterodyne detection by its square-law detection characteristic, and outputs a beat signal between the two optical signals which is a wide-band FM signal at a frequency corresponding to a wavelength difference Δλ(=|λ1−λ2|) between the first optical signal and the second optical signal. It is thus possible to increase frequency deviation of the outputted FM signal and thus greatly improve a CNR.

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K. Kikushima et al., “Optical Super Wide-Band FM Modulation Scheme and Its Application to Multi-Channel AM Video Transmission Systems”, IOOC '95 Technical Digest, vol. 5, PD2-7, pp. 33 and 34.

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