Frequency stabilization for multi-location optical FDM networks

Quan Jiang, Mohsen Kavehrad

    Research output: Contribution to journalConference articlepeer-review

    5 Scopus citations


    In a multi-location optical FDM network, the frequency of each user's transmitter can be offset-locked, through a Fabry-Perot, to an absolute frequency standard which is distributed to the users. To lock the local Fabry-Perot to the frequency standard, the standard has to be frequency-dithered by a sinusoidal signal and the sinusoidal reference has to be transmitted to the user location since the lock-in amplifier in the stabilization system requires the reference for synchronous detection. We proposed two solutions to avoid transmitting the reference. One uses an extraction circuit to obtain the sinusoidal signal from the incoming signal. A nonlinear circuit following the photodiode produces a strong second-order harmonic of the sinusoidal signal and a phase-locked loop is locked to it. The sinusoidal reference is obtained by a divide-by-2 circuit. The phase ambiguity (0° or 180°) is resolved by using a selection-circuit and an initial scan. The other method uses a pseudo-random sequence instead of a sinusoidal signal to dither the frequency standard and a surface-acoustic-wave (SAW) matched-filter instead of a lock-in amplifier to obtained the frequency error. The matched-filter serves as a correlator and does not require the dither reference.

    Original languageEnglish (US)
    Pages (from-to)238-241
    Number of pages4
    JournalProceedings of SPIE - The International Society for Optical Engineering
    StatePublished - Apr 30 1993
    EventFrequency-Stabilized Lasers and Their Applications 1992 - Boston, United States
    Duration: Nov 16 1992 → …

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering


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