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    Please use this identifier to cite or link to this item: http://ir.nknu.edu.tw/ir/handle/987654321/12049


    題名: System design and optimization of optically amplified WDM / TDM hybrid polarization-insensitive fiber-optic Michelson interferometric sensor
    Authors: 黃世巨
    Shih-Chu Huang
    貢獻者: 光電與通訊工程學系
    Keywords: Design optimization;Erbium;Erbium-doped fiber amplifier;Optical crosstalk;Optical interferometry;Optical modulation;Optical pulses;Optical sensors;Sensor systems;Stimulated emission
    Date: 2000
    Issue Date: 2010-11-19 16:50:23 (UTC+8)
    Abstract: We investigate the optically amplified time-division-multiplexed (TDM) polarization-insensitive fiber-optic Michelson interferometric sensor (PIFOMIS) system using erbium-doped fiber amplifier (EDFA). The EDFA was named preamplifier, in-line amplifier or postamplifier; by the position it was located. We find that the preamplifier EDFA has limited usefulness because of its unstable amplification of the optical pulse trains. Both post- and in-line cases can work successfully in the TDM-PIFOMIS system. The amplitudes of the optical pulse trains are stable after amplified by the in-line EDFA, this is a significantly advantage of the optically amplified TDM-PIFOMIS system. The MPDS of the unamplified TDM-PIPOMIS system with an extinction ratio (ER) of 33 dB of the output pulse of the optical guide wave (OGW) modulator was 2.4/spl times/10/sup -5/ rad/(Hz)/sup 1/2/ at 1 kHz. For maintaining MPDS better than 3.4/spl times/10/sup -5/ rad/(Hz)/sup 1/2/ at 1 kHz, the allowable worst ER for the post- and in-line amplified system are 20 and 17.8 dB, respectively, and the corresponding input signal peak power should be larger than -20 and -25 dBm. While employing such two post- and two in-line EDFAs in the TDM-PIFOMIS system, the allowable loss of the sensor array is 47 dB. We analyze the phase-induced intensity noise (PIIN) of the optically amplified TDM-PIFOMIS system in detail and propose methods to reduce the PIIN. The output optical pulse of an intensity modulator with high ER is a key issue to minimize the PIIN and sensor crosstalk in the system. In order to reduce the system PIIN, complexity and cost, we suggest an optimum optically amplified WDM (wavelength-division multiplexing)-TDM hybrid PIFOMIS system with four wavelengths and four eight-sensor subarrays.
    關聯: J. Lightwave Technol. / Vol.18 iss.3, pp.348-359
    Appears in Collections:[光電與通訊工程學系] 期刊論文
    [光通系] 黃世巨

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