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학술지 Field Trial of Automatic Bias Control Scheme for Optical IQ Modulator and Demodulator with Directly Detected 112 Gb/s DQPSK Signal
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저자
정환석, 장순혁, 이종현, 김광준
발행일
201310
출처
Optics Express, v.21 no.21, pp.24962-24968
ISSN
1094-4087
출판사
Optical Society of America(OSA)
DOI
https://dx.doi.org/10.1364/OE.21.024962
협약과제
13VI1500, 차세대 광전달망 구축을 위한 테라급 광-회선-패킷 통합 스위칭 시스템 기술개발, 이종현
초록
When optical transceivers employing in-phase and quadrature (IQ) modulators and demodulator are used in real transmission systems, it is very important to search optimum bias points and to prevent bias drift from their optimal points due to of temperature variation, stress, or device aging. We demonstrate a simple and cost-effective automatic bias control scheme for optical IQ modulator and demodulator based on RF power and peak voltage detection. The principle of control scheme and effects of bias voltage on monitoring parameters are presented. The dynamic performance of the control scheme, effects of optical signal-to-noise ratio (OSNR) of signal, and effects of temperature variation are also evaluated. For the evaluation of bias control scheme at real-environment, we implement the automatic bias control scheme in 112 Gb/s dual carrier-differential QPSK (DC-DQPSK) transceiver, and investigate its long-term stability performances in a field transmission experiment over 797-km of installed fiber and ROADM. ©2013 Optical Society of America.
KSP 제안 키워드
Bias control, Control scheme, Device aging, Dual carrier, Dynamic performance, Field transmission, Field trial, IQ modulator, In-phase, Long-Term Stability, Monitoring Parameters