12 March 2013 An efficient WDM-OTDM converter for spectrum interrogation based on nonlinear effects in electro-absorption modulator
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Abstract
In the modern intelligent fiber Bragg grating (FBG) sensing network, the spectrum interrogation should not only have high speed and wavelength resolution, but also use the limited spectrum resource efficiently. In this paper, we propose a spectrum interrogation technique by using a wavelength-division multiplexing (WDM) to optical time-division multiplexing (OTDM) converter, which could map the sensing signals from the wavelength domain to the time domain quickly and efficiently. The converter consists of an electro-optic switch, time delay unit and a multi-wavelength converter. The continuous WDM sensing signals are converted into pulsed WDM signals by using a 10 GHz LiNbO3 intensity modulator as the electro-optic switch. A segment of single mode fiber (SMF) is used as the time delay unit for delaying the pulsed WDM signals overlapped in time. By using a high speed 40 GHz electro-absorption modulator (EAM) as the multi-wavelength converter, the pulsed and delayed WDM signals are converted into OTDM signals with the same wavelength. At last, the light signals after demodulation are detected by photoelectric detector (PD) which has high response speed and low cost. The mapping of the wavelength domain to the time domain in our spectrum interrogation can allocate the spectrum resource efficiently and dynamically. It is experimentally demonstrated that two signals in wavelength domain can be converted into time domain signals carried by a wavelength with a roughly equal conversion efficiency.
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Cuiqin Gao, Cuiqin Gao, Zhaoying Wang, Zhaoying Wang, Xuwei Qin, Xuwei Qin, Tianhe Wang, Tianhe Wang, Chunfeng Ge, Chunfeng Ge, Tianxin Yang, Tianxin Yang, } "An efficient WDM-OTDM converter for spectrum interrogation based on nonlinear effects in electro-absorption modulator", Proc. SPIE 8604, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII, 860414 (12 March 2013); doi: 10.1117/12.2001183; https://doi.org/10.1117/12.2001183
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