A switchable dual-wavelength fiber laser based on phase-shifted fiber Bragg grating combined with Sagnac loop
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1.Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Information Science & Technology University, Beijing 100016, China;2. Beijing Key Laboratory of Optoelectronic Measurement Technology, Beijing Information Science & Technology University, Beijing 100192, China

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    Abstract:

    A switchable dual-wavelength erbium-doped fiber (EDF) laser is proposed and demonstrated. The interference filter is achieved by employing a phase-shifted fiber Bragg grating (PSFBG) combined with Sagnac loop structure. By adjusting polarization controller (PC) states, the birefringence effect is introduced to weaken mode competition, then stable and switchable dual-wavelength fiber laser can be realized. Based on coupled-mode theory and transmission matrix, the Sagnac loop transmission characteristics are studied. The experimental results show that the proposed fiber laser can operate in switchable dual-wavelength output mode at room temperature just by simply adjusting PC. The output wavelength range of fiber laser is 1 556.128—1 556.384 nm, the side mode suppression ratio (SMSR) is over 45 dB, and dual-wavelength spacing as small as 0.048 nm is achieved, which can be used in high-fineness dense wavelength division multiplexing (DWDM) systems and similar structures.

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ZHAO Xiao-li, LUO Fei, ZHANG Yu-min, MENG Fan-yong, DONG Ming-li. A switchable dual-wavelength fiber laser based on phase-shifted fiber Bragg grating combined with Sagnac loop[J]. Optoelectronics Letters,2019,15(2):122-126

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History
  • Received:July 28,2018
  • Revised:September 21,2018
  • Online: April 03,2019
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