Multiwavelength Raman fiber laser with a continuously-tunable spacing

School of Chemical and Biomedical Engineering, Nanyang Technological University, Tumasik, 00, Singapore
Optics Express (Impact Factor: 3.49). 05/2006; 14(8):3288-93. DOI: 10.1364/OE.14.003288
Source: PubMed


A spacing-tunable multiwavelength Raman fiber laser with an independently-adjustable channel number is proposed and demonstrated. It uses a novel free-spectral-range (FSR)-tunable comb filter based on a superimposed chirped-fiber Bragg grating (CFBG) and a linear cavity formed by a bandwidth-tunable CFBG reflector, a pumped highly-nonlinear fiber for Raman gain, and an optical circulator based loop mirror. Multiwavelength laser operations with spacing tuning from 0.3 to 0.6 nm and channel number adjustment from 2 to 10 have been achieved.

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Available from: Xinyong Dong
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    • "One cannot adjust wavelength-number at fixed channel-spacing. Such output characteristic parameters cannot be individually controlled [10] [11] [12] [13] [14], which brings sufficient inconvenience and limitations to the practical application. Unlike "
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    ABSTRACT: A multiwavelength erbium-doped fiber laser based on tunable comb spectral filter and intensity-dependent loss modulation is proposed and experimentally demonstrated. The laser allows fine and multifunctional tunable operations of channel-spacing, peak-location, spectral-range, and wavelength-number. More specifically, channel-spacing switch from 0.4 nm to 0.2 nm and peak-location adjustment within half of free spectrum range are obtained via controlling the tunable comb filter. The wavelength-number and the spectral-range of the lasing lines can be accurately controlled by intensity-dependent loss modulation in the laser cavity, enabled by a power-symmetric nonlinear optical loop mirror. In addition, fine control over the wavelength-number at fixed spectral-range is realized by simply adjusting the pump power. More important, the tunable operation process for every type of specific parameter is individual, without influences for other output parameters. Such features of this fiber laser make it useful and convenient for the practical application.
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    • "two categories, in terms of whether the lasing wavelengths can be switched individually. The first type is based on comb filters, such as Lyot-Sagnac filter [1], Mach–Zehnder interferometer (MZI) [2], [3], superimposed chirped fiber Bragg grating (CFBG) [4], [5]. These MWFLs output many channels, but they can be only switched regularly not individually, e.g., interleaving operation or wavelength spacing changed equally. "
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    ABSTRACT: A novel concept of individually switchable and widely tunable erbium-doped multiwavelength fiber laser (MWFL) is proposed and experimentally demonstrated. The key component of the laser is a channel transmissivity individually variable comb filter composed of two cascaded different-length long-period fiber gratings (LPFGs), named cascaded mismatching LPFGs. When inserted into the laser cavity, this polarization-dependent comb filter functions as the wavelength selector and switching filter simultaneously. By properly adjusting the polarization controllers (PCs) in the laser cavity and in the high birefringence Sagnac loop mirror (HiBi-SLM), eleven individually switchable wavelengths with different flexible lasing states, including successively tunable adjacent single-, dual- and triple-wavelength outputs, nonadjacent dual- and triple-wavelength outputs, as well as quadruple- and quintuple-wavelength outputs, have been achieved. This MWFL may be useful in optical fiber sensing or other fields desiring very flexible optical source.
    Full-text · Article · Dec 2011 · Journal of Lightwave Technology
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    • "A spacing-tunable multiwavelength Raman fiber laser with an independently-adjustable channel number, based on a superimposed chirped-fiber Bragg grating (CFBG) and a linear cavity formed by a bandwidth-tunable CFBG reflector, has been demonstrated (X. Y. Dong et al., 2006). Multiwavelength laser operations at room temperature with spacing of 0.3 to 0.6 nm, and channel number of 2 to 10 have been achieved. "

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