Tunable and switchable multi-wavelength erbium-doped fiber ring laser based on a modified dual-pass Mach-Zehnder interferometer

Laboratory of Photonic Information Technology, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangdong, China.
Optics Letters (Impact Factor: 3.29). 07/2009; 34(14):2135-7. DOI: 10.1364/OL.34.002135
Source: PubMed


A tunable and switchable multi-wavelength erbium-doped fiber ring laser based
on a new type tunable comb filter is proposed and demonstrated. By adjusting
the polarization controllers, dual-function operation of the channel spacing
tunability and the wavelength switching (interleaving) can be readily achieved.
Up to 29 stable lasing lines with 0.4 nm spacing and 14 lasing wavelengths with
0.8 nm spacing in 3 dB bandwidth were obtained at room temperature. In
addition, the lasing output, including the number of the lasing lines, the
lasing evenness and the lasing locations, can also be flexibly adjusted through
the wavelength-dependent polarization rotation mechanism.

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Available from: Zhi-Chao Luo, Dec 20, 2013
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    • "and λ are the length difference between the two arms, the effective index of the SMF, and the input wavelength, respectively. The transmission of MDMZI is given in [14], which is reproduced here "
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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.
    Optics Communications 01/2015; 340:63-68. DOI:10.1016/j.optcom.2014.11.090 · 1.45 Impact Factor
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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.
    Journal of Lightwave Technology 12/2011; 29(21-29):3319 - 3326. DOI:10.1109/JLT.2011.2168386 · 2.97 Impact Factor
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    • "Although the two output ports of a standard M–Z interferometer have a switching relationship, the dynamic switchable operation of a single output port cannot be achieved. Recently, we demonstrated a multiwavelength fiber laser with a wavelength switchable function based on a modified dual-pass M–Z interferometer composed of a 3-dB and a non-3-dB coupler [17]. However, since the wavelength switchable operation of the comb filter is related to the polarization states of the light propagating along the interferometer arms, a polarization controller (PC) should be employed in one arm to finely control the polarization states. "
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    ABSTRACT: We propose and demonstrate a multiwavelength switchable fiber ring laser by employing a simple but novel polarization beam splitter (PBS)-based Mach-Zehnder (M-Z) comb filter. The proposed comb filter consists of a rotatable polarizer, a PBS, and a 3-dB fiber coupler. By adjusting the polarization state of the lasing light launched into the PBS, the multiwavelength switchable operation can be easily achieved. When the proposed comb filter was incorporated into the laser cavity, up to 11 multiwavelength switchable lasing lines with a channel spacing of 1.2 nm were obtained. In addition, the lasing locations and the number of the lasing lines can be flexibly tuned by exploiting the wavelength-dependent loss mechanism.
    IEEE Photonics Journal 05/2011; 3(2-3):197 - 202. DOI:10.1109/JPHOT.2011.2120601 · 2.21 Impact Factor
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