A simple design of multi-wavelength generation in the S-band region of the optical network transmission is proposed. The design consists of broad-band fiber Bragg grating (BB-FBG), which acts as a filter to enhance operation in the S-band region. A Sagnac loop mirror (SLM) is used to generate multiple wavelength oscillations in the ring cavity. The output consists of 60 lasing wavelengths oscillating simultaneously between 1464 nm and 1521 nm with a spacing of 0.92 nm and an output linewidth of 0.66 nm.
Abstract-A fiber loop mirror (FLM) with two-stage high birefringence (Hi-Bi) fibers is theoretically and experimentally studied for various rotation angles and Hi-Bi fiber lengths. The experimental spectra are observed to be in good agreement with the theoretical spectra, verifying our theoretical model. The wavelength interval of the comb filter depends on the Hi-Bi fiber lengths and rotation angles. By varying the rotation angle from 0 • to 90 • , a comb-like transmission spectrum with small wavelength spacing is evolving into an exotic but periodic transmission spectrum and eventually become a larger wavelength spacing transmission spectrum. The FLM is useful in many applications such wavelength division multiplexing power equalization and management, switchable multi-wavelength fiber laser, optical switch and etc.
Abstract:We propose and demonstrate the generation of a supercontinuum (SC) spectrum from a 10 m long silica fiber co-doped with zirconia-yttria-alumino and erbium (Zr-EDF) as a non-linear medium. The proposed system utilizes a 2 m long Zr-EDF in a ring laser configuration to generate mode-locked pulses at 1560 nm based on the non-polarization rotation (NPR) technique. The fiber laser generates a mode-locking spectrum from 1526 to 1640 nm with a peak power of -10 dBm at approximately 1565 nm as well as a 6.1 nm bandwidth at the 3 dB level. The generated mode-locked pulses have average and peak powers of 15 mW and 1 kW respectively with a repetition rate of 23.2 MHz. These pulses are subsequently used to generate the SC spectrum from the 10 m Zr-EDF, with the SC spectrum obtained having a 200 nm bandwidth from 1500 nm as well as a large 3-dB bandwidth of 68.2 nm. The SC pulse width is 0.59 ps with a symmetrical shape at about 1600 nm and a 3-dB bandwidth of approximately 0.12 ps. This is the first report of a zirconia host employed as a non-linear medium for SC generation.
In this paper, a simple design of linear cavity dual-wavelength fiber laser (DWFL) is proposed. Operating in the C-band region stretching from 1538.3 nm to 1548.6 nm, an arrayed waveguide grating (AWG) is used to generate the dual-wavelengths output together with a broadband fiber Bragg grating as a back reflector and an optical circulator with a 10% output coupling ratio which acts as a front mirror. The measured average output power of the DWFL is about-5.66 dBm and with a side mode suppression ratio (SMSR) of 53.1 dB. The spacing
In this paper, a high-resolution fiber temperature sensor is proposed and demonstrated using the frequency beating technique. The sensor uses a constant wavelength (CW) at 1539.96 nm as the reference signal for the frequency beating technique. The sensor signal is provided by a fiber Bragg grating (FBG) tuned single-longitudinal mode (SLM) fiber laser, which consists of a 0.5-m long highly doped Zirconium-Erbium doped with an erbium concentration of 3000 ppm as the gain medium. The signal of the SLM, which is generated by the FBG in response to external temperature changes, is mixed with the CW signal using a 3-dB fused coupler into a 6-GHz photodetector to generate frequency beating. The typical response of the system is about 1.3 GHz/°C, with nominal temperature measurement resolutions of 0.0023°C being achieved, taking into account the resolution bandwidth of 3 MHz of the radio frequency spectrum analyzer.Index Terms-Dual-wavelength pulse, erbium-doped fiber, frequency generation, saturable absorber.
An efficient system for generating the four-wave mixing (FWM) effect in a short length of a highly nonlinear fiber (HNLF) is demonstrated using a ring configuration, which to our knowledge is the first of its kind to be reported. The conversion efficiency obtained is -4 dB for a HNLF length of 100 m when pumped with a 90 mW diode pump laser at 1490 nm in ring configuration which is the highest ever reported. The signal-to-noise (SNR) ratio is 43 dB. The conversion efficiency and SNR are flat over a span of 20 nm and can provide an effective means of wavelength conversion for telecommunication applications.
We describe and compare the performances of two crucial configurations for a tunable dual-wavelength fiber laser, namely, the linear and ring configurations. The performances of these two cavities and the tunability in the dual-wavelength output varied from 0.8 to 11.9 nm are characterized. The ring cavity provides a better performance, achieving an average output power of 0.5 dBm, with a power fluctuation of only 1.1 dB and a signal-to-noise ratio (SNR) of 66 dB. Moreover, the ring cavity has minimal or no background amplified spontaneous emission (ASE).OCIS codes: 060.2320060. , 060.2410 Dual-wavelength tunable fiber lasers (DWTFLs) are relevant to the provision of a stable and tunable dual wavelength output that can be used in many applications, such as the study of high-bit-rate soliton pulses [1] , differential absorption measurement of trace gases [2] , photonic generation of microwave carriers [3] , and microwave photonic filters [4] . Initial research into the development of dualwavelength fiber lasers has been limited by the inability to generate a high power lasing output. This limitation was caused by the effect of mode competition between the closely spaced wavelengths; resulting in the domination of the longer wavelength over the shorter wavelength. The mode competition itself is largely caused by the homogenous broadening effect in erbium-doped fibers (EDFs), which are normally used as the gain media for fiber-based dual-wavelength sources. To overcome the effect of the homogenous broadening in EDF-based dual-wavelength fiber laser sources, various methods have been proposed, including the cooling of the EDF in liquid nitrogen [5,6] by using elliptical EDFs [7] or by incorporating polarization maintaining fiber Bragg gratings (FBGs) for wavelength selection [8] , utilizing frequency shifter in the cavity [9] , and many other methods [10−13] . The key ability which is sought after in the development of a DWFTL is repeatability. Generally, multiwavelength output generated using FBGs as filters to select specific wavelengths provide tunabilty by adjusting the strain or compression that the FBG contends with because of the repeatability issue. The reason is the difficulty to revert to the original position to produce the previous wavelength once the FBG has been modified to select a new wavelength. This problem can be overcome using a filter mechanism with a series of pre-determined wavelengths, such as an arrayed waveguide grating (AWG), as proposed in this letter.In addition, the cavity configuration plays an important role in the generation of a high-powered output with a good signal-to-noise ratio (SNR). Numerous configurations have been proposed to generate DWFLs, such as linear cavities [14,15] , ring cavities [16,17] , and sigma cavity configuration [18] . This is in line with the growing research interest in the generation of high-powered DWFLs for applications such as wavelength conversion using four wave mixing (FWM) [19] , generation of microwave signals [20] , and generation of terahertz w...
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