Development of a multiwavelength Raman fiber laser based on phase-shifted fiber Bragg gratings for long-distance remote-sensing applications

Han, Young‐Geun; Anh, Trần Thị Vân; Kim, Sang-Hyuck; Lee, Sang Bae

doi:10.1364/ol.30.001114

Cited by 51 publications

(34 citation statements)

References 8 publications

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“…Note that the cascaded Raman shift is defined by intensity integral along the fiber that is larger for the 4% cavity. For quantitative analysis of the effects, numerical simulations of the spatial distributions in both cases are needed Since the effect of RDFB is important in a normal cavity, as shown here for Fresnel reflection, it may also have an impact on power equalization in other multi-wavelength RFLs with long cavities [4][5][6][7][8][9][10] . Note that similar effect was observed for a Brillouin comb which becomes uniform with the assistance of RS at high pump power 15 .…”

Section: Multiwavelength Generationmentioning

confidence: 99%

“…Several techniques have been proposed to ensure stable multi-wavelength laser operation based on semiconductor optical amplifiers 1 , erbium-doped fiber lasers 2 , spectrum sliced supercontinuum 3 or Raman fiber lasers (RFLs) [4][5][6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

“…As a result, multi-wavelength RFLs can emit up to 58 stable lines simultaneously with 100 or 50 GHz spacing 4 in different spectral bands 7 . Fiber Bragg gratings (FBGs) reflecting several wavelengths being either multimode 8 , phase-shifted 9 or sampled 10 have also been demonstrated for multi-wavelength operation in RFLs with linear cavities but, generally with a relatively low number of spectral lines.…”

Section: Introductionmentioning

confidence: 99%

“…Note that all multiwavelength RFL schemes [4][5][6][7][8][9][10] are based on long fibers (4-50 km), so Rayleigh scattering (RS) accumulated over a long distance and amplified via the Raman effect, may play an important role in such systems. A stable narrow-linewidth lasing utilising RS-based random distributed feedback only (without any regular reflector) has been demonstrated recently 13 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Rayleigh-scattering distributed feedback on multiwavelength Raman fiber laser generation

et al. 2011

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We experimentally demonstrate a Raman fiber laser based on multiple point-action fiber Bragg grating (FBG) reflectors and distributed feedback via Rayleigh scattering in a ~22 km long optical fiber. Twenty two lasing lines with spacing of ~100 GHz (close to ITU grid) in C-band are generated at Watts power level. In contrast to the normal cavity with competition between laser lines, the random distributed feedback cavity exhibits highly stable multiwavelength generation with a power-equalized uniform distribution which is almost independent on power. The current set up showing the capability of generating Raman gain of about 100-nm wide giving the possibility of multiwavelength generation at different bands.

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Section: Multiwavelength Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Rayleigh-scattering distributed feedback on multiwavelength Raman fiber laser generation

et al. 2011

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“…Moreover, tunable as well as multiwavelength RFL operation has been proved to be feasible. 2 These quite unique features, coupled with the compactness, practicality, and potential for high efficiency, make RFLs very attractive CW light sources for a variety of applications, such as optical coherence tomography, 3 long-distance remote sensing, 4 and especially in telecommunication, as pump and signal sources for distributed amplified systems (see, e.g., Ref. 5 and references therein).…”

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confidence: 99%

Experimental demonstration of mode structure in ultralong Raman fiber lasers

et al. 2007

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We present the first experimental demonstration of a resolvable mode structure with spacing c /2nL in the RF spectra of ultralong Raman fiber lasers. The longest ever demonstrated laser cavity ͑L =84 km͒, RF peaks of ϳ100 Hz width and spacing ϳ1 kHz have been observed at low intracavity powers. The width of the peaks increases linearly with growing intracavity power and is almost independent of fiber length. © 2007 Optical Society of America OCIS codes: 190.5650, 140.3550. The Raman fiber laser (RFL) is an example of a photonic system relying on the fundamental nonlinear optical effect of stimulated Raman scattering. The stimulated Raman scattering effect in a RFL manifests itself by shifting the spectrum of electromagnetic radiation propagating through an optical fiber towards longer wavelengths. It is then possible to overcome the fiber loss at the shifted Stokes wavelength by providing Raman amplification with a relatively low pump power ͑Ͻ1 W͒. As was demonstrated in Ref. 1, by creating a cavity at the Stokes wavelength, e.g., applying fiber Bragg gratings (FBGs) as cavity reflectors, a Raman laser might be implemented in a ϳ1 km long fiber waveguide. Since the Raman gain spectrum is rather broad in conventional germanosilicate fibers and multiple-order Stokes shifts can be achieved, RFLs can be designed to operate at almost any wavelength in the near-IR region ͑1.1-1.7 m͒. Moreover, tunable as well as multiwavelength RFL operation has been proved to be feasible. 2 These quite unique features, coupled with the compactness, practicality, and potential for high efficiency, make RFLs very attractive CW light sources for a variety of applications, such as optical coherence tomography, 3 long-distance remote sensing, 4 and especially in telecommunication, as pump and signal sources for distributed amplified systems (see, e.g., Ref. 5 and references therein).The use of noise-efficient distributed Raman amplification in optical communication links has become popular in recent years thanks to the availability of high-power laser pumps, in particular, multiwavelength RFLs providing broadband gain with excellent spectral flatness. This has, in turn, spawned a great deal of interest in research on efficient control and optimization of the signal power evolution within the fiber span (see, e.g., Refs. 5 and 6 and references therein, for an overview of the literature). Recently, an interesting realization of ultralong Raman laser architecture for quasi-lossless signal transmission in fiber communication links has been proposed and implemented. [7][8][9] In such an ultralong laser, the combined forward-and backward-propagating power generated at the Stokes wavelength at ϳ1455 nm inside the cavity of the RFL (formed in the transmission fiber itself) experiences reduced variations along the fiber span. Hence, it can be used as a secondary pump to provide a near constant Raman gain for optical signal propagating at 1550 nm. Quasi-lossless transmission over 75 km within 36 nm bandwidth has been demonstrated in Ref. 9. Evi...

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Cladding mode coupling suppression in hole‐assisted fiber BRAGG gratings

Han

Kim

Cho

et al. 2006

Micro & Optical Tech Letters

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model is feasible and can be applied to design such kind of a CPW-fed antenna. Furthermore, as previously described in this study, varying the slot width s will significantly affect the resonant performance of the proposed antenna. Thus, in contrast to the effects of s to the impedance matching, the effects of the lumped elements of the equivalent circuit model to the impedance matching have also been investigated. The results were also plotted in Figure 8 and show that very little difference exists between the simulated and modeled data. Clearly, the effects of impedance matching caused from varying the slot width s can be closely represented by properly adjusting the values of the capacitance C p and resistance R p . This is vital for concluding that the proposed circuit model is accurate and adequate for design purposes and can therefore be used for understanding the basic radiation phenomena of such kind of slotted CPW-fed antennas. CONCLUSIONSA compact low-profile CPW-fed U-shaped patch monopole antenna suitable for use in the 5.8 GHz RFID system has been proposed and implemented. With the insert of a symmetrical folded slot to the patch, the proposed antenna can be designed to excite at 5.8 GHz band with good antenna characteristics but has only 15 ϫ 10 mm 2 in antenna size. The antenna is mechanically robust and easy to fabricate and integrate with the application-specific circuit. This design is not only suitable for use in the RFID systems but is also applicable to the WLAN 5.8 GHz communication systems. Except for presenting the simulated and measured results, an equivalent circuit model was also established and provided a physical insight to account for the impedance matching of this kind of antenna.

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Development of a multiwavelength Raman fiber laser based on phase-shifted fiber Bragg gratings for long-distance remote-sensing applications

Cited by 51 publications

References 8 publications

Effect of Rayleigh-scattering distributed feedback on multiwavelength Raman fiber laser generation

Effect of Rayleigh-scattering distributed feedback on multiwavelength Raman fiber laser generation

Experimental demonstration of mode structure in ultralong Raman fiber lasers

Cladding mode coupling suppression in hole‐assisted fiber BRAGG gratings

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