Fully dispersion controlled triangular-core nonlinear photonic crystal fiber
23 Mar 2003-
TL;DR: In this article, the authors demonstrate the first nonlinear fiber where both dispersion level and slope can be fully controlled in a broad wavelength range while maintaining low loss and a high nonlinear coefficient.
Abstract: We demonstrate the first nonlinear fiber where both dispersion level and slope can be fully controlled in a broad wavelength range while maintaining low loss and a high nonlinear coefficient. Lowest slope obtained is l.10/sup -3/ps/(km.nm/sup 2/).
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TL;DR: In this paper, a 3-dB conversion range over 40 nm (1535-1575 nm) was obtained with a flat conversion efficiency of -16 dB and a polarization sensitivity of less than 0.3 dB using four-wave mixing in a 64-m-long dispersion-flattened nonlinear photonic crystal fiber.
Abstract: Polarization-insensitive widely tunable wavelength conversion has been demonstrated using four-wave mixing in a 64-m-long dispersion-flattened nonlinear photonic crystal fiber. A 3-dB conversion range over 40 nm (1535-1575 nm) is obtained with a flat conversion efficiency of -16 dB and a polarization sensitivity of less than 0.3 dB. The measured power penalty is less than 1 dB for a 10-Gb/s converted nonreturn-to-zero signal at 10/sup -9/ bit-error rate.
109 citations
Cites background from "Fully dispersion controlled triangu..."
...Since the structure of the PCF has a three-fold symmetry, there is very low inherent birefringence to the design [8] and, therefore, similar FWM effect is expected for both clockwise and counterclockwise propagating signals with orthogonal polarizations in the loop....
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TL;DR: In this article, a photonic crystal fiber (PCF) was designed to control chromatic dispersion for supercontinuum generation, which achieved low confinement loss and ultra-flattened near zero dispersion centered about λZD ~ 1325 nm.
Abstract: We propose a technique based on optofluidic infiltration to design a photonic crystal fiber (PCF) to control chromatic dispersion for supercontinuum generation. Selectively infiltrating the PCF air-holes with an optical fluid having an appropriate refractive index, we have achieved a PCF with low confinement loss and ultra-flattened near zero dispersion centered about λZD ~ 1325 nm, without a need for nano-scale geometrical tuning. Numerical simulations show that femto-second pulses, with center wavelengths within the range of 1250 nm ≤ λ0 ≤ 1625 nm, can generate relatively flat supercontinuum spectra as wide as 640 to 1180 nm, passing through a 250-mm long PCF whose dispersion profile is engineered via selective optofluidic infiltration. Simulations also show that optical fluid with refractive index of nF = 1.32 for input signals having the aforementioned range of wavelengths result in the widest flat supercontinua. This is attributed to the smallest corresponding effective mode area as well as the smallest and flat corresponding dispersion both of which enhance the PCF nonlinearities.
72 citations
TL;DR: In this paper, an approach for non-NRZ to return-to-zero (RZ) format conversion by spectral filtering of a cross phase modulation (XPM) broadened signal spectrum with a study of the polarization effect of XPM is described.
Abstract: All-optical modulation format conversion may be needed in future hybrid optical-time-division multiplexing (OTDM) and wavelength-division multiplexing (WDM) networks. This paper describes an approach for nonreturn-to-zero (NRZ) to return-to-zero (RZ) format conversion by spectral filtering of a cross phase modulation (XPM) broadened signal spectrum with a study of the polarization effect of XPM. Two configurations, single-pass and polarization diversified loop, are proposed to realize the all-optical format conversion, and to evaluate the polarization sensitivity of the proposed noninterferometric format conversion scheme by spectral filtering. Error-free operation is obtained for the format converted output.
60 citations
TL;DR: In this paper, a square-lattice photonic crystal fiber based on optofluidic infiltration technique is proposed for supercontinuum generation, without nano-scale variation in the geometry of the photonic fiber, ultra-flattened near zero dispersion centered about 1500 nm will be achieved.
Abstract: In this paper, a square-lattice photonic crystal fiber based on optofluidic infiltration technique is proposed for supercontinuum generation. Using this approach, without nano-scale variation in the geometry of the photonic crystal fiber, ultra-flattened near zero dispersion centered about 1500 nm will be achieved. By choosing the suitable refractive index of the liquid to infiltrate into the air-holes of the fiber, the supercontinuum will be generated for 50 fs input optical pulse of 1550 nm central wavelength with 20 kW peak power. We numerically demonstrate that this approach allows one to obtain more than two-octave spanning of supercontinuum from 800 to 2000 nm. The spectral slicing of this spectrum has also been proposed as a simple way to create multi-wavelength optical sources for dense wavelength division multiplexing.
46 citations
Cites methods from "Fully dispersion controlled triangu..."
...However, most of the proposed techniques, so far, are based on varying the PCF geometry; such as varying the circular air-hole diameter (d) [18, 19], the pitch size (Λ) of the periodic lattice [9], as well as the number of air-holes rings (N) surrounding the PCF core or even using ring-shaped air-holes [20]....
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TL;DR: In this paper, Wang et al. studied fluid infiltration approach and rod filling technique for dispersion engineering of a photonic crystal fiber composed of As2S3-Chalcogenide glass.
37 citations