High Negative Chromatic Dispersion Research Articles

Design and Theoretical Analysis of Highly Negative Dispersion-Compensating Photonic Crystal Fibers with Multiple Zero-Dispersion Wavelengths

This paper presents a highly negative dispersion-compensating photonic crystal fiber (DC-PCF) with multiple zero dispersion wavelengths (ZDWs) within the telecommunication bands. The multiple ZDWs of the PCF may lead to high spectral densities than those of other PCFs with few ZDWs. The full-vectorial finite element method with a perfectly matched layer (PML) is used to investigate the optical properties of the PCFs. The numerical analysis shows that the proposed PCF, i.e., PCF (b), exhibits multiple ZDWS and also achieves a high negative chromatic dispersion of −15089.0 ps/nm·km at 1.55 μ m wavelength, with the multiple ZDWs occurring within the range from 0.8 to 2.0 μ m range. Other optical properties such as the confinement loss of 0.059 dB/km, the birefringence of 4.11 × 10 − 1 , the nonlinearity of 18.92 W − 1 k m − 1 , and a normalized frequency of 2.633 was also achieved at 1.55 μ m wavelength. These characteristics make the PCF suitable for high-speed, long-distance optical communication systems, optical sensing, soliton pulse transmission, and polarization-maintaining applications.

A theoretical investigation of a photonic crystal fibre with ultra-flattened chromatic dispersion with three zero crossing dispersion wavelengths

Abstract This paper presents a novel non-defective core photonic crystal fiber (PCF) which was found to produce three zero dispersion wavelength (ZDW), which may lead to a very powerful spectral densities compared to that of single or double ZDW PCFs. More so, the presented PCF design not only has the three ZDW achieved for the PCF, but also, been able to achieve a high negative chromatic dispersion (−220.39 ps/km.nm), and ultra-flatted chromatic dispersion of ±0.9 ps/km·nm within operating wavelength range of 1.53–1.8 μm. These characteristics may be helpful for applications in the fields of supercontinuum generation (SCG), soliton pulse transmission, and detecting or sensing and optical communication systems. The propagation properties of the proposed PCFs: effective index, confinement loss and chromatic dispersion, are well researched making use of full vectorial finite element method (FEM).

Novel large negative dispersion and tunable zero dispersion wavelength of photonic crystal fiber

The article describes a novel doped CS2 core photonic crystal fiber with high negative chromatic dispersion. The proposed design is simulated through a full-vector finite element method and anisotropic perfectly matched layers. The numerical results show that we can achieve a negative dispersion coefficient of −5600 ps/(nm km) almost at the wavelength of 1.55 μm by carefully adjusting the proposed PCF structure parameters. The proposed PCF may have great potential applications in dispersion compensating, optical parametric amplification, and optical fiber communication.

Ultraflattened high negative chromatic dispersion over O+E+S+C+L+U bands of a microstructured optical fiber

This paper presents a large negative flattened dispersion with high birefringence for a very wide wavelength range by designing a new high index lead silicate (SF57) soft glass equiangular decagonal spiral microstructured optical fiber (DS-MOF). The bandwidth supports the second and third windows covering the O+E+S+C+L+U bands in the infrared region. The guiding properties of the DS-MOF are investigated by the finite-element method with a perfectly matched layer boundary. The proposed design is a suitable candidate for the application of residual dispersion compensation with maintaining polarization characteristics since it offers a high negative flattened dispersion of −(453 ± 7) ps⋅nm −1 km −1 with a high birefringence of the order 10 −2 for the wide wavelength range of 1.15 to 1.75 μ m. The DS-MOF has some circular air holes that make the fabrication process simple. In addition, the effects of changing the structural parameters by up to ±4% are also analyzed to ensure the accuracy during the fabrication process.

Tunable dual-core liquid-filled photonic crystal fibers for dispersion compensation

We have theoretically investigated the dispersion characteristics of dispersion compensating fibers based on dual-core liquid-filled PCFs. A very high negative chromatic dispersion value D = -19000 ps/(nm-km) can be achieved at 1.55-microm wavelength by an appropriate design. By varying the geometry of the PCF and the index of the filling liquid, the phase-matching wavelength and dispersion values are shown to be well tuned to desired values. The proposed structure also demonstrates good tunable properties with operation temperature for optical communication systems.

Design of dispersion-compensating fibers based on a dual-concentric-core photonic crystal fiber

A photonic crystal fiber based on a particular periodic arrangement of airholes and pure silica is designed for chromatic dispersion compensation. A two-concentric-core structure is obtained by introducing two different sizes of capillaries (for the airholes) and exhibits very high negative chromatic dispersion [-2200 ps/(nm km) at 1550 nm]. The variation of optogeometric parameters is also investigated to evaluate the tolerance of the fabrication. Finally, the bending influence on the modal characteristics shows that it is possible to tune the phase-matching wavelength over the C band by adjusting the diameter of the fiber.

Conception and characterization of a dual-concentric-core erbium-doped dispersion-compensating fiber.

We present an erbium-doped dispersion-compensating fiber made up of two asymmetric concentric cores, inner and outer matched claddings, and erbium located in the central core only. We demonstrate a high negative chromatic dispersion value [-700 ps/(nm km) at 1568 nm], significant modification of the gain spectrum compared with that of a classic erbium-doped fiber amplifier, and 30-dB peak small-signal gain at 1535 and 1553 nm.

Dispersion properties of photonic crystal fibers

AbstractThe dispersion properties of silica‐based photonic crystal fibers (PCFs) are analyzed to obtain: (i) zero dispersion at any wavelength, (ii) nearly zero ultraflattened dispersion, and (iii) a very high negative chromatic dispersion for various designs of PCFs. The influence of normalized air hole size on zero dispersion wavelength is also reported. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 129–132, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10845

Conception, Realization, and Characterization of a Very High Negative Chromatic Dispersion Fiber

After a brief presentation of many possible solutions usable to control or compensate the chromatic dispersion of optical links, we report the simulation, realization, and characterization of a dual asymmetric core dispersion compensating optical fiber. The simulation stage, using a cylindrical coordinates B.P.M., determines the optimized refractive index profile of the dispersion compensating fiber (DCF) including the optogeometrical tolerances, like the effect of the central index dip obtained by MCVD process. The realized fiber is characterized by phase shift method to measure its chromatic dispersion. The dispersion coefficient was measured to be −1800 ps/(nm·km) in the 1.55-μm low-loss window. A study of the propagation behavior and measurements of connection, propagation, and bending losses of this fiber are also presented.

Design of a high negative chromatic dispersion in a single mode optical fibre: effect of the central index dip

In this paper, we present the simulation results, using a cylindrical coordinates beam propagation method, of the effect of the central index dip in an optical fibre with high negative chromatic dispersion at 1.55 μm. This leads to the definition of an equivalent core area dependence of the position and the amplitude of the negative chromatic dispersion value achieved using such fibre geometry.

–1800 ps/(nm.km) chromatic dispersion at 1.55 [micro sign]m in dual concentric core fibre

A single-mode optical fibre exhibiting a very high negative chromatic dispersion (1800 ps/(nm.km)) at 1.5 /spl mu/m is realised and characterised for dispersion compensation applications.