Md. Samiul Habib

Ultra-Low Material Loss and Dispersion Flattened Fiber for THz Transmission

This letter reports a photonic crystal fiber having ultralow material loss and near-zero dispersion at the telecom window which is suitable for THz wave guidance. The finite element method with perfectly matched layer circular boundary is used to investigate the guiding properties. The numerical results show that ultra-low material absorption loss of 0.056 cm-1 at 1.0 THz and nearly zero flattened dispersion of ±0.18 ps/THz/cm can be obtained from the proposed fiber in the wavelength range of 1.0-1.8 THz.

Design and Characterization of Highly Birefringent Residual Dispersion Compensating Photonic Crystal Fiber

A residual dispersion compensating octagonal photonic crystal fiber (OPCF), with an elliptical array of circular air-holes in the fiber core region, is proposed. The full-vector finite-element method with perfectly matched layer boundary is used as the analysis tool. It is demonstrated that it is possible to obtain large average negative dispersion of -562.52 ps/(nm · km) over 240 nm and -369.10 ps/(nm · km) over 630 nm wavelength bands for the fast and the slow axis, respectively. In addition to large negative dispersion, ultra-high birefringence, high nonlinearity, and zero-dispersion wavelengths with low confinement loss are also warranted. The proposed OPCFs would be a promising candidate for residual dispersion compensation, supercontinuum generation, and other applications.

Relative dispersion slope matched dispersion compensating highly birefringent spiral microstructure optical fibers using defected core

Abstract. A highly birefringent dispersion compensating microstructure optical fiber (MOF) based on a modified spiral (MS)-MOF is presented that successfully compensates the dispersion covering the E- to L-communication bands ranging from 1370 to 1640 nm. It is shown theoretically that it can obtain a negative dispersion coefficient of about −221 to −424  ps/(nm·km)) over S to L bands and −327  ps/(nm· km)) at the operating wavelength of 1550 nm. The relative dispersion slope is perfectly matched to that of single-mode fiber of about 0.0036  nm−1. Besides, the proposed MS-MOF offers high birefringence of 1.79×10−2 with a large nonlinear coefficient of about 41.8  W−1 km−1 at the operating wavelength along with two zero dispersion wavelengths at 610 and 1220 nm. Futhermore, the variation of structural parameters is also studied to evaluate the tolerance of the fabrication.

Tailoring polarization maintaining broadband residual dispersion compensating octagonal photonic crystal fibers

Abstract. We present a residual dispersion compensating highly birefringent photonic crystal fiber (PCF) based on an octagonal structure for broadband dispersion compensation in the wavelength range 1460–1625 nm. The finite element method with perfectly matched boundary condition is used as the numerical design tool. It has been shown theoretically that it is possible to obtain a negative dispersion coefficient of about −418 to −775  ps/nm/km over the S-, C-, and L-bands, relative dispersion slope (RDS) close to that of single mode fiber (SMF) of about 0.0036  nm−1 at 1550 nm. According to the simulation, birefringence of 2×10−2 is obtained at 1550-nm wavelength. The variation of structural parameters is also studied to evaluate the tolerance of the fabrication. The proposed octagonal PCF can be a potential candidate for residual dispersion compensation as well as maintaining single polarization in optical fiber transmission system.

Highly nonlinear polarization maintaining dispersion compensating fiber for high-speed transmission system

Abstract. A photonic crystal fiber design is presented, which has simultaneously ultra-high birefringence, high nonlinearity, and high negative dispersion. The relative dispersion slope matches with that of standard single-mode fiber of about 0.0036  nm−1. The finite element method with circular perfectly matched boundary layer is used to investigate the guiding properties. The proposed fiber ensures a large negative dispersion coefficient of about −639.16  ps/(nm km), birefringence of order 3.55×10−2, and nonlinear coefficient of 41  W−1 km−1 at 1550-nm wavelength.

A novel scaling down dispersion of microstructure optical fibers to near-zero value for broadband communication systems

This paper presents microstructure optical fiber (MOF) for tailoring nearly zero ultraflattened dispersion and low confinement losses in a wide range of wavelengths. The finite-element method with perfectly matched layers boundary condition is used to investigate the guiding properties. It has been shown theoretically that it is possible to obtain nearly zero ultraflattened dispersion of 0.35 ps/nm/km in a wavelength range of 1.30 to 1.65 μm with low confinement losses of the order less than 10-5 dB/km within the entire band of interest from a fivering MOF.

Design of microstructure optical fibers as broadband dispersion compensators

This paper presents a numerical design of a high negative dispersion microstructure optical fiber for dispersion compensation in a wide range of wavelengths. The finite-element method with perfectly matched absorbing layers boundary condition is used to investigate the guiding properties. The designed novel dispersion compensating fiber (DC-MOF) shows that it is possible to obtain a larger negative dispersion coefficient, better dispersion slope compensation, and lower confinement losses in the entire telecommunication (1400-1600 nm) band by using a modest number of design parameters and very simple cladding design.