A novel and simple numerical method for finding the best thin-film structures for third-order dispersion compensation has been achieved. A target third-order dispersion value is specified first; then the multilayer thin-film structure is optimized to have a second-order dispersion spectrum, which has the least deviation from linearity and has a slope that equals the specified third-order disper...

A photonic crystal fiber is optimized for chromatic dispersion compensation by using inner cladding modes. To this end, a photonic-oriented version of the downhill-simplex algorithm is employed. The numerical results show a dispersion profile that accurately compensates the targeted dispersion curve, as well as its dispersion slope. The presented fiber has a simple structure, while radiation lo...

We present a microstructure-based dual-core dispersion-compensating fiber (DCF) design for dispersion compensation in long-haul optical communication links. The design has been conceptualized by combining the all-solid dual-core DCF and dispersion-compensating photonic crystal fiber. The fiber design has been analyzed numerically by using a full vectorial finite difference time domain method. W...

The optical signals degrade as travel down the optical link due to the optical fiber properties such as chromatic dispersion, polarization mode dispersion, polarization dependent loss, polarization dependent gain and various fiber nonlinear effects, which are considered as limitations in the high-speed, lang-haul fiber communication systems. Where chromatic dispersion causes different wavelengt...

Laser-scanning microscopy (LSM) commonly employs galvanometer-driven mirrors for beam steering. To achieve frame rates sufficient to capture time-dependent signals in functional imaging applications, these inertia-limited components often restrict scan patterns to line-scans. This has several disadvantages: 1) frame rates are limited to ~100Hz, despite the sacrifice of one scan dimension; 2) si...

A dispersion-shifted fiber (DSF) is designed to have its zero dispersion wavelength in 1.55μm wavelength range. Since the dispersion of DSF is close to zero in the C-band, conditions for dense wavelength division multiplexing (DWDM) transmission using DSF are limited due to four wave mixing (FWM). In the L-band, however, the DSF has some dispersion values, so that the DWDM transmission using DS...

Introduction: Tunable dispersion compensation is becoming inevitable for fibre-optic communication systems. Important applications include replacing conventional dispersion compensating fibres (DCFs) in long-haul transmissions, compensating residual dispersion after the DCF to meet the tight dispersion tolerances required in 40 Gbit=s and above based networks, and compensating thermallyinduced ...

Dispersion is widely existed in the optical fiber. The reason is various, such as material dispersion, waveguide dispersion, mode dispersion, and so on. It will lead to the signal waveform distortion and pulse broadening and then limit the transmission capacity and bandwidth in the optical fiber. With the rapid development, transmission rate can reach even hundreds of Gb/s, and it may lead to m...

A new technique for maintaining high contrast in an atom interferometer is used to measure large de Broglie wave phase shifts. Dependence of an interaction induced phase on the atoms' velocity is compensated by applying an engineered counterphase. The counterphase is equivalent to a rotation, is precisely determined by a frequency, and can be used to measure phase shifts due to interactions of ...

The topic of thesis is “Compensation of Polarization Mode Dispersion (PMD)” in Fiber optics communication and its impact on high speed data transmission. The work can be divided into three parts which deals with major aspects of PMD: characteristics, transmission and compensation. Polarization-mode dispersion (PMD), in single-mode optical fibers, is a phenomenon that a limit the bit-rate-distan...