− We propose ultra stable coherent laser sources based on optical injection locked single mode of the femtosecond fiber laser comb. The source is discretely tunable coherent optical sources by two DFB lasers, which are injection-locked to a respective single mode of the fiber laser comb with the frequency difference of 500 MHz, that is exactly twice of the comb repetition frequency.

A theoretical model is developed to describe the propagation of ultra-short optical pulses in fiber transmission systems in the quasi-linear regime, with periodically inserted in-line lumped nonlinear optical devices. Stable autosoliton solutions are obtained for a particular application of the general theory.

An efficient optical signal regenerator can mitigate the effect of signal degradation and increase the performance of optical communication system. All optical signal regenerators have been studied and developed for maintaining good quality signal in long haul optical communication. Fiber nonlinearity has some inherent properties for signal regeneration and it has an enormous potential for ultr...

Simulations of ultra-long (10 mm) semiconductor optical amplifier’s induced optical chirp (cross-phase modulation), with posterior conversion to amplitude modulation by proper filtering, show promising results for wavelength conversion with pulse re-amplifying and re-shaping in 10 Gbps and 20 Gbps. The dependences on filter bandwidth and optical input power (high, medium and low levels) are ana...

The manipulation of dynamic Brillouin gratings in optical fibers is demonstrated to be an extremely flexible technique to achieve, with a single experimental setup, several all-optical signal processing functions. In particular, all-optical time differentiation, time integration and true time reversal are theoretically predicted, and then numerically and experimentally demonstrated. The techniq...

Since the internet traffic is rapidly growing, it is expected that the current transmission fibers will become inadequate in around 2015–2020 [1], [2]. Therefore, some innovations with transmission fibers for future high-capacity transmission have been strongly required. Expanding the transmission bands from the current C and/or L-Band by utilizing new transmission fibers is one interesting dir...

We report the first observation of a non-dipole transition in an ultra-cold atomic vapor. We excite the 3P-4P electric quadrupole (E2) transition in Na confined in a Magneto-Optical Trap(MOT), and demonstrate its application to high-resolution spectroscopy by making the first measurement of the hyperfine structure of the 4P1/2 level and extracting the magnetic dipole constant A = 30.6 ± 0.1 MHz...

Abstract With the increasing need for large volumes of data processing, transport, and storage, optimizing trade-off between high-speed energy consumption in today’s optoelectronic devices is getting increasingly difficult. Heterogeneous material integration into silicon- nitride-based photonics has showed promise, albeit at expense millimeter-to centimeter-scale footprints. The hunt an electro...