Optical Amplifiers are essentials components in long haul fibre optic system. An amplifier is a electronic device that can increase the power of signal. An Optical Amplifier is effectively the opposite of attenuator while Optical Amplifiers provide gain and attenuator provides loss. When a signal travels in a optical fibre medium the signal suffer from various losses such as fibre losses, atten...

A receiver for optical frequency modulated signals, based on colorless demodulation and detection, is presented. An integrated combination of semiconductor optical amplifier (SOA) and reflective electroabsorption modulator (REAM) is designed to obtain a comb-like spectral detection function, replacing the typically required costly frequency discrimination filter. The spectral properties of the ...

In new optical pulse generator using delayedinterference-signal-wavelength-converter (DISC)-type all-optical gate, we injected sinusoidally modulated light to ring cavity. With this way, externally modulated laser oscillation and mode-locked pulse laser oscillation occurred. These generated pulse’s widths and repetition frequencies are 27 ps, 10.5 GHz and 2.1 ps, 10.5 GHz, respectively. Keyword...

Optical network based on wavelength-division-multiplexing (WDM) technology will be a most active research topic in the 21st century. This paper describes a WDM multiple-wavelength transmitter and several key corresponding devices for optical network, including ASE spectrum-sliced multiplewavelength optical source, optical add/drop multiplexer (OADM), semiconductor optical amplifier (SOA), as we...

In this paper, based on the coupled-mode and carrier rate equations, derivation of a dynamic model and numerically analysis of a MQW chirped DFB-SOA all-optical flip-flop is done precisely. We have analyzed the effects of strains of QW and MQW and cross phase modulation (XPM) on the dynamic response, and rise and fall times of the DFB-SOA all optical flip flop. We have shown that strained MQW a...

Gain Clamped Semiconductor Optical Amplifier (GC-SOA), All Optical flip flop (AOff), Distributed bragg reflector (DBR), bistability property ABSTRACT In this article, the effect of coupling coefficient variations on an all optical Flip Flop performance based on gain clamped semiconductor optical amplifier according to distributed bragg reflectors by extensive band model of wave diffusion in tim...

A single-chip photocurrent-driven wavelength converter operating at 10 Gbit=s is presented. The device consists of a monolithically integrated widely tunable transmitter and an optical receiver. The transmitter consists of a sampled grating DBR laser, electroabsorption modulator and semiconductor optical amplifier (SOA). The optical receiver includes a quantum-well pin photodetector and a set o...

For the need of higher capacity and speed, optical fiber communication system is being extensively used all over the world for telecommunication, video and data transmission purposes. Optical communication systems are employed in order to meet the challenge of high bandwidth but signal attenuation is the major limitation. Electronic regeneration of signal is used to overcome the problem but it ...

We study the limiting-amplification capability of a saturated Semiconductor Optical Amplifier (SOA) followed by an optical band-pass filter. We experimentally demonstrate that this simple optical circuit can be effectively exploited to realize a low-power optical limiter for amplitude-modulated pulse trains at multi-GHz repetition rate. We report very large amplitude-modulation-reduction factor...

We present recent advances in multi-wavelength, power-equalized laser sources that incorporate a semiconductor optical amplifier (SOA) and simple optical filters, such as Lyot-type and Fabry-Perot, for comb generation. Both linear and ring-cavity configurations are presented, and single-pass optical feedback technique is proposed to improve the performance in terms of the number of simultaneous...