In order to suppress transient excursion of output signal,a novel scheme to modify the edge waveform of pulse signal is proposed,and transient response to a signal with slowly changed leading-edge is investigated,which is based on the finite-difference algorithm to simulate four-level rate-propagation equations of new-type broad-band tellurite-based erbium-doped fiber amplifier (EDTFA).

As we know, the intrinsic gain spectrum characteristics of broadband tellurite-based fiber amplifier (EDTFA) is not flat, so we designed a kind of dual-stage structure with a gain equalization filter between fibers.

Based on the rate equations and light propagation equations of four energy level system, the performances of gain and noise figure of broadband erbium-doped tellurite fiber amplifier(EDTFA) with an isolator in the midway are researched.

The processing of backward amplified spontaneous emission in a bismuth-based erbium-doped fiber amplifier;

Design of EDFA gain flattening filter using cascaded M-Z interferometer;

Study on noise figure and gain of EDFA;

A Wideband Amplifier Combining FRA with EDFA;

Gain and noise figure improvement of the reflection L-band erbium-doped fiber amplifier;

A novel Erbium-doped fiber amplifier(EDFA) pumped by 980 nm LD that improves the L-band amplification performances is demonstrated.

In the power telecom networks, the distance between two nodes is always too long to use the normal optical transceiver, so we have to use Erbium-Doped Fiber Amplifier (EDFA) additionally.