Liu Chengxiang

High-Stability Superfluorescent Fiber Source Based on an Er3+-Doped Photonic Crystal Fiber

A superfluorescent fiber source (SFS) based on an Er3+-doped photonic crystal fiber (EDPCF) is reported. Owing to the temperature insensitivity of the EDPCF, we show that it is possible to improve the mean wavelength stability of an SFS. Using single-backward configuration, the EDPCF SFS mean wavelength variation at temperatures from −40°C to 60°C is less than 100 ppm, indicating that the thermal coefficient of the EDPCF is smaller than 1 ppm/°C and 3–6 times smaller than those of two conventional Er3+-doped fibers under the same experimental conditions. The best performance of the EDPCF-based SFS is obtained between 0°C and 60°C, at which the change in the mean wavelength is only 17.445 ppm.

Design of Automatic Temperature Control System on Laser Diode of Erbium-Doped Fiber Source

Designed an automatic temperature control (ATC) system to arise the stability of laser diode (LD). Established a mathematical model of thermoelectric cooler (TEC) based on the peltier cooling principle. Simulated ATC by MATLAB and analyzed on the simulation results. Designed ATC circuit driver of the TEC of LD. Obtain high speed and high precision ATC system in the room temperature environment. Its temperature precision is lower than 0.1%.

High Power Photonic Crystal Fibre Raman Laser

A cw Raman laser based on a 100-m photonic crystal fibre is demonstrated with up to 3.8 W output power at the incident pump power of 12 W, corresponding to an optical-to-optical efficiency of about 31.6%. The second order Stokes light, which is firstly reported in a cw photonic crystal fibre Raman laser, is obtained at 1183 nm with an output power of 1.6 W and a slope efficiency of about 45.7%.

Spectral Broadening in a Polarization-Maintaining Photonic Crystal Fibre by Femtosecond Pulses from an Optical Parametric Amplifier

The spectral broadening with the bandwidth of 83 nm (1.2486–1.3318 μm) in the 1.3 μm region is achieved in a 0.2-m-long, polarization-maintaining photonic crystal fibre (PCF) with an average core radius of 1.8 μm, pumped by optical pulses at the wavelength 1.269 μm, with the duration 250 fs and the repetition rate 250 kHz from an optical parametric amplifier. The polarization characteristics of the output spectra are also investigated.

A Low-Pump-Threshold Photonic Crystal Fibre Raman Laser

We investigate a photonic crystal fibre Raman laser using fibre Bragg grating pairs as cavity mirrors. The threshold pump power is up to 0.65 W by decreasing the cavity loss and using a photonic crystal fibre with high Raman gain coefficient. A maximum continuous-wave output power of 2.7 W is obtained at the maximum incident pump power of 5.6 W. The corresponding optical conversion efficiency and the slope efficiency are about 48% and 56%, respectively.