Semiconductor optical amplifiers (SOA) are optical amplifying devices and key parts in optical switches and optical buffers.They are largely used in communication system.Linewidth enhancement factor is an important pa...Semiconductor optical amplifiers (SOA) are optical amplifying devices and key parts in optical switches and optical buffers.They are largely used in communication system.Linewidth enhancement factor is an important parameter for SOA.A method is proposed to measure the linewidth enhancement factor with Sagnac interferometer.Cross phase modulation (XPM) and cross gain modulation (XGM) coexist in SOA.The quantitative relation of linewidth enhancement factor to XGM and the interference extinction ratio is given.The experimental results indicate that the value of linewidth enhancement factor changes from 5.13 to 6.24 when the electric current varies from 130 mA to 240 mA.展开更多
An S band and a C band distributed fiber Raman amplifiers (DFRAs) with flattened gain and compensated dispersion have been studied and implemented with 1427 nm and 1455 nm mono-wavelength fiber Raman lasers as the pum...An S band and a C band distributed fiber Raman amplifiers (DFRAs) with flattened gain and compensated dispersion have been studied and implemented with 1427 nm and 1455 nm mono-wavelength fiber Raman lasers as the pumped sourcesrespectively. The gain of single-wave pumped S band and C band can reach 10 dB and 15 dB respectively. And a 50 nmgain flattened width was successfully obtained by using a chirp fiber Bragg grating (CFBG) gain flattened filter with gainripple of ±0.6 dB. The C band DFRA has been applied to CDMA wireless communication system successfully.展开更多
The tunable microwave photonic filter based on a fiber ring and erbium-doped fiber amplifier （EDFA） was proposed. By introducing a section of erbium-doped fiber （EDF） into the fiber ring, the loss of the signal ca...The tunable microwave photonic filter based on a fiber ring and erbium-doped fiber amplifier （EDFA） was proposed. By introducing a section of erbium-doped fiber （EDF） into the fiber ring, the loss of the signal can be compensated by the EDFA gain through adjusting the pump power. This can largely increase the number of the effective sampling taps, and then improve the performance of the microwave photonic filter notably. When the pump power was set to be 42.7 roW, a microwave bandpass filter with the 3-dB bandwidth of 0.15 MHz, the Q factor up to 100 and extinction ratio up to 20 dB was achieved. By employing a tunable optical delay line in the above fiber ring, a tunable microwave photonic filter has been realized through tuning the length of the optical delay line. The proposed tunable microwave photonic filter can fred great applications in microwave signal processing and ROF system.展开更多
文摘Semiconductor optical amplifiers (SOA) are optical amplifying devices and key parts in optical switches and optical buffers.They are largely used in communication system.Linewidth enhancement factor is an important parameter for SOA.A method is proposed to measure the linewidth enhancement factor with Sagnac interferometer.Cross phase modulation (XPM) and cross gain modulation (XGM) coexist in SOA.The quantitative relation of linewidth enhancement factor to XGM and the interference extinction ratio is given.The experimental results indicate that the value of linewidth enhancement factor changes from 5.13 to 6.24 when the electric current varies from 130 mA to 240 mA.
基金This work was supported by Great Scientific Research Project ofZhejiang Province, China (No.021101558)a part of projectfunds of the Korea-China Optical Technology Research Center.
文摘An S band and a C band distributed fiber Raman amplifiers (DFRAs) with flattened gain and compensated dispersion have been studied and implemented with 1427 nm and 1455 nm mono-wavelength fiber Raman lasers as the pumped sourcesrespectively. The gain of single-wave pumped S band and C band can reach 10 dB and 15 dB respectively. And a 50 nmgain flattened width was successfully obtained by using a chirp fiber Bragg grating (CFBG) gain flattened filter with gainripple of ±0.6 dB. The C band DFRA has been applied to CDMA wireless communication system successfully.
基金supported by the Science Foundation of ZhejiangProvince, China (R104154)
文摘The tunable microwave photonic filter based on a fiber ring and erbium-doped fiber amplifier （EDFA） was proposed. By introducing a section of erbium-doped fiber （EDF） into the fiber ring, the loss of the signal can be compensated by the EDFA gain through adjusting the pump power. This can largely increase the number of the effective sampling taps, and then improve the performance of the microwave photonic filter notably. When the pump power was set to be 42.7 roW, a microwave bandpass filter with the 3-dB bandwidth of 0.15 MHz, the Q factor up to 100 and extinction ratio up to 20 dB was achieved. By employing a tunable optical delay line in the above fiber ring, a tunable microwave photonic filter has been realized through tuning the length of the optical delay line. The proposed tunable microwave photonic filter can fred great applications in microwave signal processing and ROF system.
