We report an all-fiber high power,single frequency large-mode area （LMA） linearly polarized ytterbiumdoped fiber amplifiers （YDFA） module,which is based on the master oscillator multi-stage power amplifiers （MOPA...We report an all-fiber high power,single frequency large-mode area （LMA） linearly polarized ytterbiumdoped fiber amplifiers （YDFA） module,which is based on the master oscillator multi-stage power amplifiers （MOPA）.The maximum output power is 43.8 W at a wavelength of 1064 nm when 60-W launched pump light is coupled,with high slope efficiency of 88%,polarization extinction rate （PER） 17.2 dB and nearly diffraction-limited beam quality （M 2 1.1）.展开更多
This paper presents a VHF（30-300 MHz） RF programmable gain amplifier（PGA） with an adaptive phase correction technique.The proposed technique effectively mitigates phase errors over the VHF band,and the RFPGA as a ...This paper presents a VHF（30-300 MHz） RF programmable gain amplifier（PGA） with an adaptive phase correction technique.The proposed technique effectively mitigates phase errors over the VHF band,and the RFPGA as a whole satisfies all the specifications of the China mobile multimedia broadcasting VHF band applications.The RFPGA is implemented with a TSMC 0.25μm CMOS process.Measurement results reveal a gain range of around 61 dB,an ⅡP3 of-7 dBm at maximum gain,a power consumption of 10.2 mA at maximum gain,and a phase imbalance of less than 0.3 degrees.展开更多
基金supported by the National "863" Program of China (No.2008AA03Z405)the National Natural Science Foundation of China (No.60907045)
文摘We report an all-fiber high power,single frequency large-mode area （LMA） linearly polarized ytterbiumdoped fiber amplifiers （YDFA） module,which is based on the master oscillator multi-stage power amplifiers （MOPA）.The maximum output power is 43.8 W at a wavelength of 1064 nm when 60-W launched pump light is coupled,with high slope efficiency of 88%,polarization extinction rate （PER） 17.2 dB and nearly diffraction-limited beam quality （M 2 1.1）.
文摘This paper presents a VHF（30-300 MHz） RF programmable gain amplifier（PGA） with an adaptive phase correction technique.The proposed technique effectively mitigates phase errors over the VHF band,and the RFPGA as a whole satisfies all the specifications of the China mobile multimedia broadcasting VHF band applications.The RFPGA is implemented with a TSMC 0.25μm CMOS process.Measurement results reveal a gain range of around 61 dB,an ⅡP3 of-7 dBm at maximum gain,a power consumption of 10.2 mA at maximum gain,and a phase imbalance of less than 0.3 degrees.
