In this Letter,we report on widely tunable pulse generation from a red-diode-clad-pumped mid-infrared[mid-IR)Er^(3+)/Dy^(3+)codoped ZrF_(4)fiber laser,for the first time,to the best of our knowledge.Using a Fe^(2+):Zn...In this Letter,we report on widely tunable pulse generation from a red-diode-clad-pumped mid-infrared[mid-IR)Er^(3+)/Dy^(3+)codoped ZrF_(4)fiber laser,for the first time,to the best of our knowledge.Using a Fe^(2+):ZnSe crystal,continuously tunable Qswitched pulses across the range of 3.06–3.62μm have been attained,which not only represents the widest range[in wavelength domain)from a pulsed rare-earth-doped fiber laser at any wavelength,but also almost entirely covers the strong absorption band of C-H bonds in the mid-IR,providing a potential way for gas detection and polymer processing.In addition,the commercial InAs quantum-well-based saturable absorbers[SAs)have been employed instead,and the obtained longest Q-switching wavelength of 3.39μm is slightly shorter than 3.444μm determined by its nominal direct bandgap of 0.36 eV.展开更多
This paper presents a continuously and widely tunable analog baseband chain with a digital-assisted calibration scheme implemented on a 0.13μm CMOS technology.The analog baseband is compliant with several digital bro...This paper presents a continuously and widely tunable analog baseband chain with a digital-assisted calibration scheme implemented on a 0.13μm CMOS technology.The analog baseband is compliant with several digital broadcasting system（DBS） standards,including DVB-S,DVB-S2,and ABS-S.The cut-off frequency of the baseband circuit can be changed continuously from 4.5 to 32 MHz.The gain adjustment range is from 6 to 55.5 dB with 0.5 dB step.The calibration includes automatic frequency tuning（AFT） and automatic DC offset calibration （DCOC） to achieve less than 6%cut-off frequency deviation and 3 mV residual output offset.The out-of-band IIP2 and IIP3 of the overall chain are 45 dBm and 18 dBm respectively,while the input referred noise（IRN） is 17.4 nV/√Hz.All circuit blocks are operated at 2.8 V from LDO and consume current of 20.4 mA in the receiving mode.展开更多
A couple of simple-structure phase modulators were used in active mode-locked fiber laser to implement repetition rate continuous tuning. The laser produces pulse as short as 5.7 ps whose repetition rate tuning can co...A couple of simple-structure phase modulators were used in active mode-locked fiber laser to implement repetition rate continuous tuning. The laser produces pulse as short as 5.7 ps whose repetition rate tuning can cover the spacing of the adjoining order mode-locking frequencies.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(No.62005040)the Fundamental Research Funds for the Central Universities(No.ZYGX2020KYQD003)the Science and Technology Project of Sichuan Province(No.2021YJ0368)。
文摘In this Letter,we report on widely tunable pulse generation from a red-diode-clad-pumped mid-infrared[mid-IR)Er^(3+)/Dy^(3+)codoped ZrF_(4)fiber laser,for the first time,to the best of our knowledge.Using a Fe^(2+):ZnSe crystal,continuously tunable Qswitched pulses across the range of 3.06–3.62μm have been attained,which not only represents the widest range[in wavelength domain)from a pulsed rare-earth-doped fiber laser at any wavelength,but also almost entirely covers the strong absorption band of C-H bonds in the mid-IR,providing a potential way for gas detection and polymer processing.In addition,the commercial InAs quantum-well-based saturable absorbers[SAs)have been employed instead,and the obtained longest Q-switching wavelength of 3.39μm is slightly shorter than 3.444μm determined by its nominal direct bandgap of 0.36 eV.
基金supported by the National Natural Science Foundation of China(Nos.61176093,51072171)
文摘This paper presents a continuously and widely tunable analog baseband chain with a digital-assisted calibration scheme implemented on a 0.13μm CMOS technology.The analog baseband is compliant with several digital broadcasting system（DBS） standards,including DVB-S,DVB-S2,and ABS-S.The cut-off frequency of the baseband circuit can be changed continuously from 4.5 to 32 MHz.The gain adjustment range is from 6 to 55.5 dB with 0.5 dB step.The calibration includes automatic frequency tuning（AFT） and automatic DC offset calibration （DCOC） to achieve less than 6%cut-off frequency deviation and 3 mV residual output offset.The out-of-band IIP2 and IIP3 of the overall chain are 45 dBm and 18 dBm respectively,while the input referred noise（IRN） is 17.4 nV/√Hz.All circuit blocks are operated at 2.8 V from LDO and consume current of 20.4 mA in the receiving mode.
文摘A couple of simple-structure phase modulators were used in active mode-locked fiber laser to implement repetition rate continuous tuning. The laser produces pulse as short as 5.7 ps whose repetition rate tuning can cover the spacing of the adjoining order mode-locking frequencies.
