A novel scheme for ultra-wideband（UWB） monocycle pulse generation is proposed based on a dual-output push-pull Mach-Zehnder modulator（MZM）.The MZM is driven by a non-return-to-zero（NRZ） data sequence and biased ...A novel scheme for ultra-wideband（UWB） monocycle pulse generation is proposed based on a dual-output push-pull Mach-Zehnder modulator（MZM）.The MZM is driven by a non-return-to-zero（NRZ） data sequence and biased at the nonlinear point to generate edge-triggered pulses.To combine the complementary pulses forming a monocycle UWB pulse,two schemes are used to implement incoherent summation structure. A proof-of-concept experiment of UWB-over-fiber down-link system is set up.Further,by using digital signal processing（DSP） to calculate the bit error rate（BER）,the transmission performance of two system configurations is studied.展开更多
A novel method to generate binary frequency shift-keying(BFSK) radio frequency(RF) signals in optical domain is proposed.In the proposed system,an optical short pulse train is converted into super-Gaussian RF pulses w...A novel method to generate binary frequency shift-keying(BFSK) radio frequency(RF) signals in optical domain is proposed.In the proposed system,an optical short pulse train is converted into super-Gaussian RF pulses with high frequency based on optical pulse shaping by two Mach-Zehnder fiber interferometers(MZIs).And the generated RF signals are coded using a fast electro-optic switch.By properly designing the MZIs,BFSK RF signals with desired code pattern and modulation index can be generated.A theoretical model for describing the system is developed,and the generation of BFSK RF signals in millimeter-wave regime is demonstrated via simulations.展开更多
基金supported in part by the National Natural Science Foundation of China(No.60736003)the National"863"Project of China(Nos.2009AA01Z222 and 2007AA01Z256)+1 种基金the National"973"Project of China (No.2006CB302805)the Project iCHIP financed by the Italian Ministry of Foreign Affairs.
文摘A novel scheme for ultra-wideband（UWB） monocycle pulse generation is proposed based on a dual-output push-pull Mach-Zehnder modulator（MZM）.The MZM is driven by a non-return-to-zero（NRZ） data sequence and biased at the nonlinear point to generate edge-triggered pulses.To combine the complementary pulses forming a monocycle UWB pulse,two schemes are used to implement incoherent summation structure. A proof-of-concept experiment of UWB-over-fiber down-link system is set up.Further,by using digital signal processing（DSP） to calculate the bit error rate（BER）,the transmission performance of two system configurations is studied.
基金supported by the National Natural Science Foundation of China (No. 61032005)the Postdoctoral Science Foundation under Grant of China (No.2012M510442)
文摘A novel method to generate binary frequency shift-keying(BFSK) radio frequency(RF) signals in optical domain is proposed.In the proposed system,an optical short pulse train is converted into super-Gaussian RF pulses with high frequency based on optical pulse shaping by two Mach-Zehnder fiber interferometers(MZIs).And the generated RF signals are coded using a fast electro-optic switch.By properly designing the MZIs,BFSK RF signals with desired code pattern and modulation index can be generated.A theoretical model for describing the system is developed,and the generation of BFSK RF signals in millimeter-wave regime is demonstrated via simulations.
