Title :
Spectral Power Enhancement in a 100 GHz Photonic Millimeter-Wave Generator Enabled by Spectral Line-by-Line Pulse Shaping
Author :
Kuo, F.-M. ; Shi, J.-W. ; Chiang, H.-C. ; Chuang, H.-P. ; Chiou, H.-K. ; Pan, C.-L. ; Chen, N.-W. ; Tsai, H.-J. ; Huang, C.-B.
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Taoyuan, Taiwan
Abstract :
We report generation of high-modulation-depth photonic millimeter-wave (MMW) waveforms by applying line-by-line pulse shaping on a phase-modulated continuous-wave frequency comb. The optimized 20 and 100 GHz optical waveforms are then converted into electrical MMW signals using a near-ballistic uni-traveling-carrier photodiode (NBUTC-PD). A 7.4 dB MMW power enhancement is experimentally achieved by using 2.6 ps optimized pulses at a 100 GHz repetition rate, as compared with excitation by a conventional sinusoidal signal for the NBUTC-PD operated at the same photocurrent. This is in qualitative agreement with a theoretical analysis of spectral power enhancement by optical short pulses comprised of equi-amplitude frequency lines over sinusoidal excitation.
Keywords :
microwave photonics; millimetre wave generation; optical modulation; optical pulse shaping; photodiodes; electrical millimeter wave signal; equi amplitude frequency lines; frequency 100 GHz; frequency 20 GHz; gain 7.4 dB; near ballistic unitraveling carrier photodiode; optical short pulse; optical waveforms; phase modulated continuous wave frequency comb; photonic millimeter wave generator; sinusoidal excitation; spectral line-by-line pulse shaping; spectral power enhancement; time 2.6 ps; Frequency; Optical pulse generation; Optical pulse shaping; Optical pulses; Photoconductivity; Photodiodes; Power generation; Pulse generation; Pulse shaping methods; Spectral analysis; Microwave photonics signal; optical communications; photodetectors; pulse shaping;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2010.2064160
