Abstract
A novel photonic vector THz-wave signal generation at terahertz-wave (THz-wave) band by Mach Zendell modulator (MZM) -based optical frequency comb and in-phase and quadrature (IQ) modulator for signal modulation scheme is proposed. And we demonstrate 16 quadrature-amplitude-modulation (QAM) vector THz-wave signal generation and transmission by simulation. The IQ modulator is driven by a 2-Gbaud/3-Gbaud 16-QAM-modulated baseband signal.The MZM is driven by a radio frequency signal at the frequency of 30 GHz to generate optical frequency comb. The generated 390 GHz THz-wave radio frequency signal after heterodyne beating in uni-travelling photodiode (UTC-PD) is transmitted over 0 km/10 km single-mode-fiber transmission. The 390-GHz electrical vector THz-wave signal carring 16-QAM modulation can be generated with a bit error ratio (BER) of less than the hard-decision forward-error-correction (HD-FEC) threshold of 3.8e-3. To the best of our knowledge, it's the first time to generate 390 GHz photonic vector THz-wave signal on the basis of simple MZM-based optical frequency comb.
Highlights
There has been ever-growing research interest in the ultlization of THz-band (300 GHz – 500 GHz) with huge bandwidth available and vector signal modulation with high spectral efficiency in optical fiber-wireless seamless networks to meet the needs of emerging high capacity mobile communication [1]–[8]
The in-phase and quadrature (IQ) modulator is driven by a 2-Gbaud/3-Gbaud 16-QAMmodulated baseband signal.The Mach Zendell modulator (MZM) is driven by a radio frequency signal at the frequency of 30 GHz to generate optical frequency comb
The generated 390 GHz THz-wave radio frequency signal after heterodyne beating in unitravelling carrier photodiode (UTC-PD) is transmitted over 10 km single-mode-fiber distance
Summary
There has been ever-growing research interest in the ultlization of THz-band (300 GHz – 500 GHz) with huge bandwidth available and vector signal modulation with high spectral efficiency in optical fiber-wireless seamless networks to meet the needs of emerging high capacity mobile communication [1]–[8]. Photonic vector THz-wave signal generation is turning into a prospective technique, which can produce high quality and tunable radio frequency carriers in the spectral region with large bandwidth available for wideband communication. Employing optical heterodyne beating of two independent free running lasers is the major method to produce photonic vector THz-wave signal, which has huge merits of simplifying transmitter structure design and get radio frequency carrier tuned and frequency assignment [18]–[26]. To the best of our knowledge, it’s the first time to generate 390 GHz THz-wave vector signal on the basis of optical frequency comb using only one single MZM
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