Abstract
To accommodate the demand of exponentially increasing global wireless traffic driven by the coming beyond 5G and 6G, wireless communication has stepped into the millimeter wave (MMW) band to exploit large available bandwidth. The future wireless application scenarios require wireless communication systems with high speed, low cost, a small footprint and simple configuration, and the integrated light source-based intensity modulation and direct detection (IM-DD) photonic-wireless system can better meet the demand than the traditional system based on bulky components. In this paper, we experimentally demonstrate a lens-free pulse-amplitude-modulation with four levels (PAM-4) and discrete multi-tone with 16-quadrature amplitude modulation (DMT-16QAM) MMW photonic-wireless transmission system in the W-band using an integrated mode-locked laser (MLL) chip and a mixer-based receiver, which could be applicable for flexible wireless applications. The integrated MLL as an on-chip single light source is used to generate W-band signals and simplify the transmitter. The signal-to-noise ratio of the generated wireless signal is improved by two coherent optical carriers both modulated with data and then beating in the photodiode. In addition, we investigate the IM-DD configuration by employing an envelope detector (ED) to receive the PAM-4 signal for further simplifying the system. The ED-based photonic-wireless system is more suitable for the applications with lower data rate and low cost. For higher data rate, the mixer-based PAM-4/DMT-16QAM systems with up to 31.75 Gbit/s net data rate are more favorable, although the cost is also higher.
Highlights
We experimentally demonstrate a lens-free pulse-amplitude-modulation with four levels (PAM-4) and discrete multi-tone with 16-quadrature amplitude modulation (DMT-16QAM) MMW photonic-wireless transmission system in the W-band using an integrated mode-locked laser (MLL) chip and a mixer-based receiver, which could be applicable for flexible wireless applications
We report an experimental demonstration of a PAM-4/discrete multi-tone modulation (DMT)-16QAM photonic-wireless transmission system in the W-band based on a monolithically integrated mode-locked laser (MLL)
The optical spectra of the optical frequency comb (OFC) generated from the on-chip MLL and the two selected carriers modulated with PAM-4 signal are shown in Fig. 3(b) and (c)
Summary
To follow this trend, the ultrafast photonic-wireless network is foreseeable to play a key role in the future to face the exponentially increasing global wireless net data traffic [1]. Pulse-amplitude-modulation with four levels (PAM-4) and discrete multi-tone modulation (DMT) have been proposed for the IM-DD systems [18] and the PAM-4 can simplify the transmitter since it only requires a 2-bit digital-to-analog converter (DAC)
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