Photonic Generation and Application of a Bandwidth Multiplied Linearly Chirped Signal With Phase Modulation Capability

Abstract

Photonic generation of a bandwidth multiplied linearly chirped signal with phase modulation capability is proposed and its applications in communication and radar systems are demonstrated. In the generator, a dual-polarization quadrature phase shift keying modulator is used to simultaneously perform bandwidth multiplication and phase modulation. The generator can be functionally expanded to a transceiver for wireless communication, which can be used to perform optical generation and coherent demodulation of a phase modulated linearly chirped signal. Meanwhile, the generator can be used to increase the radar detection distance by improving the signal time bandwidth product. The signal generation and application are verified by simulation. A linearly chirped signal with an instantaneous frequency of 8-12 GHz or 16-24 GHz is obtained by using a 4-6 GHz electrical driving signal. The proposed transceiver is demonstrated to perform 156.25-bit/s wireless communication. When the emitting power is 11 dBm and the communication distance is 1 km, the bit error rate can be better than 10 -4 . While for radar detection, the peak to sidelobe ratio of the compressed pulse is increased from 1.1 dB to 9.2 dB, through which the distance improvement can be verified.

Photonic integrated wireless communication and sensing with OFDM modulation

“…Previously, Nie et al demonstrated a photonic system by superposing amplitude shift keying (ASK) modulation to a linear frequency modulation (LFM) signal by simply adding a Mach-Zehnder Modulator (MZM) to a photonic radar system [10]. Li et al proposed a similar optical system by using linear frequency modulation and phase shift keying (LFM-PSK) for sensing and communication [11]. It has been demonstrated that microwave photonic systems possess a wide bandwidth to uphold a high data rate [12].…”

Photonic generation of frequency agile LFM signals for ISAC systems

“…Many schemes of photonic-aid LFM-based shared waveform generation has been proposed over the past pentad [7][8][9][10][11][12][13][14][15][16]. In 2019, an amplitude shift keying (ASK)-LFM waveform with a 4 GHz bandwidth and a data rate of 100 Mbps was realized via photonic approach for the first time [7].…”

“…However, these schemes employed inter-pulse coding, resulting in a low bit rate dictated by the pulse repetitive frequency (PRF) of radar. On the other hand, numerous efforts on photonic generation of PSK-LFM waveforms have been made [9][10][11][12][13][14][15]. By employing inner-pulse modulation, variable phase deviation, pseudo-random coding, and phase compensation, the mutual interference between sensing and communication functions was significantly mitigated, leading to enhanced overall performance.…”

Photonic generation and application of dual-band phase-coded LFM signals

“…However, the complexity of the OEO and the limited oscillating modes hinder the precision of the generated LFM signal. Recently, we proposed a frequency multiplied phase-coded LFM signal generator based on a DPol-DPMZM [28] . Bandwidth doubled or quadrupled LFM waveform can be obtained and be used for radar detection and covert communication.…”