Abstract
We propose and experimentally demonstrate a new scheme for photonic generation of microwave frequency shift keying (FSK) signal by employing one single-drive Mach-Zehnder modulator (MZM). In the proposed method, an electrical signal with different radio frequency (RF) amplitudes and direct current (DC) components for bit '0' and bit '1' is generated. After amplification, the signal is fed into a single-drive MZM which is biased at the quadrature and null points of its transmission curve for bit '0' and bit '1', respectively. Due to the different RF amplitudes, a microwave FSK signal can be obtained after photodetection, where the space frequency is the same as the RF frequency and the mark frequency is twice as large as the RF frequency. The feasibility of the proposed scheme is verified by a proof-of-concept experiment. 5/10-GHz and 10/20-GHz microwave FSK signals with different bit rates are successfully demonstrated.
Highlights
Microwave photonics (MWP) utilizes photonic devices to generate and process microwave signals in optical field, which can overcome the bandwidth bottleneck of electrical components [1]
Microwave frequency shift keying (FSK) signal as a fundamental digital modulation format in wireless communication has rarely been realized through photonic technology
We propose and experimentally demonstrate photonic generation of microwave FSK signal using only one single-drive Mach–Zehnder modulator (MZM)
Summary
Microwave photonics (MWP) utilizes photonic devices to generate and process microwave signals in optical field, which can overcome the bandwidth bottleneck of electrical components [1]. Thanks to the intrinsic advantages of optical devices, photonic generation of microwave signal can reduce the system complexity and cost compared with radio frequency (RF) domain methods [2, 3]. Photonic generations of microwave signals with different modulation formats, including amplitude shift keying (ASK), phase shift keying (PSK), and high-order modulation formats, have attracted increasing attentions [6,7,8,9,10,11,12,13,14,15,16,17,18]. We propose and experimentally demonstrate photonic generation of microwave FSK signal using only one single-drive Mach–Zehnder modulator (MZM). Due to the different RF amplitudes and DC components for bit ‘0’ and bit ‘1’, a microwave FSK signal can be obtained after electrical-optical-electrical (EOE) conversion. A proof-of-concept experiment demonstrates the generation of 5/10-GHz and 10/20-GHz microwave FSK signals at different bit rates
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