Low-cost wide tunable high-frequency optical millimeter wave/submillimeter wave signal generation device and method based on phase modulation

Abstract

The invention discloses a low-cost wide tunable high-frequency optical millimeter wave / submillimeter wave signal generation device and method based on phase modulation, and belongs to the field of optical millimeter wave generation in a radio over fiber (ROF) communication system. A binary phase shift keying (BPSK) signal is up-converted into a BPSK radio-frequency signal through an electric mixer to be used for driving a phase modulator, a continuous optical carrier is modulated, an odd-order sideband carrying the BPSK signal and an even-order sideband not carrying the BPSK signal are generated by reasonably setting a modulation index of the phase modulator, and the BPSK radio-frequency signal is converted into a BPSK radio-frequency signal. The method comprises the following steps: extracting a-4-order sideband and a + 3-order sideband by using an optical cross multiplexer, sending the-4-order sideband and the + 3-order sideband into a semiconductor optical amplifier (SOA) for four-wave mixing, and filtering a-11-order sideband carrying BPSK signal phase information and a + 10-order sideband not carrying BPSK signal phase information generated after four-wave mixing by using the optical cross multiplexer, and finally, sending the-11-order sideband and the + 10-order sideband into a photoelectric detector for beat frequency to obtain 21-frequency-doubled electric millimeter waves. The invention has the advantages of simple structure, high frequency multiplication times, wide tunable range and low system cost.

Description

Technical field [0001] The present invention belongs to the field of optical load millimeter wave generated in the radio-over-fiber, referred to as ROF) communication system technology. Background technique [0002] With the arrival of big data and Internet of Things, business diversity is growing, cloud computing, cloud storage, and mobile Internet services have gradually spread, and high-capacity high rate has become the goal of current and next-generation network transmission. The communication capacity of the mobile communication system, the transmission rate is also increasing, which in turn has promoted the generation and development of the fifth-generation wireless access system (5G), and the carrier frequency extends to the millimeter wave section. However, the frequency of radio waves high in the atmosphere is fast, and the transmission cannot be performed. The Radio Over Fiber (ROF) technology provides a very potential solution for future broadband wireless access. ROF ...

AI Technical Summary

Problems solved by technology

The three-parallel MZM modulator structure consists of three parallel sub-MZM modulators and an optical phase shifter (PS). The polarization multiplexing structure includes two polarization controllers (PC), a polarization beam splitter (PBS), and a single MZM and polarization beam combiner (PBC), complex structure

All of the above solutions need to use multiple modulators, the system cost is high, the structure is complex, it is difficult to control the DC bias voltage, RF signal phase difference and modulation depth of each modulator, and the performance stability is not high

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