80-GHz RoF Based on Push–Pull Modulator

F Zhao,X J Xin,J L Li,B Liu,J M Gong,D D Han,J R Bai,S Y Liang,Z Q Hui

doi:10.1109/jphot.2019.2935125

F Zhao, X J Xin + Show 7 more

Open Access

https://doi.org/10.1109/jphot.2019.2935125

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Abstract

A novel push-pull modulator based scheme to generate W-band millimeter-wave (mm-wave) vector signal was proposed and experimentally demonstrated. Related to an I/Q modulator, push-pull modulator has the advantages of simple architecture, small insertion loss and low cost. Through combining one 40 GHz upper sideband (USB) using a quadrature-phase-shift-keying (QPSK) modulation with a −40 GHz unmodulated lower sideband (LSB), a QPSK modulated 4 G-Baud 80 GHz single sideband vector mm-wave signal was successfully generated.

Highlights

Due to the small loss, an optical fiber can provide ultra-long transmission distance and high transmission capacity
We present a push-pull modulator based W-band mm-wave vector signal generation scheme
Offline digital signal processing (DSP) techniques such as down-conversion, constant-modulus-algorithm (CMA) equalization, carrier recovery and bit error rate (BER) calculation are adopted to recover the data captured by OSC from the 8 GHz intermediate frequency (IF) signal [3]

Summary

Introduction

Due to the small loss, an optical fiber can provide ultra-long transmission distance and high transmission capacity. It is cannot realize wide-area seamless coverage due to wire-line delivery. To meet the large-capacity demand by the rising mobile data communication, the W-band (75–110 GHz) mm-wave with a high vector modulation spectral-efficiency and a large available bandwidth has been applied into RoF systems [15]–[23]. [15] a scheme based on an I/Q modulator was proposed, the generation and the delivery experiment of a W-band vector mm-wave signal was reported. We present a push-pull modulator based W-band mm-wave vector signal generation scheme. An experiment was performed to generate a 4 G-Baud 80 GHz single sideband vector mm-wave signal with a quadrature-phase-shift-keying (QPSK) modulation by combining a 40 GHz QPSK modulated upper sideband (USB) with a −40 GHz unmodulated lower sideband (LSB)

Principle

Experimental Details

Results

Conclusions