A filterless frequency 32-tupling photonic scheme to generate Sub-Terahertz wave signal enabled by optical polarization modulators

Xinqiao Chen,Zhihan Li,Xiaorui Liu

doi:10.1007/s11082-021-03321-z

Xinqiao Chen, Zhihan Li + Show 1 more

Open Access

https://doi.org/10.1007/s11082-021-03321-z

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Abstract

A scheme based on polarization modulators to generate Sub-Terahertz (Sub-THz) wave signal with frequency 32-tupling is proposed. The system consists of two subsystems in cascade, and each subsystem consists of 4 paralleled polarization modulators. In this scheme, by properly controlling two subsystems, an optical signal with optical carrier and ±16th-order optical sidebands is achieved. Next, by adjusting the optical attenuator and optical phase shifter, the optical carrier can be canceled. Finally, the Sub-THz wave with frequency 32-tupling can be obtained after beaten in the photodetector. The results show the ±16th-order optical sideband suppression ratio is 53.38 dB and the radio frequency sideband suppression ratio of the 32-tupling Sub-THz wave is 42 dB, which are consistent with the theoretical analysis very well. Meanwhile, the effects of phase offset, modulation index, and attenuator deviation on suppression ratio are analyzed.

Highlights

To meet the increasing demand of mobile communication and multimedia services, higher capacity wireless access network is necessary
Abouelez et al have proposed a scheme to generate a frequency 12tupling mm-wave by cascaded dual parallel polarization modulator (DP-PolM)[16]
The optical sideband suppression ratio (OSSR) and radio frequency sideband suppression ratio (RFSSR) of the optical signal and Sub-THz wave signal vary with the phase deviations. It indicates that when the phase deviation reaches ±5◦, the values of OSSR and RFSSR greatly drop from 53.38 dB to 18.36 dB, and RFSSR drops from 42 dB to around 12 dB

Summary

Introduction

To meet the increasing demand of mobile communication and multimedia services, higher capacity wireless access network is necessary. There have been many demonstrations on the filterless generation of mm-wave based on Mach-Zehnder Modulator (MZM) in parallel [9], or in cascade [10]. Wang et al have proposed several schemes to generate vector mm-wave based on MZM and digital modulation format combinations. Abouelez et al have proposed a scheme to generate a frequency 12tupling mm-wave by cascaded dual parallel polarization modulator (DP-PolM)[16]. Kumar et al have proposed a method to generate frequency 24-tupling mm-wave signal by optical filters and SOA, but the usage of optical filter limits the frequency tuning range [17]. A filterless photonic scheme to generate Sub-Terahertz wave signal with frequency 32-tupling is proposed and demonstrated. The frequency 32-tupling Sub-Terahertz wave is generated after the photodetector beating

System design and principle

Simulation results

Findings

Conclusion