Peak-to-Average Power Ratio Reduction of Carrier-Suppressed Optical SSB Modulation: Performance Comparison of Three Methods

K I Amila Sampath,Joji Maeda,Katsumi Takano

doi:10.3390/photonics8030067

K I Amila Sampath, Joji Maeda + Show 1 more

Open Access

https://doi.org/10.3390/photonics8030067

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Journal: Photonics	Publication Date: Feb 26, 2021
Citations: 6	License type: CC BY 4.0

Affiliation: Tokyo University of Science, Yamagata University

Abstract

We compare the performances of three previously proposed methods to reduce the peak-to-average power ratio (PAPR) of the carrier-suppressed optical single-sideband (OSSB-SC) signal. PAPR of OSSB-SC signal becomes high due to the peaky Hilbert-transformed signal which is used for spectral suppression. Nonlinear phase shifts induced by high PAPR degrade OSSB-SC signal during fiber transmission. Previously, we proposed peak folding, peak clipping, and high-pass Hilbert transform methods to reduce the PAPR of OSSB-SC modulation. In this study, we numerically compare the effectiveness of proposed methods in a 10 Gbit/s non-return-to-zero (NRZ)-coded 100-km single-channel transmission link. Due to the reduced PAPR, peak folding and peak clipping can increase the self-phase modulation (SPM) threshold of the studied system by 2.40 dB and 2.63 dB respectively. The high-pass Hilbert transform method improves the SPM threshold by more than 9 dB.

Highlights

Tremendous amounts of data traffic being added to short-reach networks are expediting data rate scaling of 100 to 400 G and beyond [1,2,3]
Peak-folding starts transmission to occur for modulation effective solution for short-reach links, high of becomes effective solution for short-reach links, high peakto-average power ratio (PAPR) of optical single-sideband (OSSB)-SC transmission becomes aa depths larger than
We reported the capability of PAPR reduction of OSSB-SC signal using the cut-off frequency of 3 GHz for 10 Gbit/s NRZ-coded signals

Summary

Introduction

Tremendous amounts of data traffic being added to short-reach networks are expediting data rate scaling of 100 to 400 G and beyond [1,2,3]. Intensity modulation-direct detection (IM-DD) transmission is preferred for short-reach links because of its simplicity and costeffectiveness [4,5,6]. To meet the capacity requirements, it is becoming obvious that more degree of freedom is required in short-reach links. Driven by emerging capacity hungry applications, digital coherent transmission with the high-order degree of freedom using polarization and wavelength-multiplexing is gaining attention in short-reach links, regardless of the cost [7,8,9]. Optical single-sideband (OSSB) modulation with direct-detection took the attention of researchers as a cost-effective solution for increasing the capacity of short-reach links [10,11,12]. In C-band transmission, OSSB modulation can tolerate signal distortions induced by chromatic dispersion because of the single-sided spectrum [13,14]. Electrical dispersion compensation can be done in the receiver [15,16]

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Conclusion