Effects of local oscillator on the performance of DP-QPSK WDM system with channel spacing of 37.5 GHz

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Neeraj Sharma ◽  
Sunil Agrawal ◽  
Vinod Kapoor ◽  
Sumit Budhiraja
Keyword(s):  
Optical Power ◽  
Local Oscillator ◽  
Narrow Channel ◽  
Laser Linewidth ◽  
Phase Shift Keying ◽  
Channel Spacing ◽  
Modulation Format ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Frequency Grid

AbstractDual-polarization quadrature phase shift keying (DP-QPSK) modulation format is emerging as a main contender for 37.5 GHz frequency grid of WDM systems. However, the optical add drop multiplexers (OADMs) affect the performance of the system because of narrow channel spacing. The local oscillator (LO) is an important component of the digital coherent receiver. This paper analyzes the effects of LO parameter on the performance of the considered system. It is exhibited that optimum range of optical power and laser linewidth of the LO helps in improving the performance of the considered system.

Effects of Laser Linewidth on the Performance of DP-QPSK DWDM System

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Neeraj Sharma ◽  
Sunil Agrawal ◽  
Vinod Kapoor ◽  
Sumit Budhiraja
Keyword(s):  
Wavelength Division Multiplexing ◽  
Adaptive Equalization ◽  
Laser Linewidth ◽  
Phase Shift Keying ◽  
Channel Spacing ◽  
Wavelength Division ◽  
Differential Encoding ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Dwdm System

AbstractThis paper analyzes the effects of laser linewidth on the performance of eight-channel dual-polarization quadrature phase-shift keying (DP-QPSK) dense wavelength division multiplexing (DWDM) transmission at 50 GHz channel spacing. The performance of differential encoding and Gray coding is compared with the system without any coding for the DP-QPSK DWDM system. It is shown that the differentially-encoded system performs better for lasers with linewidth (∆ν) greater than 0.04 MHz compared to the system with Gray coding and system without any coding. However, for lasers with linewidth lesser than 0.04 MHz, the three systems considered here perform equally and there is no need for differential or Gray coding in such a case. It is also shown that if we apply frequency offset estimation (FOE) before adaptive equalization (AE) in the digital coherent receiver then it further improve the performance of the differentially encoded system with lasers sources having linewidth even greater than 0.1 MHz.

Reception of Polarization-Multiplexed QPSK Using Different Receivers with and without Differential Decoding

2015 ◽  
Vol 36 (3) ◽  
Author(s):  
Iqbal Kaur ◽  
Kamaljit Singh Bhatia ◽  
Harsimrat Kaur
Keyword(s):  
Phase Shift ◽  
Bit Error Rate ◽  
Local Oscillator ◽  
Training Sequence ◽  
Mean Square ◽  
Least Mean Square ◽  
Phase Shift Keying ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

AbstractIn this paper, we analyze polarization-multiplexed quadrature phase shift keying (PM-QPSK) signals using different receiver with and without differential decoding for PM-QPSK modulation and reception using training sequence-based least mean square (LMS) receiver, PM-QPSK with external local oscillator, PM-QPSK modulation and LMS dynamic receiver and compare their results for bit error rate.

scholarly journals Optical 8PSK Modulation Format Generator Basedon Three Microring Modulators

2021 ◽  
Author(s):  
Satyabrata Singha ◽  
Sanjukta Bhowmik ◽  
Nitish Sinha ◽  
Bishanka Brata Bhowmik
Keyword(s):  
Phase Shift ◽  
Bit Error Rate ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Phase Shift Keying ◽  
Result Section ◽  
Modulation Format ◽  
Quadrature Phase ◽  
Shift Keying ◽  
In Series

Abstract We have proposed an 8PSK modulator based on three microring modulators (MRM). The design consists of three MRMs, each with a radius of 11.1μm. Of these three, two MRMs are connected in parallel and they together generate a QPSK (Quadrature phase shift keying) signal. While at the output port of the QPSK, a third MRM is connected in series works as an angle modulator, which is basically a 45o phase shift modulator; i.e., the output of the MRM varies by 45o depending on the bit pattern fed to it, ’0’or ’1’ respectively. In the result section, we have simulated and shown the performance of the proposed 2.5 GBaud 8PSK modulator after transmitting the modulated signal through various lengths of optical fiber. The bit error rate (BER) vs. optical signal to noise ratio (OSNR) curve shows that, 10−3BER has been achieved at 13.5dB OSNR.

scholarly journals Research on single carrier frequency domain equalization system based on FQPSK modulation

2018 ◽  
Vol 17 ◽  
pp. 03012
Author(s):  
Meng Zhang ◽  
Zhisong Bie
Keyword(s):  
Frequency Domain ◽  
Carrier Frequency ◽  
Viterbi Algorithm ◽  
Cyclic Prefix ◽  
Phase Shift Keying ◽  
Frequency Domain Equalization ◽  
Single Carrier ◽  
High Power Amplifier ◽  
Quadrature Phase ◽  
Shift Keying

Feher-patented quadrature phase shift keying (fqpsk) modulation is proposed for single-carrier frequency domain equalization (sc-fde). this paper puts forward a new method modulation called cc-bcd-fqpsk. the fqpsk signal is oversampled to make that the discrete fourier transform (dft)/ inverse dft (idft) processing of it can be applied for sc-fde. the methodology for maintaining waveform continuity with a cyclic prefix (cp) is presented. wrap-around viterbi algorithm (wava) is suggested for demodulation after equalization at the receiver. simulation results show that sc-fde system based on cc-bcd-fqpsk modulation has higher spectral efficiency than linear modulation qpsk and is an effective approach for eliminating isi and using nonlinear high power amplifier.

Digital-analog hybrid optical phase-lock loop for optical quadrature phase-shift keying

2020 ◽  
Vol 18 (9) ◽  
pp. 090602
Author(s):  
Shaowen Lu ◽  
Yu Zhou ◽  
Funan Zhu ◽  
Jianfeng Sun ◽  
Yan Yang ◽  
...  
Keyword(s):  
Phase Shift ◽  
Phase Lock Loop ◽  
Phase Shift Keying ◽  
Phase Lock ◽  
Optical Phase ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

scholarly journals Securing ZigBee Commercial Communications Using Constellation Based Distinct Native Attribute Fingerprinting

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Christopher M. Rondeau ◽  
J. Addison Betances ◽  
Michael A. Temple
Keyword(s):  
Discriminant Analysis ◽  
Phase Shift ◽  
Rejection Rate ◽  
Phase Shift Keying ◽  
Multiple Discriminant Analysis ◽  
Network Protection ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Network Device

This work provides development of Constellation Based DNA (CB-DNA) Fingerprinting for use in systems employing quadrature modulations and includes network protection demonstrations for ZigBee offset quadrature phase shift keying modulation. Results are based on 120 unique networks comprised of seven authorized ZigBee RZSUBSTICK devices, with three additional like-model devices serving as unauthorized rogue devices. Authorized network device fingerprints are used to train a Multiple Discriminant Analysis (MDA) classifier and Rogue Rejection Rate (RRR) estimated for 2520 attacks involving rogue devices presenting themselves as authorized devices. With MDA training thresholds set to achieve a True Verification Rate (TVR) of TVR = 95% for authorized network devices, the collective rogue device detection results for SNR ≥ 12 dB include average burst-by-burst RRR ≈ 94% across all 2520 attack scenarios with individual rogue device attack performance spanning 83.32% < RRR < 99.81%.

Sign in / Sign up

Export Citation Format

Share Document