scholarly journals Impact of local oscillator frequency noise on coherent optical systems with electronic dispersion compensation

2015 ◽  
Vol 23 (9) ◽  
pp. 11221 ◽  
Author(s):  
Aditya Kakkar ◽  
Richard Schatz ◽  
Xiaodan Pang ◽  
Jaime Rodrigo Navarro ◽  
Hadrien Louchet ◽  
...  
Keyword(s):  
Dispersion Compensation ◽  
Local Oscillator ◽  
Optical Systems ◽  
Frequency Noise ◽  
Oscillator Frequency ◽  
Electronic Dispersion

scholarly journals Analysis and Compensation of Chromatic Dispersion in Long-hauls Optical Coherent System

2021 ◽  
Author(s):  
Narimane Hadjadji ◽  
Rachid Hamdi
Keyword(s):  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Optical Systems ◽  
Coherent System ◽  
Phase Shift Keying ◽  
Transmission Distance ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Simulation Results ◽  
Electronic Dispersion

In this paper, we demonstrate the efficiency of Electronic Dispersion Compensation (EDC) for coherent optical systems based on Polarization Division Multiplexed Quadrature Phase Shift Keying (PDM-QPSK). The performance of the proposed system is tested using a pulse that has been recently used in the presence of nonlinear effects.The proposed system is compared to the 0.3RZ-PDM-QPSK system at the optimum launched power under different symbol-rates and lengths of transmission. The simulation results confirm that the proposed method enhances the system performance. In addition, it secures a low penalty that is below 0.6 dB. As a result, the feasible transmission distance is improved by 29 %, 20.15 %, and 26.7 %, at 14 GBaud, 28 Gbaud, and 56 Gbaud, respectively.

scholarly journals Transport of pseudothermal photons through an anharmonic cavity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dmitriy S. Shapiro
Keyword(s):  
Pauli Principle ◽  
Optical Systems ◽  
Frequency Noise ◽  
Continuous Transition ◽  
Noise Current ◽  
Nonperturbative Solution ◽  
Occupation Numbers ◽  
Fundamental Reason ◽  
The Rich ◽  
Quantum Optical

AbstractUnder nonequilibrium conditions, quantum optical systems reveal unusual properties that might be distinct from those in condensed matter. The fundamental reason is that photonic eigenstates can have arbitrary occupation numbers, whereas in electronic systems these are limited by the Pauli principle. Here, we address the steady-state transport of pseudothermal photons between two waveguides connected through a cavity with Bose–Hubbard interaction between photons. One of the waveguides is subjected to a broadband incoherent pumping. We predict a continuous transition between the regimes of Lorentzian and Gaussian chaotic light emitted by the cavity. The rich variety of nonequilibrium transport regimes is revealed by the zero-frequency noise. There are three limiting cases, in which the noise-current relation is characterized by a power-law, $$S\propto J^\gamma$$ S ∝ J γ . The Lorentzian light corresponds to Breit-Wigner-like transmission and $$\gamma =2$$ γ = 2 . The Gaussian regime corresponds to many-body transport with the shot noise ($$\gamma =1$$ γ = 1 ) at large currents; at low currents, however, we find an unconventional exponent $$\gamma =3/2$$ γ = 3 / 2 indicating a nontrivial interplay between multi-photon transitions and incoherent pumping. The nonperturbative solution for photon dephasing is obtained in the framework of the Keldysh field theory and Caldeira-Leggett effective action. These findings might be relevant for experiments on photon blockade in superconducting qubits, thermal states transfer, and photon statistics probing.

scholarly journals Signal Degradation and Excess Insertion Loss of Optical Mach–Zehnder Modulators in the Presence of Electronic Dispersion Compensation

2017 ◽  
Vol 9 (4) ◽  
pp. 1-9
Author(s):  
Xiatao Huang ◽  
Xingwen Yi ◽  
Mingyue Zhu ◽  
Jing Zhang ◽  
Zengjie Zhang ◽  
...  
Keyword(s):  
Insertion Loss ◽  
Dispersion Compensation ◽  
Signal Degradation ◽  
Electronic Dispersion

An Electronic Dispersion Compensation Transceiver for 10- and 28-Gb/s Directly Modulated Lasers-Based Optical Links

2019 ◽  
Vol 54 (1) ◽  
pp. 55-64
Author(s):  
Kyeongha Kwon ◽  
Jong-Hyeok Yoon ◽  
Younho Jeon ◽  
Hanho Choi ◽  
Sejun Jeon ◽  
...  
Keyword(s):  
Dispersion Compensation ◽  
Optical Links ◽  
Directly Modulated Lasers ◽  
Electronic Dispersion

scholarly journals Dynamical decoupling of laser phase noise in compound atomic clocks

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Sören Dörscher ◽  
Ali Al-Masoudi ◽  
Marcin Bober ◽  
Roman Schwarz ◽  
Richard Hobson ◽  
...  
Keyword(s):  
Phase Noise ◽  
Phase Measurement ◽  
Local Oscillator ◽  
Frequency Instability ◽  
Laser Frequency ◽  
High Signal ◽  
Frequency Noise ◽  
Atomic Clocks ◽  
Dynamical Decoupling ◽  
Measurement Protocol

Abstract The frequency stability of many optical atomic clocks is limited by the coherence of their local oscillator. Here, we present a measurement protocol that overcomes the laser coherence limit. It relies on engineered dynamical decoupling of laser phase noise and near-synchronous interrogation of two clocks. One clock coarsely tracks the laser phase using dynamical decoupling; the other refines this estimate using a high-resolution phase measurement. While the former needs to have a high signal-to-noise ratio, the latter clock may operate with any number of particles. The protocol effectively enables minute-long Ramsey interrogation for coherence times of few seconds as provided by the current best ultrastable laser systems. We demonstrate implementation of the protocol in a realistic proof-of-principle experiment, where we interrogate for 0.5 s at a laser coherence time of 77 ms. Here, a single lattice clock is used to emulate synchronous interrogation of two separate clocks in the presence of artificial laser frequency noise. We discuss the frequency instability of a single-ion clock that would result from using the protocol for stabilisation, under these conditions and for minute-long interrogation, and find expected instabilities of σy(τ) = 8 × 10−16(τ/s)−1/2 and σy(τ) = 5 × 10−17(τ/s)−1/2, respectively.

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