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Phase Noise Characterization of a Mode-Locked Quantum-Dot Coherent Optical Frequency Comb Source Laser

机译：锁模量子点相干光频梳源激光器的相位噪声特性

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摘要

Modern coherent optical communication systems transmit 100 Gb/s dual-polarization quadrature phase shift keying (DP-QPSK) signals on each of the 100 channels in a dense wavelength division multiplexing (DWDM) system. Each of these channels require an individual optical carrier frequency to be generated from a discrete high-performance tunable laser. These arrays of discrete lasers are an expensive component in the transmitter of an optical communication channel. Thus, recent research has investigated an alternative laser source - optical frequency combs (OFCs). OFCs generate numerous spectral modes, referred to as comb lines, from a single photonic device. Each of these comb lines can be used as an optical carrier frequency for a channel in a DWDM system. Thus, the implementation of an OFC as a laser source for coherent optical communications minimizes the number of laser modules in a DWDM system leading to a drastic reduction in system cost and complexity. Additionally, OFCs exhibit an intrinsic coherence among each comb line across the spectrum. This coherence implies that the phase noise exhibited by each comb line in the OFC is related which allows for effective methods of phase noise compensation. Consequently, OFCs are heavily under research and development.;In this research, a prototype 25 GHz quantum-dot coherent optical frequency comb source laser is characterized in both the time and frequency domains. The output of the comb source laser is extensively observed and the optical and electrical spectra, spectral flatness, relative intensity noise, phase noise, linewidth and timing jitter are measured. These preliminary results led to the development of a coherent phase noise detection scheme capable of recovering time domain phase noise trajectories for pairs of comb lines. The detection scheme allowed the coherence exhibited by the comb source to be quantified using a correlation coefficient which compared recovered phase noise trajectories for pairs of comb lines. Additionally, the statistical properties of the recovered phase noise trajectories are explored which enables experimental quantification of the relative contribution of amplified spontaneous emission (ASE) noise and timing jitter for each mode. Experimental results are shown to align with theoretical descriptions of phase noise in mode-locked lasers.
机译：现代相干光通信系统在密集波分复用（DWDM）系统中的100个通道中的每个通道上都发送100 Gb / s双偏振正交相移键控（DP-QPSK）信号。这些通道中的每一个都需要从分立的高性能可调激光器产生单独的光学载波频率。这些离散激光器阵列在光通信信道的发射机中是昂贵的组件。因此，最近的研究已经研究了另一种激光源-光学频率梳（OFC）。 OFC从单个光子设备生成许多光谱模式，称为梳状线。这些梳状线中的每条可用作DWDM系统中信道的光载波频率。因此，将OFC实施为用于相干光通信的激光源可最大程度地减少DWDM系统中激光模块的数量，从而大大降低系统成本和复杂性。另外，OFC在整个光谱的每个梳齿线之间表现出固有的相干性。这种相干性意味着OFC中每条梳状线所表现出的相位噪声是相关的，这允许采用有效的相位噪声补偿方法。因此，OFC正在大量研究和开发中。在本研究中，在时域和频域上对原型25 GHz量子点相干光频率梳源激光器进行了表征。广泛观察到梳状光源的输出，并测量了光学和电子光谱，光谱平坦度，相对强度噪声，相位噪声，线宽和定时抖动。这些初步结果导致了相干相位噪声检测方案的开发，该方案能够恢复成对的梳齿线的时域相位噪声轨迹。该检测方案允许使用相关系数来量化由梳状源表现出的相干性，该相关系数针对成对的梳状线比较了恢复的相位噪声轨迹。此外，还探索了恢复相位噪声轨迹的统计特性，从而能够对每种模式的放大自发辐射（ASE）噪声和时序抖动的相对贡献进行实验量化。实验结果表明与锁模激光器中相位噪声的理论描述一致。

著录项

  • 作者

    Zanette, Kristian.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Electrical engineering.
  • 学位 M.A.Sc.
  • 年度 2017
  • 页码 194 p.
  • 总页数 194
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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