一、本期重点：
published：2013.5.13
内容介绍：
DQPSK由于具有高效率、更好的信噪比容差和更大的色散容差，因此在高速传输的密集波分复用系统中起着越来越重要的作用。
这篇文章通过将可调谐DFB阵列和马赫-曾德干涉仪集成在一块芯片上，实现了44.6Gb/s 的基于DQPSK码型的光发射机（ TLA-MZMs）。它覆盖了98个波长通道，覆盖了L波段，满足50GHz频率间隔的ITU-T标准。所有通道的边模抑制比都达到了47dB以上。MZ干涉仪的直流消光比达到25db以上。该设计同时实现了低的调制电压（2 Vπ，小于3V）和低的损耗（小于1dB）。
它第一次利用DFB可调谐激光器阵列和MZ干涉仪单片集成实现了基于InP基的DQPSK光发射机芯片，具有紧凑、低功耗、低成本的特点。
图1 TLA-MZMs结构原理图
doi:10.1364/OE.21.019718
published: 2013.8.14
内容介绍：
近些年利用绝缘体上硅（SOI）作为平台制作光子集成芯片正成为热点。由于硅集成工艺十分成熟，并且它的高折射率差具有很好的限制光的作用，从而制作出更小的器件。在SOI上生长III-V材料制作光器件可以很好地实现有源无源集成。
J. E. Bowers 等人实现了利用混合硅集成制作的基于游标效应的环形可调谐激光器，它由两个内腔环形谐振器进行波长选择，利用bonding技术在硅上制作III-V有源增益介质，利用热调谐环的折射率进行波长调谐，实现了40nm以上的波长调谐范围、35dB以上的边模抑制比和338kHz的线宽。
图2（a）混合游标环形激光器原理图及（b）实物图
图3 （a）计算得到的两个环的透射跌价谱（b）计算得到的耦合环形激光器透射谱（c）计算得到的全腔传输透射谱，内插图为计算模型图
二、简讯：
doi:10.1109/LPT.2013.2263788
published：2013.7.1
Abstract:
A novel design of an easily and fully integrated terabit per second (Tbit/s) optical router is presented and analyzed using the finite difference time domain method. The proposed router consists of three photonic bandgap (PBG) waveguides with two nematic liquid crystal (NLC) layers. The suggested device can be used to divert the light beam to one of the three photonic crystal waveguides based on the biasing states of the two NLC layers. In this way, there are three different modes of operation where each one is used for routing data to the required direction. The suggested device offers crosstalk of 19 dB. In addition, the reported structure opens up the revenue for building multi-port optical routers through the use of a number of appropriately positioned NLC layers within the platform of PBG structure.
doi:10.1021/nl304069n
published: 2013.1.8
Abstract:
We demonstrate a reusable and reconfigurablesurface enhanced Raman scattering (SERS) platform byoptically trapping Ag nanoparticles with a photonic crystalcavity integrated with a microfluidic chip. High-performanceSERS is performed in a very reproducible manner, owing to thefact that Ag aggregates are produced by optical trapping in acontrollable process that is monitored in real-time by the cavityresonance shift that occurs with the trapping of each additionalnanoparticle.
doi:10.1364/OL.38.000947
published：2013.3.15
Abstract:
In this Letter we demonstrate frequency conversion in the single-photon regime through Bragg-scattering four-wave mixing with near-unit efficiency in a 750m long commercially available dispersion-engineered highly nonlinear fiber, where all photons and pump laser frequencies are in the low-loss telecommunications band. We achieve 99.1%±4.9%down-conversion and 98.0%±5.0%upconversion of photons by 12 nm using a weak coherent state with an average input of 0.27 photons per detection gate window.
published：2013.1.1
Abstract:
We experimentally study the wavelength conversion of 10-Gb/s return-to-zero signal using interband four-wave mixing inside a semiconductor optical amplifier with 10-ps gain-recovery time. Power of the converted signal exceeds that of the original signal for wavelength shifts of up to 8 nm. Our technique is energy efficient as the required input pump power is <; 1 mW . We discuss the observed performance of such a wavelength converter in terms of required pump power, conversion efficiency, and optical signal-to-noise ratio of the converted signal. For an 8-nm wavelength shift, the converted data signal exhibits no Q-factor degradation while having 2.7-dB power gain.
供稿人：胡志朋
