Low Power Consumption DQPSK Demodulator Using Silica-Based Planar Lightwave Circuit

We demonstrate a low power consumption differential quadrature phase-shift keying (DQPSK) demodulator using silica-based planar lightwave circuit (PLC) technology. A reduction of the power consumption is achieved by suppressing the temperature dependence of the circuit characteristic and eliminating a thermo-electric cooler (TEC) device. The maximum power consumption of the fabricated demodulator with an operating temperature range of ${-}$5 $^{circ}$C to 70 $^{circ}$C is 1.4 W, which is 60% lower than that of a conventional PLC demodulator with TEC. We report experimental results that demonstrate its good demodulation performance for a 43-Gb/s DQPSK system.      

Integrated Wavelength-Insensitive Differential Laser Doppler Velocimeter Using Planar Lightwave Circuit

In this paper, a design of an integrated wavelength-insensitive laser Doppler velocimeter (LDV) has been proposed using planar lightwave circuit (PLC). The proposed LDV uses arrayed waveguide gratings (AWGs) that can be fabricated using PLC technology. Its characteristics are simulated using a design model based on grating equations for AWGs. The simulation results indicate that wavelength-insensitive operation can be almost obtained by optimizing the design parameters of the proposed structure without assembly of bulk diffractive gratings or other optical elements.     

二氧化硅平面光波导器件的研究进展

二氧化硅平面光波导(PLC)器件以其低损耗、高工艺容差,以及与CMOS工艺兼容和与单模光纤模场匹配良好等优点,在光通信、光互连和集成光学中得到了广泛的应用.文章综述了二氧化硅平面光波导器件及其应用的进展,重点针对分束器、阵列波导光栅、可调光衰减器及其集成器件的最新研究进行了介绍,对未来发展趋势进行了展望.     

聚合物平面光波导器件的研究进展

聚合物平面光波导(PLC)器件以其低损耗、低成本、低功耗,以及制备工艺简单等优点,在光通信网络、微波光子学、传感监控等领域发挥着重要作用。文章梳理了近年来聚合物平面光波导器件的代表性工作,其中包括阵列波导光栅、可变光衰减器、光开关及其集成器件,讨论了聚合物平面光波导未来的发展方向。     

新型非稳腔Yb:YAG400W平面波导激光器

研究了一种平面波导激光器,它包含一个13 mm×12 mm×150/μm Yb:YAG棒芯,外面包覆1 mm厚的蓝宝石,通过两个450 W二极管叠阵进行边缘泵浦,叠阵加入了定制的像差修正相位片.激光器的平一凹谐振腔与其他圆盘薄片激光器相比,可以产生400 W的平均功率,激光束为低阶横模和多阶纵模,斜率效率75%,横向光...     

Circularly Polarized External Cavity Laser Hybrid Integrated With a Polyimide Quarter-Wave Plate on Planar Lightwave Circuit

We propose and demonstrate a circularly polarized external cavity laser (ECL) hybrid integrated on a planar lightwave circuit (PLC). The ECL is composed of a spot-size converter integrated laser diode, a UV-written grating, and a polyimide quarter-wave plate on the PLC using hybrid-integration technology. The polyimide quarter-wave plate of an 8.8-mum thickness was inserted in a trench with a 20-mum width and a 300-mum depth on the PLC platform, and fixed with a UV-curable adhesive. The ECL hybrid integrated with the polyimide wave plate becomes highly circular-polarized with a degree of circular polarization of 0.992. This circularly polarized ECL operated with a sidemode suppression ratio of >50 dB at ~1550 nm.     

平面光路中交叉波导的损耗和串扰研究

在大规模平面光路器件的布版中不可避免地会发生光波导交叉情况,交叉波导引入的损耗和串扰随交叉角度的变化而变化.文章围绕这个问题制作了硅基二氧化硅交叉波导样品并进行了损耗及串扰测试,结果表明,采用大于25°的交叉角度,可使每个交叉点的损耗小于0.1dB,串扰小于-40dB,满足器件的设计要求.     

Integrated Low-Jitter 400-MHz Femtosecond Waveguide Laser

An integrated passively mode-locked waveguide laser generating 440-fs pulses at 394-MHz repetition rate is demonstrated on an 18 mm $, times ,$44 mm silica waveguide chip. The laser self-starts, and uses a saturable Bragg reflector for mode-locking.      

波导平面电路定向耦合器及CAD

本文利用平面电路耦合孔阵作为波导侧壁耦合的定向耦合器电路;该平面电路具有调节耦合度方便、加工简单、生产成本低的特点.本文给出了计算机辅助设计的方法和测试结果.     

Planar Circuit Mounted in Waveguide Used as a Downconverter

This paper describes the equivalent network constants of several patterns of the planar circuit mounted in a waveguide which was proposed by this author. As an example of the application of the circuit, a planar circuit is designed for a 12-GHz band downconverter by using the equivalent network constants.     

平面波导（PLC）光分路器的工艺及性能影响因素分析

本文介绍了平面波导（PLC）光分路器的构造和原理、特点及制作工艺。根据PLC光分路器的生产工艺,分析了影URPLC光分路器性能的主要因素．并为提升PLC光分路器性能提供了若干建议。     

棱边倒角面抽运热键合平板波导固体激光器

采用晶体热键合方法加工制作了YAG/Nd:YAG/YAG单包层平板波导,波导晶体几何尺寸为12 mm×5 mm×1 mm,其中中心掺杂层Nd:YAG厚度约为0.2 mm,对称外包层YAG厚度约为0.4 mm。采用一种新的抽运方法—棱边倒角面抽运方法对晶体进行抽运:波导晶体的一条12 mm长棱边加工成大小为12 mm×0.3 mm的倒角面,快轴准直抽运激光二极管(LD)发出的抽运光经聚焦后从倒角面入射进入晶体,抽运吸收效率约为82%。激光器谐振腔采用平-平腔,其中全反镜直接在波导晶体端面镀高反膜实现,输出镜尽可能靠近晶体另一端面,腔长约12mm。当输出镜透射率为6.6%,激光二极管抽运光功率约为49.5 W时,得到输出激光功率13.6 W,光-光转换效率约27.5%,导波方向光束质量M2因子1.9。激光器实现了较高的光-光转换效率和较好的导波方向光束质量。     

Advances in Silica Planar Lightwave Circuits

This paper presents a synopsis of some of the advances in silica waveguide planar lightwave circuits (PLCs). It concentrates on silica PLCs for fiber-optic communications, mainly routing and signal processing devices. A significant portion is devoted to arrayed waveguide gratings     

Multiwavelength Lasers for WDM-PON Optical Line Terminal Source by Silica Planar Lightwave Circuit Hybrid Integration

We have demonstrated a very compact eight-channel 200-GHz-spacing multiwavelength laser (MWL) module for the optical line terminal source of wavelength-division-multiplexing passive optical network. The wavelength shift of MWLs and external cavity lasers from the ITU grid was within +0.14 nm for eight channels, which was well matched to the target wavelength shift of less than plusmn0.2 nm. The oscillation characteristics of our MWL module are better than those of conventional MWLs with hybrid integration.     

有源波导环形谐振腔产生毫米波的理论分析

提出了一种用有源波导环形谐振腔产生毫米波的方案。阐述了用有源环形腔产生毫米波的基本原理,分析了泵浦光功率、泵浦光持续时间和输入到环形腔中的光脉冲宽度对产生的毫米波性能的影响。分析结果表明当该方案用于ROF中产生射频波段的毫米波,以及用于高频微波光子技术中优势显著。     

Short End Effect of Ridge Guide with Planar Circuit Mounted in a Waveguide

The end effect of the short end ridge guide with planar circuit mounted in a waveguide is theoretically obtained by a variational method. The results were also confirmed by measured values. The resonant frequency of a ridge guide resonator was also obtained by using the above mentioned end effect.     

Analysis of Image Recovery Down Converter Made by Planar Circuit Mounted in a Waveguide

This paper presents an analysis of a superhigh frequency (SHF) down converter using a Schottky-barrier mixer diode and a planar circuit mounted in a waveguide. The analysis assumes that the mixer diode consists of a nonlinear conductance g, a junction capacitance C/sub j/, an ohmic spreading resistance R/sub s/, and several parasitic susceptances. The frequency performance of the impedance of external circuits at the signal, image, and intermediate frequency bands is considered. This analysis also includes consideration of the mismatching effect between the converter and the IF amplifier, and the optimum design procedure for the down converter. Using this theoretical method, a SHF down converter was designed and constructed. Its application is low noise receivers for satellite broadcasting. The design used the optimum image condition (the image impedance takes a low value, i.e., nearly a short). The RF band is 11.7 - 12.2 GHz, the IF band is 0.96 - 1.46 GHz, and the total noise figure is 3.3 - 3.7 dB. The noise figure is in good agreement with the (3.2 - 3.6 dB) obtained from this analysis.     

高重复频率飞秒激光烧蚀熔融石英制作单偏振微结构波导

利用中心波长为1040nm、脉宽为190fs、重复频率在200～5000kHz之间可调的飞秒激光对熔融石英进行微加工。研究了烧蚀阈值随脉冲重复频率、扫描速度的变化规律,阐明不同参数下热扩散效应及热累积效应对烧蚀过程的主导作用。在最优化条件下,制作了双线波导,可以对1040nm激光实现圆形基模传输。进一步制作了椭圆晶胞的六角微结构波导,对1040nm激光可以输出近高斯强度分布的基模,模场面积达到247.48μm2。该微结构波导可实现单偏振传输,消光比达9.05,波导数值孔径约0.017。     

Ka-band Wide-Isolation-Bandwidth Waveguide Power Divider Using Microstrip-Probe Isolation Circuit

Journal of Infrared, Millimeter, and Terahertz Waves - A Ka-band wide-isolation-bandwidth waveguide power divider using a microstrip-probe isolation circuit is proposed in this paper. A novel...     

平面光集成器件的时域伪谱法分析

将时域伪谱（PSTD）方法应用于平面光集成器件的分析，推导并实现了可用于PSTD方法的单轴各向异性完全匹配层（UPML）吸收边界条件，讨论了专用于导波结构仿真的一种紧凑的PSTD激励源。并对分布式反馈（DFB）光栅进行了数值模拟，其仿真结果与传统时域有限差分（FDTD）方法相当吻合，但PSTD无论在计算时间还是内存需求方面都大大优于FDTD方法。