一种基于聚合物材料的延迟线阵列与热光开关集成器件的设计

设计了一种基于聚合物材料的延迟线阵列与热光开关的集成器件.利用Rsoft软件设计并模拟了多模干涉热光开关的性能,可实现输出光场强度随电极加热温度变化.设计了螺旋结构的延迟线阵列,利用BPM软件对螺旋结构波导进行数值模拟,综合考虑器件尺寸和损耗参量设计出螺旋结构的弯曲半径.将延迟线阵列结构与热光开关进行集成,能够实现热光控制的聚合物延迟线阵列,该器件可实现的最大延迟时间为399.4ps,延迟间隔为9.2ps.以SiO2为下包层,SU-8紫外固化光刻胶为波导芯层,聚甲基丙烯酸甲脂为上包层,采用旋涂、光刻、湿法腐蚀等工艺制备了1×4延迟线阵列与MMI热光开关的集成器件,测试得到了延迟线阵列的近红外输出光斑,插入损耗为15~19dB.     

单侧耦合16通道100GHz硅基二氧化硅阵列波导光栅的研制

介绍了一种新型单侧耦合16通道、100GHz通道间隔的硅基二氧化硅阵列波导光栅(AWG)。通过增加一个Y分支波导结构,将AWG的输入、输出波导等间距整齐排列,仅用一个光纤阵列(FA)就可以对AWG器件进行耦合封装。这种AWG的结构设计可有效地减小器件尺寸和增加波导结构的弯曲半径,可减少器件的抛光和耦合时间,可降低器件的成本。     

新型非对称Y分支波导设计与分析

非对称型Y分支波导是用于实现分支波导光功率非均分输出的重要单元器件,在集成光子器件中有广泛应用.基于全内反射原理,提出了一种新型非对称Y分支波导,通过将左右分支波导相对于输入波导在横向方向上进行偏移以实现特定分束比光输出,并对其光学特性进行模拟分析.结果表明,该波导结构不仅能实现任意特定分束比光输出,在分支角达到14°条件下其输出损耗仅为0.417 dB,而且偏振依赖性低、工艺制作难度小,这种新型非对称Y分支波导在集成光子器件中具有重要应用意义.     

质子交换Y分支光波导弯曲损耗研究

对采用退火质子交换技术(APE)制备的具有正弦型弯曲和余弦型弯曲两种不同的S型弯曲的Y分支光波导,利用宽角有限差分光束传播法,就过渡区长度、波导表面折射率增量、掩模版开口宽度等对波导弯曲损耗的影响进行了研究。结果表明,两种S弯曲下的Y分支波导的弯曲损耗,随波导结构参数的变化基本上是相同的,但二者的表现并不完全一致。数值计算结果为相应波导器件的设计和制备提供了一定的参考。     

小型铌酸锂多功能集成光学器件

为满足小型光纤陀螺对光学器件小体积的要求,对铌酸锂多功能集成光学小型化器件的结构做了分析和优化设计。采用BPM软件分析了Y形分支波导的S形波导损耗与弯曲长度及折射率差的关系。通过调整退火质子交换的工艺参数,增加了波导对光的束缚能力;降低了小型化芯片上S形波导的弯曲损耗;去掉了原有Y形波导的输出端直波导,直接由S形弯曲波导引至输出端,在更短的芯片上得到了更长的弯曲过渡区。设计制作的芯片长度由常规的20 mm减至12.5 mm,封装后的器件长度减小到20 mm,为目前同类常规器件尺寸的2/3。设计制作的器件插入损耗典型值小于2.5 dB,全温损耗变化量小于0.2 dB。     

弯曲波导研究进展及其应用

本文主要分析了弯曲波导损耗机理,包括传输损耗、辐射损耗、模式转换损耗。重点综述了设计低损耗弯曲波导的方法,包括波导材料、弯曲波导的曲线形状、波导种类、脊型波导的宽度、脊高、弯曲半径、模场分布、弯曲波导曲线形状和其他新型波导结构等。简要概括了近年来设计和制备低损耗弯曲波导的代表性工作。介绍了弯曲波导在集成光学中的应用。通过对弯曲波导的损耗及耦合机制理论的不断完善,实现光在较小弯曲半径的低损耗传输,从而提高集成光学的集成度是弯曲波导今后的发展趋势。     

基于Y型分支与布拉格光栅结构的集成光芯片研究

采用Y型分支与深刻蚀布拉格波导光栅相集成的方案,制备了带有通道监控功能的1×8光分路器集成芯片。耦合封装后的集成光芯片同时实现了稳定的通道光信号传输与监控功能。集成光芯片8通道反射谱中心波长范围为1 597 nm～1 639 nm,间隔为6 nm,3 dB带宽最大为0.67 nm,通道反射率最低为88.24%。1 550 nm波长下测试8通道的平均插损为11.92 dB,输出均匀性为0.19 dB。本文设计并制备的集成光芯片结构简单、集成化高,可以应用于光纤到户建设及其他光网络传输中,实现网络链路状态的实时监控。     

集成光学 集成光学、波导理论

TN252 2005053598 两种不同Y分支光波导的弯曲损耗研究=Bending loss of two kinds of Y-branch optical waveguides[刊,中]／郑宏林 (电子科技大学宽带光纤传输与通信网技术教育部重点实 验室.四川,成都(610054)),陈福深∥半导体光电．- 2005,26(1)．-30-33 针对低损耗S型弯曲Y分支的分析与设计,分别用弯 曲损耗理论和有限差分光束传输法分析了两种不同的S 型弯曲Y分支的损耗特性,比较了不同的波导宽度、分支 间距和分支张角对波导输出损耗特性的影响,得出了一组 最优化的Y分支波导设计参数。图5参5(严寒)     

基于热膨胀效应的可调光功率分束器设计

可调光功率分束器是集成光子系统中的重要功能器件,其光功率输出具有动态可调控特性,诸多光子系统对其有着广泛需求.本文基于空隙槽型Y分支波导结构,利用热膨胀效应,提出了一种新型可调光功率分束器实现方法,通过调控温度来改变分支处空隙槽的宽度,以实现其分支波导的光功率输出的动态变化.采用有限元方法,对其热膨胀形变和光学性能进行了模拟分析.其模拟结果表明,该器件能实现大范围光分束调控,且对波长和偏振态依赖性低;同时,该器件具有结构简单、易于设计和制作、易于调控等优点,这种新型器件在各种光子系统中具有重要应用前景.     

基于表面等等离波子的新型Y分支波导

新型高效的纳米光波导器件的研制纳米集成光学的核心技术之一。Y分支波导作为最基本的分光和光路连接元件是纳米光学器件设计与制备的基础。运用时域有限差分(FDTD)法,模拟计算了基于表面等等离波子(SPP)的纳米Y分支波导的传输特性。结果表明,该新型Y分支波导在光通信波段可以实现大角度的分光功能,且在180°分支情况下,传输效率仍高达92.8%以上。另外,该波导还具有导波性能良好、对分叉处间隙缺陷大小不敏感及制作容差较大和器件尺寸在纳米量级等特点。对该新型光波导器件的研究为未来纳米集成光学器件的研制和应用有一定的指导意义。     

数值模拟二维间隙表面等离子波导传输特性

利用表面等离子激元的新颖特性,设计了二维间隙表面等离子波导.以这种结构为基础通过变形和组合形成90°直角弯曲波导、T型光功率分配器和光开光,采用时域有限差分法研究了它们的传输特性.结果表明:不同于介质光波导的弯曲损耗来自于辐射泄漏,90°直角弯曲间隙表面等离子波导的能量损耗主要来自于金属中的欧姆热损耗.在间隙达到40 nm以上后,当直行段的长度适当时,弯曲段的透射率较相同长度的直波导的透射率要大.T型光功率分配器在两输出波导的间隙宽度比达到0.6及以上时,不同于传统介质波导的分光原则,能量主要沿等效折射率较小的输出臂流出.当两输入光的相位反相时,T型光开关处于输出截止的状态,当两输入光的相位同相时,T型光开关处于输出导通的状态.所有波导间隙均小于衍射极限,实现了超衍射极限传播,可用于未来了超大规模集成光路中.     

Integrated optical temporal Fourier transformer based on a chirped Bragg grating waveguide

We experimentally demonstrate the first integrated temporal Fourier transformer based on a linearly chirped Bragg grating waveguide written in silica glass with a femtosecond laser. The operation is based on mapping the energy spectrum of the input optical signal to the output temporal waveform by making use of first-order chromatic dispersion. The device operates in reflection, has a bandwidth of 10 nm, and can be used for incident temporal waveforms as long as 20 ps. Experimental results, obtained through both temporal oscilloscope traces and Fourier transform spectral interferometry, display a successful Fourier transformation of in-phase and out-of-phase pairs of input optical pulses, and demonstrate the correct functionality of the device for both amplitude and phase of the temporal output.     

Splitting-on-demand optical power splitters using multimode interference (MMI) waveguide with programmed modulations

Reconfigurable multi-channel optical power splitter is proposed and its optical properties are calculated. The device can dynamically reconfigure the number of splitting channels by providing programmed refractive index modulations on a multimode interference (MMI) waveguide. A reconfigurable 3-channel optical power splitter is designed to work as 1 × 1, 1 × 2 or 1 × 3 optical power splitter depending on the state of the heat electrodes using thermo-optic modulation, and the input light can be distributed to three output channels with sequential orders. The device can work in the whole C-band (1530-1565 nm) with extinction ratio better than −29.0 dB, excess loss better than −0.45 dB, imbalance better than 0.08 dB and polarization dependent loss (PDL) better than 0.14 dB. The design conception is scalable to a multi-channel splitting-on-demand optical power splitter which can divide input light to 1, 2, …, N output channels equally by using the 3-channel reconfigurable optical power splitter as a building block.     

Design and Evaluation of an N:N Optical Coupler Using an Integrated Waveguide Mirror

We proposed and fabricated an N:N optical coupler using an integrated waveguide mirror. Optical circuits can be miniaturized with small bending by reflecting mirrors. The parabolic curve was applied to the mirror shape because it was necessary to collimate the reflected beam so as to distribute the input light to the output waveguides. We fabricated the 8:8 optical coupler using silica waveguide. The chip size was about 7mm x 15mm. The excess loss of the device was about 8 dB larger than simulation results calculated using beam propagation method. The dependence on the wavelength and polarization was about 0.4 and 0.15 dB, respectively. The excess loss was mainly attributed to the mirror tilt and will be reduced by optimizing the etching conditions to decrease the mirror tilt angle.     

Quasi-group-velocity matching using integrated-optic structures

We propose a device to compensate for group-velocity mismatch (GVM) effects that limit the efficiency-bandwidth product in nonlinear frequency-mixing devices. Integrated wavelength-dependent delay lines are introduced periodically in a waveguide containing a series of quasi-phase-matching (QPM) gratings. Appropriate choice of the time delays can compensate for GVM. We have demonstrated a two-stage device in a periodically poled lithium niobate waveguide. Two approximately 150-fs-long pulses generated 6 ps apart by second-harmonic generation in two QPM gratings were resynchronized by a fixed delay line, and their relative phase was fine controlled by temperature tuning. This technique, which can be iterated to more than two segments, permits optical frequency mixers with a higher efficiency-bandwidth product than would be possible in a single grating short enough to avoid GVM effects.     

Acrylic and metal based Y-branch plastic optical fiber splitter with optical NOA63 polymer waveguide taper region

We proposed a simple low-cost acrylic and metal-based Y-branch plastic optical fiber (POF) splitter which utilizes a low cost optical polymer glue NOA63 as the main waveguiding medium at the waveguide taper region. The device is composed of three sections: an input POF waveguide, a middle waveguide taper region and output POF waveguides. A desktop high speed CNC engraver is utilized to produce the mold inserts used for the optical devices. Short POF fibers are inserted into the engraved slots at the input and output ports. UV curable optical polymer glue NOA63 is injected into the waveguide taper region and cured. The assembling is completed when the top plate is positioned to enclose the device structure and connecting screws are secured. Both POF splitters have an average insertion loss of 7.8 dB, coupling ratio of 55: 45 and 57: 43 for the acrylic and metal-based splitters respectively. The devices have excess loss of 4.82 and 4.73 dB for the acrylic and metal-based splitters respectively.     

Suspended bridge-like silica 2×2 beam splitter on silicon

We report a successful experimental realization of a 2×2 suspended silica splitter integrated on a silicon substrate. The silica splitter was photo-lithographically patterned, etched, and reflowed to form the suspended and rounded silica waveguide channels. The silica splitter showed a flat splitting ratio and excess loss over a wide wavelength range from 1520 to 1630 nm with a low crosstalk. Additionally, as a result of the very low nonlinear coefficients of silica, the splitting ratio is independent of input power.     

Fabrication of 1×2 asymmetric plastic optical fiber coupler for portable optical access-card system

We proposed a simple low-cost acrylic and metal-based Y-branch plastic optical fiber (POF) splitter which utilizes a low cost optical polymer glue NOA63 as the main waveguiding medium at the waveguide taper region. The device is composed of three sections: an input POF waveguide, a middle waveguide taper region and output POF waveguides. A desktop high speed CNC engraver is utilized to produce the mold inserts used for the optical devices. Short POF fibers are inserted into the engraved slots at the input and output ports. UV curable optical polymer glue NOA63 is injected into the waveguide taper region and cured. The assembling is completed when the top plate is positioned to enclose the device structure and connecting screws are secured. Both POF splitters have an average insertion loss of 7.8 dB, coupling ratio of 55: 45 and 57: 43 for the acrylic and metal-based splitters respectively. The devices have excess loss of 4.82 and 4.73 dB for the acrylic and metal-based splitters respectively.     

特种非对称低损耗1×5光分路器

设计和优化了一种新型低损耗、低偏振的基于二氧化硅的特种非对称1×5光分路器.在设计Y分支结构时,输入端采用缓变展宽波导结构和直波导过渡波导相结合的结构,此结构可以使输入光场缓慢展宽,进行分束前的准备,大大减小分支结构的辐射损耗和模式转换损耗.非对称1×5光分路器第一个端口输出功率占50%,第二至五端口输出功率占50%.利用三维光束传播法模拟和优化了特种非对称1×5光分路器,模拟结果表明,该结构具有均匀性好、器件尺寸小、低损耗和低偏振等优点,1×5光分路器在1 250~1 650 nm波长范围内,第一个输出端口附加损耗小于0.07 dB,均匀性小于0.023 dB,偏振相关损耗小于0.009 dB,第二到五端口附加损耗小于0.45 dB,均匀性小于0.41 dB,偏振相关损耗小于0.06 dB.     

一种基于机器视觉的平面光波导器件封装手动耦合系统

对平面光波导器件封装手动耦合系统进行了改进,增加了3个黑白摄像头,3张AV转USB采集卡,通过采集卡采集对准图像,利用LabVIEW8.2和IMAQ vision软件编程,将图片进行BCG调节、反转、闭合、边缘提取、手动阈值、形态学变化、直线拟合等一系列处理和识别后,实现了对光波导分路器与输入、输出光纤阵列的平行度和像素距离的检测,以一个熟练工封装132路平面光波导来说平均节省了对接封装时间10 min,减少了操作者的劳动量,减小了对准损耗,减小了人为误差。