电子科技大学光电科学与工程学院，四川 成都 611731
提出了一种基于级联非对称Y分支的紧凑、宽带、高效的LP01-LP11a模式转换器。制作的聚合物波导模式转换器具有1.5 mm×14.0 μm的紧凑尺寸，对于C+L波段的x偏振和y偏振光，其模式转换效率大于98%，串扰小于-17.5 dB，插入损耗低于5.8 dB。所提出的模式转换器可以应用在宽带模分复用传输系统中。
光纤光学 光学器件 模式转换器 模分复用 聚合物波导 集成光学 非对称Y分支
1 中国科学院深圳先进技术研究院, 广东 深圳 518055
2 深南电路股份有限公司, 广东 深圳 518117
3 上海交通大学区域光纤通信网与新型光通信系统国家重点实验室, 上海 200240
现有的柔性波导器件存在加工制备难、机械柔韧性有限、可靠性程度低等难题。基于中性面理论,以聚酰亚胺(PI)薄膜为衬底,设计并制作了具有三明治叠层结构的柔性多模聚合物波导,通过多层中性面的构筑赋予柔性波导优异的结构可靠性和机械柔韧性。所制备的柔性聚合物波导具有低传输损耗(0.16 dB/cm@850 nm)和低通道串扰(<-40 dB)的特性。通过微机械设计使在机械变形过程中施加在波导芯层上的应变最小化,波导表现出优良的机械弯曲性能,其最小弯曲半径低至3 mm,且以1 mm弯曲半径弯曲1000次后,其传输损耗无明显增加。可靠性测试实验结果表明,柔性波导具有优异的热稳定性、耐老化性能以及可加工性能,经过湿度循环、温度循环以及无铅回流焊处理后,波导的传输性能并未发生明显劣化。该研究为具有优异机械柔性和环境可靠性的柔性聚合物波导的规模化生产和应用提供了一定的理论与技术指引。
光学器件 柔性聚合物波导 传输损耗 通道间串扰 性能可靠性
1 西安理工大学自动化与信息工程学院, 陕西 西安 710048
2 西安工业大学光电工程学院, 陕西 西安 710021
光纤与平面光波导高效耦合是光波导器件互联设计中的重要环节,常用的倒锥波导已经解决了光纤与波导芯片之间的模式不匹配问题。然而,高折射率差波导与光纤耦合时通常需要较小的尖端尺寸(<180 nm),加工复杂且波导易坍塌。设计了一种宽波段(可见光和近红外波段)光纤-波导水平耦合器,通过引入聚合物SU-8锥形结构,提高了三端口分支波导的线宽,实现了850 nm波段超过300 nm的1 dB有效带宽。
集成光学 耦合器 波导 光通信 聚合物波导
Author Affiliations
Abstract
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
We analyze and explore the potential of using a polymer horizontal slot waveguide as light-analyte interactive region to implement a low-cost and highly sensitive liquid refractive index sensor. Numerical analysis shows that the optimized polymer horizontal slot waveguide is able to realize high waveguide sensitivity. With the optimized horizontal slot waveguide, polymer liquid refractive index sensors based on Mach-Zehnder interferometer (MZI) and microring resonator (MRR) are then investigated numerically, and the results show that the MZI-based sensor can achieve high sensitivity of 17024 nm/RIU and low limit of detection (LOD) of 1.76×10-6 RIU while the MRR-based sensor can achieve the sensitivity of 177 nm/RIU and the LOD of 1.69×10-4 RIU with a very small footprint. Compared with the sensors employing conventional silicon or silicon nitride vertical slot waveguide, the sensors employing polymer horizontal slot waveguide exhibit comparable performances but simpler and lower fabrication costs.
Integrated optics devices polymer waveguides sensors waveguides Photonic Sensors
2020, 10(1): 7
Author Affiliations
Abstract
1 School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2 Hansen Experimental Physics Laboratory, Department of Physics, Stanford University, Stanford 94305, USA
We propose a novel structure and unique sensing mechanism bio-chemical sensor which is fabricated by a polymer long-period waveguide grating with the detection liquid directly as the waveguide cladding. Quantitative detection is realized from analyzing the output absorption spectrum and resonant wavelength shift related to the liquid detection concentration. The proposed polymer long-period waveguide grating based liquid refractive-index sensor is developed experimentally, the high sensitivity of 1.01 × 104 nm/RIU is achieved, and the temperature stability coefficient is 1.47 nm/℃. Theoretically and experimentally, this work has been demonstrated to have potential application in chemical and biological detections and may provide an important technical support for solving today’s increasingly serious civil problems such as food safety and drug safety, which will also have the important scientific significance and application prospects.
Optical sensor polymer waveguides long-period waveguide gratings liquid cladding Photonic Sensors
2019, 9(1): 0119
Author Affiliations
Abstract
1 Department of ECE, Drexel University, Philadelphia, PA 19104 USA
2 IETR, Université Bretagne Loire, University of Nantes, 44322 Nantes, France
3 Thales Research and Technology France, 91767 Palaiseau, France
This Letter introduces the design and simulation of a microstrip-line-based electro-optic (EO) polymer optical phase modulator (PM) that is further enhanced by the addition of photonic crystal (PhC) structures that are in close proximity to the optical core. The slow-wave PhC structure is designed for two different material configurations and placed in the modulator as a superstrate to the optical core; simulation results are depicted for both 1D and 2D PhC structures. The PM characteristics are modeled using a combination of the finite element method and the optical beam propagation method in both the RF and optical domains, respectively. The phase-shift simulation results show a factor of 1.7 increase in an effective EO coefficient (120 pm/V) while maintaining a broadband bandwidth of 40 GHz.
230.0230 Optical devices 250.0250 Optoelectronics 130.0130 Integrated optics 130.0250 Optoelectronics 130.4110 Modulators 130.5296 Photonic crystal waveguides 130.5460 Polymer waveguides 160.2100 Electro-optical materials 160.4236 Nanomaterials Chinese Optics Letters
2017, 15(1): 010003
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
100-GHz cross-cascaded arrayed waveguide gratings (AWGs)-based wavelength selective optical switching optical cross-connects (OXCs) modules with Mach-Zehnder interferometer (MZI) thermo-optic (TO) variable optical attenuator (VOA) arrays and optical truetime- delay (TTD) line arrays is successfully designed and fabricated using polymer photonic lightwave circuit. Highly fluorinated photopolymer and grafting modified organic-inorganic hybrid material were synthesized as the waveguide core and cladding, respectively. The one-chip transmission loss is ~6 dB and the crosstalk is less than ~30 dB for the transverse-magnetic (TM) mode. The actual maximum modulation depths of different thermo-optic switches are similar, ~15.5 dB with 1.9 V bias. The maximum power consumption of a single switch is less than 10mW. The delay time basic increments are measured from 140 to 20 ps. Proposed novel module is flexible and scalable for the dense wavelength division multiplexing network.
polymer waveguides polymer waveguides photosensitive materials photosensitive materials integrated optics devices integrated optics devices photonics integrated circuits photonics integrated circuits Frontiers of Optoelectronics
2016, 9(3): 428
北京交通大学光电子技术研究所 发光与光信息技术教育部重点实验室, 北京 100044
研究了温度对聚合物poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT)和poly(3-hexylthiophene) (P3HT)共混薄膜的放大自发辐射(ASE)的影响。在80～320 K温度范围测试了不同P3HT质量比的共混聚合物薄膜和纯F8BT薄膜的ASE特性。在室温条件下, 共混聚合物的阈值随着P3HT所占比例的增加先降低后升高。当P3HT比例约为20%时, 阈值最低约为2.59×103 W/cm2。当温度从320 K下降到80 K时, 纯F8BT薄膜的ASE阈值光功率由5.36×103 W/cm2下降到4.15×103 W/cm2, P3HT质量比为20%的共混薄膜的ASE阈值光功率由2.84×103 W/cm2下降到2.03×103 W/cm2。在一特定泵浦光功率(5.29×103 W/cm2)下, 当温度由320 K下降至80 K时, ASE强度约提高4倍。随着温度的降低, 混合物薄膜的ASE峰位红移, 移动达12 nm。
放大的自发辐射 温度效应 聚合物共混波导 阈值 amplified spontaneous emission temperature dependence blend polymer waveguides threshold
Author Affiliations
Abstract
1 Microelectronic Research Center, Department of Electrical and Computer Engineering, The University of Texas atAustin, Austin, Texas 78758, USA
2 Omega Optics, Inc., 8500 Shoal Creek Blvd, Austin, Texas 78757, USA
3 Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Ave, Ann Arbor,Michigan 48109, USA
4 Microelectronic Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA
A mode transformer based on the quasi-vertical taper is designed to enable high coupling efficiency for interboardlevel optical interconnects involving single-mode polymer waveguides and standard single-mode fibers. A triangular region fabricated above the waveguide is adopted to adiabatically transform the mode from the fiber into the polymer waveguide. The effects of the geometrical parameters of the taper, including width, height, tip width, etc., on the coupling efficiency are numerically investigated. Based on this, a quasi-vertical taper for the polymer rib waveguide system is designed, fabricated, and characterized. Coupling losses of 1.79 _ 0.30 and 2.23 _ 0.31 dB per coupler for the quasi-TM and quasi-TE mode, respectively, are measured across the optical communication C and L bands (1535 to 1610 nm). Low-cost packaging, leading to widespread utilization of polymeric photonic devices, is envisioned for optical interconnect applications.
Buffers Buffers couplers couplers routers routers switches switches and multiplexers and multiplexers Fibers Fibers single-mode single-mode Optical communications Optical communications Polymer waveguides Polymer waveguides Optical design and fabrication Optical design and fabrication Micro-optical devices Micro-optical devices Photonics Research
2015, 3(6): 06000317
北京交通大学光电子技术研究所 发光与光信息技术教育部重点实验室, 北京100044
研究了聚合物poly (9,9-dioctylfluorene-co-benzothiadiazole) (F8BT)和poly (3-hexylthiophene) (P3HT)共混薄膜的放大自发辐射(ASE)现象, 对影响其阈值的两个因素——增益和损耗进行了详细的研究。结果显示, 共混聚合物的发光效率随着P3HT所占比例的增加有所降低。当P3HT比例低于20%时, 发光效率降低不多, 而其损耗则随着P3HT的增加显著减小。F8BT和P3HT混合后, 光损耗系数从7.8 cm-1下降到4 cm-1左右。这表明F8BT∶P3HT共混聚合物光波导的ASE阈值降低主要是由于其损耗的降低而导致的。ASE阈值的降低预示该材料体系容易实现电泵浦激光。
放大的自发辐射 聚合物共混波导 阈值 发光效率 损耗系数 amplified spontaneous emission blend polymer waveguides threshold photoluminescence quantum efficiency loss coefficient
