中红外-近红外频谱转换是实现诸多中红外波段应用的重要技术，转换效率和调谐范围通常由于泵浦-信号频率失谐量大而受限。提出一种新型As2Se3硫系光波导，通过色散调控对波导结构进行优化设计，使光波导在2 μm波长附近具有正常群速度色散及负的四阶色散，达到泵浦-信号频率失谐量大的四波混频过程的相位匹配。研究了该波导的中红外-近红外频谱转换性能。结果表明，当泵浦光波长位于靠近零色散点的正常色散波长区时，可以实现宽范围可调谐的高效率频谱转换。通过调节泵浦光波长在（1955±30） nm范围内变化，实现了2.7~6.2 μm中红外光波的频谱转换及参量放大，可调谐范围达到3.5 μm。该波导有望应用于宽可调谐中红外激光产生及中红外信号的高灵敏度探测。
非线性光学器件 集成光学器件 群速度色散 四波混频 激光与光电子学进展
2022, 59(3): 0323003
Author Affiliations
Abstract
1 Centre for Optical and Electromagnetic Research, JORCEP, State Key Laboratory for Modern Optical Instrumentation, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Hangzhou 310058, China
2 Key Laboratory of the Ministry of Education on Optoelectronic Information Technology, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
Nonlinear silicon photonics has shown an ability to generate, manipulate, and detect optical signals on an ultracompact chip at a potential low cost. There are still barriers hindering its development due to essential material limitations. In this review, hybrid structures with some specific materials developed for nonlinear silicon photonics are discussed. The combination of silicon and the nonlinear materials takes advantage of both materials, which shows great potential to improve the performance and expand the applications for nonlinear silicon photonics.
Nonlinear optics, integrated optics Nonlinear optical devices Integrated optics materials Photonics Research
2018, 6(5): 05000B13
Author Affiliations
Abstract
Department of Physics, King’s College London, Strand, London WC2R 2LS, UK
Strong nonlinearity of plasmonic metamaterials can be designed near their effective plasma frequency in the epsilon-near-zero (ENZ) regime. We explore the realization of an all-optical modulator based on the Au nonlinearity using an ENZ cavity formed by a few Au nanorods inside a Si photonic waveguide. The resulting modulator has robust performance with a modulation depth of about 30 dB/μm and loss less than 0.8 dB for switching energies below 600 fJ. The modulator provides a double advantage of high mode transmission and strong nonlinearity enhancement in the few-nanorod-based design.
Surface plasmons Metamaterials Nonlinear optical devices Nonlinear optics, integrated optics Photonics Research
2018, 6(5): 050000B1
Author Affiliations
Abstract
1 Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France
2 Laboratoire Charles Fabry, Institut d’Optique, CNRS, Université Paris-Sud,2 Avenue Augustin Fresnel, 91127 Palaiseau Cedex, France
We investigate in this paper the influence of slow light on the balance between the Kerr and two-photon absorption (TPA) processes in silicon slotted hybrid nonlinear waveguides. Three typical silicon photonic waveguide geometries are studied to estimate the influence of the light slow-down factor on the mode field overlap with the silicon region, as well as on the complex effective nonlinear susceptibility. It is found that slotted photonic crystal modes tend to focalize in their hollow core with increasing group index (nG) values. Considering a hybrid integration of nonlinear polymers in such slotted waveguides, a relative decrease of the TPA process by more factor of 2 is predicted from nG 10 to nG 50. As a whole, this work shows that the relative influence of TPA decreases for slotted waveguides operating in the slow light regime, making them a suitable platform for third-order nonlinear optics.
Photonic crystals Photonic crystals Photonic crystal waveguides Photonic crystal waveguides Nonlinear optical devices Nonlinear optical devices Nonlinear optics Nonlinear optics integrated optics integrated optics Photonics Research
2016, 4(6): 06000257
Author Affiliations
Abstract
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2 Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Deposition of two-dimensional (2D) MoS2 materials on the tapered fiber allows various photonic applications including saturable absorbers and four-wave mixing. Ethanol catalytic deposition (ECD) of MoS2 on the optical tapered fiber was proposed and demonstrated in this work. Different from the conventional optical driven deposition using water or organic solvent, the ECD method utilized the high volatility of the ethanol solvent, which significantly increased the movement speed of the MoS2 nanosheets and thus boosted the deposition rate and reduced the minimum power threshold to drive the deposition. We believe the ECD method should be able to be applied to other similar 2D materials such as other types of transition metal chalcogenides.
Nonlinear optical materials Deposition and fabrication Nonlinear optical devices Photonics Research
2015, 3(3): 0300A102
Author Affiliations
Abstract
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
In visible light communication, orthogonal frequency division multiplexing (OFDM) is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode (LED) suppresses the transmission performance. The low-frequency part of the transmitted signal from LED suffers more from nonlinearity. Therefore, a pre-equalization scheme which suppresses the low frequency part of the OFDM signal and enhances the high frequency part can decrease the impact of LED nonlinearity. The experimental results show that the bit-error rate performance is largely enhanced by the pre-compensation.
230.4320 Nonlinear optical devices 230.3670 Light-emitting diodes 060.0060 Fiber optics and optical communications Chinese Optics Letters
2015, 13(7): 072302
Author Affiliations
Abstract
1 Femtosecond Optics Group, Department of Physics, Imperial College London, SW7 2AZ, UK
2 Cambridge Graphene Centre, University of Cambridge, Cambridge, CB3 0FA, UK
Few-layer molybdenum disulfide (MoS2) is emerging as a promising quasi-two-dimensional material for photonics and optoelectronics, further extending the library of suitable layered nanomaterials with exceptional optical properties for use in saturable absorber devices that enable short-pulse generation in laser systems. In this work, we catalog and review the nonlinear optical properties of few-layer MoS2, summarize recent progress in processing and integration into saturable absorber devices, and comment on the current status and future perspectives of MoS2-based pulsed lasers.
Lasers Lasers pulsed pulsed Nanomaterials Nanomaterials Nonlinear optical materials Nonlinear optical materials Nonlinear optical devices Nonlinear optical devices Photonics Research
2015, 3(2): 02000A30
Author Affiliations
Abstract
Dipartimento di Ingegneria Dell’Informazione, Università degli Studi di Parma,Viale delle Scienze 181/A, Parma 43124, Italy
We study a nonlinear lossless polarizer (NLP), a fiber-based device able to control the polarization of an optical signal while preserving its energy. The NLP exploits the lossless polarization attraction (LPA) generated by the Kerr interactions between the signal and a fully polarized continuous wave (CW) pump. By employing a copropagating pump, we show that the effectiveness of LPA depends on the joint action of the Kerr nonlinearity and the mutual delay between signal and pump. We find the optimal pump wavelength placement and demonstrate that true LPA occurs only within a limited range of delay values. Thus, we explain why the copropagating NLP is more flexible and power efficient compared with the traditional counterpropagating NLP.
Nonlinear optics Nonlinear optics fibers fibers Polarization-selective devices Polarization-selective devices Nonlinear optical devices Nonlinear optical devices All-optical devices All-optical devices Photonics Research
2015, 3(5): 05000229
Author Affiliations
Abstract
Institute of Optical Information, Key Lab of Luminescence and Optical Information Technology, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
Based on the general mechanism of the coherent population oscillations, we propose the fundamental -harmonic fractional delay (FHFD) to evaluate the superluminal and slow light propagation in semiconductor optical amplifier (SOA). The sinusoidal and square-wave signals in SOA are investigated with the propagation equations. It is shown that the superluminal and slow light always accompany the signal distortion, and FHFD depends on the signal distortion as well as the incident power, the modulation frequency, and the optical gain.
190.4380 Nonlinear optics, four-wave mixing 250.5980 Semiconductor optical amplifiers 230.4320 Nonlinear optical devices Chinese Optics Letters
2015, 13(s1): S11902
Author Affiliations
Abstract
State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
The dynamic characteristics are investigated for a microring laser with an external radius of 12 μm subject to external optical injection. Single-mode operation with a side mode suppression ratio of 33.4 dB is realized at a biasing current of 25 mA and a temperature of 290 K, and the corresponding small-signal modulation response is obtained with a resonance peak frequency of 7.5 GHz. Under the optical injection from a tunable laser, the improvements of the small-signal modulation response induced by four-wave mixing are observed for the microring laser, which shows an additional resonance peak around the frequency of the beat frequency between the lasing mode and the injecting light. Furthermore, optical generation of a microwave signal is realized by the light beating between the lasing mode and the injecting light measured by a high-speed photodetector and a spectrum analyzer.
Nonlinear optical devices Nonlinear optics four-wave mixing Semiconductor lasers Photonics Research
2014, 2(6): 06000177
