发布求助
文献互助 智能选刊 最新文献

Photonics Asia最新文献

筛选
英文 中文
Design and optimization of a widely tunable semiconductor laser for blood oxygenation and blood flow measurements 用于血液氧合和血流测量的广泛可调谐半导体激光器的设计和优化
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073345
Yafei Feng, Haoyu Deng, Guangyi Song, Jian-jun He
{"title":"Design and optimization of a widely tunable semiconductor laser for blood oxygenation and blood flow measurements","authors":"Yafei Feng, Haoyu Deng, Guangyi Song, Jian-jun He","doi":"10.1117/12.2073345","DOIUrl":"https://doi.org/10.1117/12.2073345","url":null,"abstract":"A method for measuring blood oxygenation and blood flow rate using a single widely tunable semiconductor laser is proposed and investigated. It is shown that a 700-nm-band tunable laser gives the highest sensitivity for blood oxygen measurement. The corresponding tunable laser is designed using the V-coupled cavity structure. The wavelength tuning range can reach 8 nm, which is sufficient for the blood oxygenation measurement in the 700-nm-band by using the Beer- Lambert law. In contrast to conventional blood oxygenation measurement method based on two LEDs, the laser can be used at the same time to measure the blood flow rate based on the Doppler principle.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124862835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Thermal instability in plasmonics 等离子体中的热不稳定性
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2084724
A. Sarychev, I. Fyodorov, V. Parfenyev, G. Tartakovsky, S. Vergeles
{"title":"Thermal instability in plasmonics","authors":"A. Sarychev, I. Fyodorov, V. Parfenyev, G. Tartakovsky, S. Vergeles","doi":"10.1117/12.2084724","DOIUrl":"https://doi.org/10.1117/12.2084724","url":null,"abstract":"The quantum-mechanical and thermal phenomena in the plasmonic nanoparticle and resonator are investigated. We develop quantum plasmonics by quantizing the collective electron motion in the surface plasmon. The operator of the electric field inside the metal nanoparticle is found. Thus obtained quantum electric field is anomalous large even for few plasmon quanta. The strong electric field, which value is comparable with the atomic field, results in huge electric current and overheating the metal nanoparticle when it operates as a resonator for the plasmon laser (SPASER). It is shown the overheating thermal instability can explode the particle.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121488905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Super-Nyquist signal transmission and digital signal processing 超级奈奎斯特信号传输和数字信号处理
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2071275
Junwen Zhang, Jianjun Yu, N. Chi
{"title":"Super-Nyquist signal transmission and digital signal processing","authors":"Junwen Zhang, Jianjun Yu, N. Chi","doi":"10.1117/12.2071275","DOIUrl":"https://doi.org/10.1117/12.2071275","url":null,"abstract":"Super-Nyquist, also known as Fast-than-Nyquist (FTN), signal generation based on optical or electrical spectrum shaping methods has been demonstrated to be an efficient scheme for future high-capacity transmission systems. Super- Nyquist signal demodulations based on maximum a posteriori (MAP) or maximum likelihood sequence estimation (MLSE) on receiver side have been demonstrated in 100G, 200G and 400G systems, which enables PDM-QPSK transmission with 4bit/s/Hz net spectral efficiency (SE) at lower OSNR requirement and longer transmission distance. Further studies also show the highly filtering-tolerant advantage of the super-Nyquist signal when using the 9-QAMbased multi-modulus equalization. This feature is quite useful for signals transmission under the aggressive optical filtering in multiple reconfigurable optical add-drop multiplexers (ROADMs) transmission link. In this paper, we review the newly reported super-Nyquist experiments using the optical super-Nyquist filtering 9-QAM like signals based on multi-modulus equalization (MMEQ). We directly recover the Nyquist filtered QPSK to a 9-QAM like signal. We first successfully transmitted 100-GHz-grid, 20 channels single-carrier 440-Gb/s super-Nyquist 9-QAM-like signal over 3600-km ultra-large effective-area fiber (ULAF) at record a net SE of 4b/s/Hz (after excluding the 7% hard-decision FEC overhead). The highly filtering-tolerant performance of the 9-QAM liked super-Nyquist signal is also experimentally demonstrated. Using this scheme, we then successfully transmit 10 channels 440-Gb/s signal over 3000- km ULAF and 10 cascaded ROADMs with 100-GHz-grid based on the single-carrier ETDM 110-GBaud QPSK. It is the highest baud rate of all-ETDM signal reported with the highest net SE at this baud rate for PDM-QPSK signal.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114174784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Novel InGaAlAs/InGaAlAs quantum well multimode-interferometer-Fabry-Perot laser diode 新型InGaAlAs/InGaAlAs量子阱多模干涉仪- fabry - perot激光二极管
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2071772
Hua Yang, P. Morrissey, Mingqi Yang, B. Corbett, F. Peters
{"title":"Novel InGaAlAs/InGaAlAs quantum well multimode-interferometer-Fabry-Perot laser diode","authors":"Hua Yang, P. Morrissey, Mingqi Yang, B. Corbett, F. Peters","doi":"10.1117/12.2071772","DOIUrl":"https://doi.org/10.1117/12.2071772","url":null,"abstract":"In this paper, we demonstrate a novel InGaAlAs/InGaAlAs quantum well multimode-interferometer-Fabry-Perot laser diode (MMI-FP LD) in which a 1x3 multimode interferometer is inserted into the conventional FP laser waveguide to generate single wavelength emission. The designed and fabricated laser diode shows a single longitudinal mode lasing with side mode suppression ratio (SMSR) of 25dBm at a wavelength of 1567nm with driving current of 170mA and can be tuned over a certain range by adjusting the driving current. A laser diode incorporating a 1x3 MMI and three single mode waveguide outputs is also proposed which could be potentially used to generate a 3-channel single longitudinal mode coherent source using injection locking. The simple structure of this single longitudinal mode laser significantly eases the fabrication processing enabling an increase in the yield and a reduction in the cost compared with the traditional single mode lasers.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122842375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Narrow linewidth 1.55μm directly modulated distributed-feedback laser 窄线宽1.55μm直调分布反馈激光器
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073979
Jin-Jin Guo, Jianguo Liu, N. Zhu, Wei Chen, W. Sun, Ningbo Huang, Qi Wang
{"title":"Narrow linewidth 1.55μm directly modulated distributed-feedback laser","authors":"Jin-Jin Guo, Jianguo Liu, N. Zhu, Wei Chen, W. Sun, Ningbo Huang, Qi Wang","doi":"10.1117/12.2073979","DOIUrl":"https://doi.org/10.1117/12.2073979","url":null,"abstract":"We fabricated a narrow linewidth 1.55μm directly-modulated distributed-feedback (DFB) laser. The laser exhibits an output power of 14mW at 100mA, flat frequency response with -3 dB bandwidth of 18 GHz, the third-order intermodulation distortion (IMD3) with 39.8dBm, narrow optical linewidth with 181kHz, and RIN below -135.7dB/Hz in the 0.1-10GHz range along with the high side-mode suppression ratio (<52dB). We also experimentally verified the modulation bandwidth, linearity, and linewidth is related to the bias current. The characteristics of the laser, namely sufficient modulation bandwidth, high linearity, low relative intensity noise (RIN) and narrow linewidth, make it the perfect candidates for high dynamic directly modulated analog optical link.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125948393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Mid-infrared pulsed fiber lasers operating at 3μm region 工作在3μm波段的中红外脉冲光纤激光器
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073598
Y. Liu, Jianfeng Li, Luo Yu, Zhiyao Zhang, Heping Li, Xiaojun Zhou
{"title":"Mid-infrared pulsed fiber lasers operating at 3μm region","authors":"Y. Liu, Jianfeng Li, Luo Yu, Zhiyao Zhang, Heping Li, Xiaojun Zhou","doi":"10.1117/12.2073598","DOIUrl":"https://doi.org/10.1117/12.2073598","url":null,"abstract":"Mid-infrared pulsed fiber laser with centered wavelength from 2 to 5 μm have attracted substantial attention owing to their potential applications in defence, laser microsurgery, material processing, nonlinear frequency conversion, etc. We demonstrated our recent achievements at 3 μm pulsed fiber lasers by utilizing Q-switching method. Firstly, a cascaded dual wavelength actively Q-switched Ho3+-doped ZBLAN fiber was reported by inserting an external electrically driven acoustic-optical modulator (AOM) into the cavity. The 3.0 μm and 2.07 μm pulse trains were achieved with a μs level time delay corresponding to the pulse energy of 29 μJ and 7 μJ, pulse duration of 380 ns and 260 ns, respectively. The narrower pulse width in this case compared to that in passively Q-switched fiber lasers can be attributed to the much higher modulation depth of AOM. Using a reversely designed semiconductor saturable mirror (SESAM) as the saturable absorber (SA), we presented a passively Q-switched Ho3+-doped ZBLAN fiber laser operating at ~2971 nm, the obtained maximum pulse energy of 6.65 μJ only limited by the maximum pump power was also the highest level from passively Q-switched fiber lasers at this wavelength range, and corresponding pulse repetition rate and duration were 47.6 kHz and 1.68 μs, respectively. Then using a Fe2+: ZnSe crystal with an initial transmission of 69 % as the SA, a passively Q-switched Ho3+-doped ZBLAN fiber laser operating at 2970.3 nm was also achieved. The obtained pulse duration and repetition rate were 1.92 μs and 62.74 kHz, respectively with an output power of 266 mW and a pulse energy of 4.24 μJ. The further performance improvements were possible because they were just limited by the maximum pump power. To sum up, the above achievements would be beneficial for further development of mid-infrared pulsed fiber lasers.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"324 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123169219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tunable V-coupled-cavity semiconductor laser monolithically integrated with monitoring photodiodes using deeply etched reflective trenches 可调谐v型耦合腔半导体激光器与使用深蚀刻反射沟槽的监测光电二极管单片集成
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073603
Xiaolu Liao, Jianjun Meng, Jian-jun He
{"title":"Tunable V-coupled-cavity semiconductor laser monolithically integrated with monitoring photodiodes using deeply etched reflective trenches","authors":"Xiaolu Liao, Jianjun Meng, Jian-jun He","doi":"10.1117/12.2073603","DOIUrl":"https://doi.org/10.1117/12.2073603","url":null,"abstract":"We present a 1560-nm-band digitally wavelength tunable V-coupled-cavity semiconductor laser monolithically integrated with two waveguides based monitoring photodiodes (MPD) through deeply etched reflective trenches. The reflective trenches are designed to be 1.16μm wide, about three quarters of the wavelength, and are deeply etched through the waveguide with a depth larger than 4μm. Due to the high reflectivity of the etched trenches, a low threshold current of 19mA is achieved. Using a single electrode control, wavelength tuning of 22 channels at 100GHz spacing with SMSR above 35 dB is obtained. The relationship between the photocurrents of the two MPD at the two waveguide branches and the laser output power from the coupler side is investigated as a function of the wavelength. Since the integrated tunable laser with MPDs is very compact and does not involve any grating or epitaxial regrowth, it is suitable for low-cost multifunctional photonic applications for access and data center networks.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131619508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An asymmetric sampled Bragg grating structure for improving semiconductor laser efficiency 用于提高半导体激光器效率的非对称采样布拉格光栅结构
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073460
Yating Zhou, Gang Wang, Hong Zhu, Jun Lu, Xiangfei Chen
{"title":"An asymmetric sampled Bragg grating structure for improving semiconductor laser efficiency","authors":"Yating Zhou, Gang Wang, Hong Zhu, Jun Lu, Xiangfei Chen","doi":"10.1117/12.2073460","DOIUrl":"https://doi.org/10.1117/12.2073460","url":null,"abstract":"An asymmetric sampled Bragg grating (SBG) semiconductor laser, which consists of two sections with same length but different sampling duty cycle, can be introduced an arbitrary equivalent-phase-shift (EPS) into its center. At the same time, to adjust the sampling duty cycles in the two sections as different magnitude, the studied laser can output more lasing power from its one facet than that from the other one. That is to say, this method can be used to design and fabricate the EPS SBG semiconductor laser with higher output efficiency.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130904597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detailed comparison of performance of a Fabry-Perot semiconductor laser under both strong and weak injection 法布里-珀罗半导体激光器在强注入和弱注入下性能的详细比较
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2071843
Yali Zhang, Xuebao Peng, Shang-jian Zhang, Y. Liu
{"title":"Detailed comparison of performance of a Fabry-Perot semiconductor laser under both strong and weak injection","authors":"Yali Zhang, Xuebao Peng, Shang-jian Zhang, Y. Liu","doi":"10.1117/12.2071843","DOIUrl":"https://doi.org/10.1117/12.2071843","url":null,"abstract":"We numerically and experimentally investigate and compare the performance of a Fabry-Perot laser diode (FP-LD) under both strong- and weak-injection in detail. The numerical simulation results prove that the optically injection-locked semiconductor laser will become stable in the injection-locking region under the above two conditions. Nonetheless, the former can achieve stability faster than the latter whatever the frequency detuning is. The dynamic injection-locking map and the property of side-mode suppression ratio (SMSR) for the optically injection-locked FP-LD are experimentally obtained, and associated experiment phenomena are observed and qualitatively discussed for both conditions. Our experiments show that quite different dynamics occur in the two conditions, with weak-injection arrangement offering overall benefits in terms of more complicated dynamics and potential application.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114611233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of phase retrieval algorithm from partially coherent light 部分相干光相位恢复算法研究
Photonics Asia Pub Date : 2014-12-01 DOI: 10.1117/12.2071803
Liu Yan, Cheng Hong, Sui Wei, Zhang Wei
{"title":"Study of phase retrieval algorithm from partially coherent light","authors":"Liu Yan, Cheng Hong, Sui Wei, Zhang Wei","doi":"10.1117/12.2071803","DOIUrl":"https://doi.org/10.1117/12.2071803","url":null,"abstract":"The goal of phase retrieval is to recover the phase information from intensity distribution which is an important topic in optics and image processing. The algorithm based on the transport of intensity equation only need to measure the spatial intensity of the center plane and adjacent light field plane, and reconstruct the phase object by solving second order differential equations. The algorithm is derived in the coherent light field. And the partially coherent light field is described more complex. The field at any point in the space experiences statistical fluctuations over time. Therefore, traditional TIE algorithms cannot be applied in calculating the phase of partially coherent light field. In this thesis, the phase retrieval algorithm is proposed for partially coherent light field. First, the description and propagation equation of partially coherent light field is established. Then, the phase is retrieved by TIE Fourier transform. Experimental results with simulated uniform and non-uniform illumination demonstrate the effectiveness of the proposed method in phase retrieval for partially coherent light field.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"16 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126029634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信