The high-speed intrinsic modulation characteristics of a hybrid-modulation laser diode integrated with a passive waveguide was numerically analyzed. It was confirmed that the 3-dB intrinsic small-signal modulation bandwidth depended on the coupling coefficient of the corrugation grating $kappa $ at the distributed feedback (DFB) section and modulation amplitude ration (MAR) at the DFB and intra-cavity loss-modulation sections. The modulation bandwidth became wider when $kappa $ decreased and MAR increased. The maximum 3-dB E/O modulation bandwidth was more than 600 GHz when $kappa $ and MAR were from 40 to 80 cm−1 and 6.4 V. It remained more than 300 GHz when $kappa $ was from 40 to 200 cm−1 and MAR was from 3.2 to 6.4 V. Dynamic single-mode operation of the laser was demonstrated numerically with a 200-Gbit/s non-return-to-zero (NRZ) modulation signal. A clear eye-opened optical NRZ pattern with a minimum extinction ratio at the eye-opening area of more than 1.0 dB was confirmed in a wide operation range and at a higher bit rate up to 300 Gbit/s.
{"title":"Numerical Analysis for High-Speed Hybrid- Modulation Semiconductor Laser Integrated With Passive Waveguide","authors":"Hiroshi Yasaka;Nobuhide Yokota;Takahiko Shindo;Wataru Kobayashi","doi":"10.1109/JQE.2024.3424421","DOIUrl":"10.1109/JQE.2024.3424421","url":null,"abstract":"The high-speed intrinsic modulation characteristics of a hybrid-modulation laser diode integrated with a passive waveguide was numerically analyzed. It was confirmed that the 3-dB intrinsic small-signal modulation bandwidth depended on the coupling coefficient of the corrugation grating \u0000<inline-formula> <tex-math>$kappa $ </tex-math></inline-formula>\u0000 at the distributed feedback (DFB) section and modulation amplitude ration (MAR) at the DFB and intra-cavity loss-modulation sections. The modulation bandwidth became wider when \u0000<inline-formula> <tex-math>$kappa $ </tex-math></inline-formula>\u0000 decreased and MAR increased. The maximum 3-dB E/O modulation bandwidth was more than 600 GHz when \u0000<inline-formula> <tex-math>$kappa $ </tex-math></inline-formula>\u0000 and MAR were from 40 to 80 cm−1 and 6.4 V. It remained more than 300 GHz when \u0000<inline-formula> <tex-math>$kappa $ </tex-math></inline-formula>\u0000 was from 40 to 200 cm−1 and MAR was from 3.2 to 6.4 V. Dynamic single-mode operation of the laser was demonstrated numerically with a 200-Gbit/s non-return-to-zero (NRZ) modulation signal. A clear eye-opened optical NRZ pattern with a minimum extinction ratio at the eye-opening area of more than 1.0 dB was confirmed in a wide operation range and at a higher bit rate up to 300 Gbit/s.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-8"},"PeriodicalIF":2.2,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-08DOI: 10.1109/JQE.2024.3424417
Alexis C. Sparapani;Lucas N. Gutierrez;Santiago M. Hernandez;Pablo I. Fierens;Diego F. Grosz;Govind P. Agrawal
We study the interaction between an intense soliton and a weak control pulse in optical media with a zero-nonlinearity wavelength (ZNW). By means of numerical simulations, we show that the soliton’s wavelength and group delay can be modified by a proper choice of parameters of the control pulse, such as its power, frequency, and initial delay. Most remarkably, we demonstrate either the suppression of the soliton’s Raman-Induced Frequency Shift (RIFS) or the enhancement of this effect and explain it by temporal analogies of reflection and transmission. Finally, we propose an all-optical switching scheme based on time and frequency windows.
{"title":"Raman Suppression and All-Optical Control in Media With a Zero-Nonlinearity Wavelength","authors":"Alexis C. Sparapani;Lucas N. Gutierrez;Santiago M. Hernandez;Pablo I. Fierens;Diego F. Grosz;Govind P. Agrawal","doi":"10.1109/JQE.2024.3424417","DOIUrl":"10.1109/JQE.2024.3424417","url":null,"abstract":"We study the interaction between an intense soliton and a weak control pulse in optical media with a zero-nonlinearity wavelength (ZNW). By means of numerical simulations, we show that the soliton’s wavelength and group delay can be modified by a proper choice of parameters of the control pulse, such as its power, frequency, and initial delay. Most remarkably, we demonstrate either the suppression of the soliton’s Raman-Induced Frequency Shift (RIFS) or the enhancement of this effect and explain it by temporal analogies of reflection and transmission. Finally, we propose an all-optical switching scheme based on time and frequency windows.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-6"},"PeriodicalIF":2.2,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photonic reservoir computing (RC) is a kind of artificial neural network (ANN) structure which is easy to train, with higher accuracy and speed, and has important application prospects in various fields, such as the time-series prediction, waveform recognition, speech recognition, nonlinear channel equalization, etc. In this work, we demonstrated a comprehensive numerical investigation on the characteristics and physical mechanisms of dual-channel and parallel RC based on vertical-cavity surface-emitting laser (VCSEL-RC) with filtered optical feedback (FOF). Using the dual-channel time-series prediction tasks as standard benchmark, the effects of feedback parameters (feedback strength, filter bandwidth, feedback detuning) and type on normalized mean square error (NMSE) were explored in detail. We found that: Selecting a smaller filter bandwidth can widen the range of values of feedback strength corresponding to smaller NMSE, which can effectively strengthen the robustness of parallel VCSEL-RC; When the feedback detuning varies from positive to negative value, the range of parameters space for feedback strength-filter bandwidth corresponding to lower NMSE tends to be narrowed; Compared with parallelly polarized FOF (PP-FOF), orthogonally polarized FOF (OP-POF) shows a stronger robustness enhancement; For smaller feedback strength, NMSE value is insensitive to the interior parameters of VCSEL. We also evaluated the processing rate of parallel VCSEL-RC with FOF. This study is valuable on enriching the understanding for nonlinear dynamics of FOF-based VCSEL-RC, and can provide a design guideline towards parallel, dual-channel RC with robust performance.
{"title":"A Comprehensive Investigation on Enhanced Robustness for Parallel VCSEL-RC Utilizing Narrow-Band Filtered Optical Feedback","authors":"Sha-Sha Deng;Wei-Jie Song;Mei-Ling Zou;Xin-Hong Jia;Yu-Quan Tang;Ming-Yu Bao;Jiang-Tao Lv;Xuan Zhang","doi":"10.1109/JQE.2024.3416990","DOIUrl":"10.1109/JQE.2024.3416990","url":null,"abstract":"Photonic reservoir computing (RC) is a kind of artificial neural network (ANN) structure which is easy to train, with higher accuracy and speed, and has important application prospects in various fields, such as the time-series prediction, waveform recognition, speech recognition, nonlinear channel equalization, etc. In this work, we demonstrated a comprehensive numerical investigation on the characteristics and physical mechanisms of dual-channel and parallel RC based on vertical-cavity surface-emitting laser (VCSEL-RC) with filtered optical feedback (FOF). Using the dual-channel time-series prediction tasks as standard benchmark, the effects of feedback parameters (feedback strength, filter bandwidth, feedback detuning) and type on normalized mean square error (NMSE) were explored in detail. We found that: Selecting a smaller filter bandwidth can widen the range of values of feedback strength corresponding to smaller NMSE, which can effectively strengthen the robustness of parallel VCSEL-RC; When the feedback detuning varies from positive to negative value, the range of parameters space for feedback strength-filter bandwidth corresponding to lower NMSE tends to be narrowed; Compared with parallelly polarized FOF (PP-FOF), orthogonally polarized FOF (OP-POF) shows a stronger robustness enhancement; For smaller feedback strength, NMSE value is insensitive to the interior parameters of VCSEL. We also evaluated the processing rate of parallel VCSEL-RC with FOF. This study is valuable on enriching the understanding for nonlinear dynamics of FOF-based VCSEL-RC, and can provide a design guideline towards parallel, dual-channel RC with robust performance.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-8"},"PeriodicalIF":2.2,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-17DOI: 10.1109/JQE.2024.3415126
Vivek Mehta;Sonali Jana;Utpal Roy
We report a similarity measurement algorithm, based on quantum optics formulation, where a coherent state is used as the elementary quantum resource. The algorithm is demonstrated for an image database and we provide an architecture with constituent optical elements in linear order with respect to the image resolution. The obtained phase-distributed multimode coherent state is fed into an image retrieval scheme and we identify the appropriate laser intensity parameter for similarity measurement. We demonstrate the viability of the protocol through an objective quality assessment of images by adding consecutive layers of noises. The results are in good agreement with the expected outcome. The image distortion-sensitivity analysis of the metric establishes the further merit of the model. Our quantum algorithm has wider applicability also in supervised machine learning tasks.
{"title":"Optical Circuit for Quantum Similarity Measurement Algorithm","authors":"Vivek Mehta;Sonali Jana;Utpal Roy","doi":"10.1109/JQE.2024.3415126","DOIUrl":"10.1109/JQE.2024.3415126","url":null,"abstract":"We report a similarity measurement algorithm, based on quantum optics formulation, where a coherent state is used as the elementary quantum resource. The algorithm is demonstrated for an image database and we provide an architecture with constituent optical elements in linear order with respect to the image resolution. The obtained phase-distributed multimode coherent state is fed into an image retrieval scheme and we identify the appropriate laser intensity parameter for similarity measurement. We demonstrate the viability of the protocol through an objective quality assessment of images by adding consecutive layers of noises. The results are in good agreement with the expected outcome. The image distortion-sensitivity analysis of the metric establishes the further merit of the model. Our quantum algorithm has wider applicability also in supervised machine learning tasks.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 6","pages":"1-8"},"PeriodicalIF":2.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-17DOI: 10.1109/JQE.2024.3415162
Yulan Zhou;Jia Zhao;Xun Li
In this work, we have proposed a multi-beam-interferometer-assistant SOA-PIN (MBIA-SOA-PIN) photodetector aiming at achieving a high sensitivity and a high wavelength drift tolerance by reducing the SOA’s amplified spontaneous emission (ASE) noise through a finite impulse response (FIR)-type filter. Our simulation results show that the MBIA-SOA-PIN photodetector has a wavelength drift tolerance of ±1.92 nm, and a sensitivity of -18.2 dBm at a bit-error-rate (BER) of 10-12 under a data rate of 240 Gbps. Compared with the GA-SOA-PIN photodetector which has the best performance among various types of photodetectors ever reported, the MBIA-SOA-PIN photodetector improves the wavelength drift tolerance and reduces the sensitivity dependence on polarization, at the trade-off of slightly lowering the sensitivity for TE polarized signals.
在这项工作中，我们提出了一种多光束干涉仪辅助 SOA-PIN （MBIA-SOA-PIN）光电探测器，旨在通过有限脉冲响应（FIR）型滤波器降低 SOA 的放大自发辐射（ASE）噪声，从而实现高灵敏度和高波长漂移容差。我们的仿真结果表明，MBIA-SOA-PIN 光电探测器的波长漂移容差为±1.92 nm，在数据速率为 240 Gbps 时，误码率（BER）为 10-12 时的灵敏度为-18.2 dBm。GA-SOA-PIN 光电探测器在各种类型的光电探测器中性能最好，与之相比，MBIA-SOA-PIN 光电探测器提高了波长漂移容限，降低了灵敏度对极化的依赖性，但同时也略微降低了对 TE 极化信号的灵敏度。
{"title":"A High-Speed High-Sensitivity Multi-Beam- Interferometer-Assistant SOA-PIN Photodetector With High Wavelength Drift Tolerance","authors":"Yulan Zhou;Jia Zhao;Xun Li","doi":"10.1109/JQE.2024.3415162","DOIUrl":"https://doi.org/10.1109/JQE.2024.3415162","url":null,"abstract":"In this work, we have proposed a multi-beam-interferometer-assistant SOA-PIN (MBIA-SOA-PIN) photodetector aiming at achieving a high sensitivity and a high wavelength drift tolerance by reducing the SOA’s amplified spontaneous emission (ASE) noise through a finite impulse response (FIR)-type filter. Our simulation results show that the MBIA-SOA-PIN photodetector has a wavelength drift tolerance of ±1.92 nm, and a sensitivity of -18.2 dBm at a bit-error-rate (BER) of 10-12 under a data rate of 240 Gbps. Compared with the GA-SOA-PIN photodetector which has the best performance among various types of photodetectors ever reported, the MBIA-SOA-PIN photodetector improves the wavelength drift tolerance and reduces the sensitivity dependence on polarization, at the trade-off of slightly lowering the sensitivity for TE polarized signals.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-10"},"PeriodicalIF":2.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141453346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-17DOI: 10.1109/JQE.2024.3415148
Avijit Koley;Saurabh Mani Tripathi
We propose and analyse a novel, birefringence free, wavelength filter based on counter-propagating cladding mode assisted integrated-optic Fabry-Pérot (FP) resonator. The FP cavity is formed by suitably designed counter-propagating cladding-mode exciting Bragg gratings in LiNbO3 ridge waveguide. Through rigorous vectorial modeling, we show that appropriate waveguide dimensions and crystal orientation enable birefringence-free operation for both the fundamental core mode as well as the excited cladding mode. We also show that the zero birefringence point of the filter remains unchanged regardless of the applied voltage across the crystal; the reasons behind this behaviour are also explained by the linear electro-optic effect of LiNbO3. Using this we demonstrate a linear electro-optic tuning of the individual Bragg grating spectrum as well as the FP resonances with a typical tuning coefficient of 4 pm/V. Our results may find application in designing high-speed tunable wavelength filters free from input polarization state with linear spectral tuning capabilities.
{"title":"Birefringence Free Spectral Tuning of Bragg Grating Based Fabry-Pérot Resonator in LiNbO₃ Waveguide Employing Counter- Propagating Cladding Modes","authors":"Avijit Koley;Saurabh Mani Tripathi","doi":"10.1109/JQE.2024.3415148","DOIUrl":"https://doi.org/10.1109/JQE.2024.3415148","url":null,"abstract":"We propose and analyse a novel, birefringence free, wavelength filter based on counter-propagating cladding mode assisted integrated-optic Fabry-Pérot (FP) resonator. The FP cavity is formed by suitably designed counter-propagating cladding-mode exciting Bragg gratings in LiNbO3 ridge waveguide. Through rigorous vectorial modeling, we show that appropriate waveguide dimensions and crystal orientation enable birefringence-free operation for both the fundamental core mode as well as the excited cladding mode. We also show that the zero birefringence point of the filter remains unchanged regardless of the applied voltage across the crystal; the reasons behind this behaviour are also explained by the linear electro-optic effect of LiNbO3. Using this we demonstrate a linear electro-optic tuning of the individual Bragg grating spectrum as well as the FP resonances with a typical tuning coefficient of 4 pm/V. Our results may find application in designing high-speed tunable wavelength filters free from input polarization state with linear spectral tuning capabilities.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-8"},"PeriodicalIF":2.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141560978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Femtosecond laser has unique advantages in frequency conversion owing to broadband spectrum and ultra-high peak power. Here, the authors demonstrate the non-central phase matching second harmonic (SH) process by utilizing femtosecond ytterbium-doped fiber (YDF) laser. Numerical solution of the coupled wave equations for the process of femtosecond pulses SH indicates that the non-central phase matching is determined by the spectral broadening and frequency shift. Pumped by Watt-level 1040 nm femtosecond pluses, the period quasi-phase matching at the 1064 nm wavelength, the fundamental frequency (FF) spectrum broadened up to 34.7 nm width and red shifted about 6 nm, and the non-central phase matching SH with PPKTP crystal waveguide generates at around 523 nm. The experimental measurements confirm the theoretical predictions, and offer a deeper understanding of nonlinear optical effects. The non-central phase matching enables flexible frequency conversion with potential applications in ultrafast optics.
{"title":"Non-Central Phase Matching Second Harmonic Generation by Using High Power Femtosecond Ytterbium-Doped Fiber Laser","authors":"Yu Liu;Shuanggen Zhang;Yangbo Bai;Wei Yan;Bochi Guo;Hui Zhou","doi":"10.1109/JQE.2024.3412091","DOIUrl":"https://doi.org/10.1109/JQE.2024.3412091","url":null,"abstract":"Femtosecond laser has unique advantages in frequency conversion owing to broadband spectrum and ultra-high peak power. Here, the authors demonstrate the non-central phase matching second harmonic (SH) process by utilizing femtosecond ytterbium-doped fiber (YDF) laser. Numerical solution of the coupled wave equations for the process of femtosecond pulses SH indicates that the non-central phase matching is determined by the spectral broadening and frequency shift. Pumped by Watt-level 1040 nm femtosecond pluses, the period quasi-phase matching at the 1064 nm wavelength, the fundamental frequency (FF) spectrum broadened up to 34.7 nm width and red shifted about 6 nm, and the non-central phase matching SH with PPKTP crystal waveguide generates at around 523 nm. The experimental measurements confirm the theoretical predictions, and offer a deeper understanding of nonlinear optical effects. The non-central phase matching enables flexible frequency conversion with potential applications in ultrafast optics.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-5"},"PeriodicalIF":2.2,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141560996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Complex coupled distributed feedback (DFB) lasers and sampled grating distributed Bragg reflector (SGDBR) lasers under optical injection locking are investigated to determine lowest noise operation. A noise reduction (frequency and intensity combined) of up to 15 dB was measured utilizing detuned optical injection locking at the relaxation oscillation frequency. Furthermore, 4 dB improvement in frequency noise at 10 kHz offset for higher coupling coefficient DFBs under injection locking was measured. The DFB lasers show more sensitivity to injection locking and have a lower need of injection power while exhibiting better signal to noise ratio compared to an SGDBR.
{"title":"Minimizing Noise in Distributed Reflector Laser Types Under Optical Injection Locking","authors":"Arbnor Berisha;Hendrik Boerma;Ronald Kaiser;Patrick Runge;Martin Schell","doi":"10.1109/JQE.2024.3412088","DOIUrl":"https://doi.org/10.1109/JQE.2024.3412088","url":null,"abstract":"Complex coupled distributed feedback (DFB) lasers and sampled grating distributed Bragg reflector (SGDBR) lasers under optical injection locking are investigated to determine lowest noise operation. A noise reduction (frequency and intensity combined) of up to 15 dB was measured utilizing detuned optical injection locking at the relaxation oscillation frequency. Furthermore, 4 dB improvement in frequency noise at 10 kHz offset for higher coupling coefficient DFBs under injection locking was measured. The DFB lasers show more sensitivity to injection locking and have a lower need of injection power while exhibiting better signal to noise ratio compared to an SGDBR.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-6"},"PeriodicalIF":2.2,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10552750","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141448036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-05DOI: 10.1109/JQE.2024.3410234
Zhang Meng;Naruya Mochizuki;Shiryu Oiwa;Hua Zhao;Peng Wang;Hongpu Li
A band-selectable and bandwidth-enhanced flat-top rejection filter is proposed and demonstrated both theoretically and experimentally, which is realized by using single-mode fiber (SMF)-based helical long-period fiber gratings (HLPGs) precisely operated at dispersion turning points (DTPs) of the same azimuthal order cladding mode but with different radial indices. As an important application of such HLPGs, the orbital angular momentum (OAM) mode converters enabling to have either a flat-top bandwidth of ~116 nm@-16 dB but centered at wavelength of ~1530 nm, or a flat-top bandwidth ~130 nm @-16 dB but centered at wavelength of ~1650 nm, have been successfully demonstrated. This is the first report for the experimental demonstration of such high-performance band-rejection filters with bands fully matching the C-L bands of the fiber communication. The proposed HLPGs may find potential applications to OAM mode converters, OAM tweezers, and OAM sensors.
{"title":"Helical Long-Period Fiber Grating-Based Band- Selectable and Bandwidth-Enhanced Flat-Top Filter and Its Application to Wideband OAM Mode Converter","authors":"Zhang Meng;Naruya Mochizuki;Shiryu Oiwa;Hua Zhao;Peng Wang;Hongpu Li","doi":"10.1109/JQE.2024.3410234","DOIUrl":"https://doi.org/10.1109/JQE.2024.3410234","url":null,"abstract":"A band-selectable and bandwidth-enhanced flat-top rejection filter is proposed and demonstrated both theoretically and experimentally, which is realized by using single-mode fiber (SMF)-based helical long-period fiber gratings (HLPGs) precisely operated at dispersion turning points (DTPs) of the same azimuthal order cladding mode but with different radial indices. As an important application of such HLPGs, the orbital angular momentum (OAM) mode converters enabling to have either a flat-top bandwidth of ~116 nm@-16 dB but centered at wavelength of ~1530 nm, or a flat-top bandwidth ~130 nm @-16 dB but centered at wavelength of ~1650 nm, have been successfully demonstrated. This is the first report for the experimental demonstration of such high-performance band-rejection filters with bands fully matching the C-L bands of the fiber communication. The proposed HLPGs may find potential applications to OAM mode converters, OAM tweezers, and OAM sensors.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"60 4","pages":"1-8"},"PeriodicalIF":2.2,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141448008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-22DOI: 10.1109/jqe.2024.3404009
B.S. Vikram, M. Gagino, A. Millan-Mejia, L. Augustin, K.A. Williams, V. Dolores Calzadilla
{"title":"Demonstration of inherently low differential phase noise across C-band in InP integrated, amplifying optical phased arrays","authors":"B.S. Vikram, M. Gagino, A. Millan-Mejia, L. Augustin, K.A. Williams, V. Dolores Calzadilla","doi":"10.1109/jqe.2024.3404009","DOIUrl":"https://doi.org/10.1109/jqe.2024.3404009","url":null,"abstract":"","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"3 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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