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An inversely designed integrated spectrometer with reconfigurable performance and ultra-low power consumption
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作者 Ang Li Yifan Wu +3 位作者 Chang Wang Feixia Bao Zongyin Yang Shilong Pan 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2024年第8期43-54,共12页
Despite the pressing demand for integrated spectrometers,a solution that deliver high-performance while being practically operated is still missing.Furthermore,current integrated spectrometers lack reconfigurability i... Despite the pressing demand for integrated spectrometers,a solution that deliver high-performance while being practically operated is still missing.Furthermore,current integrated spectrometers lack reconfigurability in their performance,which is highly desirable for dynamic working scenarios.This study presents a viable solution by demonstrating a userfriendly,reconfigurable spectrometer on silicon.At the core of this innovative spectrometer is a programmable photonic circuit capable of exhibiting diverse spectral responses,which can be significantly adjusted using on-chip phase shifters.The distinguishing feature of our spectrometer lies in its inverse design approach,facilitating effortless control and efficient manipulation of the programmable circuit.By eliminating the need for intricate configuration,our design reduces power consumption and mitigates control complexity.Additionally,our reconfigurable spectrometer offers two distinct operating conditions.In the Ultra-High-Performance mode,it is activated by multiple phase-shifters and achieves exceptional spectral resolution in the picometer scale while maintaining broad bandwidth.On the other hand,the Ease-of-Use mode further simplifies the control logic and reduces power consumption by actuating a single-phase shifter.Although this mode provides a slightly degraded spectral resolution of approximately 0.3 nm,it prioritizes ease of use and is wellsuited for applications where ultra-fine spectral reconstruction is not a primary requirement. 展开更多
关键词 silicon photonics integrated spectrometers computational spectrometers
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High-power InAlAs/InGaAs Schottky barrier photodiodes for analog microwave signal transmission 被引量:1
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作者 K.S.Zhuravlev A.L.Chizh +6 位作者 K.B.Mikitchuk A.M.Gilinsky I.B.Chistokhin N.A.Valisheva D.V.Dmitriev A.I.Toropov M.S.Aksenov 《Journal of Semiconductors》 EI CAS CSCD 2022年第1期44-48,共5页
The design,manufacturing and DC and microwave characterization of high-power Schottky barrier In Al As/In Ga As back-illuminated mesa structure photodiodes are presented.The photodiodes with 10 and 15μm mesa diameter... The design,manufacturing and DC and microwave characterization of high-power Schottky barrier In Al As/In Ga As back-illuminated mesa structure photodiodes are presented.The photodiodes with 10 and 15μm mesa diameters operate at≥40 and 28 GHz,respectively,have the output RF power as high as 58 m W at a frequency of 20 GHz,the DC responsivity of up to 1.08 A/W depending on the absorbing layer thickness,and a photodiode dark current as low as 0.04 n A.We show that these photodiodes provide an advantage in the amplitude-to-phase conversion factor which makes them suitable for use in highspeed analog transmission lines with stringent requirements for phase noise. 展开更多
关键词 InAlAs/InGaAs heterostructures microwave photodiodes microwave photonics
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Time-resolution enhanced multi-path OTD measurement using an adaptive filter based incoherent OFDR
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作者 王立晗 任凌云 +1 位作者 王祥传 潘时龙 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第1期153-158,共6页
High accuracy and time resolution optical transfer delay(OTD)measurement is highly desired in many multi-path applications,such as optical true-time-delay-based array systems and distributed optical sensors.However,th... High accuracy and time resolution optical transfer delay(OTD)measurement is highly desired in many multi-path applications,such as optical true-time-delay-based array systems and distributed optical sensors.However,the time resolution is usually limited by the frequency range of the probe signal in frequency-multiplexed OTD measurement techniques.Here,we proposed a time-resolution enhanced OTD measurement method based on incoherent optical frequency domain reflectometry(I-OFDR),where an adaptive filter is designed to suppress the spectral leakage from other paths to break the resolution limitation.A weighted least square(WLS)cost function is first established,and then an iteration approach is used to minimize the cost function.Finally,the appropriate filter parameter is obtained according to the convergence results.In a proof-of-concept experiment,the time-domain response of two optical links with a length difference of 900 ps is successfully estimated by applying a probe signal with a bandwidth of 400 MHz.The time resolution is improved by 2.78times compared to the theoretical resolution limit of the inverse discrete Fourier transform(iDFT)algorithm.In addition,the OTD measurement error is below±0.8 ps.The proposed algorithm provides a novel way to improve the measurement resolution without applying a probe signal with a large bandwidth,avoiding measurement errors induced by the dispersion effect. 展开更多
关键词 optical transfer delay measurement time resolution enhancement incoherent OFDR adaptive filtering
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Optical pulse repetition rate division using an optoelectronic oscillator
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作者 李平 邵琨麟 +1 位作者 张亚梅 潘时龙 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第4期125-129,共5页
An approach for frequency division of an optical pulse train(OPT) based on an optoelectronic oscillator(OEO) is proposed and experimentally demonstrated. When the OPT is injected into the OEO, a microwave signal with ... An approach for frequency division of an optical pulse train(OPT) based on an optoelectronic oscillator(OEO) is proposed and experimentally demonstrated. When the OPT is injected into the OEO, a microwave signal with a frequency equaling fractional multiples of the repetition rate of the OPT is generated. This signal is then fed back to the OEO, maintaining its oscillation, while simultaneously serving as the control signal of a Mach–Zehnder modulator(MZM) in the OEO. The MZM acts as an optical switch, permitting specific pulses to pass through while blocking others. As a result, the repetition rate of the OPT is manipulated. A proof-of-concept experiment is carried out. Frequency division factors of 2 and 3 are successfully achieved. The phase noises of the OPT before and after the frequency division are investigated. Compared to previously reported systems, no external microwave source and sophisticated synchronization structure are needed. 展开更多
关键词 frequency division optoelectronic oscillator mode-locked laser microwave photonics
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