Integrated Multimode Waveguide With Photonic Lantern for Speckle Spectroscopy

Dan, Yi; Zhang, Yaojing; Wu, Xinru; Tsang, Hon Ki

doi:10.1109/jqe.2020.3037410

Cited by 23 publications

(15 citation statements)

References 36 publications

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“…In this respect, specklebased spectroscopy applications are distinct from all other approaches in that they translate the spectral reconstruction problem into a different domain, namely that of pattern recognition. In recent years, this strategy inspired several applications targeted at the realization of low-cost, alignment-free, on-chip wavemeters and spectrometers [13][14][15]. Random media used for speckle spectroscopy include single [16] or multimode fibers [17], spiral waveguides [18], integrating spheres [19], photonic amorphous structures up to pieces of mother-of-pearl [20].…”

Section: Reconstructive Spectroscopy 21 Speckled Pattern-based Spectr...mentioning

confidence: 99%

Perspectives and recent advances in super-resolution spectroscopy: Stochastic and disordered-based approaches

Boschetti

Pattelli

Torre

et al. 2022

Applied Physics Letters

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Spectroscopic applications are characterized by the constant effort to combine high spectral resolution with large bandwidth. A trade-off typically exists between these two aspects, but the recent development of super-resolved spectroscopy techniques is bringing new opportunities into this field. This is particularly relevant for all applications where compact and cost-effective instruments are needed such as in sensing, quality control, environmental monitoring, or biometric authentication, to name a few. These unconventional approaches exploit several strategies for spectral investigation, taking advantage of concepts such as sparse sampling, artificial intelligence, or post-processing reconstruction algorithms. In this Perspective, we discuss the main strengths and weaknesses of these methods, tracing promising future directions for their further development and widespread adoption.

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Section: Reconstructive Spectroscopy 21 Speckled Pattern-based Spectr...mentioning

confidence: 99%

Perspectives and recent advances in super-resolution spectroscopy: Stochastic and disordered-based approaches

Boschetti

Pattelli

Torre

et al. 2022

Applied Physics Letters

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“…Generally, the bandwidth restriction caused by the number of detectors occurs in the on-chip speckle-based spectrometers [28]. To enlarge the system bandwidth, a scheme with the capability to change the input launch condition is proposed to obtain a broad bandwidth [53,54]. A single-mode input switching matrix configuration is used to excite distinct modes in a compact silicon multimode waveguide spectrometer for bandwidth enlargement.…”

Section: System Bandwidthmentioning

confidence: 99%

“…The usable bandwidth range increases from 22 GHz to 250 GHz by adopting this multiple input method [53]. Another integrated speckle-based spectrometer based on multimode waveguide achieves an enlarged bandwidth of 5.8 nm with the spectral resolution of 0.16 nm by controlling the mode of the incident lightwave via photonic lantern [54]. Different launch conditions will generate independent speckles, and an 2 ( 1) N − times bandwidth improvement can be realized with N input waveguides.…”

Section: System Bandwidthmentioning

confidence: 99%

Review on Speckle-Based Spectrum Analyzer

Wan

Fan

2021

Photonic Sens

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Accurate spectral measurement and wavelength determination are fundamental and vital for many fields. A compact spectrum analyzer with high performance is expected to meet the growing requirements, and speckle-based spectrum analyzer is a potential solution. The basic principle is based on using the random medium to establish a speckle-to-wavelength mapping relationship for spectrum reconstruction. This article introduces current speckle-based spectrum analyzers with different schemes and reviews recent advances in this field. Besides, some applications by using speckle-based spectrum analyzers are also introduced. Finally, the existing challenges and the future prospects of using speckle for spectrum recovery are discussed.

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“…Optical spectrometers which rely on the alternative approach of utilizing wavelength‐dependent speckle patterns have attracted increasing research interest. [ 10–24 ] The speckle patterns created by the light scattering in the integrating sphere [ 12,13 ] and Rayleigh backscattering in the single mode fiber [ 14,15 ] have been demonstrated to offer sub‐femtometer spectral resolution with wide optical bandwidth. The intermodal interference in the multimode fiber provides another lossless approach of speckle spectrometer.…”

Section: Introductionmentioning

confidence: 99%

“…The speckle spectrometers by using multimode waveguide offer the potential for higher spectral resolution with lower loss. [ 23,24 ] However, the increasing bending loss of the multimode waveguides hinders the usage of sharper bends and further miniaturization of the spectrometer for large‐scale integration.…”

Section: Introductionmentioning

confidence: 99%

Compact High Resolution Speckle Spectrometer by Using Linear Coherent Integrated Network on Silicon Nitride Platform at 776 nm

Zhang

Wang

et al. 2021

Laser & Photonics Reviews

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Motivated by applications in mobile optical sensing, ultracompact high‐resolution integrated spectrometers have attracted much interest. Here, a high‐resolution integrated speckle spectrometer, comprising a linear coherent network formed by mutually coupled Mach–Zehnder interferometers and nonidentical microring resonators, is proposed and demonstrated. Deep‐etched grating lines used as mirrors on the edges of the coherent network increase the effective optical path lengths. The speckle spectrometer is realized on a silicon nitride platform, operating at 776 nm central wavelength. The eight‐in−eight‐out linear coherent network provides 64 physical channels. Fine spectral lines separated by 20 pm are experimentally resolved within a device footprint of 520 µm × 220 µm. Compressive sensing is achieved for sparse spectra over a wide optical bandwidth. Up to 600 distinctive wavelength channels can be reconstructed from the 64 physical channels, giving 12 nm operating bandwidth. Both sparse spectra and continuous spectra are well reconstructed experimentally. The integrated speckle spectrometer has great potential for use in future biosensing and bioimaging applications where high spectral resolution is desired.

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Integrated Multimode Waveguide With Photonic Lantern for Speckle Spectroscopy

Cited by 23 publications

References 36 publications

Perspectives and recent advances in super-resolution spectroscopy: Stochastic and disordered-based approaches

Perspectives and recent advances in super-resolution spectroscopy: Stochastic and disordered-based approaches

Review on Speckle-Based Spectrum Analyzer

Compact High Resolution Speckle Spectrometer by Using Linear Coherent Integrated Network on Silicon Nitride Platform at 776 nm

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