Journal Club 2024 | Tanabe Photonic Structure Group

Journal Club

By fiscal year (April-December)

Fiscal Year 2024

Presentation Details:

Quantum fluctuations jitter the pulse trains of dissipative Kerr solitons, andSeveral applications are affected. In this paper, we present an AlGaAs-based microA resonator was used to generate a dark pulse and its quantum decoherence was measured. The quantum decoherence was measured.The dark pulse is superior to the bright soliton in terms of coherence.and clearly showed that (for specific values, the spectral density of jitter is dark pulseis 13 dB lower than the bright soliton generated under the same conditions.) The results of this study are as follows. This study was conducted to investigate the dissipationIt establishes an important performance evaluation of the performance of the car soliton.

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Erbium ion doped lithium ni operating in the telecommunications bandOf Acid (LN)Microcavity lasers have recently received a great deal of attention.However, theThere is still significant room for improvement in conversion efficiency and laser threshold.Here, the purpleExternal line lithography, argon ion etching, chemical-mechanical polishingUsing the processThe LN thin film is based on Erbium-Ytterbium co-doped LN thin film.microdevice with multiple copies of the same character (e.g. CD-ROM)Sukkavity was fabricated. Erbium-ytterbium co-doby pipingThe microdies fabricated under the optical pump in the 980 nm band benefited from an improvement in the gain coefficient of theThe ultra-low threshold (about 1 μW) and high conversion efficiency (1.8 × 10^-3%) laser radiation in theobserved. This study improves the performance of LN thin-film lasersEffective forThis is for reference only.

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In this paper, a bidirectional Raman soliton comb using a unidirectional pump is experimentally demonstrated for the first time in a WGM micro optical resonator. A theoretical model is developed that takes into account the bidirectional nature of the Raman gain, and analytical solutions are found for forward and backward propagating Raman sech² solitons generated in the anomalous dispersion regime, using a pump driven in the normal dispersion regime. The stability of the Raman soliton is also discussed, since it consists of losses and Raman amplification from CW waves (equal in both directions), as well as a balance between dispersion and Kerr effect.

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This paper presents a paper on laser self-injection assoc. in an integrated Si3N4 microcavity with normal dispersion.We have demonstrated platicon microcomb generation using the term This is a conventional distributed enApp in contrast to anomalous dispersion-based DKS microcomb generation, which requires zirconia ringRoach.In the paper, a commercially available DFB laser is coupled to a Si3N4 chip and the laser current is simply adjustedand shows that a variety of platicon states can be generated directly by self-injection synchronization.The laser is locked at a normally unstable detent point, allowing stable platicon generation.will be.Platicon microcomputers have narrower optical spectral widths than DKS microcomputersand shows high energy conversion efficiency, and may be used in the visible wavelength range.This study simplifies platicon microcomb generation by using self-injection synchronization,It paves the way for integration on CMOS-compatible platforms.

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Intense ultrashort pulse trains (femtosecond to picosecond) of stable THz frequencyThe generation of light is necessary for the study and measurement of light-matter interactions and for ultrahigh-speed communications.Solid SolidIn electrically pumped lasers, the primary method of generating short pulses is passive mode-locking.However, passive mode synchronization has not yet been realized in the terahertz range, and in the past two decadesIt has been one of the longstanding goals of the company over the years.

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In this study, we demonstrate a fully on-chip laser system that combines narrow linewidth and optical isolation. By combining self-injection-locked (SIL) and isolation on a single CMOS-compatible chip using a high-Q SiN micro-ring resonator for a low-Q on-chip laser, we fabricated a device that provides strong feedback even at high power. The system provides 14dB passive isolation for integrated DFB lasers while simultaneously reducing frequency noise by 25-35dB and operating with turnkey reliability.

Nat. Commun. 15, 7614 (2024).
Markus Ludwig, Furkan Ayhan, Tobias M. Schmidt, Thibault Wildi, Thibault Voumard, Roman Blum, Zhichao Ye, Fuchuan Lei, François Wildi, Francesco Pepe Mahmoud A. Gaafar, Ewelina Obrzud, Davide Grassani, Olivia Hefti, Sylvain Karlen, Steve Lecomte, François Moreau, Bruno Chazelas, Rico Sottile Victor Torres Company, Victor Brasch, Luis G. Villanueva, François Bouchy, and Tobias Herr

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Accurate frequency calibration is necessary for spectroscopic measurements in space exploration, and optical frequency combs are expected to be used as a frequency reference because of their unique characteristics. However, frequency calibration by combs is difficult in the ultraviolet band because the normal dispersion of material dispersion generally increases as the wavelength gets closer to shorter wavelengths. In this study, we have demonstrated the generation of UV combs extending from an EO comb centered at 193 THz to around 800 THz by efficiently generating the fourth harmonic generation through the design of a periodic structure of lithium niobate (LN). Furthermore, we have demonstrated similar harmonic generation in a microcomb using a SiN microcavity. In addition to the results of this study, further reduction of noise and improvement of spectral consistency will enable us to obtain continuous spectra with no gap between visible and UV light from pump light in the telecommunication wavelength band, and will show the possibility of a new method for realizing UV precision spectroscopy.

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In this paper, we present a real-time video image using the Kerr microcomputer.The proposed image processing system has a processing capacity of 17 terabits per second. The proposed image processor has a processing capacity of 17 terabits per second.It can process approximately 400,000 video signals simultaneously. It is also capable of image edge detection34 different image processing functions can be executed simultaneously, such as image output, edge enhancement, motion blur, etc.The video image processor is built on a foundation of RF photonic filters. The video image processor is built on a foundation of RF photonic filtersThe first is a soliton crystal microcomputer. In this study, a soliton crystal microcomb is used. This comserves as the basis for massively parallel processing by generating 95 wavelengths, each channelIt operates at a speed of 64 gigabaud (pixels/second).Future applications are expected to include robot vision and machine learning.

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In this paper, we present a microwave photonics technique using induced Brillouin scattering (SBS).The proposed filter is a single-laser filter with a sidebar of pump and probe beams. The sidebars of the pump and probe beams separated from a single laser areThe filter is achieved by interfering with theThe QAM signal was transmitted and its effectiveness in suppressing interfering signals was verified. The QAM signal was transmitted, and the effect of suppressing interference signals was confirmed. ThisThe filter operates at a low power of 13 dBm and does not require complex system configuration.The design of photonic filters is expected to have a significant impact on the design of photonic filters in the

Presentation Details:

We constructed an incoherent optical neural network accelerator for spatial systems, using LED light sources and spatial light modulators to implement optical matrix product computation, which is implemented simultaneously with electrical circuits to facilitate multiplexing of neural nets, including the implementation of activation functions. A proof-of-principle test was conducted at an operating speed of 500 kHz, and a high response rate of approximately 921 TP3T was achieved for the MNIST classification problem. The system also has excellent low power consumption and is comparable to commercial GPUs. Future possibilities include higher speed, larger scale, and greater integration.

Presentation Details:

This study demonstrates a new approach to 50 GHz dual-mode microcomb generation using a single-color pump dual-mode microcavity. The method has great potential in achieving miniaturization and integration and is applicable to other material platforms. Both numerical simulations and experimental measurements were performed in this study, and the soliton presence range of the TE00 mode was increased from 1.7 MHz to 740 MHz by exploiting the thermal effects from the TE10 mode. This simplifies the soliton excitation procedure using piezoelectric frequency sweeps and slow temperature control. Furthermore, the dual microcomb of mutually coherent solitons, the primary microcomb, and incoherent solitons, the chaotic microcomb, was verified by both spectral analysis and RF beat note measurements. Furthermore, the method presented in this study may serve as a motivation to study the interaction mechanism of microcavity modes in Kerr microcomb generation.

Presentation Details:

The use of deformed microcavities, such as elliptical microdisks, is a microIt is well known to be a solution for free-space emission in small cavity lasers. HoweverDeforming the resonator while maintaining the Q-value lowers the Q-value and consequently weakens the output.The problem is connected. One approach to solving this problem is to use a deformed microcavity structure.A high-efficiency gain medium may be used to compensate for negative effects on the force strength. In this studyThe Nd:YAG laser crystal material is used as the laser gain medium and has an orbit length radius of 15μm.An elliptical microdisk laser with an eccentricity of 0.15 m has been successfully fabricated. The excitation light is 808 nmBy using a laser, an astonishing free-airThe laser oscillation was realized between the This research is expected to contribute to the development of deformed microcavity laser applications in theIt is a contribution to the

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this laboratoryIn this study, a turnkey external resonance laser using quantum dot lasers grown directly on Si was used.Coherence of self-injection-locked (SIL) lasers capable of instrumental synchronization (ECL)This high-performance quantum dot laser is a scalable, low-cost heteplate laser. This high-performance quantum dot laser is a scalable, low-cost hete

The company will provide a platform for bio-epitaxial integration. In addition, it provides a platform for the integration of quantum dot lasers intoThe male-free property is a Lorentz linewidth of 16 Hz under ECL with an external resonator of low Q value.and improve the frequency noise by an order of magnitude compared to conventional quantum well (QW) lasers.The following is a list of the most common problems.

Presentation Details:

Originally, the generation of solitons using microcavities requires dispersion balanced by nonlinear effects.has been required. In this study, we propose a new method to replace this method: spectral filtering.The generation of solitons by taring was investigated both experimentally and computationally. As a resultThe soliton generated by this method has a larger spectral spacing than the soliton generated by dispersion.The characteristics of the pulse duration are that it is dense and that the energy is not limited by the pulse duration.It is now clear that the This finding is an unprecedented feature of dissipative solitons and frequency comIt is expected to lead to a new method for generating

Presentation Details:

With the development of wireless technology, interference between radar altimeters and 5G networks, etc.Serious radio interference is a concern. Mobile transceivers have different ratios over time.The high delay is a bottleneck in conventional digital signal processing because the signals are mixed at aThe problem is that the system-on-a-chip is not a system on a chip. In this paper, we propose a system-on-chipA photonic processor is proposed. This processor is able to convert signals in the analog domain into a 15-piThe processing speed is much faster than that of electronic circuits, with a low latency of less than 1.5 ms. In addition, the processing time is much faster than that of electronic circuits.The compact FPGA-based electronic peripherals complementing the FPGA-basedThe processor has practical utility as a portable device. Experimentally, theIn the two scenarios of radar altimetry and mobile communications, the transmission error suppression and the transmissionThe results demonstrate the maintenance of the noise vs.

Presentation Details:

In this paper, we propose and demonstrate a symmetric optical crossbar array using silicon micro ring resonators (MRRs) for efficient matrix operations in deep learning utilizing photonic integrated circuits (PICs). In this study, a symmetric optical accelerator was fabricated to overcome the problem of unbalanced insertion loss caused by the asymmetric structure of conventional optical accelerators, and the performance was improved. The proposed 4 × 4 MRR crossbar array achieved an accuracy of 93.31 TP3T in the iris flower classification task and maintained an accuracy of 91.11 TP3T after training the neural network using the error back propagation method. In addition, convolutional operations using the 9×9 MRR crossbar array showed high performance in the handwritten digit recognition task, yielding excellent results.

Presentation Details:

Whispering gallery mode(WGM)microtoroidal resonancevessel is the most sensitive biochemical sensor in existence.1It is one,Single molecules can be detected.The main barriers to getting these devices out of the lab are,Light evanes to these devices via tapered optical fibers.cent bonding. This makes the taper fragile,They suffer from mechanical vibration and require precise positioning.In this study, light is injected into the toroid via free-space coupling,Observing scattered light eliminates the need for optical fibers.Digital Micromirror Devices(DMD)and combinations,Observation of light injection and scattered light by combining a distance objective lens,and imaging. With this approach,Electromagnetic induced permeability with indirect coupling in free space(EIT)and Fano co.The first time we were able to observe the sounding of the By this,This enables improved sensing sensitivity. Large effective coupling area(numerical aperture (in photography)=0.14Diameter in~10μm)By,Accurate positioning is not required. This system andFLOWER (Frequency Locked Whispering Evanescent Resonator)Combination of methods,Sensing performance was verified by conducting temperature sensing experiments.While adjusting input powerFLOWERBy tracking the resonance of theand thermal nonlinear optical effects. This study,WGMmicrotto expand the implementation of Lloyd's resonators to real-world applications.We believe it will be the foundation.

Presentation Details:

In this study, the boson peak is taken into account in silica micro optical resonators.Theoretical Raman-induced self-frequency shift of dissipative cur-solitons in theThe results were studied. As a result, we found thatThe boson peak significantly increases the self-frequency shift of the soliton andthan the shift due to the Lorenz response for a given pulse duration.The results also show that the contribution of theAlso, the Raman shock time reconstructed by this is relatively long palThe results of this study showed that the pulse width is also related to the pulse width in the case of a pulse width of 1.5 ms. In addition, theContinuous waves in the background interfering with the soliton cause the soliton to self-frequency shiftThe results also showed that the number ofThis theoretical and simulation result is based on thePrevious experiments in silica-based cursor soliton microcombsvalues are very consistent with the values of the

Presentation Details:

In this paper,Yb3+/Er3+Amplified spontaneous release of co-added silica microspherescoming out(ASE)Excitation by light sourceTuned lasers were studied.ASEUse of lightAnd in,Microcavity coupling clauses in the process of broadband tuningAvoiding synchronization of cases,Practical applications of tunable lasers with microcavities are facilitated.The first time I saw him, he was a very good friend of mine.Yb3+/Er3+In co-doped silica microspheres, the central wavelength1μm(at sentence-end, falling tone) indicates a confident conclusionASEBecause the light source is insensitive to polarization, about1595nm(at sentence-end, falling tone) indicates a confident conclusionStable single-mode lasers were generated.For all-optical modulation of the laser's mode, the magnetronCopper thin film was coated by sputtering.The heating control of microspheres and linear tuning of the laser mode are,by the copper film incident from the stem of the microsphere.ASEReal by absorption of lightRevealed. The tuning range was190 GHzreached the

Presentation Details:

Super Continuum (SC)The light source is a broadband, coherent white pulsed light source.A single light source covers a wide range of wavelengths for spectral analysis andOCT(lessening the significance or value of the previous word) the likes ofThe new system can be used for the following purposes. Until now, it has not been possible toSCLight source generation generally involves the use of stonesEnglish fiber is used.2400nmCovers wavelengths aboveI couldn't do it.In recent years, nanostructures have allowed graded indices (GRIN)A method to realize fiber has been proposed.Fibers can now be made from materials with large nonlinearities and wide transmission bandwidths.The research was carried out in the following way. In this study, telluriteGRINCreate multimode fiber and，790~2900nm(at sentence-end, falling tone) indicates a confident conclusionSCThe results show that the new method successfully generates theThe result of thisSCLow-energy light sources, andIt paves the way for wavelength extension to the infrared.

Presentation Details:

lithium niobate(LN)is the same asStrong confinement of modes to nanoscale waveguides, andAt the same time, second-order nonlinearities are large, dispersion control is easy, andIt has excellent features such as phase matching using periodic structure.The platform is a platform that is not aOn the other hand, for the demonstration of frequency combs with small walk-off conditionsIt is unexplored. In this paper, we will discuss theLNBroadband using thin-film dispersion controlThe generation of an optical frequency comb at the center wavelength1560nmand780nmThe demonstration will be conducted in the following two cases. In this demonstration, we have demonstrated that each of the wavelength bands has a80nm,12nmbandwidth was achieved.This result paves the way for secondary soliton generation.

Presentation Details:

Random bit generators are used for information security, cryptography, andIt is important in stochastic models and simulations.Currently, random bit generation requires the use ofSpeed and scalability are issues. In this study, we used theBased on a single microring resonator, 100 Tbit/A massively parallel scheme for s-scale ultra-fast random bit generation.Proposal. Modulation instability (MI) in a microring resonatorBy using chaos.com byHundreds of independent random bitstreams without bias simultaneouslyThe system is capable of generating In the proof-of-concept experiment, the2 Tbit/ with only 7 comb lines.The results show that it is possible to generate random bitstreams exceeding 1.5 s.This bit rate is the same as that of theCan be easily improved by increasing the number of com wires usedThe approach of this research is to develop a new method for secure communication and high-performance computation. The approach taken in this study is to develop a new method for secure communication and high-performance computation.Very fast and scalable chip-scale random biThe new system is a new generation of the "C" type.

Presentation Details:

It produces a single self-locked Raman soliton andTuning the relative threshold power between OPO and induced Raman scatteringBy,Different spectral dynamics of the frequency combs were characterized.Wide RF linewidth (320 kHz) via Raman scattering photonssech2It is possible to generate enveloping Raman comUnder certain conditions, theSimultaneously, spontaneous and deterministic generation of a single Raman soliton is achievedThe soliton is a single soliton that has been self-locked. This self-locked single soliton is,Generated without an external locking mechanism, theIt was maintained for more than 2 hours. Also,Bu requiring FSR suitable for SBS generation in microcavities.In contrast to the liruan soliton, theRaman solitons have no such constraints, andThe possibility of generating solitons with various repetition rates.This study was conducted byThe first experiment to produce a single self-locked Raman soliton, the...

Presentation Details:

Demonstrated integrated chip-scale OFD (optical frequency division), veryLow noise
Millimeter wave generation is realized. Planar waveguide base with large mode volumeThe coil resonator of
Phase stability is ensured by using a waveguide-coupled microcavity, and a waveguide-coupled microcavity is used to generateliving solitonma
The frequency division was performed from optical to millimeter-wave frequencies using an ICROCOM. The generatedof the 100 GHz signal that was
As the phase noise, the previously reported SiN-based microwave andMore than two orders of magnitude lower than
The noise level is -114 dBc/Hz at an offset frequency of 10 kHz.The first time the bells were reached.
The integration of millimeter-wave generation is a blurring of communication, radar, and sensing systems.Ixlue and
This device will be used for semiconductor lasers and amplifiers in the future.Instrument, Photo Detectors
The ability to heterogeneously integrate with other types of materials and to use them in a wide range of applications is expected.

Presentation Details:

Kerr soliton generation by silicon nitride (SiN) andThe system integrates a silicon (Si) modulator, dispersion compensator, and receiver.WDM communication over single-mode fiber was demonstrated. 1.68Tbit/The transmission speed of 1.5 s was achieved, and dispersion compensation at 40 km SMF was reduced to 1/1 of that of commercial transceivers.The number of bits per second has been successfully reduced to 6. In the future, 10Tbit/The potential to achieve data rates in excess of 1.5 s is a significant advantage of this technology, and it is expected to be used in the future.It is expected to improve the efficiency of interconnection in data centers, etc.