Asymmetric <i>Y</i>-junction wavelength demultiplexer based on segmented waveguides

Weissman, Z.; Nir, D.; Ruschin, S.; Hardy, A.

doi:10.1063/1.115425

Cited by 19 publications

(8 citation statements)

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“… 49 ). Similar asymmetric Y-junctions have also been demonstrated in the past for wavelength separation, with the use of different waveguiding materials 50 – 52 or sub-wavelength gratings 53 , 54 . Although most of these asymmetric coupler-based filters can separate wavelengths sufficiently far apart, they have not been able to simultaneously demonstrate an ultra-wideband response and a fast spectral roll-off.…”

Section: Introductionmentioning

confidence: 62%

Transmissive silicon photonic dichroic filters with spectrally selective waveguides

Magden

Raval

et al. 2018

Nat Commun

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Many optical systems require broadband filters with sharp roll-offs for efficiently splitting or combining light across wide spectra. While free space dichroic filters can provide broadband selectivity, on-chip integration of these high-performance filters is crucial for the scalability of photonic applications in multi-octave interferometry, spectroscopy, and wideband wavelength-division multiplexing. Here we present the theory, design, and experimental characterization of integrated, transmissive, 1 × 2 port dichroic filters using spectrally selective waveguides. Mode evolution through adiabatic transitions in the demonstrated filters allows for single cutoff and flat-top responses with low insertion losses and octave-wide simulated bandwidths. Filters with cutoffs around 1550 and 2100 nm are fabricated on a silicon-on-insulator platform with standard complementary metal-oxide-semiconductor processes. A filter roll-off of 2.82 dB nm−1 is achieved while maintaining ultra-broadband operation. This new class of nanophotonic dichroic filters can lead to new paradigms in on-chip communications, sensing, imaging, optical synthesis, and display applications.

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Section: Introductionmentioning

confidence: 62%

Transmissive silicon photonic dichroic filters with spectrally selective waveguides

Magden

Raval

et al. 2018

Nat Commun

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“…In the experimental studies of Ref. 4, the transmission through a continuous and periodically segmented waveguide of an asymmetric Y junction was investigated. The transmission through the two waveguides are matched in the Y junction, indicating phase matching as well as matching of propagation constants.…”

Section: Resultsmentioning

confidence: 99%

“…Application of PSWs ranges from nonlinear devices, which use quasiphase-matched second harmonic generation, 1 to linear devices like a 2-D mode taper, 2 asymmetric directional coupler filter, 3 and wavelength demultiplexer. 4 Using this technique, one may achieve a multi-⌬n waveguide pattern in one fabrication step. To fully exploit the characteristics of such waveguides, it is very important to model these waveguides to obtain the propagation characteristics in terms of various parameters, such as the period of segmentation, spatial duty cycle, transverse dimensions, and refractive index profiles of the guiding regions.…”

Section: Introductionmentioning

confidence: 99%

Analytical model for computing propagation constant of <inline-formula><math display="inline" overflow="scroll"><msub><mi>Ti:LiNbO</mi><mrow><mn>3</mn></mrow></msub></math></inline-formula> periodically segmented waveguides by effective-index-based matrix method

2003

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The effective-index-based matrix method (EIMM), which was earlier used to analyze single-mode continuous waveguides, has been also extended to the analysis of periodically segmented waveguides (PSWs) formed by Ti indiffusion in LiNbO 3 . The Ti-concentration profiles and the induced refractive index changes of Ti:LiNbO 3 PSWs have been computed for different waveguide dimensions and fabrication parameters at the design wavelength by using approximate analytical models. The effective index profile of the PSW is obtained by averaging the contributions from different regions along the segments, and EIMM is then applied for computing propagation constants of the PSWs. The cut-off wavelength of PSW has been computed as a function of duty cycle, keeping the period constant. This PSW, when used as one arm of an asymmetric directional coupler (ADC) along with the other arm formed by a continuous waveguide, can be used as a tunable filter.

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“…Different approaches have been established in the literature for integrated dichroic filtering. These include the use of symmetric and asymmetric directional couplers 58 – 60 , asymmetric Y-junctions 61 – 63 , sub-wavelength gratings 64 , 65 and photonic crystals 66 , MMIs 67 , 68 , Mach–Zehnder interferometers 69 and optical lattice filters 70 , and inverse designed structures 71 on popular photonics platforms. Of these, the directional coupler-based approach is well suited for broadband applications such as ours here, having shown a combination of good extinction ratios, high bandwidths, low loss, and transmissive operation.…”

Section: Discussionmentioning

confidence: 99%

Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs

Rao

Moille

et al. 2021

Light Sci Appl

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Microcombs—optical frequency combs generated in microresonators—have advanced tremendously in the past decade, and are advantageous for applications in frequency metrology, navigation, spectroscopy, telecommunications, and microwave photonics. Crucially, microcombs promise fully integrated miniaturized optical systems with unprecedented reductions in cost, size, weight, and power. However, the use of bulk free-space and fiber-optic components to process microcombs has restricted form factors to the table-top. Taking microcomb-based optical frequency synthesis around 1550 nm as our target application, here, we address this challenge by proposing an integrated photonics interposer architecture to replace discrete components by collecting, routing, and interfacing octave-wide microcomb-based optical signals between photonic chiplets and heterogeneously integrated devices. Experimentally, we confirm the requisite performance of the individual passive elements of the proposed interposer—octave-wide dichroics, multimode interferometers, and tunable ring filters, and implement the octave-spanning spectral filtering of a microcomb, central to the interposer, using silicon nitride photonics. Moreover, we show that the thick silicon nitride needed for bright dissipative Kerr soliton generation can be integrated with the comparatively thin silicon nitride interposer layer through octave-bandwidth adiabatic evanescent coupling, indicating a path towards future system-level consolidation. Finally, we numerically confirm the feasibility of operating the proposed interposer synthesizer as a fully assembled system. Our interposer architecture addresses the immediate need for on-chip microcomb processing to successfully miniaturize microcomb systems and can be readily adapted to other metrology-grade applications based on optical atomic clocks and high-precision navigation and spectroscopy.

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Asymmetric Y-junction wavelength demultiplexer based on segmented waveguides

Cited by 19 publications

References 0 publications

Transmissive silicon photonic dichroic filters with spectrally selective waveguides

Transmissive silicon photonic dichroic filters with spectrally selective waveguides

Analytical model for computing propagation constant of <inline-formula><math display="inline" overflow="scroll"><msub><mi>Ti:LiNbO</mi><mrow><mn>3</mn></mrow></msub></math></inline-formula> periodically segmented waveguides by effective-index-based matrix method

Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs

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