Low connector-to-connector loss through silicon photonic chips using ultra-low loss splicing of SMF-28 to high numerical aperture fibers

Yin, Peichuan; Serafini, John; Su, Zhan; Shiue, Ren-Jye; Timurdogan, Erman; Fanto, Michael L.; Preble, Stefan F.

doi:10.1364/oe.27.024188

Cited by 39 publications

(18 citation statements)

References 7 publications

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“…The proposed coupler was designed to mimic the fundamental mode of a fiber, which exhibited an ultra-high numerical aperture (NA) of 0.35 and a mode field diameter (MFD) of ~4 μm. Considering the splicing between the high-NA fiber and a standard single-mode fiber (SMF) that incurs a loss as small as 0.06 dB [32], the proposed multi-stage coupler can be readily applied to a standard SMF via a spliced high-NA fiber. Owing to its simple structure and judiciously chosen structural parameters, the proposed device can be engineered to exhibit minimal imperfections under standard fabrication facilities using a single-step fabrication process.…”

Section: Introductionmentioning

confidence: 99%

Compact and Broadband Edge Coupler Based on Multi-Stage Silicon Nitride Tapers

Bhandari

Lee

et al. 2020

IEEE Photonics J.

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We have proposed and experimentally realized an ultra-compact and broadband silicon nitride edge-coupler that enables high coupling efficiency. The proposed coupler was realized by concatenating short tapers in four stages, whose angles were designed to minimize the footprint while preserving the coupling efficiency. The constituting taper segments were designed by carefully sectioning a long adiabatic taper while adapting to an appropriate taper angle for each segment. The designed coupler exhibited an extremely short footprint of 76 μm. A coupling efficiency of 92% was experimentally attained at 1550 nm wavelength when coupled to a single-mode fiber having a mode field diameter of ~4 μm. Further, an efficiency of over 90% throughout the C and L bands was observed. A 3-dB bandwidth of 965 nm, spanning λ =1015-1980 nm, was achieved in the simulation. Additionally, the fabricated device exhibited an enhanced cleaving tolerance by virtue of its elongated tip, along with relaxed alignment tolerances ranging up to 3.5 μm. The proposed design was also found to comply with the waveguides having widths between 1 μm and 4 μm without affecting the overall footprint and efficiency. This work is anticipated to provide a promising foundation for the development of compact photonic devices.

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Section: Introductionmentioning

confidence: 99%

Compact and Broadband Edge Coupler Based on Multi-Stage Silicon Nitride Tapers

Bhandari

Lee

et al. 2020

IEEE Photonics J.

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“…As an alternative, ultra-high numerical aperture (UHNA) fibers allow to create a true butt-coupled (physical contact) fiber-to-chip connection [23]. This technique permits the use of an index-matching medium to minimize reflections and is more suitable for mutual alignment of an array of fibers in multifiber edge coupling [21].…”

Section: Introductionmentioning

confidence: 99%

Mode-field Matching Down-Tapers on Single-Mode Optical Fibers for Edge Coupling Towards Generic Photonic Integrated Circuit Platforms

Vanmol

Saurav²,

Panapakkam³

et al. 2020

J. Lightwave Technol.

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Connections between standard single-mode fibers and waveguides in photonic integrated circuits tend to have relatively high coupling losses due to a difference in mode size and mode profile between both light guiding media. Edge coupling strategies involving specialty fibers are frequently used to obtain the best performance in terms of coupling efficiency, bandwidth and polarization independence. We propose the fabrication of free-standing down-taper structures on top of cleaved fiber facets by two-photon direct laser writing and show their performance for silicon, silicon nitride and indium phosphide generic chip platforms. We present a comprehensive analysis of the design of such taper structures that show unprecedented flexibility. We demonstrate their fabrication and fully characterize them in terms of output modal fields and coupling efficiencies. Furthermore, we experimentally compare the fabricated down-tapers with commercially available lensed fibers and demonstrate equal or better coupling efficiency for four out of the five investigated photonic integrated circuit platforms, with a measured improvement in coupling efficiency up to 1.43 dB.

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“…The PAM-4 burst mode transmission demonstration requires further improvement in the output power of the comb due to low in-and out-coupling in a packaged Si 3 N 4 . The main reason behind the low cou- pling efficiency (15 %) is an additional 2-dB splicing loss between UHNA and SMF-28 fiber, which can be reduced to < 0.2 dB by using state-of-art splicing instruments 40 .…”

mentioning

confidence: 99%

“…SI) providing more than 60 carriers, having an optical power > -20 dBm (∼ 500 mW electrical power per carrier). The electrical power consumption can be improved down to < 193 mW per carrier (15.5 W total) by reducing the splicing loss between UHNA and SMF fibers 40 , implementing on-chip actuators 41 instead of a bulk temperature controller and using a powerefficient, compact distributed feedback (DFB) laser as CW pump 34,36 . By optimizing the microresonator dispersion design, it is possible to generate 122 comb channels having an optical power > -14 dBm without needing any post-amplification 29 .…”

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confidence: 99%

Ultrafast optical circuit switching for data centers using integrated soliton microcombs

Raja,

Lange,

Karpov

et al. 2020

Preprint

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Networks inside current data centers comprise a hierarchy of power-hungry electronic packet switches interconnected via optical fibers and transceivers. As the scaling of such electrically-switched networks approaches a plateau, a power-efficient solution is to implement a flat network with optical circuit switching (OCS), without electronic switches and a reduced number of transceivers due to direct links among servers. One of the promising ways of implementing OCS is by using tunable lasers and arrayed waveguide grating routers. Such an OCS-network can offer high bandwidth and low network latency, and the possibility of photonic integration results in an energyefficient, compact, and scalable photonic data center network. To support dynamic data center workloads efficiently, it is critical to switch between wavelengths in sub nanoseconds (ns). Here we demonstrate ultrafast photonic circuit switching based on a microcomb. Using a photonic integrated Si3N4 microcomb in conjunction with semiconductor optical amplifiers (SOAs), sub ns (< 500 ps) switching of more than 20 carriers is achieved. Moreover, the 25-Gbps non-return to zero (NRZ) and 50-Gbps four-level pulse amplitude modulation (PAM-4) burst mode transmission systems are shown. Further, on-chip Indium phosphide (InP) based SOAs and arrayed waveguide grating (AWG) are used to show sub-ns switching along with 25-Gbps NRZ burst mode transmission providing a path toward a more scalable and energy-efficient wavelengthswitched network for future data centers.

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Low connector-to-connector loss through silicon photonic chips using ultra-low loss splicing of SMF-28 to high numerical aperture fibers

Cited by 39 publications

References 7 publications

Compact and Broadband Edge Coupler Based on Multi-Stage Silicon Nitride Tapers

Compact and Broadband Edge Coupler Based on Multi-Stage Silicon Nitride Tapers

Mode-field Matching Down-Tapers on Single-Mode Optical Fibers for Edge Coupling Towards Generic Photonic Integrated Circuit Platforms

Ultrafast optical circuit switching for data centers using integrated soliton microcombs

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