Programmable eye-opener lattice filter for multi-channel dispersion compensation using an integrated compact low-loss silicon nitride platform

Moreira, Renan; Gundavarapu, Sarat; Blumenthal, D.J.

doi:10.1364/oe.24.016732

Cited by 16 publications

(9 citation statements)

References 12 publications

(13 reference statements)

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“…The foundry-compatible platform and fabrication of this laser make it possible to create high-performance light sources with reduced size, cost, and power consumption. This compatibility allows this chip-scale laser to be integrated with a wide variety of Si3N4 and silicon photonic waveguide active 33 and passive 34,35 components. Further integration with heterogeneous silicon/III-V tunable lasers 21,36 can leverage the property of pump phase noise and RIN reduction in Brillioun lasers 31 , to further pave the way to low cost, tunable highly coherent Brillouin lasers.…”

Section: Discussionmentioning

confidence: 99%

Sub-hertz fundamental linewidth photonic integrated Brillouin laser

et al. 2018

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Photonic systems and technologies traditionally relegated to table-top experiments are poised to make the leap from the laboratory to real-world applications through integration, leading to a dramatic decrease in size, weight, power, and cost 1 . In particular, photonic integrated ultra-narrow linewidth lasers are a critical component for applications including coherent communications 2 , metrology 3-5 , microwave photonics 6 , spectroscopy 7 , and optical synthesizers 1 . Stimulated Brillouin scattering (SBS) lasers, through their unique linewidth narrowing properties 8 , are an ideal candidate to create highly-coherent waveguide integrated sources. In particular, cascaded-order Brillouin lasers show promise for multi-line emission 14 , low-noise microwave generation 6 and other optical comb applications. To date, compact, very-low linewidth SBS lasers have been demonstrated using discrete, tapered-fiber coupled chip-scale silica 9,10 or CaF2 11 microresonators. Photonic integration of these lasers can dramatically improve their stability to environmental and mechanical disturbances, simplify their packaging, and lower cost through wafer-scale photonics foundry processes. While single-order silicon 12 and cascade-order chalcogenide 13 waveguide SBS lasers have been demonstrated, these lasers produce modest emission linewidths of 10-100 kHz and are not compatible with waferscale photonics foundry processes. Here, we report the first demonstration of a sub-Hz (~0.7 Hz) fundamental linewidth photonic-integrated Brillouin cascaded-order laser, representing a significant advancement in the state-of-the-art in integrated waveguide SBS lasers. This laser is comprised of a bus-ring resonator fabricated using an ultra-low loss (< 0.5 dB/m) Si3N4 waveguide platform. To achieve a sub-Hz linewidth, we leverage a high-Q, large mode volume, single polarization mode resonator that produces photon generated acoustic waves without phonon guiding. This approach greatly relaxes phase matching conditions between polarization modes and optical and acoustic modes. By using a theory for cascaded-order Brillouin laser dynamics 14 , we determine the fundamental emission linewidth of the first Stokes order by measuring the beat-note linewidth between and the relative powers of the first and third Stokes orders. Extension of these high performance lasers to the visible and near-IR wavebands is possible due to the low optical loss of silicon nitride waveguides from 405 nm to 2350 nm 15 , paving the way to photonic-integrated sub-Hz lasers for visible-light applications including atomic clocks and precision spectroscopy.

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Section: Discussionmentioning

confidence: 99%

Sub-hertz fundamental linewidth photonic integrated Brillouin laser

et al. 2018

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“…A Si 3 N 4 programmable optical lattice filter leverages the ability to fabricate many stages of low-loss discrete delays with tunable optical couplers, providing a low-power, low-cost alternative to high-bandwidth digital processing. A programmable tenth-order lattice filter with cascaded asymmetric MZIs (aMZIs) can be designed with an FSR matched to the WDM channel spacing, allowing dispersion compensation for multiple optical channels simultaneously [100], [101]. The lattice filter was realized using 21 cascaded aMZIs to realize a ten-stage programmable tenth-order lattice filter [Fig.…”

Section: Fig 10 (A) Schematic Layout Of a Three-stage Ring Resonator Filter (B) Calculated Normalized Group Delay Response The Bold Line mentioning

confidence: 99%

Silicon Nitride in Silicon Photonics

et al. 2018

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The silicon nitride (Si 3 N 4 ) planar waveguide platform has enabled a broad class of low-loss planar-integrated devices and chip-scale solutions that benefit from transparency over a wide wavelength range (400-2350 nm) and fabrication using wafer-scale processes. As a complimentary platform to silicon-on-insulator (SOI) and III-V photonics, Si 3 N 4 waveguide technology opens up a new generation of systemon-chip applications not achievable with the other platforms alone. The availability of low-loss waveguides (<1 dB/m) that can handle high optical power can be engineered for linear and nonlinear optical functions, and that support a variety of passive and active building blocks opens new avenues for systemon-chip implementations. As signal bandwidth and data rates continue to increase, the optical circuit functions and complexity made possible with Si 3 N 4 has expanded the practical application of optical signal processing functions that can reduce energy consumption, size and cost over today's digital electronic solutions. Researchers have been able to push the performance photonic-integrated components beyond other integrated platforms, including ultrahigh Q resonators, optical filters, highly coherent lasers, optical signal processing circuits, nonlinear optical devices, frequency comb generators, and biophotonic system-on-chip. This review paper covers the Manuscript

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“…These characteristics enable applications previously supported only by fiber-based components to now be realized with a photonic integrated circuit (PIC) at a lower cost point and a smaller packaging footprint. Example applications include tunable optical true time delays for broadband phased array antennas [5][6][7], optical gyroscope rotational velocity sensors [8], and programmable dispersion compensating lattice filters [9].…”

Section: Introductionmentioning

confidence: 99%

Ultra-low-loss Ta_2O_5-core/SiO_2-clad planar waveguides on Si substrates

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Bowers

et al. 2017

Optica

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An increasing number of systems and applications depend on photonics for transmission and signal processing. This includes data centers, communications systems, environmental sensing, radar, lidar, and microwave signal generation. Such systems increasingly rely on monolithic integration of traditionally bulk optical components onto the chip scale to significantly reduce power and cost while simultaneously maintaining the requisite performance specifications at high production volumes. A critical aspect to meeting these challenges is the loss of the waveguide on the integrated optic platform, along with the capability of designing a wide range of passive and active optical elements while providing compatibility with low-cost, highly manufacturable processes, such as those found in CMOS. In this article, we report the demonstration of a record low propagation loss of 3 1 dB∕m across the entire telecommunications C-band for a CMOS-compatible Ta 2 O 5 -core∕SiO 2 -clad planar waveguide. The waveguide design, fabrication process, and optical frequency domain reflectometry characterization of the waveguide propagation loss and group index are described in detail. The losses and dispersion properties of this platform enable the integration of a wide variety of linear and nonlinear optical components on-chip, as well as integration with active rare-earth components for lasers and amplifiers and additionally silicon photonic integrated devices. This opens up new integration possibilities within the data communications, microwave photonics, high bandwidth electrical RF systems, sensing, and optical signal processing applications and research communities.

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Programmable eye-opener lattice filter for multi-channel dispersion compensation using an integrated compact low-loss silicon nitride platform

Cited by 16 publications

References 12 publications

Sub-hertz fundamental linewidth photonic integrated Brillouin laser

Sub-hertz fundamental linewidth photonic integrated Brillouin laser

Silicon Nitride in Silicon Photonics

Ultra-low-loss Ta_2O_5-core/SiO_2-clad planar waveguides on Si substrates

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