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公开(公告)号：US10222552B2
公开(公告)日：2019-03-05
申请号：US14993340
申请日：2016-01-12
摘要： An integrated circuit is described. This integrated circuit includes an optical waveguide defined in a semiconductor layer, and a dielectric optical waveguide disposed on the semiconductor layer and that overlaps a region of the optical waveguide. Moreover, the dielectric optical waveguide includes an optical device (such as a mirror) on a facet separating a first portion of the dielectric optical waveguide and a second portion of the dielectric optical waveguide. The facet may be at an angle relative to a plane of the dielectric optical waveguide and may include a metal layer. During operation, an optical signal conveyed by the optical waveguide is evanescent coupled to the dielectric optical waveguide. Then, the optical signal may be reflected by the optical device. For example, the angle of the facet may be 45°, so that the optical signal is reflected normal to the plane of the dielectric optical waveguide.
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公开(公告)号：US20180270551A1
公开(公告)日：2018-09-20
申请号：US15460083
申请日：2017-03-15
CPC分类号： H04Q11/0062 , H04Q11/0066 , H04Q2011/0086 , H04Q2011/009
摘要： The disclosed embodiments provide an optically switched network system. This system includes a passive optical switch with N inputs and N outputs, which can communicate different wavelengths from each of the N inputs to each of the N outputs. It also includes N end-nodes, and N pairs of optical fibers, wherein each pair connects one of the N end-nodes to one of the N inputs and one of the N outputs. The optically switched network is organized into a virtual data plane and a virtual control plane, which both communicate through the same underlying physical network. The virtual data plane provides any-to-all parallel connectivity for data transmissions among the N end-nodes. The virtual control plane is organized as a ring that serially connects the N end-nodes, wherein the ring communicates arbitration information among distributed-arbitration logic at each of the N end-nodes.
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公开(公告)号：US09983420B2
公开(公告)日：2018-05-29
申请号：US14516301
申请日：2014-10-16
发明人： Philip Amberg , Eric Y. Chang , Xuezhe Zheng , Frankie Y. Liu , Ronald Ho , Ashok V. Krishnamoorthy
CPC分类号： G02F1/025 , G02F1/0147 , G02F2201/58 , G02F2203/15
摘要： In the optical device, a ring-resonator modulator, having an adjustable resonance (center) wavelength, optically couples an optical signal that includes the carrier wavelength from an input optical waveguide to an output optical waveguide. A monitoring mechanism in the optical device, which is optically coupled to the output optical waveguide, monitors a performance metric of an output optical signal from the output waveguide. For example, the monitoring mechanism may monitor: an average optical power associated with the output optical signal, and/or an amplitude of the output optical signal. Moreover, control logic in the optical device adjusts the resonance wavelength based on the monitored performance metric so that the performance metric is optimized.
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公开(公告)号：US09946025B2
公开(公告)日：2018-04-17
申请号：US15216159
申请日：2016-07-21
CPC分类号： G02B6/2852 , G02B6/122 , G02B6/1221 , G02B6/1228 , G02B6/29338 , G02B6/29395 , G02B6/34 , G02B2006/12061
摘要： An integrated circuit includes optical waveguides defined in a semiconductor layer, and uses removable optical taps to allow for in-process characterization and trimming. These optical waveguides may be trimmed during fabrication of the integrated circuit to improve performance. Note that the trimming may modify indexes of refraction of portions of the optical waveguides or may involve a more invasive process. Moreover, the trimming may exclude or may not involve the use of a polymer and/or the carrier wavelengths at a given temperature may be stable as a function of time. The trimming process may use removable optical taps for external feedback to determine the amount of change required. These optical taps may be formed either in the semiconductor layer or the cladding layer, and they may be disabled with negligible impact to device performance via alterations to the cladding layer after the completion of trimming.
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公开(公告)号：US09933574B1
公开(公告)日：2018-04-03
申请号：US15388200
申请日：2016-12-22
CPC分类号： G02B6/30 , G02B6/4214 , G02B6/4224 , G02B6/4239
摘要： The disclosed embodiments relate to a system for assembling an optical connector. During the assembly process, the system first fabricates the optical connector, wherein the optical connector is precut and includes a fiber coupler for connecting to an external optical fiber. Next, the system bonds the optical connector to a photonic chip, wherein the photonic chip includes an optical coupler, which is coupled to one or more optical components within the photonic chip. Finally, after the optical connector is bonded to the photonic chip, the system uses a laser to write a coupling waveguide in the optical connector, wherein the coupling waveguide is routed through the optical connector to connect the optical coupler in the photonic chip with the fiber coupler for connecting to the external optical fiber.
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公开(公告)号：US09880405B2
公开(公告)日：2018-01-30
申请号：US15609554
申请日：2017-05-31
发明人： Ying Luo , Shiyun Lin , Xuezhe Zheng , Ashok V. Krishnamoorthy
CPC分类号： G02F1/025 , G02F1/0123 , G02F1/2255 , G02F2001/0151 , G02F2001/212 , G02F2202/32
摘要： An optical modulator is described. This optical modulator may be implemented using silicon-on-insulator (SOI) technology. In particular, a semiconductor layer in an SOI platform may include a photonic crystal having a group velocity of light that is less than that of the semiconductor layer. Moreover, an optical modulator (such as a Mach-Zehnder interferometer) may be implemented in the photonic crystal with a vertical junction in the semiconductor layer. During operation of the optical modulator, an input optical signal may be split into two different optical signals that feed two optical waveguides, and then subsequently combined into an output optical signal. Furthermore, during operation, time-varying bias voltages may be applied across the vertical junction in the optical modulator using contacts defined along a lateral direction of the optical modulator.
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7.发明授权公开(公告)号：US09871346B1
公开(公告)日：2018-01-16
申请号：US15425889
申请日：2017-02-06
IPC分类号： H01S5/00 , H01S5/065 , H01S5/30 , H01S5/125 , H01S5/026 , H01S5/10 , H01S5/14 , H01S3/105 , H01S5/068 , H01S5/02 , H01S5/024 , H01S5/0687
CPC分类号： H01S5/0687 , H01S3/105 , H01S5/005 , H01S5/021 , H01S5/02252 , H01S5/02453 , H01S5/0612 , H01S5/0654 , H01S5/06817 , H01S5/101 , H01S5/1025 , H01S5/1085 , H01S5/1092 , H01S5/142
摘要： The disclosed embodiments relate to a system that implements a hybrid laser. This system includes a reflective gain medium (RGM) comprising an optical gain material coupled to a mirror. This RGM is coupled to a spot-size converter (SSC), which optically couples the RGM to an optical reflector through a silicon waveguide. The SSC converts an optical mode-field size of the RGM to an optical mode-field size of the silicon waveguide. During operation, the RGM, the spot-size converter, the silicon waveguide and the silicon mirror collectively form a lasing cavity, wherein an effective thermo-optic coefficient (TOC) of a portion of the lasing cavity that passes through the optical gain material and the SSC material is substantially the same as the TOC of silicon. Finally, a laser output is optically coupled out of the lasing cavity.
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公开(公告)号：US09832552B2
公开(公告)日：2017-11-28
申请号：US15013857
申请日：2016-02-02
IPC分类号： G02F1/035 , G02B6/12 , G02B6/28 , G02B6/42 , G02B6/34 , H04B10/06 , H04Q11/00 , H04J14/06 , H04J14/02
CPC分类号： H04Q11/0005 , H04B10/671 , H04B10/675 , H04J14/0212 , H04J14/06 , H04Q2011/0009 , H04Q2011/0016
摘要： An optical receiver is described. Using silicon-photonic components that support a single polarization, the output of an optical receiver is independent of the polarization of an optical signal. In particular, using a polarization-diversity technique, the two orthogonal polarizations in a single-mode optical fiber are split in two and processed independently. For example, the two optical signals may be provided by a polarization-splitting grating coupler. Subsequently, a redistribution element provides mixtures of the two optical signals. Next, a wavelength channel in the two mixed optical signals is selected using a wavelength-selective filter (for example, using ring-resonator drop filters or an echelle grating) and converted into an electrical signal at an optical detector (such as a photodetector) to achieve polarization-independent operation.
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公开(公告)号：US09819421B1
公开(公告)日：2017-11-14
申请号：US15204372
申请日：2016-07-07
发明人： Jingqiong Xie , Ashok V. Krishnamoorthy , Xuezhe Zheng , Jeffrey W. Denq , Kannan Raj , John E. Cunningham , Hiren D. Thacker
IPC分类号： H04B10/69
CPC分类号： H04B10/693
摘要： An optical receiver includes: an active transimpedance amplifier (TIA) that converts a photocurrent from a photosensor into an active voltage signal; a high-speed amplifier that amplifies the active voltage signal to produce an amplified voltage signal that comprises an output for the optical receiver; and a reference-voltage-generation circuit that generates a reference voltage for the high-speed amplifier. This reference-voltage-generation circuit includes a dummy TIA that is identical to the active TIA, but does not receive a live input signal, and produces a dummy voltage signal. It also includes a low-speed amplifier which includes: an active input that receives the active voltage signal from the active TIA output; a dummy input that receives the dummy voltage signal from the dummy TIA output; and an output that controls directly or indirectly the reference voltage for the high-speed amplifier. In the direct control case, the output of low-speed amplifier includes a feedback connection that feeds back into the dummy input. In the indirect control case, the output of low-speed amplifier adjusts the reference voltage for the high-speed amplifier through dummy TIA internal biasing.
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公开(公告)号：US09780528B1
公开(公告)日：2017-10-03
申请号：US15357418
申请日：2016-11-21
发明人： Xuezhe Zheng , Ying Luo , Daniel Y. Lee , Ashok V. Krishnamoorthy
CPC分类号： H01S5/1092 , H01S3/0823 , H01S3/1061 , H01S5/0078 , H01S5/0085 , H01S5/021 , H01S5/0617 , H01S5/06804 , H01S5/1032 , H01S5/1071 , H01S5/125 , H01S5/142 , H01S5/5045
摘要： A tunable laser includes a semiconductor optical amplifier (SOA) having a reflective end coupled to a shared reflector and an output end, which is coupled to a demultiplexer through an input waveguide. The demultiplexer comprises a set of Mach-Zehnder (MZ) lattice filters, which function as symmetric de-interleaving wavelength splitters, that are cascaded to form a binary tree that connects an input port, which carries multiple wavelength bands, to N wavelength-specific output ports that are coupled to a set of N reflectors. A set of variable optical attenuators (VOAs) is coupled to outputs of the MZ lattice filters in the binary tree, and is controllable to selectively add loss to the outputs, so that only a single favored wavelength band, which is associated with a favored reflector in the set of N reflectors, lases at any given time. An output waveguide is optically coupled to the lasing cavity.
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