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公开(公告)号：US10170888B2
公开(公告)日：2019-01-01
申请号：US15343080
申请日：2016-11-03
Applicant: Oracle International Corporation
Inventor： Xuezhe Zheng , Ying Luo , Ashok V. Krishnamoorthy , Kannan Raj
Abstract: The disclosed embodiments provide a laser source comprising a silicon waveguide formed in a silicon layer, and a cascaded array of hybrid distributed feedback (DFB) lasers formed by locating sections of III-V gain material over the silicon waveguide. Each DFB laser in the cascaded array comprises a section of III-V gain material located over the silicon waveguide, wherein the section of III-V gain material includes an active region that generates light, and a Bragg grating located between the III-V gain material and the silicon waveguide. This Bragg grating has a resonance frequency within a gain bandwidth of the section of III-V material and is transparent to frequencies that differ from the resonance frequency. Moreover, each DFB laser has a hybrid mode that resides partially in the III-V gain material and partially in silicon.
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公开(公告)号：US20180143461A1
公开(公告)日：2018-05-24
申请号：US15357358
申请日：2016-11-21
Applicant: Oracle International Corporation
Inventor： Xuezhe Zheng , Ying Luo , Jin Yao , Ashok V. Krishnamoorthy
CPC classification number: G02F1/011 , G02B6/12004 , G02B6/2808 , G02B6/29338 , G02B6/4286 , G02F2203/15 , G02F2203/70 , H01S5/0612 , H01S5/1071 , H01S5/125 , H01S5/3013 , H01S5/50
Abstract: An optical transmitter includes a reflective semiconductor optical amplifier (RSOA) coupled to an input end of a first optical waveguide. An end of the first optical waveguide provides a transmitter output for the optical transmitter. Moreover, a section of the first optical waveguide between the input end and the output end is optically coupled to a ring modulator that modulates an optical signal based on an electrical input signal. A passive ring filter (or a 1×N silicon-photonic switch and a bank of band reflectors) is connected to provide a mirror that reflects light received from the second optical waveguide back toward the RSOA to form a lasing cavity. Moreover, the ring modulator and the passive ring filter have different sizes, which causes a Vernier effect that provides a large wavelength tuning range for the lasing cavity in response to tuning the ring modulator and the passive ring filter.
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公开(公告)号：US20180106964A1
公开(公告)日：2018-04-19
申请号：US15292501
申请日：2016-10-13
Applicant: Oracle International Corporation
Inventor： Ying Luo , Xuezhe Zheng , Ashok V. Krishnamoorthy
CPC classification number: G02B6/12004 , G02B6/12002 , G02B6/132 , G02B6/136 , G02B2006/12104 , G02B2006/12147 , H01S3/0813 , H01S5/021 , H01S5/02252 , H01S5/02469 , H01S5/1035 , H01S5/14
Abstract: The disclosed embodiments provide a system that implements an optical interface. The system includes a semiconductor chip with a silicon layer, which includes a silicon waveguide, and an interface layer (which can be comprised of SiON) disposed over the silicon layer, wherein the interface layer includes an interface waveguide. The system also includes an optical coupler that couples an optical signal from the silicon waveguide in the silicon layer to the interface waveguide in the interface layer, wherein the interface waveguide channels the optical signal in a direction parallel to a top surface of the semiconductor chip. The system additionally includes a mirror, which is oriented to reflect the optical signal from the interface waveguide in a surface-normal direction so that the optical signal exits the top surface of the semiconductor chip.
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公开(公告)号：US20170139237A1
公开(公告)日：2017-05-18
申请号：US15421300
申请日：2017-01-31
Applicant: Oracle International Corporation
Inventor： Ying Luo , Shiyun Lin , Ashok V. Krishnamoorthy , Jock T. Bovington , Xuezhe Zheng
CPC classification number: G02F1/011 , G02F2201/126 , G02F2201/34 , G02F2203/15 , G02F2203/70 , H01S5/021 , H01S5/0261 , H01S5/0265 , H01S5/0287 , H01S5/1032 , H01S5/12 , H01S5/125 , H01S5/142 , H01S5/3013 , H01S5/50
Abstract: A dual-ring-modulated laser includes a gain medium having a reflective end coupled to a gain-medium reflector and an output end coupled to a reflector circuit to form a lasing cavity. This reflector circuit comprises: a first ring modulator; a second ring modulator; and a shared waveguide that optically couples the first and second ring modulators. The first and second ring modulators have resonance peaks, which are tuned to have an alignment separation from each other. During operation, the first and second ring modulators are driven in opposing directions based on the same electrical input signal, so the resonance peaks of the first and second ring modulators shift wavelengths in the opposing directions during modulation. The modulation shift for each of the resonance peaks equals the alignment separation, so the resonance peaks interchange positions during modulation to cancel out reflectivity changes in the lasing cavity caused by the modulation.
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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
Applicant: Oracle International Corporation
Inventor： Ying Luo , Shiyun Lin , Xuezhe Zheng , Ashok V. Krishnamoorthy
CPC classification number: G02F1/025 , G02F1/0123 , G02F1/2255 , G02F2001/0151 , G02F2001/212 , G02F2202/32
Abstract: 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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Patent Agency Ranking
公开(公告)号：US09780528B1
公开(公告)日：2017-10-03
申请号：US15357418
申请日：2016-11-21
Applicant: Oracle International Corporation
Inventor： Xuezhe Zheng , Ying Luo , Daniel Y. Lee , Ashok V. Krishnamoorthy
CPC classification number: 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
Abstract: 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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公开(公告)号：US20170261772A1
公开(公告)日：2017-09-14
申请号：US15609554
申请日：2017-05-31
Applicant: Oracle International Corporation
Inventor： Ying Luo , Shiyun Lin , Xuezhe Zheng , Ashok V. Krishnamoorthy
CPC classification number: G02F1/025 , G02F1/0123 , G02F1/2255 , G02F2001/0151 , G02F2001/212 , G02F2202/32
Abstract: 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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公开(公告)号：US20170104307A1
公开(公告)日：2017-04-13
申请号：US14881741
申请日：2015-10-13
Applicant: Oracle International Corporation
Inventor： Shiyun Lin , Xuezhe Zheng , Ying Luo , Ashok V. Krishnamoorthy
IPC: H01S3/08 , G02B6/122 , G02B6/125 , H01S3/102 , G02B6/12 , G02B6/293 , H01S5/14 , G02B6/10 , G02B6/136
CPC classification number: H01S5/2031 , G02B6/107 , G02B6/12007 , G02B6/1228 , G02B6/125 , G02B6/136 , G02B6/29332 , G02B2006/12104 , H01S5/026 , H01S5/0268 , H01S5/101 , H01S5/1014 , H01S5/1017 , H01S5/1042 , H01S5/12 , H01S5/1209 , H01S5/1212 , H01S5/1215 , H01S5/1231 , H01S5/14 , H01S5/141 , H01S5/223 , H01S5/4068
Abstract: An integrated circuit includes an optical reflector with one or two bus optical waveguides and a one-dimensional, photonic crystal nanobeam cavity to provide single-mode reflection with a narrow bandwidth. In particular, the nanobeam cavity may be implemented on a nanobeam-cavity optical waveguide (such as a channel or ridge optical waveguide), which is optically coupled to the one or two bus optical waveguides. The nanobeam-cavity optical waveguide may include notches along a symmetry axis of the nanobeam-cavity optical waveguide that are partially etched from edges of the nanobeam-cavity optical waveguide toward a center of the nanobeam-cavity optical waveguide. Furthermore, a fill factor of the notches may vary as a function of location along the symmetry axis, while a pitch of the notches is unchanged, to define the nanobeam cavity.
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公开(公告)号：US10162199B2
公开(公告)日：2018-12-25
申请号：US15357358
申请日：2016-11-21
Applicant: Oracle International Corporation
Inventor： Xuezhe Zheng , Ying Luo , Jin Yao , Ashok V. Krishnamoorthy
Abstract: An optical transmitter includes a reflective semiconductor optical amplifier (RSOA) coupled to an input end of a first optical waveguide. An end of the first optical waveguide provides a transmitter output for the optical transmitter. Moreover, a section of the first optical waveguide between the input end and the output end is optically coupled to a ring modulator that modulates an optical signal based on an electrical input signal. A passive ring filter (or a 1×N silicon-photonic switch and a bank of band reflectors) is connected to provide a mirror that reflects light received from the second optical waveguide back toward the RSOA to form a lasing cavity. Moreover, the ring modulator and the passive ring filter have different sizes, which causes a Vernier effect that provides a large wavelength tuning range for the lasing cavity in response to tuning the ring modulator and the passive ring filter.
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公开(公告)号：US20180231808A1
公开(公告)日：2018-08-16
申请号：US15346565
申请日：2016-11-08
Applicant: Oracle International Corporation
Inventor： Xuezhe Zheng , Ying Luo , Ashok V. Krishnamoorthy
CPC classification number: G02F1/025 , G02B6/12007 , G02B6/2938 , G02B6/4215 , G02B2006/12061 , G02B2006/12142 , G02F1/0147 , G02F2203/055 , G02F2203/15 , G02F2203/70 , H04J14/02
Abstract: An optical transmitter includes: a set of reflective silicon optical amplifiers (RSOAs), a set of ring modulators, a shared broadband reflector, a set of intermediate waveguides, and a shared waveguide. Each intermediate waveguide channels light from an RSOA in proximity to an associated ring modulator to cause optically coupled light to circulate in the associated ring modulator. The shared waveguide is coupled to the shared broadband reflector, and passes in proximity to the set of ring modulators, so that light circulating in each ring modulator causes optically coupled light to flow in the shared optical waveguide. During operation, each RSOA forms a lasing cavity with the shared broadband reflector, wherein each lasing cavity has a different wavelength, which is determined by a resonance of the associated ring modulator. The different wavelengths are combined in the shared waveguide to produce a combined output.
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