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公开(公告)号：US12130536B2
公开(公告)日：2024-10-29
申请号：US17599491
申请日：2019-08-15
CPC分类号： G02F1/212 , G02F1/2255
摘要： To provide an optical modulator in which a plurality of Mach-Zehnder type optical waveguides are integrated, which can be driven at a low voltage, and in which the occurrence of a crosstalk phenomenon is suppressed. Provided is an optical modulator including a substrate 1 having an electro-optic effect, and an optical waveguide 10 and a control electrode that are formed on the substrate, in which the optical waveguide has a structure in which a plurality of Mach-Zehnder type optical waveguides are disposed in parallel, the control electrode has a GSSG type differential electrode structure in which two signal electrodes S are disposed between two ground electrodes G for one of the Mach-Zehnder type optical waveguides, and a crosstalk suppressing unit that suppresses signal crosstalk is provided in the ground electrode sandwiched between adjacent Mach-Zehnder type optical waveguides, so that optical modulator can be driven at a low voltage, and in which the occurrence of a crosstalk phenomenon is suppressed.
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公开(公告)号：US20240337536A1
公开(公告)日：2024-10-10
申请号：US18413015
申请日：2024-01-15
发明人： Liangjun LU , Tianyu CHENG , Linjie ZHOU , Jianping CHEN , Jiao LIU
CPC分类号： G01J3/45 , G02F1/212 , G02F1/2252 , G01J2003/4538
摘要： An on-chip Fourier transform spectrometer based on a double-layer spiral waveguide comprises, in order, a waveguide input coupler, a 1×N optical splitter, N double-layer waveguide Y-branch structures, N double-layer spiral waveguides with incremental lengths, N double-layer waveguide Y-branch structures arranged in opposite directions, and N germanium-silicon detectors. The group index difference between the odd mode and the even mode in the double-layer waveguide makes the double-layer spiral waveguide function like an asymmetric Mach-Zehnder interferometer. N double-layer spiral waveguides with incremental lengths are used to achieve a spatial heterodyne based Fourier transform spectrometer. Spectral reconstruction from the measured interference fringes can be achieved by a regression algorithm. The invention meets the application need for miniaturization and portability of Fourier transform spectrometers, and has lower temperature sensitivity compared with the existing on-chip spectrometers on the silicon platform.
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公开(公告)号：US20240329488A1
公开(公告)日：2024-10-03
申请号：US18128528
申请日：2023-03-30
CPC分类号： G02F1/212 , G02F1/0147 , G02F1/225 , G02F2201/58 , G02F2203/15
摘要： An apparatus is provided, in which a feedback loop for tuning a tunable laser includes a Mach-Zehnder interferometer (MZI), a photodetector optically coupled to an optical output of the MZI, and an electrical feedback control circuit connected to receive electrical output signals from the photodetector and configured to frequency-adjust the tunable laser based on the received electrical output signals. One arm of the MZI includes an optical resonator to provide a frequency reference for tuning.
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公开(公告)号：US20240329437A1
公开(公告)日：2024-10-03
申请号：US18409030
申请日：2024-01-10
申请人： TDK CORPORATION
发明人： Hiroki HARA , Yasuhiro TAKAGI , Atsushi SHIMURA , Jiro YOSHINARI
CPC分类号： G02F1/035 , G02B27/0172 , G02F1/0316 , G02F1/212 , G02F1/225 , G02B2027/0178
摘要： An optical modulator is a Mach-Zehnder-type optical modulator having a substrate and an optical waveguide layer including a lithium niobate film formed on the substrate. The optical waveguide layer includes a plurality of flat portions and n ridge portions arranged between the flat portions to be adjacent, where n is two or more. Each of the n ridge portions includes a main waveguide to which visible light is input, a first multimode interference waveguide through which the main waveguide is branched into a first and a second optical branch waveguide, and a second multimode interference waveguide through which the first and the second optical branch waveguide are coupled to form a coupling waveguide. Visible light beams having different wavelengths are input to the n ridge portions. The first multimode interference waveguide and the second multimode interference waveguide have shorter lengths when input light having a longer wavelength is transmitted.
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公开(公告)号：US12092910B2
公开(公告)日：2024-09-17
申请号：US17593924
申请日：2019-08-14
CPC分类号： G02F1/035 , G02F1/212 , G02F1/225 , G02B2006/12142 , G02F2202/20
摘要： In order to provide an optical modulator capable of preventing damage to the substrate and preventing deterioration of the properties of the modulator by reducing the stress on the substrate generated by the modulation electrode, there is provided an optical modulator 1, including: a substrate 5 having an electro-optic effect; an optical waveguide 10 formed on the substrate 5; and a modulation electrode (signal electrode S and ground electrode G) provided on the substrate 5 and modulating a light wave propagating in the optical waveguide 10, wherein a resin 8 to reduce the stress on the substrate 5 generated by the modulation electrode is arranged between a part of the bottom surface of the modulation electrode and the substrate 5 facing a part of the bottom surface of the modulation electrode.
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公开(公告)号：US12085831B2
公开(公告)日：2024-09-10
申请号：US17753241
申请日：2020-08-25
CPC分类号： G02F1/2257 , G02F1/212
摘要： An electro-optical modulator. The electro-optical modulator comprising: an input waveguide, configured to guide light into a modulation region of the electro-optical modulator; a plurality of sub-modulators, within the modulation region, each sub-modulator having a transfer function between an applied voltage and an optical phase shift; and an output waveguide, configured to guide light out of the modulation region. The combination of the transfer functions of each sub-modulator is such that a total transfer function between an applied voltage and an optical phase shift of the modulation region is substantially linear over a range of operating voltages.
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公开(公告)号：US20240296320A1
公开(公告)日：2024-09-05
申请号：US18178094
申请日：2023-03-03
发明人： Yiwei Peng , Yuan Yuan , Stanley Cheung , Wayne Victor Sorin , Marco Fiorentino
摘要： An example microring resonator (MRR) based optical device having improved linearity is presented. The optical device includes a first MRR and a first bus waveguide optically coupled to the first MRR. Further, the optical device includes a second MRR optically coupled to the first MRR, and a second bus waveguide optically coupled to the second MRR. The first MRR and the second MRR are formed between the first bus waveguide and the second bus waveguide. The optical coupling between the first MRR and the second MRR increases the linearity in the optical output of the optical device.
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公开(公告)号：US12072600B2
公开(公告)日：2024-08-27
申请号：US17852173
申请日：2022-06-28
发明人： Hyun Soo Kim , Duk Jun Kim , Dong-Young Kim , Ho Sung Kim , Yongsoon Baek , Jang Uk Shin , Young-Tak Han , Won Seok Han
摘要： Disclosed are a Mach-Zehnder interferometric optical modulator and a method for manufacturing the same. The modulator includes first and second lower clad layers, a core layer, an upper clad layer, a waveguide, and electrodes. The waveguide may include an input waveguide, a waveguide divider, branch waveguides, and a waveguide combiner. Each of the branch waveguides includes first and second connection regions connected to the waveguide combiner and the waveguide divider, respectively, and a phase shift region having a cross-section of a reverse mesa structure that has an upper width that is the same as widths of the first and second connection regions and a lower width that is smaller than the widths of the first and second connection regions.
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公开(公告)号：US20240280846A1
公开(公告)日：2024-08-22
申请号：US18652711
申请日：2024-05-01
发明人： Prashanta Kharel , Mian Zhang , Christian Reimer
CPC分类号： G02F1/0356 , G02B6/125 , G02F1/2255 , G02B2006/12142 , G02F2201/127 , G02F2202/20
摘要： A velocity mismatch between optical signals and microwave electrical signals in electro-optic devices, such as modulators, may be compensated by utilizing different lengths of bends in the optical waveguides as compared to the microwave electrodes to match the velocity of the microwave signal propagating along the coplanar waveguide to the velocity of the optical signal. To ensure the electrode bends do not affect the light in the optical waveguide bends, the electrode may have to be rerouted, e.g. above or below, the optical waveguide layer. To ensure that the pair of optical waveguides have the same optical length, a waveguide crossing may be used to cross the first waveguide through the second waveguide.
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公开(公告)号：US20240272512A1
公开(公告)日：2024-08-15
申请号：US18406795
申请日：2024-01-08
发明人： Nobuaki MITAMURA , Kazumasa SATO
CPC分类号： G02F1/2252 , G02F1/0136 , G02F1/2257 , G02F1/212
摘要： An optical device has an optical modulator element and an optical receiver element. The optical modulator element includes a first optical waveguide extending to a first end face, a first inter-element waveguide extending to a second end face, and an optical modulator including an electro-optic material. The optical receiver element includes a second optical waveguide extending to a third end face, a second inter-element waveguide extending to a fourth end face, an optical receiver, and a polarization element. In the optical device, the first inter-element waveguide and the second inter-element waveguide have been connected to each other by being butted against each other.
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