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    Tunable diode laser absorption spectroscopy with corrected laser ramping nonlinearities
    3.
    发明授权
    Tunable diode laser absorption spectroscopy with corrected laser ramping nonlinearities 有权

    公开(公告)号：US10677726B2

    公开(公告)日：2020-06-09

    申请号：US15846912

    申请日：2017-12-19

    申请人： INTERNATIONAL BUSINESS MACHINES CORPORATION

    发明人： William Green ,  Chu Cheyenne Teng ,  Gerard Wysocki ,  Chi Xiong ,  Eric Zhang

    IPC分类号： G01N21/45 ,  G01J3/45 ,  G01N21/27 ,  G01N21/39

    摘要： A tunable diode laser absorption spectroscopy device includes a tunable diode laser. A laser driver is configured to drive the diode laser and ramp it within a particular frequency range. An analyte gas container, a reference gas container, and a fringe generating device are configured to receive the laser therethrough. An optical detector is configured to detect the laser after it has passed through the analyte gas container and/or the reference gas container, and the in-line fringe generating device. An acquisition card is configured to sample an output of the optical detector. A spectral analyzer is configured to receive output data from the acquisition card, determine a spectrum of the output data, decouple the fringe spectrum from the measured spectrum, calibrate the spectrum based on an expected ideal spectrum of both the fringe and reference gas, and determine a composition of the analyte based on the calibrated spectrum.

    Efficient photonic circuits for liquid-cooled high-density datacenters
    5.
    发明授权
    Efficient photonic circuits for liquid-cooled high-density datacenters 有权

    公开(公告)号：US10895682B1

    公开(公告)日：2021-01-19

    申请号：US16518131

    申请日：2019-07-22

    申请人： International Business Machines Corporation

    发明人： Tymon Barwicz ,  Douglas M. Gill ,  William M. Green ,  Jason S. Orcutt ,  Jessie C. Rosenberg ,  Eugen Schenfeld ,  Chi Xiong

    IPC分类号： G02B6/12 ,  G02B6/30 ,  H05K7/20 ,  H01S5/022

    摘要： Photonic circuits are disclosed having an efficient optical power distribution network. Laser chips (InP) having different wavelengths are flip-chip assembled near the center of a silicon photonic chip. Each InP die has multiple optical lanes, but a given die has only one wavelength. Waveguides formed in the photonic chip are optically connected to the lanes, and fan out to form multiple waveguide sets, where each waveguide set has one of the waveguides from each of the different wavelengths, i.e., one waveguide from each InP die. The waveguide network is optimized to minimize the number of crossings that any given waveguide may have, and no waveguide having a particular wavelength crosses another waveguide of the same wavelength. The unique arrangements of light sources and waveguides allows the use of a smaller number of more intense laser sources, particularly in applications such as performance-optimized datacenters where liquid cooling systems may be leveraged.