公开(公告)号：US11506951B2

公开(公告)日：2022-11-22

申请号：US17091905

申请日：2020-11-06

Applicant: Massachusetts Institute of Technology

Inventor： Rajeev J. Ram ,  Dodd Joseph Gray ,  Amir H. Atabaki ,  Marc De Cea Falco

IPC: G02F1/225 ,  G02F1/21 ,  G02F1/01

Abstract: Optical read-out of a cryogenic device (such as a superconducting logic or detector element) can be performed with a forward-biased optical modulator that is directly coupled to the cryogenic device without any intervening electrical amplifier. Forward-biasing at cryogenic temperatures enables very high modulation efficiency (1,000-10,000 pm/V) of the optical modulator, and allows for optical modulation with millivolt driving signals and microwatt power dissipation in the cryogenic environment. Modulated optical signals can be coupled out of the cryostat via an optical fiber, reducing the thermal load on the cryostat. Using optical fiber instead of electrical wires can increase the communication bandwidth between the cryogenic environment and room-temperature environment to bandwidth densities as high as Tbps/mm2 using wavelength division multiplexing. Sensitive optical signals having higher robustness to noise and crosstalk, because of their immunity to electromagnetic interference, can be carried by the optical fiber.

公开(公告)号：US10732044B2

公开(公告)日：2020-08-04

申请号：US16704444

申请日：2019-12-05

Applicant: Massachusetts Institute of Technology

Inventor： Erika Ye ,  Amir H. Atabaki ,  Ningren Han ,  Rajeev J. Ram ,  William F. Herrington

IPC: G01J3/28 ,  G01J3/453 ,  G01J3/02

Abstract: A non-paraxial Talbot spectrometer includes a transmission grating to receive incident light. The grating period of the transmission grating is comparable to the wavelength of interest so as to allow the Talbot spectrometer to operate outside the paraxial limit. Light transmitted through the transmission grating forms periodic Talbot images. A tilted detector is employed to simultaneously sample the Talbot images at various distances along a direction perpendicular to the grating. Spectral information of the incident light can be calculated by taking Fourier transform of the measured Talbot images or by comparing the measured Talbot images with a library of intensity patterns acquired with light sources having known wavelengths.

公开(公告)号：US20170346283A1

公开(公告)日：2017-11-30

申请号：US15398172

申请日：2017-01-04

Applicant: Massachusetts Institute of Technology

Inventor： Wardah Inam ,  David J. Perreault ,  Rajeev J. Ram ,  Daniel DeWitt Strawser

IPC: H02J1/00 ,  H02J13/00 ,  H02J7/00

CPC classification number: H02J13/0003 ,  H02J1/10 ,  H02J1/14 ,  H02J7/35 ,  Y02E40/72 ,  Y04S10/123

Abstract: The systems and methods described herein are directed towards a microgrid having modular power management units to control and regulate power to maintain a stable energy environment and provide peer-to-peer electricity sharing within the microgrid. The microgrid includes a power source to generate power for the microgrid, a source power management unit coupled to the power source to receive the power, one or more load power management units coupled to the source power management unit to receive a portion of the power and a bi-directional communication system to couple the source power management unit to the one or more load power management units to control and allocate the power from the source power management unit to the one or more load power management units.