公开(公告)号：US20190074908A1

公开(公告)日：2019-03-07

申请号：US15696939

申请日：2017-09-06

Applicant: Nokia Solutions and Networks OY

Inventor： Sian Chong Lee ,  Vincent Houtsma ,  Doutje van Veen ,  Chen Zhu ,  Noriaki Kaneda ,  Michael Eggleston

IPC: H04B10/61 ,  G06F11/14

Abstract: A coherent optical receiver having an analog electrical circuit connected to combine the outputs of multiple photodetectors to generate an electrical output signal from which the data encoded in a received modulated optical signal can be recovered in a robust and straightforward manner. In an example embodiment, the analog electrical circuit includes one or more transimpedance amplifiers connected between the photodetectors and the receiver's output port. The coherent optical receiver may include a dual-polarization optical hybrid coupled to eight photodiodes to enable polarization-insensitive detection of the received modulated optical signal. The signal processing implemented in the analog electrical circuit advantageously enables the use of relatively inexpensive local-oscillator sources that may have relaxed specifications with respect to linewidth and wavelength stability. Different embodiments of the analog electrical circuit can be used to enable the receiver to receive amplitude- and intensity-encoded modulated optical signals.

公开(公告)号：US12228631B1

公开(公告)日：2025-02-18

申请号：US18791959

申请日：2024-08-01

Applicant: Nokia Solutions and Networks Oy

Inventor： Ioannis Kimionis ,  Michael Eggleston ,  Eleftherios Kampianakis ,  Traian Abrudan

IPC: G01S13/00 ,  G01S13/36

Abstract: A multistatic backscatter system may comprise unsynchronized devices. The unsynchronized device may comprise two or more spatially separated transmitter devices to transmit carrier signals, a transmitter device being configured to transmit carrier signals over a frequency set of two or more different frequencies; at least one backscatter device configured to frequency-shift the carrier signals, modulate data on at least some of the carrier signals, and backscatter modulated frequency-shifted carrier signals as backscatter signals, and at least one receiver device configured to receive the carrier signals and the backscatter signals, to process them to obtain the data and determine ranging information for the backscatter device.