US 2019/0158211 A1Published application

Method and System for Establishing at Least Two Bidirectional Communication Links Using Coherent Detection

AssigneeADVA Optical Networking SE

InventorsCornelius Fürst, Thomas Richter, Sorin Tibuleac

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method for establishing bidirectional communication links includes: supplying, to at least two optical transceiver modules at each side of at least two optical paths, a multiplexed optical CW signal comprising at least two optical CW signals having the same differing wavelengths, and modulating the multiplexed optical CW signal according to modulation signals; creating, at each side of the optical paths, at least two first and second optical transmit signals by optically filtering the modulated optical signals so that only a single wavelength remains, and routing pairs of a first and second optical transmit signal to the optical paths, wherein the optical transmit signals of each pair have differing wavelengths and wherein the optical transmit signals transmitted in the same direction over the same optical paths have differing wavelengths; receiving each optical transmit signals at a dedicated optical transceiver module by mixing it with the multiplexed optical CW signal.

Claims20

Dependent claims

A method for establishing at least two bidirectional communication links using coherent detection, the method comprising the steps of

(a) providing, at each of a first and a second side of at least a first and a second optical path, at least two optical transceiver modules, wherein each optical transceiver module comprises an optical modulator and a coherent optical receiver, each optical modulator having an input port, a modulation port and an output port and each coherent optical receiver having a local oscillator port, a receiving port and an output port, wherein an input port of each optical transceiver module is connected by an optical 1×2 power splitter device to the optical modulator input port and the coherent optical receiver input port,
(b) creating, at each of the first and second sides of the optical paths, a multiplexed optical continuous-wave (CW) signal comprising at least two optical CW signals having differing wavelengths, wherein the CW signals created at the first side and the CW signals created at the second side have the same or approximately the same wavelengths,
(c) supplying the multiplexed optical CW signal to the input port of each optical transceiver module,
(d) creating, at an output port of each optical modulator, which defines an output port of the optical transceiver module, a modulated optical signal which includes information of one or more modulation signals that are supplied to the modulation port of the corresponding optical modulator,
(e) creating, at each of the first and second sides of the optical paths, at least two first and second optical transmit signals by optically filtering each of the modulated optical signals in such a way that only a single wavelength remains, and routing each at least one pair of a dedicated first and second optical transmit signal that is used to establish the at least two bidirectional communication links to a dedicated one of the at least first and second optical paths, wherein the first and second optical transmit signals of each pair have differing wavelengths and wherein the first and second optical transmit signals that are transmitted in the same direction over the same optical paths have differing wavelengths,
(f) routing, at each of the first and second sides of the optical paths, each of the at least two first and second optical transmit signals to a receiving port of a dedicated coherent optical receiver, and
(g) creating, at the output port of each coherent optical receiver, one or more electrical receive signals by mixing the respective optical transmit signal that is supplied to the receiving port and the multiplexed optical CW signal.

4 more elements

A multiple optical transceiver device for establishing at least two bidirectional communication links using coherent detection comprising

(a) at least two optical transceiver modules, each comprising an optical modulator and a coherent optical receiver, each optical modulator having an input port, a modulation port and an output port and each coherent optical receiver having a local oscillator port, a receiving port and an output port, wherein an input port of each optical transceiver module is connected by an optical 1×2 power splitter device to the optical modulator input port and the coherent optical receiver input port, and
(b) an optical continuous-wave (CW) source which is configured to create a multiplexed optical CW signal comprising at least two optical CW signals each having a wavelength differing from the wavelengths of the other optical CW signals,
(c) wherein each optical modulator is configured to create, at the output port, a modulated optical signal which includes information of one or more modulation signals that are supplied to the modulation port by modulating a multiplexed optical CW signal that is supplied to its input port and comprises power portions of each of the optical CW signals, and
(d) wherein each coherent optical receiver is configured to create, at the output port, one or more electrical receive signals by mixing the respective optical transmit signal that is supplied to the receiving port and the multiplexed optical CW signal.

1 more element

A coherent optical transmission system for establishing at least two bidirectional communication links using coherent detection comprising at least a first and a second optical path having a first and a second end, and a first and a second multiple optical transceiver device provided at the first and second ends of the first and second optical paths, respectively, each multiple optical transceiver device comprising

(a) at least two optical transceiver modules, each comprising an optical modulator and a coherent optical receiver, each optical modulator having an input port, a modulation port and an output port and each coherent optical receiver having a local oscillator port, a receiving port and an output port, wherein an input port of each optical transceiver module is connected by an optical 1×2 power splitter device to the optical modulator input port and the coherent optical receiver input port, and
(b) an optical continuous-wave (CW) source which is configured to create a multiplexed optical CW signal comprising at least two optical CW signals each having a wavelength differing from the wavelengths of the other optical CW signals,
(c) wherein each optical modulator is configured to create, at the output port, a modulated optical signal which includes information of one or more modulation signals that are supplied to the modulation port by modulating a multiplexed optical CW signal that is supplied to its input port and comprises power portions of each of the optical CW signals, and
(d) wherein each coherent optical receiver is configured to create, at the output port, one or more electrical receive signals by mixing the respective optical transmit signal that is supplied to the receiving port and the multiplexed optical CW signal,
(e) wherein each of the first and second multiple optical transceiver devices comprises an optical path separating and filtering device, which is configured to connect the at least two optical transceiver modules to at least a first and a second optical path, the optical path separating and filtering device comprising, for each of the at least first and second optical paths, at least one pair of a first and second separating port and a combining port, the combining port being connected to the respective optical path, the first separating port of each pair being connected to the output port of the optical modulator of a dedicated optical transceiver module and the second separating port of each pair being connected to the receiving port of the coherent optical receiver of a dedicated optical transceiver module,
(f) wherein the optical path separating and filtering device is configured to filter and route the modulated optical signals that are received at the first separation port in such a way that a corresponding optical transmit signal comprising only a single wavelength is output only at the respective combination port, wherein, in case multiple optical transmit signals are routed to the same optical path, the respective optical transmit signals have differing wavelengths, and wherein the number of optical transmit signals that are output at each of the combination ports is equal to or less than half of the number of optical CW sources, and
(g) wherein the optical path separating and filtering device is configured to route each of the optical transmit signals that are received at the combination ports and have a wavelength equal or essentially equal to one of the wavelengths of the CW sources to a respective dedicated second separating port only.

4 more elements

Dependencies are inferred from the claim text.