# US 12,009,866 B2 · Method and an apparatus for transitioning between optical networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,866 B2 - Document ID: US12009866B2 - Status: Granted - Kind: B2 - Application number: 18/181,286 - Filed: 2023-03-09 - Published: 2023-07-06 - Granted: 2024-06-11 - Earliest claimed: 2020-07-31 - Assignees: AT&T Intellectual Property I, L.P. - Applicants: AT&T Intellectual Property I, L.P. - Inventors: Ricky Perry; Kent McCammon - Web page: https://patentgrep.com/patent/US12009866B2 ## CPC - H04B 10/572: Wavelength control - H04B 10/25752: {Optical arrangements for wireless networks} - H04B 10/25753: {Distribution optical network, e.g. between a base station and a plurality of remote units} - H04B 10/27: Arrangements for networking - H04B 10/2912: {characterised by the medium used for amplification or processing} - H04B 10/516: Details of coding or modulation - H04Q 11/0062: {Network aspects} - H04Q 2011/0011: {using wavelength conversion} - H04Q 2011/0088: {Signalling aspects} - H04B: TRANSMISSION - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) ## Abstract Aspects of the subject disclosure may include, for example, receiving a first optical signal from a first optical network via a first port of the wavelength converter, receiving a second optical signal from a second optical network via a second port of the wavelength converter, modulating the first optical signal with the second light signal to generate a third optical signal, eliminating the first light signal from the third optical signal to generate a fourth optical signal, and transmitting the fourth optical signal through the second optical network. The first optical signal can include a first digital signal modulated onto a first light signal of a first wavelength, the second optical signal can include a second light signal can include a second wavelength different from the first wavelength, and the fourth optical signal can include the first digital signal modulated onto the second light signal. Other embodiments are disclosed. ## Claims ### Claim 1 A method, comprising: receiving, by a wavelength converter of an optical communication system, a first optical signal of a first optical network of the optical communication system, wherein the first optical signal comprises a first digital signal modulated onto a first light signal, and wherein the first light signal comprises a first wavelength; selecting, by a switch of the optical communication system, a second light signal of a plurality of light signals of a plurality of wavelengths optically coupled a second optical network of the optical communication system according to a user input to the switch, wherein the second light signal comprises a second wavelength; receiving, by the wavelength converter of the optical communication system, the second light signal of the plurality of light signals of the second optical network from the switch according to the selecting the second light signal by the switch of the optical communication system; combining, by the wavelength converter of the optical communication system, the first optical signal with the second light signal to generate a modulated optical signal, wherein the combining further comprises modulating the first optical signal and the second light signal via an optical amplifier to generate the modulated optical signal; eliminating, by the wavelength converter of the optical communication system, the first light signal from the modulated optical signal to generate a third optical signal, wherein the third optical signal comprises the first digital signal modulated onto the second light signal; and transmitting, by the wavelength converter of the optical communication system, the third optical signal to the second optical network. ### Claim 2 (depends on 1) The method of claim 1, wherein the first optical signal is optically coupled to the first optical network. ### Claim 3 (depends on 1) The method of claim 1, wherein the first optical network comprises a gray optical network, and wherein the second optical network comprises a colored optical network. ### Claim 4 (depends on 1) The method of claim 1, wherein the third optical signal is coupled to the second optical network of the optical communication system. ### Claim 5 (depends on 1) The method of claim 1, wherein the second wavelength of the second light signal differs from the first wavelength of the first light signal of the first optical signal. ### Claim 6 (depends on 1) The method of claim 1, wherein the second light signal of the plurality of light signals further comprises a second digital signal, and wherein the wavelength converter of the optical communication system further eliminates the second digital signal from the second light signal prior to the combining the first optical signal with the second light signal. ### Claim 7 (depends on 1) The method of claim 1, wherein the eliminating the first light signal from the modulated optical signal comprises optically filtering the modulated optical signal. ### Claim 8 (depends on 1) The method of claim 1, wherein the first optical signal is further optically coupled to a wireless communication network via the first optical network, and wherein the first optical signal is further optically coupled to a first radio element of the wireless communication network. ### Claim 9 (depends on 1) The method of claim 1, wherein the first optical signal is further optically coupled to a wireless communication network via the first optical network, and wherein the third optical signal is further coupled to a second radio element of the wireless communication network. ### Claim 10 (depends on 1) The method of claim 1, wherein the second optical network further comprises a passive dense wavelength division multiplexing network. ### Claim 11 (depends on 1) The method of claim 1, wherein the second wavelength of the second light signal is a specific wavelength associated with dense wavelength division multiplexing. ### Claim 12 An optical communication system, comprising: a first optical network; a second optical network; a wavelength converter coupled between the first optical network and the second optical network; and a switch coupled between the second optical network and the wavelength converter, to facilitate performing operations comprising: receiving, by the wavelength converter, a first optical signal of a first optical network, wherein the first optical signal comprises a first digital signal modulated onto a first light signal; selecting, by the switch, a second light signal of a plurality of light signals of a plurality of wavelengths optically coupled a second optical network according to a user input to the switch; receiving, by the wavelength converter, the second light signal of the plurality of light signals of the second optical network from the switch according to the selecting the second light signal by the switch; combining, by the wavelength converter, the first optical signal with the second light signal to generate a modulated optical signal, wherein the combining further comprises modulating the first optical signal and the second light signal via an optical amplifier to generate the modulated optical signal; eliminating, by the wavelength converter, the first light signal from the modulated optical signal to generate a third optical signal, wherein the third optical signal comprises the first digital signal modulated onto the second light signal; and transmitting, by the wavelength converter, the third optical signal to the second optical network. ### Claim 13 (depends on 12) The optical communication system of claim 12, wherein the first optical signal is optically coupled to the first optical network, and wherein the third optical signal is optically coupled to the second optical network. ### Claim 14 (depends on 12) The optical communication system of claim 12, wherein the first optical network comprises a gray optical network, and wherein the second optical network comprises a colored optical network. ### Claim 15 (depends on 12) The optical communication system of claim 12, wherein the first light signal comprises a first wavelength and wherein the second light signal comprises a second wavelength, and wherein the second wavelength of the second light signal differs from the first wavelength of the first light signal of the first optical signal. ### Claim 16 (depends on 12) The optical communication system of claim 12, wherein the second light signal of the plurality of light signals further comprises a second digital signal, and wherein the wavelength converter of the optical communication system further eliminates the second digital signal from the second light signal prior to the combining the first optical signal with the second light signal. ### Claim 17 (depends on 12) The optical communication system of claim 12, wherein the first optical signal is further optically coupled to a wireless communication network via the first optical network, and wherein the first optical signal is further optically coupled to a first radio element of the wireless communication network, and wherein the third optical signal is further coupled to a second radio element of the wireless communication network. ### Claim 18 A method, comprising: receiving, by a wavelength converter of an optical communication system, a first optical signal of a first optical network of the optical communication system, wherein the first optical signal comprises a first digital signal modulated onto a first light signal; selecting, by a switch of the optical communication system, a second light signal of a plurality of light signals of a plurality of wavelengths optically coupled a second optical network of the optical communication system according to a user input to the switch; receiving, by the wavelength converter of the optical communication system, the second light signal of the plurality of light signals of the second optical network from the switch according to the selecting the second light signal by the switch of the optical communication system; combining, by the wavelength converter of the optical communication system, the first optical signal with the second light signal to generate a modulated optical signal, wherein the combining further comprises modulating the first optical signal and the second light signal to generate the modulated optical signal; eliminating, by the wavelength converter of the optical communication system, the first light signal from the modulated optical signal to generate a third optical signal, wherein the third optical signal comprises the first digital signal modulated onto the second light signal; and transmitting, by the wavelength converter of the optical communication system, the third optical signal to the second optical network. ### Claim 19 (depends on 18) The method of claim 18, wherein the first optical signal is optically coupled to the first optical network, and wherein the third optical signal is optically coupled to the second optical network. ### Claim 20 (depends on 18) The method of claim 18, wherein the first optical network comprises a gray optical network, and wherein the second optical network comprises a colored optical network.