METHOD FOR SHARING OPTICAL FIBER FOR CLOUD-BASED WIRED AND WIRELESS ACCESS NETWORK, AND SYSTEM AND APPARATUS FOR SAME

• US 20140233591A1
• Filed: 09/26/2012
• Published: 08/21/2014
• Est. Priority Date: 09/26/2011
• Status: Active Grant

• Current Assignee: HFR, Inc., SK Telecom Co., Ltd.
• Original Assignee: HFR, Inc., SK Telecom Co., Ltd.
• Inventors: Kim, Sang-Woo, Park, Chan, Cho, Beum-Geun, Song, Myung-Hun, Byun, Sungjin, Lee, Sun-Ik, Sung, Jinsoo, Lim, Jong-Yeong, Lee, Eun-Ho
• Granted Patent: US 9,596,048 B2
• Time in Patent Office: Days
• US Class Current: 370/535
• CPC Class Codes: H04B 10/27 Arrangements for networking
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0241 Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
• CPC Class Codes: H04J 14/0254 Optical medium access
• CPC Class Codes: H04J 14/0267 Optical signaling or routing
• CPC Class Codes: H04J 14/0283 WDM ring architectures
• CPC Class Codes: H04J 14/0287 Protection in WDM systems

Abstract

A system for sharing an optical fiber for a cloud-based wired and wireless access network, includes: a centralization device to generate summing signals by respectively summing multi-channel optical signals input from a wireless donor unit group and by summing multi-channel wired signals input from a wired donor unit group or generate wavelength-converted signals by wavelength-converting the multi-channel optical signals or the multi-channel wired signals, multiplex the summing signals or the wavelength-converted signals, and distribute the summing signals or the wavelength-converted signals to a plurality of devices connected to the centralization device via a shared optical fiber; and a distribution device group to generate corresponding optical signals by demultiplexing the summing signals or the wavelength-converted signals in units of wavelengths, and transmit the corresponding optical signals or the multi-channel wired signals to a wireless remote unit group and/or a wired remote unit group via a preset optical fiber.

Claims

1. A system for sharing an optical fiber for a cloud-based wired and wireless access network, the system comprising:

a centralization device configured to

generate summing signals by respectively summing multi-channel optical signals input from a wireless donor unit group and by summing multi-channel wired signals input from a wired donor unit group or generate wavelength-converted signals by wavelength-converting the optical signals or the wired signals,

multiplex either the summing signals or the wavelength-converted signals in units of wavelengths, and

distribute either the summing signals or the wavelength-converted signals to a plurality of devices connected to the centralization device by shared optical fibers; and

a distribution device group configured to

generate optical signals by demultiplexing the summing signals or the wavelength-converted signals in units of wavelengths, and

transmit the corresponding optical signals or the multi-channel wired signals to at least one of a wireless remote unit group and a wired remote unit group via a preset optical fiber.

2. A centralization device, comprising:

a first transmission rate converter configured to

determine transmission rates of multi-channel optical signals input from a wireless donor unit group and transmission rates of multi-channel wired signals input from a wired donor unit group, and

generate summing signals by respectively summing the multi-channel optical signals and summing the multi-channel wired signals based on the transmission rates of the multi-channel optical signals and the transmission rates of the multi-channel wired signals; and

a first wavelength division multiplexer configured to

separate the summing signals in units of wavelengths or multiplex the summing signals separated in units of wavelengths,

control to distribute the summing signals to a distribution device connected to the first wavelength division multiplexer via a shared optical fiber,

and cause the distribution device to perform a signal processing using the summing signals.

3. The centralization device of claim 2, wherein the first transmission rate converter comprises:

a first wireless transmission rate converter configured to generate a first wireless summing signal by summing first wireless optical signals representing the optical signals input from the wireless donor unit group; and

a first wired transmission rate converter configured to generate a first wired summing signal by summing first wired signals representing the multi-channel wired signals input from the wired donor unit group.

4. The centralization device of claim 3, wherein the first wavelength division multiplexer comprises:

a first dense wavelength division multiplexer configured to generate second summing signals by multiplexing dense components of the first wireless summing signal and the first wired summing signal in units of wavelengths; and

a first coarse wavelength division multiplexer configured to generate coarse-multiplexed second summing signals by multiplexing coarse components of the second summing signals in units of wavelengths and distribute the coarse-multiplexed second summing signals to the shared optical fiber.

5. The centralization device of claim 3, further comprising:

a first wavelength converter configured to generate wireless wavelength-converted signals by wavelength-converting the first wireless optical signals; and

a first electro-optical converter configured to generate wired wavelength-converted signals by wavelength-converting the first wired signals.

6. The centralization device of claim 5, wherein the first wavelength converter comprises:

a first optical receiver module configured to receive the first wireless optical signals from the wireless donor unit group;

a first clock recovery unit configured to generate the wireless wavelength-converted signals obtained by wavelength-converting the first wireless optical signals as third wireless optical signals; and

a first optical transmitter module configured to transmit the third wireless optical signals to the first wavelength division multiplexer.

7. The centralization device of claim 5, wherein the first electro-optical converter comprises:

a first wired optical receiver module configured to receive the first wired signals from the wired donor unit group;

a first wired clock recovery unit configured to generate the wired wavelength-converted signals obtained by wavelength-converting the first wired optical signals as third wired signals; and

a first wired optical transmitter module configured to transmit the third wired signals to the first wavelength division multiplexer.

8. The centralization device of claim 3, wherein the first wireless transmission rate converter comprises:

a first low transmission rate optical module configured to receive the first wireless optical signals of a low transmission rate; and

a first low transmission rate clock recovery unit configured to wavelength-convert the first wireless optical signals.

9. The centralization device of claim 8, wherein the first wireless transmission rate converter comprises:

a summing signal generator configured to generate the first wireless summing signal by summing the first wireless optical signals;

a first high transmission rate clock recovery unit configured to wavelength-convert the first wireless summing signal; and

a first high transmission rate optical module configured to generate the first wireless summing signal at a high transmission rate.

10. The centralization device of claim 3, wherein the first wired transmission rate converter comprises:

a first wired low transmission rate optical module configured to receive the first wired signals of a low transmission rate; and

a first wired low transmission rate clock recovery unit configured to wavelength-convert and output the first wired signals.

11. The centralization device of claim 10, wherein the first wired transmission rate converter comprises:

a wired summing signal generator configured to generate the first wired summing signal by summing the first wired signals;

a first wired high transmission rate clock recovery unit configured to wavelength-convert the first wired summing signal; and

a first wired high transmission rate optical module configured to generate the first wired summing signal at a high transmission rate.

12. A distribution device, comprising:

a second wavelength division multiplexer configured to receive summing signals from a centralization device connected to the distribution device by a shared optical fiber and demultiplex the summing signals in units of wavelengths; and

a second transmission rate converter configured to convert the summing signals into optical signals and transmit the optical signals to at least one group of a wireless remote unit group and a wired remote unit group via a preset optical fiber according to transmission rate.

13. The distribution device of claim 12, wherein the second transmission rate converter comprises:

a second wireless transmission rate converter configured to transmit the corresponding optical signals generated by converting coarse-multiplexed second summing signals representing the summing signals received from the centralization device, as second wireless optical signals to the wireless remote unit group; and

a second wired transmission rate converter configured to transmit wired signals which are generated by converting the coarse-multiplexed second summing signals representing the summing signals received from the centralization device, as second wired signals to the wired remote unit group.

14. The distribution device of claim 13, wherein the second wavelength division multiplexer comprises:

a second coarse wavelength division multiplexer configured to generate third summing signals by demultiplexing coarse components of coarse-multiplexed second summing signals from the shared optical fiber in units of wavelengths; and

a second dense wavelength division multiplexer configured to generate a fourth wireless summing signal and a fourth wired summing signal by demultiplexing dense components of the third summing signals in units of wavelengths.

15. The distribution device of claim 13, further comprising:

a second wavelength converter configured to generate second wireless optical signals by performing a wavelength-conversion on wavelength-converted signals received from the wavelength division multiplexer; and

a second optical-electro converter configured to generate the second wired signals by performing a wavelength-conversion on the wavelength-converted signals received from the wavelength division multiplexer.

16. The distribution device of claim 15, wherein the second wavelength converter comprises:

a second optical receiver module configured to receive fourth wireless optical signals from the second wavelength division multiplexer;

a second clock recovery unit configured to generate the second wireless optical signals by wavelength-converting the fourth wireless optical signals; and

a second optical transmitter module configured to transmit the second wireless optical signals to the wireless remote unit group.

17. The distribution device of claim 15, wherein the second optical-electro converter comprises:

a second wired optical receiver module configured to receive fourth wired signals from the second wavelength division multiplexer;

a second wired clock recovery unit configured to generate the second wired signals by wavelength-converting the fourth wired signals; and

a second wired optical transmitter module configured to transmit the second wired signals to the wired remote unit group.

18. The distribution device of claim 15, wherein the second wireless transmission rate converter comprises:

a second high transmission rate optical module configured to receive a fourth wired summing signal of a high transmission rate; and

a second high transmission rate clock recovery unit configured to wavelength-convert the fourth wireless summing signal.

19. The distribution device of claim 18, wherein the second wireless transmission rate converter comprises:

a summing signal decomposer configured to generate the second wireless optical signals by decomposing the fourth wireless summing signal;

a second low transmission rate clock recovery unit configured to wavelength-convert the second wireless optical signals; and

a second high transmission rate optical module configured to generate the second wireless optical signals at a low transmission rate.

20. The distribution device of claim 13, wherein the second wired transmission rate converter comprises:

a second wired high transmission rate optical module configured to receive the fourth wired summing signal of a high transmission rate; and

a second wired high transmission rate clock recovery unit configured to wavelength-convert and output the fourth wired summing signal.

21. The distribution device of claim 20, wherein the second wired transmission rate converter comprises:

a wired summing signal decomposer configured to generate the second wired signals by decomposing the fourth wired summing signal;

a second wired low transmission rate clock recovery unit configured to wavelength-convert the second wired signals; and

a second wired high transmission rate optical module configured to generate the second wired signals at a low transmission rate.

22. A method, performed by a system, for sharing an optical fiber for a cloud-based wired and wireless access network, the method comprising:

generating, by a centralization device, summing signals by respectively summing multi-channel optical signals input from a wireless donor unit group and by summing multi-channel wired signals input from a wired donor unit group or generating wavelength-converted signals by wavelength-converting the optical signals or the wired signals,

multiplexing, by a centralization device, either the summing signals or the wavelength-converted signals in units of wavelengths, and

distributing, by a centralization device, either the summing signals or the wavelength-converted signals to a plurality of devices connected to the centralization device by a shared optical fiber; and

generating, by a distribution device, corresponding optical signals by demultiplexing in units of wavelengths the summing signals or the wavelength-converted signals received from the centralization device, and

transmitting, by the distribution device, the corresponding optical signals or the multi-channel wired signals to at least one of a wireless remote unit group and a wired remote unit group via a preset optical fiber.