Passive wavelength division mobile fronthaul network system

• US 10,439,710 B2
• Filed: 09/11/2018
• Issued: 10/08/2019
• Est. Priority Date: 01/25/2017
• Status: Active Grant

• Current Assignee: T&S Communications Co.,Ltd.
• Original Assignee: T&S Communications Co.,Ltd.
• Inventors: Hou, Dan, Huang, Shu, Wu, Jindong
• Primary Examiner(s): Payne, David C
• Assistant Examiner(s): Barua, Pranesh K
• Application Number:
  US16/128,480
• Publication Number:
  US 20190028190A1
• Time in Patent Office: 392 Days
• CPC Class Codes: H04B 10/071 using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
• CPC Class Codes: H04B 10/25753 Distribution optical network, e.g. between a base station and a plurality of remote units
• CPC Class Codes: H04B 10/27 Arrangements for networking
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 14/0282 WDM tree architectures

Abstract

A passive wavelength division mobile fronthaul network system includes a central office end, a remote end, a trunk optical fiber; a first transport unit, configured to transport, on one end of the trunk optical fiber, detection light to the trunk optical fiber; a second transport unit, configured to transport, on the other end of the trunk optical fiber, the detection light from the trunk optical fiber to each branch of the remote end; and a reflector, deployed on an end of each branch of the remote end for reflecting the detection light. The first transport unit combines the detection light to the trunk optical fiber, the second transport unit transmits, on the remote end, the detection light from the trunk optical fiber to each branch of the remote end, and finally, the reflector returns the detection light along the original path.

Claims

1. A passive wavelength division mobile fronthaul network system, comprising a central office end, a remote end, and a trunk optical fiber, and further comprising a detector, a first wavelength division multiplexing apparatus, a second wavelength division multiplexing apparatus, an optical transport unit, and a reflector, wherein an optical path can be formed between the detector and the first wavelength division multiplexing apparatus, one end of the trunk optical fiber is connected to the first wavelength division multiplexing apparatus, the other end of the trunk optical fiber is connected to the second wavelength division multiplexing apparatus;

the optical transport unit can transmit detection light from an output end of the second wavelength division multiplexing apparatus to each branch of the remote end, and the reflector is deployed on an end of each branch of the remote end;

further comprising a two-stage switcher and a detection device, wherein the two-stage switcher comprises a light extractor, a first-stage light switcher, a wavelength division multiplexer, and a second-stage light switcher, the light extractor is mounted on the trunk optical fiber, the first-stage light switcher receives light output by the light extractor, the wavelength division multiplexer transmits light between the first-stage light switcher and the second-stage light switcher, and the detection device receives light output by the second-stage light switcher; and

further comprising a second splitter or a third-stage light switcher, wherein the wavelength division multiplexer receives, by using the second splitter or the third-stage light switcher, light output by the first-stage light switcher, and the second-stage light switcher receives light output by the second splitter or the third-stage light switcher.

2. The passive wavelength division mobile fronthaul network system according to claim 1, wherein the wavelength division multiplexer is replaced with a coarse wavelength division multiplexer and a dense wavelength division multiplexer that receives light output by the coarse wavelength division multiplexer, the first-stage light switcher outputs light to the coarse wavelength division multiplexer, and the second-stage light switcher receives light emitted from the dense wavelength division multiplexer.

3. The passive wavelength division mobile fronthaul network system according to claim 1, wherein there are two or more two-stage switchers, one of the two-stage switchers collects uplink signals on the trunk optical fiber, and one of the two-stage switchers collects downlink signals on the trunk optical fiber;

or one of the two-stage switchers collects a half of signals of the trunk optical fiber, and one of the two-stage switcher collects the other half of signals of the trunk optical fiber.

4. The passive wavelength division mobile fronthaul network system according to claim 1, further comprising at least one terminal, wherein the terminal is connected to the two-stage switcher and/or the detection device, and the terminal can send an alarm signal.

5. The passive wavelength division mobile fronthaul network system according to claim 1, wherein the first wavelength division multiplexing apparatus consists of a central office end wavelength division multiplexer provided with a detection light channel, or consists of a central office end wavelength division multiplexer provided with no detection light channel and a first add/drop multiplexer;

the second wavelength division multiplexing apparatus consists of a remote end wavelength division multiplexer provided with a detection light channel, or consists of a remote end wavelength division multiplexer provided with no detection light channel and a second add/drop multiplexer;

the optical transport unit comprises a first splitter and a third add/drop multiplexer;

the first splitter can extract light between the second wavelength division multiplexing apparatus and the third add/drop multiplexer; and

the third add/drop multiplexer is deployed on a branch of the remote end.

6. The passive wavelength division mobile fronthaul network system according to claim 5, further comprising a third splitter, wherein detection light emitted by the detector is transmitted to the detection light channel and/or the first add/drop multiplexer of the central office end wavelength division multiplexer after being transmitted to the third splitter, there is at least one detector, and there is at least one third splitter.