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Optical transmission system and optical repeater

A relay device and optical transmission technology, applied in transmission systems, electromagnetic wave transmission systems, electromagnetic repeaters, etc., can solve problems such as increased cost and inability to be easily adopted

Active Publication Date: 2009-04-08
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the laying of a new electrical communication line managed by the optical relay device requires large-scale construction, there is a problem of cost increase.
In addition, when there is no room for laying new electrical communication lines, it is necessary to abandon the management of optical relay devices
[0011] On the other hand, it is also considered to perform optical multiplexing using an optical signal of a wavelength dedicated to the management of the optical relay device, which is different from the light of the wavelength normally used in the optical transmission system. Multiplexing device, so it cannot be easily adopted from the viewpoint of cost, space margin, etc.

Method used

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  • Optical transmission system and optical repeater
  • Optical transmission system and optical repeater
  • Optical transmission system and optical repeater

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0061] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0062] FIG. 1 is a configuration diagram of a PON-type optical transmission system according to a first embodiment of the present invention.

[0063] In FIG. 1 , a CATV or the like has an optical transmission line having optical fibers 2 and 3 connected to an optical line terminal (OLT) 1 on the center side, and is connected to an optical coupler 5 via an optical relay device 4 . Optical coupler (optical multiplexer and demultiplexer) 5 is split into multiple optical transmission paths through optical fibers 6-1, ... 6-n and optical line terminal units (ONU) 7-1, ... 7 of multiple user residences -n (n is a natural number) connected. The ONUs 7-1, ... 7-n each consist of an optical transceiver 8a and an ONU function 8b connected thereto.

[0064] Here, the term ONU generally includes the function of an optical transceiver. However, when describing the presen...

no. 2 approach

[0091] FIG. 5 is a block diagram showing a configuration of an optical relay device used in an optical transmission system according to a second embodiment of the present invention, showing a configuration that further embodies the optical relay device 4 shown in FIG. 1 . In FIG. 5 , the same reference numerals as in FIG. 1 denote the same elements.

[0092] In Fig. 5, the electric line 23 connecting the first EO / OE part 21 and the second EO / OE part 22 has a first electric line 23a for transmitting electrical signals in the downstream direction and a second electric line 23b for transmitting electric signals in the upward direction . A first electric signal connection part 61 for branching electric signals to the ONU function part 27 and the drive circuit 68 is connected in the middle of the first electric line 23 a. A second electrical signal connection unit 62 that multiplexes an output electrical signal of a predetermined channel output from the ONU function unit 27 to an ...

no. 3 approach

[0107] FIG. 6 is a diagram showing an optical transmission system according to a third embodiment of the present invention, and the same reference numerals as in FIG. 1 denote the same elements.

[0108] In Fig. 6, a plurality of optical relay devices 4-1, ... 4-m with the same structure as the optical relay device 4 shown in Fig. 1 are connected via optical fiber 2a between OTL1 and optical coupler 5, by making the number Further long-distance optical transmission can be realized by increasing.

[0109] Thus, there is no need to install electrical communication lines for the management of the optical relay devices 4-1, ... 4-m, or to install light with different wavelengths from the optical relay devices 4-1, ... 4-m for management. In the case of the transmission path, in the installation of another dedicated line for management, the ONU function unit 27 of electrical signals can multiplex the management signal to the existing PON optical transmission path.

[0110] The ONU...

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Abstract

An optical repeater connected to an optical transmission line between an optical network unit having an ONU function on the side of a subscriber and an optical line termination (OLT) on the side of a center includes first electrical / optical conversion means connected to a first optical transmission line on the side of the center, a second electrical / optical conversion means connected to a second optical transmission line on the side of the subscriber, and transmission means connected between the first electrical / optical conversion means and the second electrical / optical conversion means to transmit an optical repeater supervisory signal between the optical transmission lines.

Description

technical field [0001] The invention relates to an optical transmission system and an optical relay device, in particular to a PON type optical transmission system and an optical relay device. Background technique [0002] In optical networks such as FTTH and CATV, a PON (Passive Optical Network) type optical transmission system is used that divides the optical transmission line connected to the center with a passive splitter and lays it to multiple user houses. Such an optical transmission system is also called PDS (Passive Double Star). [0003] In this kind of optical transmission system, the splitter is connected to the optical fiber leading from the OSU (Optical Subscriber Unit) in the optical line terminal device (OLT: Optical Line Termination) in the center to the user side, and passes through the splitter. The splitter divides into multiple optical transmission lines and connects optical line terminal units (ONU: Optical Network Unit) of multiple users through optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/16H04B10/08H04B10/17H04B10/077H04B10/272H04B10/29
CPCH04B10/077H04B10/272H04J3/1694H04B10/29
Inventor 下大迫和隆
Owner FURUKAWA ELECTRIC CO LTD
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