JPH0479625A - Light relaying system - Google Patents

Abstract

PURPOSE:To prevent the degradation in the quality of a light transmitting line by using one light relay housing an 1R and 3R light relays in an enclosure as an n-th light relay. CONSTITUTION:Plural 1R light relays 3 are connected in series between terminal stations A1 and B5 facing each other and a light relay 4 housing a 1R and 3R light relays 3 and 2 is arranged instead of the 1R relay positioned near the midpoint of the serial connection. Therefore, the S/N deterioration of the whole system can be prevented and the occurrence of jitters can be suppressed. In addition, though the possibility of occurrence of a change in the relaying interval on th input side of the 3R light relay exists depending upon the fault repairing time and faulty point when only the 3R relay is arranged at the n-th position, there is no need for arranging the 3-R relay in this system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical repeating system, and particularly to an optical repeating system using an optical direct amplifier.

2. Description of the Related Art In the conventional optical repeating system, the optical repeating system shown in FIG. 3 was realized using only the 3R optical repeater shown in FIG. 4 or only the 1R optical repeater shown in FIG. 5.

Problems to be Solved by the Invention However, in the optical repeating system using the 3R optical repeater shown in FIG.
Optical repeaters are required every 0km.

Furthermore, in the optical repeating system using a 1R optical repeater, optical amplifier noise is added to the signal light, which causes S/N deterioration, increased jitter, etc., and deteriorates line quality.

The present invention has been made in view of the above-mentioned conventional situation,
Therefore, an object of the present invention is to provide a novel optical repeating system that makes it possible to solve the above-mentioned problems inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, the optical relay system according to the present invention is as follows:
A system in which two or more 1R optical repeaters are connected in series is characterized by using at least one optical repeater containing a 1R optical repeater and a 3R optical repeater in one housing.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a conceptual diagram of an optical repeater system according to the present invention, and FIG. 2 is a conceptual diagram showing an embodiment of an optical repeater in which a 1R optical intermediate equipment 3R optical repeater is accommodated in the same housing. .

As shown in Fig. 1, a plurality of three 1R optical miscellaneous devices are connected in series between the terminal station A1 and the opposing station B5, and the 1RR located near the midpoint of the series connection is connected in series. In place of the repeater 3, as shown in FIG. 2, an optical repeater 4 housing a 1R optical intermediate device 33R optical repeater 2 is placed in the same housing to realize an optical repeater system.

As shown in FIG. 4, the 3R optical repeater 2 includes an 0/E converter 6, an equalization amplifier circuit 7, a timing extraction circuit 8,
Identification circuit 9, LD drive circuit 10, and E10 converter 11
It has equalization amplification, retiming, and reproduction functions.

The 1R optical repeater 3 includes a multiplexer 12 as shown in FIG.
, a fiber amplifier 13, a demultiplexer 14, and a pumping light source 15, and has an optical direct amplification function.

According to the optical repeating system of the present invention described in detail, an optical repeater that houses a 1R optical miscellaneous device, a 1R optical miscellaneous device, and a 3R optical repeater in the same housing can be used as a 1R optical miscellaneous device. by placing it at the n-th position from the center or end station of an optical relay transmission system configured as an optical relay.

(1) It becomes possible to prevent S/N deterioration of the entire system.

(2) Jitter can be suppressed.

(3) When repairing a fault when only a 3R optical repeater is placed at the There's no need.

Effects such as this can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing an embodiment of the optical relay system according to the present invention, and Fig. 2 is a conceptual diagram showing an embodiment of the optical relay system according to the present invention.
A conceptual diagram of an integrated optical repeater, Figure 3 is a conceptual diagram showing a conventional optical repeater system, and Figure 4 is a conceptual diagram of a conventional optical repeater system.
A block diagram of an R optical repeater. FIG. 5 is a block diagram of a 1R optical intermediate device used in a conventional optical repeater system. 1...Terminal station A, 2...3R optical repeater, 3...1R
Optical optical miscellaneous equipment 4...lR13R integrated repeater, 5...
Terminal station B (opposite station), 6... 0/E converter, 7... Equalization amplifier circuit, 8... Timing extraction circuit, 9... Identification circuit, 10... LD drive circuit, 11... E10 converter, 12... Multiplexer, 13... Fiber amplifier,
14... Demultiplexer, 15... Excitation light source Figure 1

Claims (2)

[Claims] (1) In an optical relay system in which two or more 1R optical repeaters housed in one housing are connected, a 1R optical repeater and a 3R optical repeater are connected in one housing as the n-th optical repeater. At least one optical repeater is connected to the optical repeater accommodated in the one housing.
An optical repeater system characterized by using one optical repeater that accommodates an R optical repeater and a 3R optical repeater. (2) The optical repeater according to claim (1), further characterized in that the 1R optical repeater has an optical direct amplification function, and the 3R optical repeater has an equalization amplification, retiming, and regeneration function. Relay method.