JPS61263339A - Optical intermediate repeater - Google Patents

Abstract

PURPOSE:To make it easy to extract or to insert a low-order group signal by extracting a required low-order group signal by a selector after the received optical signal of a high-order group is converted to plural low-order group signals, inserting a new low-order group signal, and sending it out after converting it to an original high-order group signal. CONSTITUTION:The optical signal of the high-order group is converted to an electrical signal at an optical receiver 1 and furthermore, it is converted to the low-order group signal at a serial/parallel converter 2 and is supplied to a selector 4. At this stage, the selector 4 selects the signal to be extracted out of the low-order group signals and supplies it to a destuff/stuff.INF unit 5 and a signal DS3 is outputted to an outside. On the other hand, the signal DS3 supplied from the outside is inserted to the frequency band of an extracted low-order group signal through the destuff/stuff.INF unit 5 and the selector 4 and is converted to the high-order group signal and is outputted as the optical signal.

Description

[Detailed Description of the Invention] [Summary] A received high-order group optical signal is converted into an electrical signal and then converted into a plurality of low-order group signals, and a desired low-order group signal is obtained from the converted low-order group signals. This is an optical intermediate repeater that extracts a new low-order group signal, converts it into a high-order group optical signal, and sends it out.

[Industrial application field]

The present invention relates to an optical intermediate repeater configured to extract a desired low-order group signal from a received high-order group optical signal and to insert a desired low-order group signal.

[Conventional technology]

Conventionally, an optical transmission type intermediate repeater has been designed to perform optical-to-electrical conversion of an optical signal and then perform electrical-to-optical conversion, with the purpose of performing waveform shaping of the signal during this conversion. For this reason 1
For example, an optical transmission line is created to transmit a high-order group signal obtained by multiplexing n low-order group signals, and a station placed in the middle of the optical transmission line extracts m (man) low-order group signals and creates a new one. In order to insert m or less low-order group signals into
As shown in the figure, it was necessary to use device A and device B as optical demultiplexing terminal stations. The details will be explained below.

Device A and device B in FIG. 1 are demultiplexing bee stations,
The received optical signal (1) and optical signal (4) are sent to the optical receiver (
OR) 21-1.22-1 converts it into an electrical signal. Then, it is converted into a low-order group signal by a demodulator (DMUX) 21-2, 22-2.

It is extracted as a low-order group (DS3) signal via the interface (INTF) 21-3.22-3. On the other hand, the DS3 signal to be inserted is the interface 21-7.22.
-7 to the modulator (MUX) 21-5, 22-5. The signals input to the modulators 21-5, 22-5 are converted into higher-order group signals by the clock signals supplied from the clock generators 21-6, 22-6, and are further transmitted to the optical transmitters (O3) 21-4. 22-4, the high-order group optical signal (3) and optical signal (2) are sent out to the optical transmission line, respectively.

[Problem that the invention seeks to solve]

In the conventional optical intermediate repeater, as shown in FIG.

If you try to extract a desired low-order group signal from a high-order group signal transmitted through an optical transmission line and insert a new low-order group signal, you will need two demultiplexing optical terminal stations, which will cause the relay station to There was a problem in that the scale of the device could not be reduced.

[Means for solving problems]

The present invention first converts a high-order group signal transmitted through an optical transmission line into a plurality of low-order group signals, and then extracts a desired one from the low-order group signals using a selector and takes it out to the outside. A low-order group signal is inserted through a selector, converted into a single high-order group signal, and sent to an optical transmission line.

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 1.8 is the optical receiver (OR), 2.9 is the serial
Parallel converter (S/P), 3 is drop/insert device, 4.10 is selector (SEL), 5 is destuff/stuff/INF unit 6.11 is parallel/serial converter (P/S), 7 .12 is the optical transmitter (O8)
represents.

[Effect]

In FIG. 1, an optical signal (1) is a high-order optical signal, and is subjected to optical-to-electrical conversion by an optical receiver 1. The high-order group signals subjected to line-optical/electrical conversion are converted into a plurality of low-order group signals by the S/P 2 and supplied to the selector 4 .

The selector 4 selects one to be taken out from among the plurality of low-order group signals and performs destuffing/stuffing/IN.
Supplied to F unit 5. As a result, the external
33 signal is sent out. On the other hand, the externally supplied DS
3 (No. 8 is Destaff/Staff INF Unit 5
The signal is inputted to the selector 4 via the P/S 6, inserted into a position corresponding to the frequency band of the low-order group signal taken out to the outside, and converted into a high-order group signal by the P/S 6. The converted higher-order group signals are converted into optical signals by the optical transmitter 7, and sent out to the optical transmission line as optical signals (2). Drop/insert device 3 is surrounded by dotted lines in Figure 1.
functions to extract a desired low-order group signal from a high-order group signal and to insert a desired low-order group signal.

Similarly, for the optical signal (4) of the higher order group in FIG. 1, the optical receiver 8.3/P9. A desired low-order group signal is extracted by the selector 10 and the destuff/stuff/INF unit 5, and the destuff/stuff/INF unit 5. Selector 10°P/S 11 and optical transmitter 1
2, a low-order group signal is inserted and the optical signal (3
) is sent out to the optical transmission line. By employing the configuration as described above, it becomes possible to extract a desired low-order group signal and insert a desired low-order group signal using a simple configuration.

〔Example〕

FIG. 2 shows a configuration diagram of one embodiment of the present invention.

In the figure, 13-1. 13-2 is a synchronization separation circuit (SY
NC), 14-1.14-2 is a pulse generator (PG)
, 15-1. 15-2 is destuff (DSTF)
, 16-1.16-2 is staff (STF>, 17-1
．． 17-2 represents an interface (INTF). Note that numerals 1 to 12 in FIG. 9 have the same functions as those shown in FIG.

In FIG. 2, the optical signal (11 in FIG. 1 is a high-order group optical signal) is subjected to optical-to-electrical conversion by the optical receiver 1.

The high-order group signals that have been subjected to line-light-to-electrical conversion are converted into a plurality of low-order group signals by the S/P2, as described above, and are input to the selector 4.

At this time, the S/P 2
converts the high-order group signal into a predetermined low-order group signal. Then, a desired low-order group signal is selected from among the plurality of low-order group signals inputted to the selector 4, and restored using the destuffing 15-1, and the interface 17-1
The signal is extracted to the outside as a low-order group DS3 signal (sound multiplexed signal) as shown in the figure. Of course.

There are also low-order group signals that are not extracted by the selector 4 but are directly guided to the P/S 6.

On the other hand, a DS3 signal to be inserted from the outside is input to the selector 4 via the interface 17-2 and the staff 16-1. Due to this.

A new low-order group signal input from the outside is inserted corresponding to the frequency band of the low-order group signal taken out to the outside via the previously described destuffing 15-1.

Then, a series of low-order group signals including the inserted low-order group signal are input to the P/S 6 and converted into high-order group signals. The converted higher-order group signal is converted into a higher-order group optical signal by the optical transmitter 7.

It is sent out to the optical transmission line as an optical signal (2).

A signal that lights up in the same way 8. S/P9. Synchronous separation circuit 13-2
．． Pulse generator 14-2. Selector 10° destuff 1
5-2. Interface 17-1゜17-2. Staff 16-2. By the P/Sll and the optical transmitter 12,
A desired low-order group signal is extracted from the high-order group optical signal (4), and a new low-order group signal is inserted into the extracted frequency band as a high-order group optical signal (3) through an optical transmission path. will be sent to.

[Effects of the Invention] As explained above, according to the present invention, a high-order group signal transmitted through an optical transmission line is once converted into a plurality of low-order group signals, and then a desired one is selected from the low-order group signals by a selector. At the same time, a new low-order group signal is inserted from the outside into the frequency band of the low-order group signal taken out to the outside through a selector, converted into a single high-order group signal, and then sent to the optical transmission line. Because it adopts a configuration that transmits optical signals, it is not only possible to relay optical signals, but also to extract a desired low-order group signal from a high-order group signal with a simple circuit configuration. It becomes possible to insert the signal into the higher-order group and send it out.

[Brief explanation of drawings]

Figure 1 is a block diagram of the principle of the present invention, and Figure 2 is a block diagram of the principle of the present invention.
Embodiment Configuration Diagram FIG. 3 shows a configuration diagram of a conventional optical intermediate repeater. In the figure, 1.8 is the optical receiver (OR), 2.9 is the serial
Parallel converter (S/P), 3 is drop/insert device, 4.10 is selector (SEL), 5 is destaf/staff/INF unit), 6.11 is parallel/serial converter (P/S ), 7.12 is the optical transmitter (O8)
represents.

Claims (1)

[Scope of Claims] An optical system configured to relay a high-order group optical signal obtained by multiplexing a low-order group transmission signal, and to input/output any low-order group optical signal included in the high-order group optical signal as necessary. The intermediate relay device includes an optical receiver (1) (8) that converts the received high-order group optical signal into an electrical signal, and a high-order group optical signal that is converted into an electrical signal by the optical receiver (1) (8). Serial-to-parallel converters (2) (9) that convert signals into a plurality of low-order group signals; Selectors (4) (10) that extract low-order group signals and insert low-order group signals; and parallel-to-serial converters (6) (11) that convert low-order group signals into high-order group signals. and an optical transmitter (7) that converts the high-order group signals converted by the parallel-to-serial converters (6) and (11) into optical signals.
) (12).