JPH02149143A - Optical transmission path signal multiplexing system - Google Patents

Abstract

PURPOSE:To attain the multiplexing of fast data and the transmission of a large amount of data by applying time-division multiplex on plural pieces of data, transmitting it as an optical signal on which wavelength multiplexing is applied, and separating a received optical signal to individual data by applying time separation after performing wavelength separation. CONSTITUTION:A transmission side which multiplexes the plural pieces of data and outputs the optical signal is constituted of signal multiplexing parts 1 and 2 which perform the time- division multiplex of the plural pieces of data, electrical-optical conversion parts 3-5 which convert the signals of the signal multiplexing parts 1 and 2 to the optical signals with different wavelength lambda1 - lambda3, and a multiplexer 6 which performs the wavelength multiplexing of those optical signals. Also, a reception side which performs the data separation of the optical signal transmitted on an optical transmission path is constituted of a demultiplexer 7 which separates a transmitted optical signal to different wavelength lambda1 - lambda3, optical-element conversion parts 8-10 which convert the optical signals with wavelength lambda1 - lambda3 to electrical signals, and signal separation parts 11-12 which separate time-division multiplexed electrical signal to the individual data. In such a way, it is possible to perform the transmission of the fast data without increasing the circuit scale of an electrical signal multiplexing part and a signal separation part and by multiplexing a large amount of data.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a signal multiplexing method in an optical transmission line.

[Conventional technology]

Conventionally, as a signal multiplexing method using a single optical transmission path, for example, a time division multiplexing method has been used in which a plurality of data are transmitted in time series using a single wavelength light source. Also,
A wavelength multiplexing method is also used in which light sources with different wavelengths are prepared for each of a plurality of pieces of data, these lights are combined and transmitted using an optical combiner, and separated using an optical demultiplexer.

(Problems to be Solved by the Invention) Among the conventional signal multiplexing methods described above, in the former time division multiplexing method, when multiplexing multiple high-speed data is attempted,
There is a problem in that the electrical circuit scale of the signal multiplexing section and the signal separating section becomes large. In addition, the wavelength multiplexing method is
Although high-speed data can be multiplexed relatively easily, there is a problem in that the number of multiplexed channels cannot be increased too much due to spectral characteristics, and the number of transmitted data is limited.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems at once and provide a signal multiplexing system that enables high-speed data multiplexing and transmission of a large number of data.

[Means to solve the problem]

The optical transfer path signal multiplexing system of the present invention includes a transmitting side that multiplexes multiple pieces of data and outputs an optical signal, a signal multiplexing unit that time-division multiplexes multiple pieces of data, and a signal multiplexing unit that outputs different signals from the signal multiplexing unit. It consists of an electrical-to-optical converter that converts wavelengths into optical signals, and a multiplexer that wavelength-multiplexes these optical signals.

In addition, the receiving side separates the optical signal transmitted through the optical transmission line into an electrical signal, and the receiving side includes a demultiplexer that separates the transmitted optical signal into different wavelengths, and a demultiplexer that converts the optical signal of each wavelength into an electrical signal. It consists of an optical-to-electrical converter and a signal separator that separates a time-division multiplexed electrical signal into each data.

[Effect]

In the above configuration, on the transmitting side, a plurality of pieces of data are time-division multiplexed into optical signals of different wavelengths, and these are outputted to the optical transmission line as wavelength-multiplexed optical signals. Furthermore, on the receiving side, the received optical signal is wavelength-separated and time-separated to separate it into individual data.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being a block diagram of the transmitting side, and FIG. 2 being a block diagram of the receiving side.

In FIG. 1, on the transmitting side, there are a plurality of input terminals II~!, here five input terminals! , the input terminals It and Ig are connected to a signal multiplexing unit (MUX) 1 that time-division multiplexes signals, and the input terminals 1 . ,I.

is connected to the signal multiplexing section 2. Each signal multiplexer 1.2 is an electrical-optical converter (
Elo) 3.4 respectively.

Note that the input terminal I is directly connected to the electrical-optical converter 5. These electric-optical converters 3, 4.5 each have a different wavelength λ1. λ2. Convert to λ3. Each of the electrical-optical converters 3, 4.5 is connected to a multiplexer 6 that performs optical synthesis.

On the other hand, as shown in FIG. 2, the receiving side receives the manually generated multiplexed optical signals at different wavelengths λ1. λ2. A branching filter 7 that separates the signal into λ3 is connected to the input terminal I0. Optical-to-electrical converters (0/E) 8, 9, and 10 are connected to the demultiplexer 7, and each optical-to-electrical converter 8.9 is connected to a signal separation unit (DMUX).
11.12 are connected, and output terminals 05.0□, 0@, and 04 are connected to these signal separation units 11.12, respectively.

Note that the output terminal O2 is directly connected to the optical-electrical converter 10.

According to the above configuration, on the transmission side, as shown in FIG. 1, the data input to the input terminals It', L and I3, 14 are
The signals are electrically time-division multiplexed in a signal multiplexer 1.2, and further converted into optical signals of different wavelength islands, λ2, in an electro-optical converter 3.4. Furthermore, the data input to the input terminal I5 is further converted into an optical signal of a different wavelength λ in the electro-optical converter 5 without being electrically multiplexed. Each optical signal is then wavelength-multiplexed in the multiplexer 6 and output to the transmission line from the output terminal O0.

On the receiving side, as shown in FIG. 2, the wavelength-multiplexed signal input to the input terminal I0 through the transmission line is sent to the demultiplexer 7 to receive different wavelengths λ8, . λ2. λ.

separated into The light of each wavelength is then transmitted to optical-to-electrical converters 8, 9, respectively. '10 converts it into an electrical signal. The signal that has passed through the optical-to-electrical converter 8.9 is further separated from the time-division multiplexed signal by a signal separator 11.12, and returned to the same format as before multiplexing. The signals are output from output terminals 01.02 and 03, 04, respectively. Furthermore, since the signal passing through the optical-to-electrical converter 10 is not time-division multiplexed, it is output as is to the output terminal 05.

Therefore, since this method combines time division multiplexing and optical wavelength multiplexing, the number of data to be multiplexed in the end can be close to the number of time division multiplexes and the multiplier of optical wavelength multiplexing. Although the amount of data to be converted is large, electrical multiplexing is
The burden of optical multiplexing can be reduced. Thereby, while multiplexing a large amount of data, it is possible to reduce the circuit scale of the electrical signal multiplexing section and the signal separating section.

Note that although the above embodiment shows an example in which five data are multiplexed and one of the data is not electrically multiplexed, the present invention can be similarly applied even when a different number of data is multiplexed. Needless to say.

〔Effect of the invention〕

As explained above, the present invention transmits a plurality of data as time-division multiplexed and wavelength-multiplexed optical signals over an optical transmission line, wavelength-separates the received optical signals, and time-separates them to separate individual data. Since the time division multiplexing method and the optical wavelength multiplexing method are combined, it is possible to handle a large amount of data without increasing the circuit scale of the electrical signal multiplexing section and signal separation section. This has the effect of allowing high-speed data transmission using a single optical transmission line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a transmitting side according to an embodiment of the present invention, and FIG. 2 is a block diagram of a receiving side according to an embodiment of the present invention. 1.2...Signal multiplexing unit (MUX), 3,4.5...
・Electric-optical converter (Elo), 6... Multiplexer, 7.
... splitter, 8. 9. 10... Optical-electric conversion section (
0/E), 11.12... Signal separation section (DMUX),
■. ~I. ...Input terminal, 06-0. ...Output terminal.

Claims (1)

[Claims] 1. In a signal multiplexing method in which an optical signal in which multiple pieces of data are multiplexed is output from a transmitting side to an optical transmission line, and the optical signal transmitted through this optical transmission line is data-separated as an electrical signal on a receiving side, the transmitting On the side, there is a signal multiplexing unit that time-division multiplexes multiple data, an electrical-to-optical conversion unit that converts the signals of this signal multiplexing unit into optical signals of different wavelengths, and a multiplexing unit that wavelength-multiplexes these optical signals. The receiving side includes a demultiplexer that separates the transmitted optical signal into different wavelengths, an optical-to-electrical converter that converts the optical signal of each wavelength into an electrical signal, and a time-division multiplexed electrical signal. An optical transmission line signal multiplexing system characterized by comprising a signal separation unit that separates a signal into each data.