JPS63245027A - Optical communication equipment - Google Patents

Abstract

PURPOSE:To transmit a signal with a broad band through plural channels at a high speed by applying wavelength multiplexing to plural optical signals with different wavelength sent from an optical transmission section at a photocoupler and using an optical reception section to receive optical signals of each wavelength so as to apply optical communication between the optical reception sections at a prescribed wavelength. CONSTITUTION:Optical signals lambda1-lambdaN outputted from a plural light sources 14(1)-14(N) with different stimulated wavelength and optical signals lambdaN+1 outputted from the reception sections 17(1)-17(M) are given respectively to the photocoupler 16, where the optical signals lambda1-N+1 are subject to wavelength multiplex and the optical signal subject to wavelength multiplex is demultiplexed into output optical fibers 19(1)-19(M). The demultiplexed optical signals 19(1)-19(M) are sent to the reception sections 17(1)-17(M) via the optical fibers 19(1)-19(M). Thus, the high speed/broad band signal such as a video signal is transmitted through multi-channel between the optical transmission section and the optical reception section.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical communication device using an optical coupler.

2. Description of the Related Art Optical couplers are often used in star-type optical LANs or for optical distribution when transmitting to a large number of subscribers, and optical couplers with various structures have been proposed in recent years.

A conventional optical communication device that realizes wavelength division multiplexing optical communication using an optical coupler has a configuration shown in FIG. 2, for example.

A plurality of light sources 1 (1), l (2) with different emission wavelengths
) ,..., 1 Optical signal λ1 output from (N)
．． λ2. ..., λN are input optical fibers 2 (1
), 2 (2), ..., 2 (N) and then input to the optical coupler 3. In the optical coupler 3, each optical signal λ1, λ2
．． ..., λN is wavelength-multiplexed, and the wavelength-multiplexed optical signal is sent to the output optical fiber 4 (1), 4 T2).
,..., 4(M), the 0-branched optical signal passes through each output optical fiber to optical receivers 5(1), 5(2).
), ..., 5 (M). Each optical receiver includes a demultiplexer 6(1) and 6(21).

..., 6 (M) and an optical/electrical converter (abbreviated as O/E in the figure) 7 (1), 7 T2),
...? (M), and the optical signals transmitted to each optical receiver 51), 5(2), ..., 5(M) are splitter 6(11, 6(21, ..., 6
(M) for each wavelength λ1. λ2. ..., λN, and optical/electrical converters 7(1), 7(2),...
,? (M) is configured to convert it into an electrical signal. (For example, Japanese Patent Application No. Sho 61-147348) Furthermore, an optical communication device that realizes mutual communication between optical receivers has a configuration as shown in FIG. 3, for example.

That is, in FIG. 3, the optical coupler 8 includes a plurality of terminals 9 (11, 9(2)) each having a pair of optical transmitting/receiving means.

..., 9 (N) are connected to the input optical fiber 10 (1).

10 (2) , . . . , optical transmitting means 11 (11, IO2), . . . connected to the optical coupler via 10 (N).
, 11(N), an optical signal λ output from a certain optical transmitter is input to an optical coupler via an input optical fiber.

The optical signal λ is connected to each output fiber 12 (11
, 12(2), . . . , 12(N), and each optical receiving means 13(1), 13(21, . . . , 13(N))
It is configured to be transmitted to At that time, each terminal is
MA/CD (Carrier 5ense
Multi Access/Corrision De
Optical communication can be performed even more efficiently by controlling communication using the communication control procedure of (For example, “Mitsubishi Electric Technical Report J Vol. 60, paragraphs 657 to 62
2) Problems to be Solved by the Invention As shown in Figure 2, it is possible to wavelength multiplex multiple optical signals with different wavelengths using one optical coupler, and to branch optical signals to many output sections with low loss. can do. However, with these configurations, it is only possible to realize communication in which the optical receiver receives an optical signal transmitted in a trickle from the optical transmitter, that is, only one-way optical communication between the optical transmitter and the optical receiver. It has not been possible to realize mutual communication between the optical receivers.

Furthermore, as shown in FIG. 3, there is also an example in which mutual optical communication between optical receiving sections is realized via an optical coupler. However, although these configurations are effective for relatively low-speed data communications and communications with low transmission path occupancy, they are not suitable for transmitting high-speed, wideband signals such as video signals that also have high transmission path occupancy. In this case, signal collisions occur frequently on the transmission path, making it impossible for terminals to communicate with each other.

The present invention eliminates the above problems and provides an optical communication device that transmits high-speed, wideband signals such as video signals through multiple channels, and also enables mutual optical communication between optical receivers.

Means for Solving the Problems In order to solve the above problems, the optical communication device of the present invention includes:
Each optical receiving section is provided with an optical transmitting means for transmitting an optical signal λ having a different wavelength from the optical signal transmitted from the optical transmitting section, and an optical coupler is provided along with a plurality of optical signals having different wavelengths transmitted from the optical transmitting section. Wavelength multiplexing is performed in the optical receiver, optical signals of each wavelength are received in the optical receiver, and mutual optical communication between the optical receivers is enabled using the wavelength λ.

Effect: By the above-mentioned means, it is possible not only to receive a plurality of optical signals from the optical transmitter in each receiver, but also to perform mutual communication between the receivers, thereby providing a highly flexible optical communication device. .

Embodiment Hereinafter, an optical communication device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

Multiple light sources 14(1), 14(2) with different emission wavelengths
,...

The optical signals λl, λ2 . ...,
λN are input optical fibers 15(1) and 15(2), respectively.
, . . . , 15(N) and then input to the optical coupler 16. Also, each optical receiver 17 (1).

17 (2) , . . . , 17 (M) is a light source 1B (1) with an emission wavelength of λN+1.

18(2), . . . , 18(11) are provided, and the optical signal λN+1 outputted from each receiving section is transmitted through input optical fibers 15(N+1), 15(N+2), .
, 15(N+M) and is input to the optical coupler 16.

In the optical coupler, each optical signal λ1. λ2. ....

λN and λN+1 are wavelength-multiplexed, and the wavelength-multiplexed optical signals are sent to output optical fibers 19(1), 19(2),
..., 19(M). The branched optical signals are transmitted to each optical receiver via each output optical fiber. Each optical receiver has a demultiplexer 20 (11, 20(2), . . .
, 20 (M) and an optical/electrical converter (abbreviated as O/E in the figure) 21 (11°21 +21 , . . .
21 (M), and the optical signals λl, λ2 . ..., λN, λN+1 are separated by wavelengths λl, λ2 . ..., λN, λN+
1 and converted into an electrical signal by an optical/electrical converter.

Therefore, not only can high-speed, wideband signals such as video signals be transmitted across multiple channels between the optical transmitter and the optical receiver, but also
Optical communication between the optical receivers can be performed using an optical signal of wavelength λN+1.

Further, by using the CSMA/CD communication control procedure for optical communication at wavelength λN+1 in each receiving section, more efficient optical communication between the optical receiving sections can be performed.

Effects of the Invention The present invention enables multi-channel transmission of high-speed, wideband signals such as video signals between an optical transmitter and a receiver through a single optical coupler, and also enables efficient optical communication between the optical receivers. can be done.

Further, since wavelength multiplexing and branching are performed using an optical coupler, highly reliable optical communication can be performed with relatively low loss and the ability to branch optical signals to many receiving sections.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an optical communication device according to an embodiment of the present invention, and FIG.
The figure is a block diagram showing a conventional optical communication device, and FIG. 3 is a block diagram showing a conventional optical communication device. 14(IL 14(21,..., 14(N)...
...Light source, 27...Optical coupler, 22...
・Optical transmitter, 17 (11, 17 (21,..., 17
(M)...Optical receiving section, 20(1), 20(
2),..., 20 (M)...... splitter.

Claims (2)

[Claims] (1) An optical coupler that wavelength-multiplexes a plurality of optical signals with different wavelengths and branches the wavelength-multiplexed optical signal into a plurality of output parts; an optical transmitter that transmits data through an optical transmission line to the input port of the
an optical receiver that receives a wavelength-multiplexed optical signal output from an output port of the optical coupler through an optical transmission line and selects a desired optical signal, and the optical receiver includes an optical transmitter. , a function of transmitting an optical signal of wavelength λN+1 to the input port of the optical coupler through the optical transmission line, and a function of transmitting the wavelength-multiplexed optical signal of wavelength λ1 to λN+1 output from the output port of the optical coupler to the optical transmission line. What is claimed is: 1. An optical communication device characterized by having a function of receiving signals through a wavelength λN+1, and enabling mutual communication between receiving sections in optical communication at a wavelength λN+1. (2) At wavelength λN+1, CSM
The optical communication device according to claim 1, wherein the optical receiving sections communicate with each other according to an A/CD communication control procedure.