JPS6287677A - Wavelength multiplexing light transmitter - Google Patents

Abstract

PURPOSE:To form a transmitter in simplified constitution being easily designed while to enhance its reliability, by transmitting mutually different electric signals as a light signal of mutually different wavelength so as to omit a transmission data coding circuit, reception data coding circuit and a reception clock reproducing circuit. CONSTITUTION:Transmission data are converted into transmission light data S11. While a transmission clock is also converted into a transmission light clock S12 of wavelength different from the wavelength of the transmission light data S11. These transmission light data S11 and transmission light clock S12, being mixed in a light synthesizer 5, are transmitted as combined light data S15 through a light transmission line 6. And this combined light data S15 is separated by a light distributor 7 into components of reception light data S13 and reception light clock S14 further converted into reception data and reception clock as an electric signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wavelength multiplexing optical transmission device that converts a required electrical signal into an optical signal and transmits the optical signal in a wavelength multiplexed manner.

[Conventional technology]

FIG. 2 shows a conventional transmission device. In the figure, Sl is transmission data, S2 is a transmission clock, 1 is a transmission data encoding circuit for encoding transmission data S1, and 2 is encoded data. 85 is a reception data decoding circuit for returning the same reception data S3 as the original transmission data 81; 3 is a reception clock recovery circuit for extracting the clock from the encoded data S5 and making it the reception clock s4; 4 is a transmission data code. This is a transmission line that connects the conversion circuit 1, the reception data decoding circuit 2, and the reception clock recovery circuit 3, and is used for data transmission.

Next, the operation will be explained. On the transmitting side, the transmitting data S1 is encoded by the transmitting data encoding circuit 1 at a timing based on the transmitting clock S2 so that the receiving side can easily reproduce the receiving clock 84, etc., and becomes encoded data S5.

The transmission data encoding circuit 1 uses the NRZI method, for example, as shown in FIG. 3, to vary the bit pattern of the transmission data S1 and convert it into encoded data S5. This encoded data S5 is sent to the transmission line 4 and received by the reception data decoding circuit 2 and reception clock recovery circuit 3 on the reception side. The received data decoding circuit 2 decodes the encoded data S5 encoded by the transmitting side and returns it to the same received data S3 as the original transmitted data S1. The reception clock recovery circuit 3 extracts the reception clock S from the received encoded data S5.
Play 4.

Here, the reception clock recovery circuit 3 performs the following operation shown in FIG. 4, for example. The received data S3 is sampled using a clock that is 32 times faster than the transmission speed,
Reception clock S4 which is the output of reception clock regeneration circuit 3
The most stable timing is to output to the center of the encoded data bit cell, and this is controlled by the following procedure. Divide 32 clocks into 1,000 equal parts, each with A
I.

Bl, B2. Let's call it A2.

Now, if a change in received data S3 occurs at A1,
Since the receive clock A of the receive clocks S4 is close to the received data cells, the next receive clock B is generated at 30 clocks, which is 32 clocks minus 12. Similarly, when it is B1, 31 cloves are generated. Conversely, when a change in the received data S3 occurs at B2, f is generated at 33 clocks, and similarly at A2, it is generated at 34 clocks.

In this way, the receiving side obtains received data S3 and received clog S4. In addition, when sending as an optical signal, the encoded data S5 may be converted into an optical signal. Of course, at this time,
Requires electrical-to-optical conversion equipment and optical-to-electrical conversion equipment.

[Problem that the invention seeks to solve]

Since the conventional transmission device is configured as described above, a transmission data encoding circuit, a reception data decoding circuit, and a reception clock recovery circuit are required, and a high frequency such as 32 times the transmission speed is required for sampling reception data. It requires a clock and is easily affected by noise, etc., and it not only lowers the actual transmission speed and transmission efficiency of the transmission data encoding circuit, but also makes it difficult to design the transmission data encoding circuit and increases the cost. There were problems such as high prices.

This invention was made to solve the above-mentioned problems, and by transmitting data etc. using light of different wavelengths, a transmission data encoding circuit, a reception data decoding circuit, and a reception clock recovery circuit can be realized. An object of the present invention is to obtain a highly reliable wavelength multiplexing optical transmission device that has a simple configuration that does not require the use of circuits.

[Means for solving problems]

A wavelength multiplexing optical transmission device according to the present invention is an optical transmission device in which optical signals for optical transmission are made to correspond to different electric signals for transmission so that they have different wavelengths.

[For production]

The wavelength multiplexing optical transmission device of the present invention facilitates signal processing before and after transmission by optically transmitting different transmission electrical signals as optical signals of different wavelengths.

〔Example〕

An embodiment of the present invention will be explained below with reference to the figures.

In FIG. 1, S11 is transmission light data of an optical signal corresponding to the above-mentioned transmission data s1, and is composed of monochromatic light having a wavelength λ. (S12) is a transmission optical clock of an optical signal according to the above-mentioned transmission clock (B2), and has a wavelength λ2 (however,
It consists of monochromatic light of λ1Nλ2). Reference numeral 5 denotes a light combiner such as a Y-shaped thin film optical waveguide.
-The transmitted optical data 811 and the transmitted optical clock 812 are combined and outputted from the l path as combined optical data 315. 6
is a single optical transmission line used for inputting and optically transmitting the combined optical data S15, which is the output light of the optical combiner 5, and is, for example, a single optical fiber. Reference numeral 7 denotes an optical splitter, which receives composite optical data 815 that is the output light of the optical transmission line 6.
is incident and the wavelength λ8. λ, the light is separately distributed and emitted. The light distributor 7 may be, for example, a dichroic mirror.

Next, the operation of this embodiment will be explained. The transmission data S1 is converted into an optical signal by a first 13 air-to-optical converter (not shown), and is made into transmission optical data 811 having a wavelength λ. Further, the transmission clock S2 is converted into an optical signal by a second electro-optical converter (not shown), and the transmission optical clock S2 having a wavelength λ is
It is said to be 12.

The above-mentioned transmission optical data 811 and transmission optical clock 812
The light enters the light combiner 5 from each path, is mixed by the light combiner 5, becomes combined light data 815, and exits from one path. This composite light data 8 consisting of wavelengths λ1 and λ2
15 is emitted from the optical combiner 5 and then transmitted to the optical distributor 7 via the optical transmission line 6. The optical splitter 7 separates and outputs the combined optical data 815 into received optical data 813 of wavelength λ1 and received optical clock 814 of wavelength λ2. The received optical data 813, the transmitted optical data 811, the received optical clock 814, and the transmitted optical clock 812 are in exactly the same state. Here, if the received optical data S13 and the received optical clock 814 are converted into electrical signals by respective optical-to-electrical converters (not shown), the transmitted data S1 and the transmitted clock S2 can be easily reproduced.

In addition, the transmission optical data 811 and the transmission optical clock 812
are not necessarily monochromatic light, but may be optical signals having different wavelength ranges, in which the wavelength ranges do not overlap much. In this case, if the wavelengths of the peak values of the wavelength range are different, it will be considered as a different wavelength optical signal, and even if the optical signal is a combination of a specific wavelength and a specific wavelength range, the specific wavelength and the specific wavelength range If the wavelengths of the peak values of the signals are different, it is said that the optical signals have different wavelengths. In addition, the optical distributor 7 may include various optical devices such as a combination of a beam splitter and a filter, a diffraction grating, and a prism.

Although an optical fiber was used as the transmission line in the above embodiment, any type of fiber that can transmit two-component data may be used. For example, a waveguide for passing sound waves or the like is used as the transmission path, and in this case, the light combiner is replaced by a sound wave combiner, the optical divider is replaced by a sound divider, etc.

〔Effect of the invention〕

As described above, according to the present invention, since the transmitting optical data and the transmitting optical clock are optically transmitted using optical signals of different wavelengths, the transmitting data encoding circuit, the receiving data decoding circuit, and the receiving clock The regeneration circuit can be omitted, the structure is simple and inexpensive, the design is easy, and the sieve is reliable.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing a conventional transmission equipment (...! composition diagram, Fig. 3 is an example of the encoding method in fke shown in Fig. 2). 4 is a waveform diagram of the receiving side of i fff in FIG. data, S12 is the transmission optical clock, S13 is the reception optical data, S14 is the reception optical clock, S
15 is synthetic light data. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Indication of the case: Special patent application, No. 60-227227 No. 2, Name of the invention: Wavelength multiplexing optical transmission device 3, Person making the amendment Relationship to the case: License/applicant address: Chiyo, Tobu, 2-chome, Marunouchi, ward Numbers 2 and 3 Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent Postal code 105 Address
1-4-10-5, Nishishinka, Minato-ku, Tokyo, Detailed explanation of the invention column 6 of the specification to be amended, Contents of the amendment H) "Thousand equal parts" on page 3, line 20 of the specification. Correct that by saying it is divided into four equal parts. (2) Mei 71+lll, page 6, line 6 r (51
2) replaces the above transmission clock (S 2 ) J with [
S12 is corrected with the above-mentioned transmission clock S2J. that's all

Claims (3)

[Claims] (1) In an optical transmission device that converts different electrical signals into optical signals and transmits them via an optical transmission line, the optical signals have different wavelengths corresponding to the different electrical signals. A wavelength multiplexing optical transmission device characterized by: (2) A patent characterized in that an optical splitter is provided on the output side of the optical transmission line for inputting the optical signal emitted from the optical transmission line, distributing the optical signal according to the different wavelengths, and outputting each of the wavelengths. A wavelength multiplexed optical transmission device according to claim 1. (3) A light combiner is provided on the input side of the optical transmission line for inputting the optical signals from different paths and outputting the optical signals from the same path to the optical transmission line. 3. The wavelength multiplexing optical transmission device according to item 1 or 2.