JP2002176413A - Optical signal transmission method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical signal transmission method and system that can efficiently transmit optical signals corresponding to serial digital data on the basis of digital information signals such as digital video and audio signals through a common optical signal transmission cable. SOLUTION: First, second and third serial digital data are respectively converted into 1st, 2nd and 3rd optical signals respectively with about 1.55 μm, about 1.3 μm, and about 0.83 μm, using a multiplexer means to apply multiplex processing to two of the 1st, 2nd and 3rd optical signals generates a 1st multiplex optical signal, using a multiplexer means to apply multiplex processing to the 1st multiplex optical signal and the rest of the 1st, 2nd and 3rd optical signals generates a 2nd multiplex optical signal and the 2nd multiplex optical signal is transmitted through an optical signal transmission cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention described in the claims of the present application relates to, for example, a method for converting a plurality of serial digital data based on digital video data and the like obtained from a plurality of video cameras into a plurality of serial digital data having different center wavelengths. The present invention relates to an optical signal transmission method for converting the optical signal into an optical signal and transmitting the optical signal through an optical signal transmission line formed by, for example, an optical fiber, and an optical signal transmission device used for implementing the method.

[0002]

2. Description of the Related Art In the field of transmission of digital information signals relating to various kinds of information, digital information signals are converted into serial digital data, and the serial digital data is transmitted using a coaxial cable or a twisted pair line. An optical signal transmission system that converts serial digital data into an optical signal and transmits the optical signal through an optical signal transmission cable formed using an optical fiber has been put into practical use. Among them, the optical signal transmission system has an extremely large transmission signal capacity of the optical signal transmission cable, and excellent transmission efficiency can be easily obtained.

Under these circumstances, in the field of video signals representing image information, digitalization of signals has been attempted from the viewpoint of diversifying transmitted information and improving the quality of reproduced images. 2. Description of the Related Art A video camera (digital video camera device) for generating a converted video signal, that is, a digital video signal, has been put to practical use. Then, serial digital data based on the digital video signal from the video camera is obtained so that the digital video signal obtained from the video camera can be transmitted by the optical signal transmission system. It has been proposed to convert this into an optical signal representing

When transmitting an optical signal based on a digital video signal obtained from a video camera through an optical transmission line formed using optical fibers in an optical signal transmission system, a digital video signal obtained from one video camera is used. Transmission of optical signals based on digital information signals such as a plurality of digital video signals obtained from a plurality of video cameras and associated digital audio signals, for example. May be required. When such simultaneous transmission of a plurality of optical signals is required, it is needless to say that the required optical signal transmission cable can be easily obtained and the transmission efficiency is good. It is.

As described above, when simultaneous transmission of a plurality of optical signals based on a plurality of digital video signals respectively obtained from a plurality of video cameras is required, the digital video signals obtained from each video camera are usually ,
It follows the standardized data format. Digital video signals conforming to such a standardized data format include a high-definition digital video signal (HD signal), a 4: 2: 2 component digital video signal (D1 signal), and a 4fsc composite digital video signal (D2 signal). ) Etc. are known.

[0006] Taking the HD signal out of these, the HD signal follows a data format as shown in FIG. 25, for example.

The data format shown in FIG.
A luminance signal data sequence (Y data sequence) representing a luminance signal component in a video signal as shown in FIG. 25A and color difference signal data representing a color difference signal component in the video signal as shown in FIG. 25B. Series (P _B
/ P _R data series), Y data series and P _B
/ Each word data forming each of the P _R data sequence is a 10-bit configuration. That is, each of the Y data sequence and P _B / P _R data sequence is a 10-bit quantized digital signal. FIG. 25A shows a line blanking period in each line period in the Y data series and a portion corresponding to a part of the video data period before and after the line blanking period. FIG. , P _B /
It has been shown a portion corresponding to a portion of the video data period of the horizontal blanking period and before and after in each line period in the P _R data series.

In the Y data series, immediately before the portion corresponding to each video data period, four words (3FF (Y), 000 (Y), 000) each having a 10-bit configuration.
(Y), XYZ (Y)) are provided, and four words each having a 10-bit structure are provided immediately after a portion corresponding to each video data period. (3FF
(Y), 000 (Y), 000 (Y), XYZ (Y))
Timing reference code data (EAV: Endo
f Active Video). Similarly, P _B / P _R
Even in the data sequence, immediately before the portion corresponding to each video data period, four words each having a 10-bit configuration (3FF (C), 000 (C), 000 (C), XYZ
(C)), and immediately after the portion corresponding to each video data period, four words (3FF (C), 000 (C),
000 (C), XYZ (C)). Of course, EAV and SAV Each of the in Y data sequence, Y data is arranged in a portion corresponding to the line blanking period in the sequence, also people P _B / P _R data in the sequence of the EAV and SAV husband, P disposed in a portion corresponding to the line blanking period in _B / P _R data sequence.

3FF (Y), 3FF (C), 000
(Y) and 000 (C) are fixed value information displayed in hexadecimal. XYZ (Y) and XYZ (C) are variable value information displayed in hexadecimal. Identification of ranking period and SAV and EA
V indicates the identification.

[0010] In such Y data sequence and P _B / P _R data sequence is transmitted, Y data sequence and P _B /
The P _R data sequence, word multiplexing process at Moto the portion corresponding to the line blanking period, each of EAV and SAV are disposed has been made to the synchronization is performed, the word multiple data series as shown in FIG. 26 , Formed as a 10-bit quantized digital signal. Then, the digital video signal converted into a 10-bit quantized digital signal according to the word multiplexed data sequence is, for example, standardized H
D serial digital interface (HDSDI:
High Definition Serial Digital Interface) and transmitted to be converted into serial digital data and transmitted.

In the word multiplexed data sequence, immediately before a portion corresponding to each video data period, 8 words (3FF (C), 3FF
(Y), 000 (C), 000 (Y), 000 (C),
000 (Y), XYZ (C), XYZ (Y)), and a 10-bit structure immediately after a portion corresponding to each video data period. 8 words (3FF
(C), 3FF (Y), 000 (C), 000 (Y),
000 (C), 000 (Y), XYZ (C), XYZ
(Y)) is provided.

Further, is one D1 signal of the digital video signal, C _B, which is the Y data sequence which is a 10-bit word sequence data representing the luminance signal component, a 10-bit word sequence data representing the color difference signal components The / _CR data sequence is subjected to word multiplexing processing, and a predetermined portion of the resulting word multiplexed data sequence is obtained by being replaced by SAV and EAV. SAV and EAV play the role of word synchronization data.

The D1 signal takes the form of 10-bit word string data, and is formed, for example, by digital data according to a data format as shown in FIG. FIG. 27 shows a line blanking period in each line period of the D1 signal and a portion corresponding to a part of the video data period before and after the line blanking period. In such a portion, immediately before the portion corresponding to each video data period, a SAV composed of 4 words (3FF, 000,000, XYZ) each having a 10-bit configuration is arranged, and each video data period is provided. Immediately after the portion corresponding to the four words (3 words each having a 10-bit configuration).
FF, 000,000,000,000, XYZ). 3FF and 000 are fixed value information displayed in hexadecimal, and XYZ are variable value information displayed in hexadecimal, and identify field, identify field blanking period, and identify SAV and EAV. Show.

When the D1 signal is transmitted, the D1 signal is transmitted, for example, after being converted into serial digital data according to the standardized SDI and transmitted.

Then, such an HD signal or D1
When simultaneous transmission of a plurality of digital video signals and a plurality of optical signals based on digital information signals such as digital audio signals is required, a plurality of digital video signals and digital information signals may be transmitted. Serial digital data based on each is formed, and each of the serial digital data is converted into an optical signal. Then, a plurality of optical signals obtained as a result are transmitted through an optical signal transmission cable formed by, for example, an optical fiber. At this time, each of the plurality of optical signals has a center wavelength selected according to the characteristics of the optical fiber constituting the optical signal transmission cable.

There are various types of optical fibers, and one of them is a quartz single mode fiber (silica SMF). This quartz-based SMF has, for example, a core diameter of 10 μm, a cladding diameter of 125 μm, and a single propagation mode, a wide transmission frequency band, and low propagation loss. Therefore, it is suitable for high-speed, long-distance communication using optical signals, and is suitable for transmitting optical signals based on digital video signals such as HD signals obtained from a video camera.

Such a quartz SMF is, for example, shown in FIG.
The optical signal is attenuated according to the attenuation characteristic shown in FIG. 8, and the optical signal is dispersed according to the dispersion characteristic shown in FIG. The dispersion of an optical signal refers to the spread of the frequency spectrum of the optical signal and the spread of the propagation time or waveform distortion of the optical signal caused by the material and structure of the optical fiber.
In the attenuation characteristic shown in FIG. 28, the wavelength is set to approximately 1.3.
It shows the minimum value of attenuation for light having a wavelength of μm and light having a wavelength of approximately 1.55 μm. Further, in the dispersion characteristics shown in FIG. 29, the dispersion of light having a wavelength of about 1.3 μm is minimized.

Under these circumstances, for example, quartz-based SMF
The optical signal transmitted through the optical transmission line constituted by the above-mentioned formula (1) is selected such that the center wavelength is such that the attenuation is small in the attenuation characteristic shown in FIG. 28 of the quartz-based SMF. For example, when transmitting an HD signal obtained from a video camera, when converting serial digital data based on the HD signal obtained from the video camera into an optical signal,
A 1.3 μm band light source is used and the center wavelength is set to approximately 1.3 μm.
m, or 1.55
A state in which an optical signal having a center wavelength of about 1.55 μm is formed by using a light source in the μm band is established.

[0019]

As described above, simultaneous transmission of a plurality of optical signals based on digital information signals such as a plurality of digital video signals and digital audio signals, for example, HD signals or D1 signals, is performed. Is required, a plurality of serial digital data based on a plurality of digital video signals and digital information signals are formed, and each of the serial digital data is converted into an optical signal and transmitted to an optical signal transmission cable. You. At this time, according to the conventional method, even if a part of a plurality of serial digital data to be transmitted is multiplexed, a plurality of optical signal transmission cables for transmitting a plurality of optical signals are arranged in parallel. Therefore, a large space for installing the optical signal transmission cable is required, and the cost is increased.

Therefore, for example, transmission of a plurality of optical signals obtained by converting each of a plurality of serial digital data based on a plurality of digital video signals and digital information signals through an optical signal transmission cable is performed by installing an optical signal. In order to minimize the number of transmission cables, an efficient optical signal transmission system is desired.
Conventionally, such an optical signal transmission system has not been found.

In view of the above, the invention described in the claims of the present application can transmit a plurality of optical signals based on a plurality of serial digital data through a common optical signal transmission cable, and For example, when applied to the simultaneous transmission of a plurality of optical signals obtained by converting a plurality of serial digital data based on digital information signals such as a plurality of digital video signals and digital audio signals through an optical signal transmission cable. In order to minimize the number of installed optical signal transmission cables, an optical signal transmission method capable of performing the simultaneous transmission efficiently and an optical signal transmission device provided for carrying out such a method. provide.

[0022]

An optical signal transmission method according to any one of the first to eleventh aspects of the present invention provides a method for transmitting first serial digital data to a first serial digital data. Converting the first serial digital data into a second optical signal having a second central wavelength different from the first central wavelength, further converting the second serial digital data into a second optical signal having a second central wavelength different from the first central wavelength; The digital data is converted into a third optical signal having a third central wavelength different from each of the first and second central wavelengths, and the first, second, and third optical signals are converted.
A multiplexing process is performed on two of the optical signals to form a first multiplexed optical signal, and the first multiplexed optical signal and the first, second, and third optical signals are formed. The other one of the signals is subjected to multiplexing processing using multiplexing means to form a second multiplexed optical signal, and the second multiplexed optical signal is transmitted to an optical signal transmission cable to be transmitted. It is transmitted through an optical signal transmission cable.

For the first, second and third center wavelengths, for example, as in the optical signal transmission method according to the third aspect of the present invention, the first center wavelength is the second center wavelength. The first center wavelength is set to be longer than the third center wavelength, or the first center wavelength is set to the third center wavelength, as in the optical signal transmission method according to the present invention. A state setting is made such that the third center wavelength is longer than the wavelength and the third center wavelength is longer than the second center wavelength.

In the optical signal transmission method according to any one of the twelfth to twenty-first aspects of the present invention, a plurality of first serial digital data are subjected to multiplexing / combining processing. To form a composite serial data, convert the composite serial data into a first optical signal having a first center wavelength, and multiplex the plurality of second serial digital data to form a first multiplexed serial data. And converts it into a second optical signal having a second center wavelength different from the first center wavelength, and multiplexes the plurality of third serial digital data to obtain a second multiplexed serial data. And converting it into a third optical signal having a third center wavelength different from each of the first and second center wavelengths, and converting among the first, second and third optical signals The two are subjected to multiplexing processing using multiplexing means to form a first multiplexed optical signal, and the remaining of the first multiplexed optical signal and the first, second, and third optical signals. One is subjected to multiplexing processing using multiplexing means to form a second multiplexed optical signal, and the second multiplexed optical signal is transmitted to the optical signal transmission cable and transmitted through the optical signal transmission cable. It shall be.

For the first, second and third center wavelengths, for example, as in the optical signal transmission method according to the present invention, the first center wavelength is the second center wavelength. The state setting is longer and the second center wavelength is longer than the third center wavelength, or the first center wavelength is set to the third center wavelength as in the optical signal transmission method according to the invention described in claim 19. A state setting is made such that the third center wavelength is longer than the wavelength and the third center wavelength is longer than the second center wavelength.

Further, the optical signal transmission apparatus according to any one of claims 22 to 27 in the claims of the present application has the first serial digital data having the first center wavelength. A first light-to-light conversion unit for converting to a first light signal, and a second light-to-light conversion unit for converting the second serial digital data into a second light signal having a second center wavelength different from the first center wavelength. A converter, a third electro-optical converter that converts the third serial digital data into a third optical signal having a third central wavelength different from each of the first and second central wavelengths, A first multiplexing unit that performs a multiplexing process on two of the second and third optical signals to obtain a first multiplexed optical signal, and a first multiplexed optical signal and first and second multiplexed optical signals.
And a second multiplexing device that performs a multiplexing process on the remaining one of the third optical signals to obtain a second multiplexed optical signal, and sends the second multiplexed optical signal to the optical signal transmission cable. And a unit.

In the first, second and third electro-optical converters, the first, second and third center wavelengths are
For example, as in the optical signal transmission device according to the invention described in claim 24, a state setting in which the first center wavelength is longer than the second center wavelength and the second center wavelength is longer than the third center wavelength. Or a state in which the first center wavelength is longer than the third center wavelength and the third center wavelength is longer than the second center wavelength, as in the optical signal transmission device according to the invention described in claim 26. The settings are made.

An optical signal transmission apparatus according to any one of claims 28 to 33 in the claims of the present application performs a multiplexing / combining process on a plurality of first serial digital data. A data multiplexing / synthesizing unit for forming composite serial data, a first electro-optical conversion unit for converting the composite serial data into a first optical signal having a first center wavelength, and a multiplexing unit for multiplexing the plurality of second serial digital data. A first data multiplexing unit for performing first processing to form first multiplexed serial data, and converting the first multiplexed serial data to a second optical signal having a second center wavelength different from the first center wavelength. A second light-to-light conversion unit for converting,
Multiplexing the serial digital data of
A second data multiplexing unit for forming the multiplexed serial data, and the second multiplexed serial data is converted into a third optical signal having a third central wavelength different from each of the first and second central wavelengths. A third light-to-light conversion unit, first, second, and third
A first multiplexing unit that performs a multiplexing process on two of the optical signals to form a first multiplexed optical signal, a first multiplexed optical signal, and first, second, and third optical signals A second multiplexing unit for performing a multiplexing process on the remaining one of them to form a second multiplexed optical signal and transmitting the second multiplexed optical signal to the optical signal transmission cable. Be composed.

Then, in the first, second and third electro-optical converters, the first, second and third center wavelengths are
For example, as in the optical signal transmission device according to the invention described in claim 30, a state setting in which the first center wavelength is longer than the second center wavelength and the second center wavelength is longer than the third center wavelength. Or a state where the first center wavelength is longer than the third center wavelength and the third center wavelength is longer than the second center wavelength, as in the optical signal transmission device according to the invention described in claim 32. The settings are made.

The optical signal transmission method according to any one of the first to eleventh aspects of the present invention as described above, or the twenty-second to twenty-second aspects of the present invention. 27, the first, second, and third serial digital data are different from each other in the first, second, and third center wavelengths, respectively. Are converted into first, second, and third optical signals having the following structure. Further, the first, second, and third optical signals are multiplexed to form a multiplexed optical signal. Transmitted through cable.

Such an optical signal transmission cable through which a multiplexed optical signal is transmitted substantially comprises first and second optical signals.
And the third optical signal. Therefore, simultaneous transmission of a plurality of optical signals based on a plurality of serial digital data is efficiently performed in order to minimize the number of installed optical signal transmission cables.

Further, as described above, the optical signal transmission method according to any one of claims 12 to 21 in the claims of the present application, or the optical signal transmission method according to claim 28 in the claims of the present application. In the optical signal transmission apparatus according to any one of the above aspects, the composite serial data based on the plurality of first serial digital data and the first serial data based on the plurality of second serial digital data may be used. Multiple serial data and multiple thirds
The second multiplexed serial data is formed based on the serial digital data of
The first multiplex serial data and the second multiplex serial data are converted into first, second, and third optical signals having first, second, and third center wavelengths different from each other, respectively. The first, second, and third optical signals are multiplexed to form a multiplexed optical signal, and the multiplexed optical signal is transmitted through an optical signal transmission cable.

Such an optical signal transmission cable through which a multiplexed optical signal is transmitted is also substantially equivalent to the first and second optical signal transmission cables.
And the third optical signal. Therefore, simultaneous transmission of a plurality of optical signals based on the plurality of first serial digital data, the plurality of second serial digital data, and the plurality of third serial digital data minimizes the number of installed optical signal transmission cables. It will be performed efficiently in order to keep the limit.

An optical signal transmission method or an optical signal transmission device according to the invention described in the claims of the present application is:
For example, when applied to the simultaneous transmission of a plurality of optical signals based on digital information signals such as a plurality of digital video signals and digital audio signals as HD signals or D1 signals, a plurality of serial digital data or a plurality of The first serial digital data, the plurality of second serial digital data, and the plurality of third serial digital data are digital information signals such as a plurality of digital video signals and digital audio signals which are HD signals or D1 signals. It shall be obtained by serialization. Thereby, for example, simultaneous transmission of a plurality of optical signals based on digital information signals such as a plurality of digital video signals and digital audio signals as HD signals or D1 signals is efficiently performed through one optical signal transmission cable. Will be.

[0035]

FIG. 1 shows an example of an optical signal transmission method according to the present invention described in any one of claims 1 to 6 and claim 11 of the present application. An example of an optical signal transmitting / receiving apparatus to which an example of the optical signal transmitting apparatus according to any one of claims 22 to 25 in the claims of the present application is applied.

The optical signal transmission / reception device shown in FIG. 1 is provided between a CCU-side transmission unit 11 which is a transmission unit in a camera control unit (CCU) to which a video signal is supplied from a video camera and a CCU. For example, a plurality of serial digital data is transmitted to a relay unit side receiving unit 12 which is a receiving unit in a relay unit which is mounted on a vehicle, and transmits and receives various signals.

In the optical signal transmitting / receiving apparatus shown in FIG. 1, the CCU side transmitting section 11 supplies the serial digital data DVA and DVB to the electro-optical converting sections (E / O converting sections) 13 and 14, respectively. You. Each of the serial digital data DVA and DVB is, for example, a serial HD signal obtained by serializing an HD signal, and has a bit transmission rate of, for example, 1.485 Gbps.
It is assumed that.

In the CCU-side transmitting section 11, serial digital data DAA and DAB different from the serial digital data DVA and DVB are supplied to the data multiplexing section 15. Serial digital data DA
Each of A and DAB is assumed to form a serial digital audio signal, for example.

The E / O converter 13 performs a light-to-light conversion process on the serial digital data DVA, and sets the center wavelength based on the serial digital data DVA to approximately 1.55.
An optical signal OVA of μm is obtained.

The E / O converter 13 includes, for example, a laser driver 16 and a 1.55 μm band distributed feedback (DFB) laser diode 17 as shown in FIG. Then, the serial digital data DVA is supplied to the laser driving unit 16, and the laser driving signal S corresponding to the serial digital data DVA is supplied from the laser driving unit 16.
An LDA is obtained and supplied to the DFB laser diode 17 in the 1.55 μm band.

1.55 μm band DFB laser diode 1
7 oscillates in a single-wavelength mode and emits a laser beam having a center wavelength of about 1.55 μm, for example, as shown in FIG.
It is about. 1. The laser drive signal SLDA is supplied.
The 55 μm band DFB laser diode 17 emits a 1.55 μm band laser beam having a center wavelength of approximately 1.55 μm in a state modulated by the laser drive signal SLDA. Center wavelength is approximately 1.55μ based on digital data DVA
m, the bit transmission rate is 1.48.
It is obtained under the condition of 5 Gbps. This optical signal OVA
Is supplied to the multiplexing unit 18.

The E / O converter 14 performs an electro-optical conversion process on the serial digital data DVB to obtain an optical signal OVB having a center wavelength of about 1.3 μm based on the serial digital data DVB.

The E / O converter 14 includes, for example, a laser driver 19 and a 1.3 μm-band Fabry-Perot (FP) laser diode 20, as shown in FIG. Then, the serial digital data DVB is
The laser drive signal 19 is supplied to the laser drive unit 19, and a laser drive signal SLDB corresponding to the serial digital data DVB is obtained from the laser drive unit 19, and is supplied to the 1.3 μm band FP laser diode 20.

1.3 μm band FP laser diode 20
Oscillates in a multi-wavelength mode and emits a laser beam having a wavelength spectrum of about 8 nm with a center wavelength of about 1.3 μm as shown in FIG. 5, for example. For example, it is about 0.4 nm / ° C. The 1.3-μm band FP laser diode 20 supplied with the laser drive signal SLDB has a center wavelength of approximately 1.3 μm.
The laser light in the 3 μm band is emitted in a state modulated by the laser drive signal SLDB, whereby the optical signal OVB having a center wavelength of approximately 1.3 μm based on the serial digital data DVB is output from the E / O converter 14. , And the bit transmission rate is 1.485 Gbps. This optical signal OVB is also supplied to the multiplexing unit 18.

The multiplexing section 18 is formed by a directional coupler type or a dielectric multilayer type wavelength multiplex coupler (directional coupling type or dielectric multilayer type WDM coupler) or the like. For example, the multiplexing unit 18 formed by the directional coupler type WDM coupler is configured as an example is equivalently shown in FIG.

In the configuration shown in FIG. 6, an optical signal OVA having a center wavelength of approximately 1.55 μm from the E / O converter 13 is directionally coupled through an optical connector 21 and an optical fiber connected thereto. The optical signal OVB having a center wavelength of about 1.3 μm from the E / O conversion unit 14 is guided to the directional coupling unit 22 through the optical connector 23 and the optical fiber connected thereto while being guided to the unit 22. The directional coupling part 22 is a part where an optical fiber for guiding light through the optical connector 21 and an optical fiber for guiding light through the optical connector 23 are mutually coupled. In the directional coupler 22, the center wavelength is set to approximately 1.55 μm.
And an optical signal OVB having a center wavelength of approximately 1.3 μm are multiplexed and multiplexed, and a multiplexed optical signal OVM is transmitted. Then, the multiplexed optical signal OVM obtained in the directional coupler 22 is derived through an optical connector 24 connected to an optical fiber constituting the directional coupler 22.

In this way, the multiplexed optical signal OVM obtained from the multiplexing unit 18 is supplied to the multiplexing unit 25 at the next stage.

On the other hand, the data multiplexing section 15 performs a multiplexing process on the serial digital data DAA and the serial digital data DAB, and obtains the multiplexed serial data DAM which is the serial digital data obtained as a result.
For example, assuming that the bit transmission rate is several tens Mbps. The multiplexing process in the data multiplexing unit 15 is performed, for example, by serial / parallel (S / P) converting each of the serial digital data DAA and the serial digital data DAB into parallel digital data, performing a mapping process on them, and multiplexing. By forming parallel digital data and performing parallel / serial (P / S) conversion of the multiplexed parallel digital data, multiplexed serial data DAM is obtained.

The multiplexed serial data DAM sent from the data multiplexing unit 15 is supplied to an E / O conversion unit 26.
The E / O converter 26 is, for example, as shown in FIG.
The laser driver 27 and the FP laser diode 28 in the 0.83 μm band are provided. And the data multiplexing unit 1
5 is multiplexed serial data DAM from the laser driver 2
7, a laser drive signal SLDM corresponding to the multiplexed serial data DAM is obtained from the laser drive unit 27,
It is supplied to a 0.83 μm band FP laser diode 28.

0.83 μm band FP laser diode 28
Oscillates in a multi-wavelength mode, and emits a laser beam having a wavelength spectrum of about 8 nm with a center wavelength of about 0.83 μm as shown in FIG. 8, for example. The 0.83 μm band FP laser diode 28 to which the laser drive signal SLDM is supplied converts the 0.83 μm band laser light whose center wavelength is approximately 0.83 μm into the laser drive signal SLDM.
, With a state modulated by
An optical signal OAM having a center wavelength of about 0.83 μm based on the multiplexed serial data DAM is obtained from the O conversion unit 26,
It can be obtained with a bit transmission rate of several tens Mbps. This optical signal OAM is supplied to the multiplexing unit 25.

Since the multiplexing section 25 handles an optical signal over a wide wavelength band, the multiplexing section 25 is formed of, for example, a dielectric multilayer type WDM coupler or the like, and one example thereof is equivalently shown in FIG. Be composed.

In the configuration shown in FIG.
8 from the optical connector 29 through the optical connector 29.
The optical signal OAM having the center wavelength of about 0.83 μm from the E / O conversion unit 26 is guided by the optical fiber connected thereto to the dielectric multilayer film unit 30 and the optical signal OAM is connected to the dielectric multilayer unit 30 through the optical connector 31. It is guided to the dielectric multilayer part 30. In the dielectric multilayer part 30, the optical signal OVA having a center wavelength of about 1.55 μm and the optical signal OV having a center wavelength of about 1.3 μm are provided.
A multiplexed optical signal OVM obtained by multiplexing B with an optical signal OAM having a center wavelength of approximately 0.83 μm is multiplexed and multiplexed, and a multiplexed optical signal OVX is transmitted. Then, the multiplexed optical signal OVX obtained in the dielectric multilayer part 30 is derived from the dielectric multilayer part 30 through an optical fiber and further through an optical connector 32 connected thereto.

As described above, the multiplexed optical signal OVX derived from the multiplexing unit 25 is transmitted from the CCU-side transmitting unit 11 and is transmitted through the optical connector 34 connecting the CCU-side transmitting unit 11 and the optical signal transmission cable 33. Optical signal transmission cable 3
3 and is transmitted to the relay unit side receiving section 12 through the optical signal transmission cable 33. The optical signal transmission cable 33 is, for example, a quartz SM having an attenuation characteristic as shown in FIG. 28 and a dispersion characteristic as shown in FIG.
F is formed.

The multiplexed optical signal OVX transmitted through the optical signal transmission cable 33 is guided to the relay unit side receiving unit 12 through an optical connector 35 connecting the optical signal transmission cable 33 and the relay unit side receiving unit 12.

In the relay unit side receiving section 12, the multiplexed optical signal OVX through the optical connector 35 is converted into a demultiplexing section 36.
It is led to. The demultiplexing unit 36 is, for example, the multiplexing unit 2 described above.
5 is formed by using a dielectric multilayer type WDM coupler or the like similar to that used to form the light-emitting device 5, and an example thereof is configured as equivalently shown in FIG.

In the configuration shown in FIG. 10, the multiplexed optical signal OVX through the optical connector 35 is
Is guided to the dielectric multilayer part 38 by the optical fiber connected thereto. In the dielectric multilayer part 38, the multiplexed optical signal OVX through the optical connector 37
The multiplexed optical signal OVM obtained by multiplexing the optical signal OVA having the center wavelength of about 1.55 μm and the optical signal OVB having the center wavelength of about 1.3 μm, and the center wavelength in the multiplexed optical signal OVX are An optical signal OAM of about 0.83 μm is separated from each other. Then, the multiplexed optical signal OVM is led out of the dielectric multilayer film portion 38 through one of the pair of optical fibers and further through the optical connector 39 connected thereto, and the optical signal OAM is output from the pair of optical fibers. And through an optical connector 40 connected thereto.

The optical signal OVA whose center wavelength is approximately 1.55 μm reproduced by the demultiplexer 36 and the center wavelength is approximately 1.
The multiplexed optical signal OVM obtained by multiplexing the optical signal OVB having a size of 3 μm with the optical signal OVB is guided to the demultiplexer 41 in the next stage. The demultiplexing unit 41 is a directional coupler type or a dielectric multilayer type WDM.
It is formed by a coupler or the like. For example, when it is formed by a directional coupler type WDM coupler, an example thereof is configured as shown equivalently in FIG.

In the configuration shown in FIG. 11, the multiplexed optical signal OVM from the demultiplexer 36 is guided to the directional coupler 43 through the optical connector 42 and the optical fiber connected thereto. The directional coupling part 43 is connected to the optical connector 42.
This is the part where the optical fiber that guides the light through is split into two optical fibers. One of the two optical fibers forming the directional coupler 43 is a multiplexed optical signal O.
In the VM, an optical signal OVA having a center wavelength of about 1.55 μm and a bit transmission rate of 1.485 Gbps passes, and the other of the optical signals OVA in the multiplexed optical signal OVM is used.
The center wavelength is approximately 1.3 μm, and the bit transmission rate is 1.
It is assumed that an optical signal OVB of 485 Gbps passes. Then, the optical signal OVA is led out through the optical connector 44 connected to one of the two optical fibers forming the directional coupling section 43, and the optical signal OVA is output.
Is led out through an optical connector 45 connected to the other of the two optical fibers forming the directional coupling portion 43.

An optical signal OVA having a center wavelength of about 1.55 μm and an optical signal OVB having a center wavelength of about 1.3 μm, which are reproduced by the demultiplexing section 41, are converted by a photoelectric conversion section (O / E
(Conversion units) 46 and 47, respectively. In the O / E converter 46, an optical signal OVA having a center wavelength of approximately 1.55 μm and a bit transmission rate of 1.485 Gbps.
To a bit transmission rate of 1.4 based on an optical signal OVA having a center wavelength of about 1.55 μm.
The serial digital data DVA of 85 Gbps is reproduced. In the O / E converter 47, the center wavelength is set to approximately 1.3 μm, and the bit transmission rate is set to 1.485.
Gbps optical signal OVB is subjected to photoelectric conversion processing,
Based on an optical signal OVB having a center wavelength of about 1.3 μm,
The serial digital data DVB whose bit transmission rate is 1.485 Gbps is reproduced. The serial digital data DVA and DVB reproduced in this manner are
Is transmitted from the relay unit side receiving section 12.

The optical signal OAM having the center wavelength of about 0.83 μm reproduced by the demultiplexer 36 is supplied to the O / E converter 48. The O / E converter 48 performs a photoelectric conversion process on an optical signal OAM having a center wavelength of about 0.83 μm and a bit transmission rate of several tens of Mbps,
A multiplex serial data DAM having a bit transmission rate of several tens of Mbps based on an optical signal OAM having a center wavelength of about 0.83 μm is reproduced. The multiplexed serial data DAM obtained from the O / E converter 48 is supplied to a data separator 49.

The data separation section 49 performs a separation process on the multiplexed serial data DAM, and reproduces two digital data obtained as a result, serial digital data DAA and serial digital data DAB. The serial digital data DAA and DAB reproduced in this manner are transmitted from the relay unit side receiving section 12. The separation processing in the data separation unit 49 includes, for example,
The multiplexed serial data DAMA is S / P converted to parallel digital data once, subjected to demapping processing and divided into two parallel digital data, and each of the two parallel digital data is subjected to P / S conversion. It is assumed that serial digital data DAA and DAB are obtained.

In the example of the optical signal transmitting apparatus applied to the optical signal transmitting / receiving apparatus shown in FIG. 1 or the example of the optical signal transmitting method implemented in the apparatus, each of the serial digital data DVA and DVB is provided. , For example, a serial HD signal, and serial digital data D
Each of the AA and the DAB is assumed to form, for example, a serial digital audio signal. Therefore, for example, a plurality of optical video signals based on a plurality of digital video signals and a plurality of digital audio signals, which are HD signals, are provided. Simultaneous transmission is performed by one optical signal transmission cable 33
Will be carried out efficiently.

FIG. 12 shows an example of an optical signal transmission method according to any one of the first to fifth, seventh, and eleventh aspects of the present invention. Claim 2 in the claims of the present application
An example of an optical signal transmitting / receiving apparatus to which another example of the optical signal transmitting apparatus according to any one of claims 2 to 25 is applied will be described.

The optical signal transmitting / receiving apparatus shown in FIG. 12 transmits / receives various signals to / from a CCU from a CCU-side transmitting section 51 which is a transmitting section in a CCU to which a video signal from a video camera is supplied. A plurality of serial digital data are transmitted to a relay unit-side receiving section 52 which is a receiving section of a relay unit to be mounted on a vehicle.

In the optical signal transmitting / receiving apparatus shown in FIG. 12, the CCU side transmitting section 51 supplies serial digital data DVA and DVB to the E / O converting sections 53 and 54, respectively. Serial digital data D
Each of VA and DVB is, for example, a serial HD signal and has a bit transmission rate of, for example, 1.485 Gb.
ps.

In the CCU-side transmitting section 51, serial digital data DAA and DAB different from the serial digital data DVA and DVB are supplied to the data multiplexing section 55. Serial digital data DA
Each of A and DAB is assumed to form a serial digital audio signal, for example.

The E / O converters 53 and 54 are respectively provided in FIG.
E / O converter 1 in CCU-side transmitter 11 shown in FIG.
It is configured similarly to 3 and 14. The E / O converter 53 performs an electro-optical conversion process on the serial digital data DVA, sets the center wavelength based on the serial digital data DVA to approximately 1.55 μm, and sets the bit transmission rate to 1.
An optical signal OVA of 485 Gbps is obtained. Also, E /
In the O conversion section 54, the serial digital data D
The VB is subjected to electro-optical conversion to obtain an optical signal OVB having a center wavelength based on the serial digital data DVB of approximately 1.3 μm and a bit transmission rate of 1.485 Gbps. Then, the optical signal OV obtained from the E / O conversion unit 53
A is supplied to the multiplexing unit 56, and the optical signal OVB obtained from the E / O conversion unit 54 is supplied to the multiplexing unit 57.

On the other hand, the data multiplexing section 55 is configured in the same manner as the data multiplexing section 15 in the CCU-side transmitting section 11 shown in FIG. 1, and the data multiplexing section 15 outputs serial digital data DAA and serial digital data DAB. Multiplexed serial data DAM formed by multiplexing is transmitted and supplied to the E / O converter 58.
The E / O conversion unit 58 is a CCU-side transmission unit 1 shown in FIG.
1 has the same configuration as the E / O conversion unit 26 in
The conversion unit 58 performs an electro-optical conversion process on the multiplexed serial data DAM to obtain an optical signal OAM having a center wavelength based on the multiplexed serial data DAM of about 0.83 μm and a bit transmission rate of several tens of Mbps. And E / O
The optical signal OAM obtained from the conversion unit 58 is supplied to the multiplexing unit 57.

The multiplexing section 57 is formed by a directional coupler type or a dielectric multilayer type WDM coupler or the like.
For example, the multiplexing section 57 formed by a directional coupler-type WDM coupler is configured as an example is equivalently shown in FIG.

In the configuration shown in FIG. 13, E / O
An optical signal OVB having a center wavelength from the conversion unit 54 of approximately 1.3 μm and a bit transmission rate of 1.485 Gbps.
Is guided to the directional coupling portion 61 through the optical connector 60 by the optical fiber connected thereto, and E
The center wavelength from the / O conversion unit 58 is approximately 0.83 μm,
Optical signal OAM with bit transmission rate of tens of Mbps
Is guided to the directional coupling portion 61 through the optical connector 62 and the optical fiber connected thereto. The directional coupling portion 61 is a portion where an optical fiber for guiding light through the optical connector 60 and an optical fiber for guiding light through the optical connector 62 are mutually coupled. In the directional coupler 61, the optical signal OVB having a center wavelength of about 1.3 μm
And an optical signal OAM having a center wavelength of about 0.83 μm, which is multiplexed and multiplexed, and a multiplexed optical signal OQM is transmitted. The multiplexed optical signal OQM obtained in the directional coupler 61
Is led out through an optical connector 63 connected to an optical fiber constituting the directional coupling portion 61.

In this way, the multiplexed optical signal OQM obtained from the multiplexing unit 57 is supplied to the multiplexing unit 56.

Since the multiplexing section 56 handles an optical signal over a wide wavelength band, the multiplexing section 56 is formed of, for example, a dielectric multilayer type WDM coupler or the like, and an example thereof is as shown equivalently in FIG. Be composed.

In the configuration shown in FIG. 14, E / O
An optical signal OVA having a center wavelength from the converter 53 of about 1.55 μm and a bit transmission rate of 1.485 Gbps.
Is guided to the dielectric multilayer part 66 through the optical connector 65 by the optical fiber connected thereto,
An optical signal OVB having a center wavelength of about 1.3 μm from the multiplexing unit 57 and an optical signal OAM having a center wavelength of about 0.83 μm
Are multiplexed, and the multiplexed optical signal OQM obtained is guided through the optical connector 67 to the dielectric multilayer film section 66 by the optical fiber connected thereto. In the dielectric multilayer 66, an optical signal OV having a center wavelength of about 1.55 μm is used.
A, and an optical signal OVB having a center wavelength of about 1.3 μm
A multiplexed optical signal OQM obtained by multiplexing the optical signal OAM having a center wavelength of about 0.83 μm with the multiplexed optical signal OQM is transmitted, and a multiplexed optical signal OQX is transmitted. Then, the multiplexed optical signal OQX obtained in the dielectric multilayer part 66 is led out from the dielectric multilayer part 66 through an optical fiber and further through an optical connector 68 connected thereto.

As described above, the multiplexed optical signal OQX derived from the multiplexing unit 56 is transmitted from the CCU-side transmitting unit 51, and is transmitted through the optical connector 71 connecting the CCU-side transmitting unit 51 and the optical signal transmission cable 70. Optical signal transmission cable 7
0, and is transmitted to the relay unit side receiving section 12 side through the optical signal transmission cable 70. The optical signal transmission cable 70 is, for example, a quartz-based SM having an attenuation characteristic as shown in FIG. 28 and a dispersion characteristic as shown in FIG.
F is formed.

The multiplexed optical signal OQX transmitted through the optical signal transmission cable 70 is guided to the relay unit side receiving section 52 through the optical connector 72 connecting the optical signal transmission cable 70 and the relay unit side receiving section 52.

In the relay unit side receiving section 52, the multiplexed optical signal OQX through the optical connector 72 is transmitted to the branching section 74.
It is led to. The demultiplexing unit 74 includes, for example, the multiplexing unit 5 described above.
6 is formed by using a dielectric multilayer type WDM coupler or the like similar to that used to form the optical element 6, and an example thereof is configured as shown equivalently in FIG.

In the configuration shown in FIG. 15, the multiplexed optical signal OQX through the optical connector 72 is
Through the optical fiber and is guided to the dielectric multilayer part 76 by an optical fiber connected thereto. In the dielectric multilayer part 76, the multiplexed optical signal OQX through the optical connector 75
An optical signal OVA having a center wavelength of approximately 1.55 μm and a bit transmission rate of 1.485 Gbps, and an optical signal OV having a center wavelength of approximately 1.3 μm in the multiplexed optical signal OQX.
B and the multiplexed optical signal OQM obtained by multiplexing the optical signal OAM having the center wavelength of about 0.83 μm are separated from each other. The optical signal OVA is output from the dielectric multilayer 76.
Through one of the pair of optical fibers,
The multiplexed optical signal OQM is led out through the optical connector 77 connected thereto and the multiplexed optical signal OQM is led out through the other one of the pair of optical fibers and further through the optical connector 78 connected thereto.

The center wavelength reproduced by the demultiplexer 74 is approximately 1.55 μm, and the bit transmission rate is 1.485 Gb.
The optical signal OVA of ps is supplied to the O / E converter 80. In the O / E converter 80, the center wavelength is set to approximately 1.
55 μm, bit transmission rate 1.485 Gbps
Is subjected to photoelectric conversion processing to reproduce serial digital data DVA having a bit transmission rate of 1.485 Gbps based on the optical signal OVA having a center wavelength of about 1.55 μm.

A multiplexed light obtained by multiplexing an optical signal OVB having a center wavelength of about 1.3 μm and an optical signal OAM having a center wavelength of about 0.83 μm, which is reproduced by the demultiplexing section 74. The signal OQM is guided to the next-stage branching unit 81.
The demultiplexing unit 81 is formed by a directional coupler type or a dielectric multilayer type WDM coupler or the like. For example, in the case of being formed by a directional coupler type WDM coupler,
One example is configured as shown in FIG.

In the configuration shown in FIG. 16, the multiplexed optical signal OQM from the demultiplexing unit 74 is guided to the directional coupling unit 83 through the optical connector 82 and the optical fiber connected thereto. The directional coupling unit 83 includes an optical connector 82
This is the part where the optical fiber that guides the light through is split into two optical fibers. One of the two optical fibers forming the directional coupler 83 is a multiplexed optical signal O.
In the QM, an optical signal OVB having a center wavelength of about 1.3 μm and a bit transmission rate of 1.485 Gbps passes,
The other of the multiplexed optical signals OQM has a center wavelength of about 0.83 μm and a bit transmission rate of several tens M
It is assumed that an optical signal OAM of bps passes. Then, the optical signal OVB is supplied to the optical connector 8 connected to one of the two optical fibers forming the directional coupling portion 83.
4 and the optical signal OAM is output through an optical connector 85 connected to the other of the two optical fibers forming the directional coupler 83.

The center wavelength reproduced by the demultiplexer 81 is approximately 1.3 μm, and the bit transmission rate is 1.485 Gb.
optical signal OVB and the center wavelength are approximately 0.83
The optical signal OAM having a bit transmission rate of several tens of Mbps is supplied to O / E converters 86 and 87, respectively. In the O / E converter 86, the center wavelength is set to approximately 1.3.
μm and optical digital signal OVB having a bit transmission rate of 1.485 Mbps is subjected to photoelectric conversion processing, and based on the optical signal OVB having a center wavelength of approximately 1.3 μm, serial digital data having a bit transmission rate of 1.485 Gbps Play DVB. In the O / E conversion unit 87, the optical signal OAM having a center wavelength of about 0.83 μm and a bit transmission rate of several tens of Mbps is subjected to photoelectric conversion processing to set the center wavelength to about 0.83 μm. Optical signal OAM
Multiplexed serial data DAM with a bit transmission rate of several tens of Mbps based on the multiplexed serial data DAM. The multiplexed serial data DAM obtained from the O / E converter 87 is supplied to a data separator 88.

The data separating section 88 is configured similarly to the data separating section 49 in the relay unit side receiving section 12 shown in FIG. 1, and in the data separating section 88, performs a separating process on the multiplexed serial data DAM. Then, two digital data DAA and DAB obtained as a result are reproduced.

The serial digital data DVA, DVB, DAA and DAB reproduced as described above are transmitted from the relay unit side receiving section 52.

In the example of the optical signal transmission apparatus applied to the optical signal transmitting / receiving apparatus shown in FIG. 12 or the example of the optical signal transmission method implemented in the optical signal transmission / reception apparatus, each of the serial digital data DVA and DVB is provided. , For example, a serial HD signal, and each of the serial digital data DAA and DAB is, for example, a serial digital audio signal. The simultaneous transmission of a plurality of optical signals based on signals and a plurality of digital audio signals is performed by using one optical signal transmission cable 70.
Will be carried out efficiently.

FIG. 17 shows an example of an optical signal transmission method according to any one of the twelfth to seventeenth aspects of the present invention. An example of an optical signal transmitting / receiving apparatus to which an example of the optical signal transmission apparatus according to any one of claims 28 to 31 is applied will be described.

The optical signal transmitting / receiving apparatus shown in FIG. 17 transmits / receives various signals to / from a CCU from a CCU side transmitting section 91 which is a transmitting section in a CCU to which a video signal is supplied from a video camera. A plurality of serial digital data are transmitted to a relay unit-side receiving unit 92 which is a receiving unit of a relay unit to be mounted on a vehicle.

In the optical signal transmitting / receiving apparatus shown in FIG. 17, in the CCU side transmitting section 91, two systems of serial digital data DVA and DVB are supplied to a bit multiplexing section 93, and six systems of serial digital data are transmitted. DSA to DSF are supplied to a data multiplexing unit 94, and two systems of serial digital data DAA and DA
B is supplied to the data multiplexing unit 95.

Two-system serial digital data DVA
And DVB, for example, are serial HD signals obtained by serializing HD signals, and have a bit transmission rate of, for example, 1.485 Gbps. In addition, six systems of serial digital data DSA ~
Each of the DSFs is, for example, an SDI signal obtained by serializing the D1 signal, and has a bit transmission rate of, for example, 270 Mbps. In addition, 2
Each of the serial digital data DAA and DAB of the system forms, for example, a serial digital audio signal.

The bit multiplexing section 93 is constituted by using, for example, a 2-bit multiplexer, and performs an operation of alternately taking out one bit from each of the serial digital data DVA and DVB, thereby obtaining the serial digital data DV.
A and DVB are subjected to bit multiplexing / combining processing, and the bit transmission rate is set to 1.485 Gbps × 2 = 2.97 Gbps.
Is formed. Thus, the composite serial data DVM obtained from the bit multiplexing unit 93 is supplied to the E / O conversion unit 96.

E / O conversion section 96 is provided with the CC shown in FIG.
The configuration is the same as that of the E / O conversion unit 13 in the U-side transmission unit 11, and the composite serial data DV
M is subjected to electro-optical conversion processing to form an optical signal OVM based on the composite serial data DVM, for example, having a center wavelength of about 1.55 μ and a bit transmission rate of 2.97 Gbps. Optical signal OVM obtained from E / O conversion section 96
Is guided to the multiplexing unit 97.

The data multiplexing unit 94 has a specific configuration as shown in FIG. 18, for example. In the specific configuration example of the data multiplexing unit 94 shown in FIG. 18, six serial digital data DSA to DSF each having a bit transmission rate of 270 Mbps are supplied to the S / P conversion units 101 to 106, respectively. You. S / P converter 1
01 to 106, the serial digital data D
Each of SA to DSF is subjected to S / P conversion to form parallel data DPA to DPF.
106, the parallel data DPA to DPF obtained respectively.
Is supplied to the data mapping unit 107.

In the data mapping unit 107, the parallel data DPA to DPF are subjected to a mapping process, for example, the multiplexed parallel data D which is a 20-bit word string data having a word transmission rate of 108 MBps.
PM is formed. The multiplexed parallel data DPM obtained from the data mapping unit 107 is
Is subjected to P / S conversion, and the bit transmission rate is
The multiplexed serial data is set to 8 MBps × 20 = 2.16 Gbps. Then, the P / S converter 108
Are transmitted from the data multiplexing unit 94.

In this way, the multiplexed serial data DSM having the bit transmission rate of 2.16 Gbps obtained from the data multiplexing unit 94 is supplied to the E / O conversion unit 110. E / O conversion section 110 is configured similarly to E / O conversion section 14 in CCU-side transmission section 11 shown in FIG.
Is subjected to electro-optical conversion processing to form an optical signal OSM based on the multiplexed serial data DSM, for example, having a center wavelength of about 1.3 μm and a bit transmission rate of 2.16 Gbps. Optical signal OSM obtained from E / O converter 110
Is guided to the multiplexing unit 97.

The multiplexing unit 97 is configured in the same manner as the multiplexing unit 18 in the CCU-side transmitting unit 11 shown in FIG. 1 by a directional coupler type or a dielectric multilayer type WDM coupler or the like. Therefore, the center wavelength from the E / O conversion unit 96 is set to approximately 1.55 μm, and the bit transmission rate is set to 2.97.
A multiplexed optical signal formed by multiplexing an optical signal OVM with Gbps and an optical signal OSM with a center wavelength from the E / O converter 110 of approximately 1.3 μm and a bit transmission rate of 2.16 Gbps. An ORM is derived. Then, the multiplexed optical signal ORM derived from the multiplexing unit 97 is supplied to the multiplexing unit 111 in the next stage.

On the other hand, the data multiplexing section 95 is configured in the same manner as the data multiplexing section 15 in the CCU side transmitting section 11 shown in FIG. 1, and in the data multiplexing section 95, the serial digital data DAA and the serial digital data DA
B is multiplexed, and the resulting serial digital data, multiplexed serial data DAM, is transmitted with a bit transmission rate of several tens Mbps, for example.

The multiplexed serial data DAM sent from the data multiplexing unit 95 is supplied to the E / O conversion unit 112. The E / O conversion unit 112 is configured similarly to the E / O conversion unit 26 in the CCU-side transmission unit 11 shown in FIG.
The multiplexed serial data DAM from the data multiplexing unit 95 is subjected to electro-optical conversion processing to form an optical signal OAM based on the composite serial data DAM, for example, having a center wavelength of about 0.83 μm and a bit transmission rate of several tens Mbps. . The optical signal OAM obtained from the E / O converter 112 is
The light is guided to the multiplexing unit 111.

The multiplexing section 111 is configured in the same manner as the multiplexing section 25 in the CCU-side transmitting section 11 shown in FIG. 1 by, for example, a dielectric multilayer type WDM coupler or the like. The center wavelength from the part 97 is approximately 1.55 μ
m and an optical signal OSM having a center wavelength of about 1.3 μm are multiplexed to obtain a multiplexed optical signal OR.
M and the center wavelength from the E / O conversion unit 112 are set to approximately 0.
A multiplexed optical signal ORX obtained by multiplexing the optical signal OAM of 83 μm is derived.

In this way, the multiplexed optical signal ORX derived from the multiplexing unit 111 is transmitted from the CCU-side transmitting unit 91, and is connected to the CCU-side transmitting unit 91 and the optical signal transmission cable 114.
The optical signal is transmitted to the optical signal transmission cable 114 through the optical connector 115 connecting the optical fiber and the optical signal to the relay unit side receiving section 92 through the optical signal transmission cable 114. The optical signal transmission cable 114 is formed using, for example, a quartz SMF having an attenuation characteristic as shown in FIG. 28 and a dispersion characteristic as shown in FIG.

The multiplexed optical signal ORX transmitted through the optical signal transmission cable 114 is transmitted to the optical connector 11 connecting the optical signal transmission cable 114 and the relay unit side receiving section 92.
Through 6, it is guided to the relay unit side receiving section 92.

In the relay unit side receiving section 92, the multiplexed optical signal ORX transmitted through the optical connector 116 is transmitted to the branching section 1
It is led to 17. The demultiplexing unit 117 is configured in the same manner as the demultiplexing unit 36 in the relay unit-side receiving unit 12 illustrated in FIG. 1 by, for example, a dielectric multilayer type WDM coupler or the like. And a multiplexed optical signal ORM obtained by multiplexing an optical signal OVM having a center wavelength of about 1.55 μm and an optical signal OSM having a center wavelength of about 1.3 μm. The center wavelength is about 0.83 μm, and the bit transmission rate is several tens Mb.
The optical signal OAM as ps is separated and derived.

A multiplexed optical signal ORM obtained by multiplexing an optical signal OVM having a center wavelength of about 1.55 μm and an optical signal OSM having a center wavelength of about 1.3 μm, reproduced by the demultiplexing section 117. Is guided to the branching unit 118 at the next stage.
The demultiplexing unit 118 is configured in the same manner as the demultiplexing unit 41 of the relay unit side receiving unit 12 shown in FIG. 1 by a directional coupler type or a dielectric multilayer type WDM coupler or the like. The center wavelength in the multiplexed optical signal ORM is set to approximately 1.55 μm, and the bit transmission rate is set to 2.97.
The optical signal OVM of Gbps and the optical signal OSM of the multiplexed optical signal ORM having a center wavelength of approximately 1.3 μm and a bit transmission rate of 2.16 Gbps are separated and derived.

The optical signal OVM having a center wavelength of about 1.55 μm and the optical signal OSM having a center wavelength of about 1.3 μm, which are reproduced by the demultiplexer 118, are combined with the O / E converter 119.
And 120 respectively. The O / E converter 119 performs a photoelectric conversion process on an optical signal OVM having a center wavelength of about 1.55 μm and a bit transmission rate of 2.97 Gbps, and a light having a center wavelength of about 1.55 μm. 2.97 Gbps bit transmission rate based on signal OVM
Is reproduced. Also, O
In the / E conversion unit 120, the center wavelength is approximately 1.3 μm
The optical signal OSM having a bit transmission rate of 2.16 Gbps is subjected to photoelectric conversion processing to set the center wavelength to approximately 1.3.
The multiplexed serial data DSM having a bit transmission rate of 2.16 Gbps based on the optical signal OSM of μm is reproduced.

The composite serial data DVM with a bit transmission rate of 2.97 Gbps obtained from the O / E converter 119 is supplied to the bit separator 121. The bit separation unit 121 is configured using, for example, a 2-bit demultiplexer, and sequentially takes out one bit from the composite serial data DVM and distributes it alternately, each of which has a bit transmission rate of 2.97 Gbps / 2 = 1. 485 Gbps
And the digital digital data DVA and the digital digital data DVB are individually reproduced.

The multiplexed serial data DSM with a bit transmission rate of 2.16 Gbps obtained from the O / E converter 120 is supplied to the data separator 122. The data separation unit 122 has, for example, a specific configuration as shown in FIG.

In the specific configuration example of the data separation section 122 shown in FIG. 19, the multiplexed serial data DSM from the O / E conversion section 120 is supplied to the S / P conversion section 123. In the S / P converter 123, the word transmission rate based on the multiplexed serial data DSM is set to 108 Mbps.
Multiplexed parallel data DPM, which is 20-bit word string data, is obtained.

The multiplexed parallel data DPM from the S / P converter 123 is supplied to the data demapper 124. In the data demapping unit 124, the multiplexed parallel data DPM is subjected to a demapping process, and six systems of parallel digital data DPA to DPF based on the multiplexed parallel data DPM are obtained by being separated from each other. And the parallel digital data DPA to DPF
Are supplied to the P / S converters 125 to 130, respectively.

In P / S converters 125 to 130,
P / P is assigned to each of the parallel digital data DPA to DPF.
After the S conversion, the parallel digital data DPA ~
Each has a bit transmission rate of 270, based on the DPF.
Mbps serial digital data DSA to DS
F is reproduced. Then, the P / S conversion units 125 to 130
Digital data DSA-D obtained in
The SF is transmitted from the data separation unit 122.

In this manner, two systems of serial digital data DV reproduced in bit separation section 121 are output.
A and DVB and six serial digital data DSA to DSF reproduced in the data separation unit 122 are transmitted from the relay unit side reception unit 92.

An optical signal OAM having a center wavelength of about 0.83 μm reproduced by the demultiplexer 117 is supplied to the O / E converter 131. The O / E converter 131 performs a photoelectric conversion process on the optical signal OAM having a center wavelength of about 0.83 μm and a bit transmission rate of several tens of Mbps, and a light having a center wavelength of about 0.83 μm. The multiplexed serial data DAM having a bit transmission rate of several tens of Mbps based on the signal OAM is reproduced. The multiplexed serial data DAM obtained from the O / E conversion unit 131 is supplied to the data separation unit 132.

The data separating section 132 is configured in the same manner as the data separating section 49 in the relay unit side receiving section 12 shown in FIG. 1, and in the data separating section 132, the multiplexed serial data DAM is subjected to a separating process. 2 obtained
The serial digital data DAA and DAB of the system are reproduced. Then, the two systems of serial digital data DAA and DA
B is transmitted from the relay unit side receiving section 92.

In the example of the optical signal transmitting apparatus applied to the optical signal transmitting / receiving apparatus shown in FIG. 17 or the example of the optical signal transmitting method implemented in the optical signal transmitting / receiving apparatus, two systems of serial digital data DVA and DVB are used. Are, for example, serial HD signals, and each of the six systems of serial digital data DSA to DSF is, for example, S
DI signal, and each of the two serial digital data DAA and DAB forms, for example, a serial digital audio signal.
Therefore, for example, simultaneous transmission of a plurality of digital video signals as HD signals, a plurality of digital video signals as SDI signals, and a plurality of optical signals based on a plurality of digital audio signals is performed by one optical signal transmission. Through the cable 114, the operation is performed efficiently.

FIG. 20 is a diagram showing an example of an optical signal transmission method according to any one of claims 12 to 16 and claim 18 of the present application. An example of an optical signal transmitting / receiving apparatus to which another example of the optical signal transmitting apparatus according to any one of claims 28 to 31 in the claims is applied will be described.

The optical signal transmitting / receiving apparatus shown in FIG. 20 transmits / receives various signals to / from a CCU from a CCU-side transmitting section 141 which is a transmitting section in a CCU to which a video signal is supplied from a video camera. A plurality of serial digital data are transmitted to a relay unit side receiving unit 142 which is a receiving unit of a relay unit which is to be mounted on a vehicle.

In the optical signal transmitting / receiving apparatus shown in FIG. 20, in the CCU-side transmitting section 141, two systems of serial digital data DVA and DVB are supplied to a bit multiplexing section 143, and six systems of serial digital data are transmitted. DSA to DSF are supplied to the data multiplexing unit 144,
Further, two systems of serial digital data DAA and DAB are supplied to the data multiplexing unit 145.

Two systems of serial digital data DVA
And DVB, for example, are serial HD signals obtained by serializing HD signals, and have a bit transmission rate of, for example, 1.485 Gbps. In addition, six systems of serial digital data DSA ~
Each of the DSFs is, for example, an SDI signal obtained by serializing the D1 signal, and has a bit transmission rate of, for example, 270 Mbps. In addition, 2
Each of the serial digital data DAA and DAB of the system forms, for example, a serial digital audio signal.

The bit multiplexing section 143 has the same configuration as the bit multiplexing section 93 in the CCU-side transmitting section 91 shown in FIG. 17, and sets the bit transmission rate based on the serial digital data DVA and DVB from the bit multiplexing section 143 to 2. Composite serial data DVM of 97 Gbps is obtained and supplied to the E / O converter 146.

The E / O conversion section 146 is configured similarly to the E / O conversion section 96 in the CCU side transmission section 91 shown in FIG. 17, and performs an electro-optical conversion process on the composite serial data DVM from the bit multiplexing section 143. , Composite serial data D
Based on the VM, for example, the center wavelength is set to approximately 1.55 μ,
Optical signal OV with a bit transmission rate of 2.97 Gbps
Form M. The optical signal OVM obtained from the E / O conversion unit 146 is guided to the multiplexing unit 1147.

The data multiplexing section 144 has the same configuration as that of the data multiplexing section 94 in the CCU-side transmitting section 91 shown in FIG. Serial data D with 2.16 Gbps
SM is obtained and supplied to the E / O converter 148.

E / O conversion section 148 has the same configuration as E / O conversion section 110 in CCU-side transmission section 91 shown in FIG. 17, and performs electro-optical conversion processing on multiplexed serial data DSM from data multiplexing section 144. Based on the multiplexed serial data DSM, for example, an optical signal OSM having a center wavelength of about 1.3 μm and a bit transmission rate of 2.16 Gbps is formed. The optical signal OSM obtained from the E / O conversion unit 148 is guided to the multiplexing unit 149.

On the other hand, data multiplexing section 145 is configured in the same manner as data multiplexing section 55 in CCU-side transmitting section 51 shown in FIG. 12, and has a bit transmission rate based on serial digital data DAA and DAB from data multiplexing section 145. Is obtained, for example, several tens of Mbps.

The multiplexed serial data DAM sent from data multiplexing section 145 is supplied to E / O conversion section 150. E / O conversion section 150 is configured similarly to E / O conversion section 58 in CCU-side transmission section 51 shown in FIG.
M is subjected to electro-optical conversion processing to form an optical signal OAM based on the composite serial data DAM, for example, having a center wavelength of about 0.83 μm and a bit transmission rate of several tens of Mbps. Optical signal OAM obtained from E / O conversion section 150
Is guided to the multiplexing unit 149.

The multiplexing section 149 is constituted by a directional coupler type or a dielectric multilayer type WDM coupler or the like in the same manner as the multiplexing section 57 in the CCU side transmitting section 51 shown in FIG. Therefore, the center wavelength from the E / O converter 148 is approximately 1.3 μm, the optical signal OSM whose bit transmission rate is 2.16 Gbps, and the center wavelength from the E / O converter 150 is approximately 0.83 μm. A multiplexed optical signal OTM formed by combining the optical signal OAM having a bit transmission rate of several tens of Mbps and the optical signal OAM is derived. Then, the multiplexed optical signal OTM derived from the multiplexing unit 149 is
The signal is supplied to the multiplexing unit 147.

The multiplexing section 147 is configured in the same manner as the multiplexing section 56 of the CCU-side transmitting section 51 shown in FIG. 12 by, for example, a dielectric multilayer type WDM coupler or the like. The center wavelength from the O conversion unit 146 is set to approximately 1.55 μm, and the bit transmission rate is set to 2.97 Gbp.
s, an optical signal OSM whose central wavelength from the multiplexing section 149 is approximately 1.3 μm, and an optical signal OSM whose central wavelength is approximately 0.3 μm.
A multiplexed optical signal OTX formed by multiplexing the multiplexed optical signal OTM formed by multiplexing the optical signal OAM of 83 μm with the multiplexed optical signal OTX is derived.

In this way, the multiplexed optical signal OTX derived from the multiplexing unit 147 is transmitted from the CCU-side transmitting unit 141, and is connected to the CCU-side transmitting unit 141 and the optical signal transmission cable 1
The light is transmitted to the optical signal transmission cable 151 through the optical connector 152 that connects the optical fiber 51 to the relay unit 51, and is transmitted to the relay unit side receiving unit 142 through the optical signal transmission cable 151.
The optical signal transmission cable 151 is formed using, for example, a quartz SMF having an attenuation characteristic as shown in FIG. 28 and a dispersion characteristic as shown in FIG.

The multiplexed optical signal OTX transmitted through the optical signal transmission cable 151 is transmitted to the optical connector 1 for connecting the optical signal transmission cable 151 and the relay unit side receiving section 142.
It is guided to the relay unit side receiving section 142 through 53.

In the relay unit side receiving section 142,
The multiplexed optical signal OTX through the optical connector 153 is guided to the demultiplexing unit 155. The demultiplexing unit 155 is configured in the same manner as the demultiplexing unit 74 in the relay unit-side receiving unit 52 illustrated in FIG. 12 by, for example, a dielectric multilayer WDM coupler, and the multiplexed optical signal OTX is output from the demultiplexing unit 155. In,
An optical signal OVM having a center wavelength of about 1.55 μm and a bit transmission rate of 2.97 Gbps;
Optical signal OSM with a center wavelength of approximately 1.3 μm in TX
And an optical signal OAM having a center wavelength of about 0.83 μm and a multiplexed optical signal OTM obtained by multiplexing the optical signal OAM are separated and derived.

The center wavelength reproduced by the demultiplexer 155 is approximately 1.55 μm, and the bit transmission rate is 2.97 G
The optical signal OVM at bps is guided to the O / E converter 156. From the O / E converter 156, the center wavelength is approximately 1.
An optical signal OVM having a bit transmission rate of 2.97 Gbps, which is set to 55 μm, is obtained by performing a photoelectric conversion process.
Composite serial data DVM having a bit transmission rate of 2.97 Gbps is transmitted.

The composite serial data DVM having a bit transmission rate of 2.97 Gbps transmitted from the O / E converter 156 is supplied to a bit separator 157. The bit separation unit 157 is configured similarly to the bit separation unit 121 in the relay unit-side reception unit 92 illustrated in FIG.
The bit separation unit 157 sets the bit transmission rate to 2.
Based on the composite serial data DVM of 97 Gbps, each has a bit transmission rate of 2.97 Gbps / 2 =
Two serial digital data DVA and DVB of 1.485 Gbps are reproduced.

Further, a multiplexed light obtained by multiplexing an optical signal OSM having a center wavelength of about 1.3 μm and an optical signal OAM having a center wavelength of about 0.83 μm, which is reproduced by the demultiplexing section 155. The signal OTM is guided to the demultiplexer 158 at the next stage. The branching unit 158 is configured similarly to the branching unit 81 in the relay unit-side receiving unit 52 shown in FIG. 12 by a directional coupler type or a dielectric multilayer type WDM coupler or the like. The center wavelength in the multiplexed optical signal OTM is approximately 1.3 μm, and the bit transmission rate is 2.1.
An optical signal OSM of 6 Gbps and an optical signal OAM of a multiplexed optical signal OTM having a center wavelength of about 0.83 μm and a bit transmission rate of several tens of Mbps are separated and derived.

An optical signal OSM having a center wavelength of about 1.3 μm and a center wavelength of about 0.3 μm obtained by the demultiplexing section 158.
The optical signal OAM of 83 μm is supplied to O / E converters 159 and 160, respectively. The O / E converter 159 performs photoelectric conversion processing on the optical signal OSM having a center wavelength of about 1.3 μm and a bit transmission rate of 2.16 Gbps, and the light having a center wavelength of about 1.3 μm. Signal OSM
Multiplexed serial data DSM with a bit transmission rate of 2.16 Gbps is reproduced based on.

The multiplexed serial data DSM having a bit transmission rate of 2.16 Gbps obtained from the O / E converter 159 is supplied to the data separator 161. The data separation unit 161 is configured in the same manner as the data separation unit 122 in the relay unit side reception unit 92 shown in FIG. 17, and the data separation unit 161 sets the bit transmission rate from the O / E conversion unit 159 to 2.16 Gbps. Each of which has a bit transmission rate of 2
Six serial digital data DSA to DSF of 70 Mbps are reproduced.

Further, in the O / E conversion section 160,
An optical signal OAM having a center wavelength of about 0.83 μm and a bit transmission rate of several tens of Mbps is subjected to photoelectric conversion processing, and a bit transmission rate based on the optical signal OAM having a center wavelength of about 0.83 μm is increased by several tens. The multiplexed serial data DAM having Mbps is obtained. Multiplexed serial data DAM with a bit transmission rate of several tens of Mbps obtained from the O / E converter 160 is supplied to the data separator 162.

Data separation section 162 is provided in data separation section 132 in relay unit side reception section 92 shown in FIG.
And the data separation unit 162
The bit transmission rate from the E conversion unit 160 is several tens Mbps.
, The two serial digital data DAA and DAB are reproduced based on the multiplexed serial data DAM.

As described above, the two-system serial digital data DV reproduced in the bit separation unit 157
A and DVB, six serial digital data DSA to DSF reproduced by the data separation unit 161 and two serial digital data DAA and DAB reproduced by the data separation unit 162 are transmitted from the relay unit side reception unit 142. Sent out.

In the example of the optical signal transmission apparatus applied to the optical signal transmitting / receiving apparatus shown in FIG. 20 or the example of the optical signal transmission method implemented in the apparatus, the two systems of serial digital data DVA and DVB are used. Are, for example, serial HD signals, and each of the six systems of serial digital data DSA to DSF is, for example, S
DI signal, and each of the two serial digital data DAA and DAB forms, for example, a serial digital audio signal.
Therefore, for example, simultaneous transmission of a plurality of digital video signals as HD signals, a plurality of digital video signals as SDI signals, and a plurality of optical signals based on a plurality of digital audio signals is performed by one optical signal transmission. Through the cable 114, the operation is performed efficiently.

FIG. 21 is a block diagram showing the configuration of the first to third embodiments of the present invention.
The method according to any one of claims 22, 23, 26, and 27, wherein an example of the optical signal transmission method according to any one of the inventions described above is implemented. 1 shows an example of an optical signal transmission / reception device to which an example of the optical signal transmission device according to the invention is applied.

The optical signal transmitting / receiving apparatus shown in FIG. 21 transmits / receives various signals to / from a CCU from a CCU-side transmitting section 171 which is a transmitting section in a CCU to which a video signal from a video camera is supplied. A plurality of serial digital data are transmitted to a relay unit-side receiving unit 172 which is a receiving unit of the relay unit to be mounted on a vehicle.

In the optical signal transmitting / receiving apparatus shown in FIG. 21, the serial digital data DVA and DVB are converted by the E / O conversion section 17 in the CCU side transmission section 171.
3 and 174 respectively. Each of the serial digital data DVA and DVB is, for example, a serial HD signal obtained by serializing an HD signal, and has a bit transmission rate of, for example, 1.485 Gbps.

In the CCU-side transmitting section 171,
Serial digital data DAA and DAB different from the serial digital data DVA and DVB are supplied to the data multiplexing unit 175. Each of the serial digital data DAA and DAB forms a serial digital audio signal, for example.

The E / O conversion unit 173 operates as shown in FIG.
The E / O converter 173 is configured in the same manner as the E / O converter 13 in the CU-side transmission unit 11. The E / O converter 173 performs an electro-optical conversion process on the serial digital data DVA to substantially set the center wavelength based on the serial digital data DVA. 1.55μ
m, and an optical signal OVA having a bit transmission rate of 1.485 Gbps is obtained.

The E / O conversion section 174 has the same configuration as the E / O conversion section 14 in the CCU-side transmission section 11 shown in FIG. The DVB is subjected to electro-optical conversion processing to set the center wavelength based on the serial digital data DVB to approximately 1.
An optical signal OVB having a thickness of 3 μm and a bit transmission rate of 1.485 Gbps is obtained.

On the other hand, the data multiplexing section 175 has the same configuration as the data multiplexing section 15 in the CCU-side transmitting section 11 shown in FIG. 1, and includes a serial digital data DAA and a serial digital data DAB. And multiplexed serial data DAM, which is serial digital data obtained as a result.
For example, assuming that the bit transmission rate is several tens Mbps.

The multiplexed serial data DAM sent from the data multiplexing unit 175 is supplied to the E / O conversion unit 176. The E / O conversion unit 176 includes, for example, a laser driving unit 177 and a 1.48 μm band FP laser diode 178 as shown in FIG. Then, the multiplexed serial data DAM from the data multiplexing unit 175 is
The laser drive signal S is supplied to the laser driver 177 and is output from the laser driver 177 in accordance with the multiplexed serial data DAM.
LDM 'is obtained and supplied to the 1.48 μm band FP laser diode 178.

1.48 μm band FP laser diode 17
8 oscillates in a multi-wavelength mode, for example, as shown in FIG.
A laser beam having a wavelength spectrum ranging from 1.48 μm band FP supplied with laser drive signal SLDM ′
The laser diode 178 has a center wavelength of about 1.48 μm.
The laser light in the 1.48 μm band,
The E / O conversion unit 176 emits the multiplexed serial data DA with the state modulated by the LDM '.
Optical signal O having a center wavelength of about 1.48 μm based on M
AM ′ is obtained with the bit transmission rate set to several tens of Mbps.

The center wavelength obtained from the E / O converter 173 is approximately 1.55 μm, and the bit transmission rate is 1.485.
Gbps optical signal OVA and E / O converter 17
The optical signal OAM ′ having a center wavelength of about 1.48 μm and a bit transmission rate of several tens of Mbps obtained from 6 is supplied to the multiplexer 179. Further, an optical signal OVB having a center wavelength obtained from the E / O conversion unit 174 of approximately 1.3 μm and a bit transmission rate of 1.485 Gbps is supplied to the multiplexing unit 180.

The multiplexing section 179 is configured in the same manner as the multiplexing section 18 in the CCU-side transmitting section 11 shown in FIG. 1, and the multiplexing section 179 and the optical signal OVA whose center wavelength is approximately 1.55 μm are Optical signal OA having a wavelength of approximately 1.48 μm
M ′ is multiplexed with M ′ to obtain a multiplexed optical signal OQM ′. Multiplexed optical signal OQM 'obtained from multiplexing section 179
Is supplied to the multiplexing unit 180.

The multiplexing section 180 to which the optical signal OVB from the E / O conversion section 174 and the multiplexed optical signal OQM 'from the multiplexing section 179 are supplied is connected to, for example, a dielectric multilayer type WDM coupler. 1 is configured in the same manner as the multiplexing unit 25 in the CCU-side transmitting unit 11 shown in FIG.
An optical signal OVB having a center wavelength of about 1.3 μm, an optical signal OVA having a center wavelength of about 1.55 μm, and an optical signal OAM ′ having a center wavelength of about 1.48 μm are multiplexed and obtained. A multiplexed optical signal OVX 'obtained by multiplexing the multiplexed optical signals OQM' is derived.

The multiplexed optical signal O derived from the multiplexing section 180
VX ′ is transmitted from the CCU side transmitting section 171 and
Signal transmission cable 181 through an optical connector 182 connecting the side transmission unit 171 and the optical signal transmission cable 181
And transmitted through the optical signal transmission cable 181 to the relay unit side receiving section 172 side. The optical signal transmission cable 181 is formed using, for example, a quartz SMF having an attenuation characteristic as shown in FIG. 28 and a dispersion characteristic as shown in FIG.

The multiplexed optical signal OVX ′ transmitted through the optical signal transmission cable 181 is
The light is guided to the relay unit side receiving unit 172 through the optical connector 183 that connects the relay unit side receiving unit 172 to the relay unit side receiving unit 172.

In the relay unit side receiving section 172,
The multiplexed optical signal OVX ′ through the optical connector 183 is guided to the demultiplexing unit 185. The demultiplexing unit 185 is configured in the same manner as the demultiplexing unit 36 of the relay unit-side receiving unit 12 shown in FIG. 1 by, for example, a dielectric multilayer type WDM coupler or the like. The center wavelength in the middle is approximately 1.3 μm, and the bit transmission rate is 1.
485 Gbps optical signal OVB and multiplexed optical signal OV
Optical signal OVA whose center wavelength in X ′ is approximately 1.55 μm
The multiplexed optical signal OQM 'obtained by multiplexing the optical signal OAM' having a center wavelength of about 1.48 μm with the optical signal OAM 'is separated and derived.

The optical signal OV reproduced by the demultiplexer 185
B is supplied to the O / E conversion unit 186. The O / E converter 186 has an optical signal OVB having a center wavelength of approximately 1.3 μm and a bit transmission rate of 1.485 Gbps.
To a bit transmission rate of 1.48 based on an optical signal OVB having a center wavelength of about 1.3 μm.
Reproduce serial digital data DVB of 5 Gbps.

A multiplexed light obtained by multiplexing an optical signal OVA having a center wavelength of about 1.55 μm and an optical signal OAM ′ having a center wavelength of about 1.48 μm, which is reproduced by the demultiplexer 185. The signal OQM ′ is guided to the next-stage branching section 187. The demultiplexing unit 187 has the same configuration as the demultiplexing unit 41 in the relay unit-side receiving unit 12 illustrated in FIG. 1, and sets the center wavelength in the multiplexed optical signal OQM ′ to approximately 1.55 μm from the demultiplexing unit 187. 1.485 Gb bit transmission rate
The optical signal OVA with ps and the optical signal OAM 'with a center wavelength in the multiplexed optical signal OQM' of approximately 1.48 μm and a bit transmission rate of several tens of Mbps are separated and derived.

The optical signal OVA having a center wavelength of about 1.55 μm and the optical signal OAM ′ having a center wavelength of about 1.48 μm, which are reproduced by the demultiplexing section 187, are converted by the O / E conversion section 1.
88 and 189 respectively. O / E converter 188
, A photoelectric conversion process is performed on an optical signal OVA having a center wavelength of about 1.55 μm and a bit transmission rate of 1.485 Gbps, and a bit based on the optical signal OVA having a center wavelength of about 1.55 μm. 1.485 transmission rate
Gbps serial digital data DVA is reproduced. In the O / E converter 189, the center wavelength is set to approximately 1.48 μm, and the bit transmission rate is set to several tens of Mbp.
s based on the optical signal OAM ′ having a center wavelength of about 1.48 μm by performing photoelectric conversion processing on the optical signal OAM ′.
The multiplex serial data DAM having a bit transmission rate of several tens of Mbps is reproduced.

The multiplexed serial data DAM obtained from the O / E converter 189 is supplied to the data separator 190. The data separating unit 190 is configured in the same manner as the data separating unit 48 in the relay unit-side receiving unit 12 shown in FIG. 1, and in the data separating unit 190, performs a demultiplexing process on the multiplexed serial data DAM. The two obtained data, serial digital data DAA and serial digital data DAB, are reproduced.

In this manner, serial digital data DVA, O /
The serial digital data DVB reproduced by the E conversion unit 186 and the serial digital data DAA and DAB reproduced by the data separation unit 190 are transmitted from the relay unit side receiving unit 172.

Even in the example of the optical signal transmission apparatus applied to the optical signal transmission / reception apparatus shown in FIG. 21 or the example of the optical signal transmission method implemented therein, the optical signal transmission / reception apparatus shown in FIG. As in the case of the example of the optical signal transmission device applied to the first embodiment or the example of the optical signal transmission method implemented in the same, the serial digital data DVA and DVB
Are, for example, serial HD signals, and each of the serial digital data DAA and DAB is, for example, a serial digital audio signal. The simultaneous transmission of a plurality of optical signals based on the digital video signal and the plurality of digital audio signals is efficiently performed through one optical signal transmission cable 181.

FIG. 24 shows an example of an optical signal transmission method according to any one of the twelfth, thirteenth, sixteenth and nineteenth to twenty-first aspects of the present invention. And an optical signal transmission / reception apparatus to which an example of the optical signal transmission apparatus according to any one of claims 28, 29, 32, and 33 in the claims of the present application is applied. 1 shows an example of an apparatus.

The optical signal transmitting / receiving apparatus shown in FIG. 24 transmits / receives various signals to / from a CCU from a CCU-side transmitting section 201 which is a transmitting section in a CCU to which a video signal is supplied from a video camera. A plurality of serial digital data are transmitted to a relay unit-side receiving unit 202 which is a receiving unit of a relay unit which is to be mounted on a vehicle.

In the optical signal transmitting / receiving apparatus shown in FIG. 24, in the CCU-side transmitting section 201, two systems of serial digital data DVA and DVB are supplied to a bit multiplexing section 203, and six systems of serial digital data are transmitted. DSA to DSF are supplied to the data multiplexing unit 204,
Further, two systems of serial digital data DAA and DAB are supplied to the data multiplexing unit 205.

Two-system serial digital data DVA
And DVB, for example, are serial HD signals obtained by serializing HD signals, and have a bit transmission rate of, for example, 1.485 Gbps. In addition, six systems of serial digital data DSA ~
Each of the DSFs is, for example, an SDI signal obtained by serializing the D1 signal, and has a bit transmission rate of, for example, 270 Mbps. In addition, 2
Each of the serial digital data DAA and DAB of the system forms, for example, a serial digital audio signal.

Bit multiplexing section 203 is configured similarly to bit multiplexing section 143 in CCU-side transmitting section 141 shown in FIG.
The VB is subjected to bit multiplexing / combining processing to form composite serial data DVM having a bit transmission rate of 1.485 Gbps × 2 = 2.97 Gbps. In this way,
Composite serial data D obtained from bit multiplexing section 203
The VM is supplied to the E / O conversion unit 206.

E / O conversion section 206 is configured similarly to E / O conversion section 146 in CCU-side transmission section 141 shown in FIG. 20, and performs electro-optical conversion processing on composite serial data DVM from bit multiplexing section 203. Based on the composite serial data DVM, for example, the center wavelength is set to approximately 1.55 μm
And an optical signal OVM having a bit transmission rate of 2.97 Gbps is formed. The optical signal OVM obtained from the E / O converter 206 is guided to the multiplexer 207.

Data multiplexing section 204 is provided in data multiplexing section 14 in CCU-side transmitting section 141 shown in FIG.
4, and in the data multiplexing unit 204,
Based on six systems of serial digital data DSA to DSF each having a bit transmission rate of 270 Mbps,
For example, multiplex serial data DSM having a bit transmission rate of 2.16 Gbps is formed.

The multiplexed serial data DSM having the bit transmission rate of 2.16 Gbps obtained in the data multiplexing section 204 is supplied to the E / O conversion section 208. E /
The O conversion section 208 is a CCU-side transmission section 1 shown in FIG.
41, the multiplexed serial data DSM from the data multiplexing unit 204 is subjected to electro-optical conversion processing, and based on the multiplexed serial data DSM, for example, the center wavelength is set to approximately 1.3 μm, An optical signal OSM having a transmission rate of 2.16 Gbps is formed. The optical signal OSM obtained from the E / O converter 208 is
The light is guided to the multiplexing unit 209.

Further, data multiplexing section 205 is provided with data multiplexing section 1 in CCU-side transmitting section 141 shown in FIG.
In the data multiplexing unit 205, the serial digital data DAA and the serial digital data DAB are multiplexed, and the resulting serial digital data, that is, the multiplexed serial data DAM, Bit transmission rate of tens of Mbps
And send it out.

The multiplexed serial data DAM sent from the data multiplexing unit 205 is supplied to the E / O conversion unit 210. E / O conversion section 210 is configured similarly to E / O conversion section 150 in CCU-side transmission section 141 shown in FIG.
AM is subjected to light-to-light conversion processing, and composite serial data DAM
For example, an optical signal OAM ′ having a center wavelength of about 1.48 μm and a bit transmission rate of several tens of Mbps is formed. Optical signal OA obtained from E / O conversion section 210
M ′ is guided to the multiplexing unit 207.

The multiplexing unit 207 is configured in the same manner as the multiplexing unit 149 in the CCU-side transmitting unit 141 shown in FIG. 20 by a directional coupler type or a dielectric multilayer type WDM coupler or the like. From the E / O converter 206
, The center wavelength from the optical signal OVM and the E / O converter 210 is approximately 1.48 μm, and the bit transmission rate is several tens of Mbps. A multiplexed optical signal OTM 'formed by multiplexing with the optical signal OAM' is derived.
The multiplexed optical signal OT derived from the multiplexing unit 207
M ′ is supplied to the multiplexing unit 209.

The multiplexing unit 209 is configured in the same manner as the multiplexing unit 147 in the CCU-side transmitting unit 141 shown in FIG. 20 by, for example, a dielectric multilayer type WDM coupler or the like.
From the multiplexing unit 209, the optical signal OSM whose central wavelength from the E / O conversion unit 208 is approximately 1.3 μm, and the multiplexing unit 20
Optical signal OVM whose center wavelength from No. 7 is approximately 1.55 μm
A multiplexed optical signal OTX 'obtained by multiplexing the multiplexed optical signal OTM' obtained by multiplexing the optical signal OAM 'having the center wavelength of about 1.48 μm with the optical signal OAM' is derived.

In this way, the multiplexed optical signal OTX ′ derived from the multiplexing unit 209 is transmitted from the CCU-side transmitting unit 201, and the optical connector 212 that connects the CCU-side transmitting unit 201 and the optical signal transmission cable 211. Through the optical signal transmission cable 211,
Is transmitted to the relay unit side receiving section 202 through The optical signal transmission cable 211 is formed using, for example, a quartz SMF having an attenuation characteristic as shown in FIG. 28 and a dispersion characteristic as shown in FIG.

The multiplexed optical signal OTX ′ transmitted through the optical signal transmission cable 211 is
The light is guided to the relay unit-side receiving unit 202 through the optical connector 213 that connects the relay unit-side receiving unit 202 with the relay unit-side receiving unit 202.

In the relay unit side receiving section 202,
The multiplexed optical signal OTX ′ through the optical connector 213 is guided to the demultiplexing unit 215. The demultiplexing unit 215 is configured in the same manner as the demultiplexing unit 155 in the relay unit side receiving unit 142 shown in FIG. 20 by, for example, a dielectric multilayer type WDM coupler or the like.
An optical signal OSM having a center wavelength of about 1.3 μm and a bit transmission rate of 2.16 Gbps in X ′, and an optical signal OVM having a center wavelength of about 1.55 μm in a multiplexed optical signal OTX ′ and a center Optical signal O having a wavelength of about 1.48 μm
The multiplexed optical signal OTM 'obtained by multiplexing the AM' and the AM 'is separated and derived.

The center wavelength reproduced by the demultiplexer 215 is approximately 1.3 μm, and the bit transmission rate is 2.16 Gb.
The optical signal OSM having ps is guided to the O / E conversion unit 216. The O / E conversion unit 216 is configured similarly to the O / E conversion unit 159 in the relay unit-side reception unit 142 shown in FIG. 20. The O / E conversion unit 216 sets the center wavelength to approximately 1.3 μm, 2.16 Gbps transmission rate
Multiplexed serial data DSM having a bit transmission rate of 2.16 Gbps, which is obtained by subjecting an optical signal OSM to a photoelectric conversion process, is transmitted.

The multiplexed serial data DSM having a bit transmission rate of 2.16 Gbps obtained from the O / E converter 216 is supplied to the data separator 217. The data separation unit 217 is configured similarly to the data separation unit 161 in the relay unit side reception unit 142 illustrated in FIG.
The data separation unit 217 reproduces six serial digital data DSA to DSF each having a bit transmission rate of 270 Mbps based on the multiplexed serial data DSM having a bit transmission rate of 2.16 Gbps from the O / E conversion unit 216. Is done.

A multiplex obtained by multiplexing an optical signal OVM having a center wavelength of about 1.55 μm and an optical signal OAM ′ having a center wavelength of about 1.48 μm, reproduced by the demultiplexing section 215. The optical signal OTM ′ is supplied to the branching section 218 at the next stage. The demultiplexing unit 218 is formed by a directional coupler type or a dielectric multilayer type WDM coupler, etc.
8 and the multiplexed optical signal O
An optical signal OVM having a center wavelength of about 1.55 μm and a bit transmission rate of 2.97 Gbps in TM ′ and a center wavelength of about 1.48 μm and a bit transmission rate of multiplexed optical signal OTM ′ of several Optical signal OA at 10 Mbps
M ′ are derived separately from each other.

The optical signal OVM having a center wavelength of about 1.55 μm and the optical signal OAM ′ having a center wavelength of about 1.48 μm, which are obtained by the demultiplexer 218, are combined with the O / E converter 2.
19 and 220 respectively. O / E converter 219
, A photoelectric conversion process is performed on an optical signal OVM having a center wavelength of approximately 1.55 μm and a bit transmission rate of 2.97 Gbps, and a bit based on the optical signal OVM having a center wavelength of approximately 1.55 μm 2.97 Gb transmission rate
The composite serial data DVM of ps is reproduced. In the O / E converter 220, the center wavelength is set to approximately 1.
The optical signal OAM 'having a bit transmission rate of several tens of Mbps is subjected to photoelectric conversion processing, and the multiplexing is performed based on the optical signal OAM' having a center wavelength of about 1.48 μm, and the bit transmission rate is several tens of Mbps. Serial data DA
Play M.

The composite serial data DVM with a bit transmission rate of 2.97 Gbps obtained from the O / E converter 219 is supplied to the bit separator 221. The bit separation unit 221 is configured similarly to the bit separation unit 157 in the relay unit side reception unit 142 illustrated in FIG.
In the bit separation unit 220, the bit transmission rate is set to 2.
Based on the composite serial data DVM of 97 Gbps, each has a bit transmission rate of 2.97 Gbps / 2 =
Two serial digital data DVA and DVB of 1.485 Gbps are reproduced.

The multiplexed serial data DAM having a bit transmission rate of several tens of Mbps obtained from the O / E converter 220 is supplied to the data separator 222. The data separating section 222 is configured in the same manner as the data separating section 162 in the relay unit side receiving section 142 shown in FIG.
The two systems of serial digital data DAA and DAB are reproduced based on the multiplexed serial data DAM having a bit transmission rate of several tens of Mbps.

As described above, two systems of serial digital data DV reproduced in the bit separation section 221 are provided.
A and DVB, six serial digital data DSA to DSF reproduced by the data separation unit 217, and two serial digital data DAA and DAB reproduced by the data separation unit 222 are transmitted from the relay unit side reception unit 202. Sent out.

In the example of the optical signal transmitting apparatus applied to the optical signal transmitting / receiving apparatus shown in FIG. 24 or the example of the optical signal transmitting method implemented in the optical signal transmitting / receiving apparatus, two systems of serial digital data DVA and DVB are used. Are, for example, serial HD signals, and each of the six systems of serial digital data DSA to DSF is, for example, S
DI signal, and each of the two serial digital data DAA and DAB forms, for example, a serial digital audio signal.
Therefore, for example, simultaneous transmission of a plurality of digital video signals as HD signals, a plurality of digital video signals as SDI signals, and a plurality of optical signals based on a plurality of digital audio signals is performed by one optical signal transmission. This is performed efficiently through the cable 211.

[0180]

As is apparent from the above description, the optical signal transmission / reception method according to any one of claims 1 to 11 in the claims of the present application, or the method of claim 1 of the present invention, In the optical signal transmission device according to any one of claims 22 to 27 in the scope, the first, second, and third serial digital data may be different from each other in the first and second serial digital data, respectively. Converted into first, second, and third optical signals having second and third center wavelengths, and further combined with the first, second, and third optical signals to form a multiplexed optical signal; The multiplexed optical signal is transmitted through an optical signal transmission cable.

Such an optical signal transmission cable through which a multiplexed optical signal is transmitted substantially consists of the first and second optical signals.
And the third optical signal. Therefore, simultaneous transmission of a plurality of optical signals based on a plurality of serial digital data is efficiently performed in order to minimize the number of installed optical signal transmission cables.

Further, as described above, the optical signal transmission method according to any one of claims 12 to 21 in the claims of the present application, or claim 28 in the claims of the present application. In the optical signal transmission apparatus according to any one of the above aspects, the composite serial data based on the plurality of first serial digital data and the first serial data based on the plurality of second serial digital data may be used. Multiple serial data and multiple thirds
The second multiplexed serial data is formed based on the serial digital data of
The first multiplex serial data and the second multiplex serial data are converted into first, second, and third optical signals having first, second, and third center wavelengths different from each other, respectively. The first, second, and third optical signals are multiplexed to form a multiplexed optical signal, and the multiplexed optical signal is transmitted through an optical signal transmission cable.

Such an optical signal transmission cable through which a multiplexed optical signal is transmitted also substantially includes the first and second optical signals.
And the third optical signal. Therefore, simultaneous transmission of a plurality of optical signals based on the plurality of first serial digital data, the plurality of second serial digital data, and the plurality of third serial digital data minimizes the number of installed optical signal transmission cables. It will be performed efficiently in order to keep the limit.

Further, the optical signal transmission method or the optical signal transmission device according to the invention described in the claims of the present application can be used, for example, for transmitting a plurality of digital video signals and digital audio signals, which are HD signals or D1 signals. When applied to simultaneous transmission of a plurality of optical signals based on digital information signals, a plurality of serial digital data, or a plurality of first serial digital data, a plurality of second serial digital data, and a plurality of third Is obtained by serializing digital information signals such as a plurality of digital video signals and digital audio signals which are HD signals or D1 signals. Thereby, for example, simultaneous transmission of a plurality of optical signals based on digital information signals such as a plurality of digital video signals and digital audio signals as HD signals or D1 signals is efficiently performed through one optical signal transmission cable. .

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of an optical signal transmission method according to the present invention; FIG. 26 is a block connection diagram illustrating an example of an optical signal transmission / reception device to which an example of the optical signal transmission device according to any one of claims 22 to 25 is applied.

FIG. 2 is a block diagram illustrating a specific configuration example of an E / O conversion unit used in the example of FIG. 1;

FIG. 3 shows 1.55 μm used in the specific configuration example of FIG. 2;
FIG. 4 is a characteristic diagram used for describing a band DFB laser diode.

FIG. 4 is a block diagram illustrating a specific configuration example of an E / O conversion unit used in the example of FIG. 1;

FIG. 5 is a characteristic diagram used for explaining a 1.3 μm band FP laser diode used in the specific configuration example of FIG. 4;

FIG. 6 is a block configuration diagram equivalently showing a specific configuration example of a multiplexing unit used in the example of FIG. 1;

FIG. 7 is a block diagram illustrating a specific configuration example of an E / O conversion unit used in the example of FIG. 1;

8 is 0.83 μm used in the specific configuration example of FIG. 7;
FIG. 4 is a characteristic diagram used for describing a band FP laser diode.

FIG. 9 is a block configuration diagram equivalently showing a specific configuration example of a multiplexing unit used in the example of FIG. 1;

FIG. 10 is a block configuration diagram equivalently showing a specific configuration example of a demultiplexing unit used in the example of FIG. 1;

11 is a block configuration diagram equivalently showing a specific configuration example of a branching unit used in the example of FIG. 1;

FIG. 12 is a block diagram of an optical signal transmission method according to an embodiment of the present invention, in which an example of the optical signal transmission method according to any one of claims 1 to 5, 7 and 11 in the claims of the present application is implemented. FIG. 25 is a block diagram showing an example of an optical signal transmitting / receiving apparatus to which another example of the optical signal transmitting apparatus according to any one of claims 22 to 25 in the claims is applied.

FIG. 13 is a block configuration diagram equivalently showing a specific configuration example of a multiplexing unit used in the example of FIG. 12;

14 is a block configuration diagram equivalently showing a specific configuration example of a multiplexing unit used in the example of FIG.

FIG. 15 is a block configuration diagram equivalently showing a specific configuration example of a demultiplexing unit used in the example of FIG. 12;

FIG. 16 is a block configuration diagram equivalently showing a specific configuration example of a demultiplexing unit used in the example of FIG. 12;

FIG. 17: Claim 12 in the claims of the present application
The invention according to any one of claims 28 to 31 in the claims of the present application, in which an example of the optical signal transmission method according to the invention described in any one of claims to 17 is implemented. It is a block connection diagram showing an example of an optical signal transmitting / receiving device to which an example of such an optical signal transmission device is applied.

18 is a block diagram illustrating a specific configuration example of a data multiplexing unit used in the example of FIG. 17;

FIG. 19 is a block diagram showing a specific configuration example of a data separation unit used in the example of FIG. 17;

FIG. 20. Claim 12 in the claims of the present application
28 to 31 in the claims of the present application, wherein an example of the optical signal transmission method according to the invention described in any one of claims to 16 and 18 is implemented.
FIG. 13 is a block connection diagram illustrating an example of an optical signal transmission / reception device to which another example of the optical signal transmission device according to any one of the inventions described above is applied.

FIG. 21. Claim 1 in the claims of the present application
Claim 2 in the claims of the present application, wherein one example of the optical signal transmission method according to the invention described in any one of Claims 2, 5, 5, and 11 is implemented.
FIG. 27 is a block connection diagram illustrating an example of an optical signal transmitting / receiving apparatus to which an example of the optical signal transmission apparatus according to any one of claims 23, 26, and 27 is applied.

FIG. 22 is a block diagram showing a specific configuration example of an E / O conversion unit used in the example of FIG. 21;

23. 1.48 used in the specific configuration example of FIG.
FIG. 4 is a characteristic diagram used for describing a μm band FP laser diode.

FIG. 24. Claim 1 in the claims of the present application
2. An optical signal transmission method according to claim 13, wherein the optical signal transmission method according to any one of claims 13, 16 and 19 to 21 is implemented. Claim 29, Claim 32 and Claim 33
FIG. 3 is a block connection diagram illustrating an example of an optical signal transmission / reception device to which an example of the optical signal transmission device according to any one of the inventions described above is applied.

FIG. 25 is a chart showing a data format of word string data forming a digital video signal.

FIG. 26 is a chart showing a data format of word string data forming a digital video signal.

FIG. 27 is a chart showing a data format of word string data forming a digital video signal.

FIG. 28 is a characteristic diagram showing an attenuation characteristic of a quartz-based SMF.

FIG. 29 is a characteristic diagram showing dispersion characteristics of a quartz-based SMF.

[Explanation of symbols]

11,51,91,141,171,201 ... CC
U side transmission section, 12, 52, 92, 142, 172, 2
02 ... Reception unit on the relay unit side, 13, 14, 2
6,53,54,58,96,110,112,14
6,148,150,173,174,176,20
6, 208, 210... E / O converter, 15, 5
5,94,95,144,145,175,204,2
05: Data multiplexing section, 16, 19, 27, 177
... Laser driver, 17 ... 1.55μm band DF
B laser diode, 18, 25, 56, 57, 9
7,111,147,149,179,180,20
7, 209: multiplexing part, 20: 1.3 μm band F
P laser diode, 21, 23, 24, 29, 3
1,32,34,35,37,39,40,42,4
4,45,60,62,63,65,67,68,7
1,72,75,77,78,82,84,85,11
5,116,152,153,182,183,21
2,213 ... optical connector, 22, 43, 61, 8
3 ... directional coupling part, 28 ... 0.83 μm band F
P laser diode, 30, 38, 66, 76 ...
Dielectric multilayer part, 33, 70, 114, 151, 18
1,211 ... optical signal transmission cable, 36,41,
74, 81, 117, 118, 155, 158, 18
5,187,215,218... Demultiplexer, 46,4
7, 48, 80, 86, 87, 119, 120, 13
1,156,159,160,186,188,18
9,216,219,220... O / E converter, 4
9,88,122,132,161,162,190,
217, 222 ... data separation unit, 93, 143
203: bit multiplexing unit, 101 to 106, 123
... S / P converter, 107 ... data mapping unit, 108, 125-130 ... P / S converter,
121, 157, 221... Bit separation unit, 124
... Data demapping unit, 178 ... 1.48μ
m-band FP laser diode

Claims (33)

[Claims] 1. A method for converting a first serial digital data into a first optical signal having a first center wavelength, and converting the second serial digital data into a second center wavelength different from the first center wavelength. Into a second optical signal having
The third serial digital data is converted to a third serial digital data having a third center wavelength different from each of the first and second center wavelengths.
A first multiplexed optical signal is formed by subjecting two of the first, second, and third optical signals to multiplexing processing using multiplexing means. A second multiplexed optical signal is formed by subjecting the first multiplexed optical signal and the first, second and third optical signals other than the above two to multiplexing processing using multiplexing means. And transmitting the second multiplexed optical signal to the optical signal transmission cable and transmitting the signal through the optical signal transmission cable. 2. The method according to claim 1, wherein the first serial digital data is modulated by modulating a laser beam emitted by first laser means for emitting a laser beam having a first center wavelength in accordance with the first serial digital data. A second optical signal, and modulates the laser light emitted by the second laser means for emitting a laser light having a second center wavelength in accordance with the second serial digital data. Converting the data into a second optical signal, and further emitting a laser beam having a third center wavelength in accordance with the third serial digital data.
The third serial digital data is converted to the third serial data by modulating the laser light emitted by the laser means.
The optical signal transmission method according to claim 1, wherein the optical signal is converted into an optical signal. 3. The optical signal according to claim 2, wherein the first center wavelength is longer than the second center wavelength and the second center wavelength is longer than the third center wavelength. Transmission method. 4. The laser device according to claim 1, wherein the first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is a 0.83 μm band laser diode. The optical signal transmission method according to claim 3, wherein 5. A first multiplexed optical signal is obtained by subjecting two of the first, second, and third optical signals to multiplexing processing using a first wavelength multiplexing coupler as multiplexing means. At the same time, a multiplexing process using a second wavelength multiplexing coupler as multiplexing means is performed on the first multiplexed optical signal and those other than the two of the first, second, and third optical signals. The optical signal transmission method according to claim 3 or 4, wherein a second multiplexed optical signal is obtained by performing the second multiplexed optical signal. 6. A first multiplexed optical signal is obtained based on the first and second optical signals, and the first multiplexed optical signal and a third multiplexed optical signal are obtained.
6. The optical signal transmission method according to claim 3, wherein a second multiplexed optical signal is obtained based on the optical signal. 7. A first multiplexed optical signal is obtained based on the second and third optical signals, and the first multiplexed optical signal and the first multiplexed optical signal are obtained.
6. The optical signal transmission method according to claim 3, wherein a second multiplexed optical signal is obtained based on the optical signal. 8. The optical signal according to claim 2, wherein the first center wavelength is longer than the third center wavelength, and the third center wavelength is longer than the second center wavelength. Transmission method. 9. The method according to claim 1, wherein the first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is a 1.48 μm band laser diode. The optical signal transmission method according to claim 8, wherein 10. A first multiplexed optical signal is obtained based on the first and third optical signals, and a second multiplexed optical signal is obtained based on the first multiplexed optical signal and the second optical signal. The optical signal transmission method according to claim 8 or 9, wherein: 11. The method according to claim 1, wherein the third serial digital data is obtained as multiplexed serial data by multiplexing a plurality of digital data.
The optical signal transmission method according to any one of claims 1 to 10. 12. A multi-synthesis process is performed on a plurality of first serial digital data to form composite serial data, and the composite serial data is converted into a first optical signal having a first center wavelength. Multiplexing the second serial digital data to form first multiplexed serial data,
The first multiplexed serial data is converted into a second optical signal having a second center wavelength different from the first center wavelength, and multiplexed to a plurality of third serial digital data to perform a second Form multiplexed serial data of
Converting the second multiplexed serial data into a third optical signal having a third central wavelength different from each of the first and second central wavelengths; Two of the signals are subjected to multiplexing processing using multiplexing means to form a first multiplexed optical signal, and the first multiplexed optical signal and the first, second, and third optical signals A second multiplexed optical signal is formed by performing multiplexing processing using multiplexing means on the other than the above two, and the second multiplexed optical signal is transmitted to an optical signal transmission cable. An optical signal transmission method for transmitting through the optical signal transmission cable. 13. The composite serial data is converted into a first optical signal by modulating a laser beam emitted by a first laser means for emitting a laser beam having a first center wavelength according to the composite serial data. The first multiplexed serial data is converted to a second light by modulating the laser light emitted by the second laser means for emitting a laser light having a second center wavelength in accordance with the first multiplexed serial data. The second multiplexed serial data is converted into a signal and further modulated by a laser beam emitted by a third laser means for emitting a laser beam having a third center wavelength according to the second multiplexed serial data. The third
The optical signal transmission method according to claim 12, wherein the optical signal is converted into an optical signal. 14. An optical signal according to claim 13, wherein the first center wavelength is longer than the second center wavelength, and the second center wavelength is longer than the third center wavelength. Transmission method. 15. The first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is 0.83 μm band.
15. A band laser diode.
The optical signal transmission method according to the above. 16. A first multiplexed optical signal is obtained by subjecting two of the first, second, and third optical signals to multiplexing processing using a first wavelength multiplexing coupler as multiplexing means. At the same time, a multiplexing process using a second wavelength multiplexing coupler as multiplexing means is performed on the first multiplexed optical signal and those other than the two of the first, second, and third optical signals. 16. The optical signal transmission method according to claim 14, wherein the second multiplexed optical signal is obtained by performing the second multiplexed optical signal. 17. A first multiplexed optical signal is obtained based on the first and second optical signals, and a second multiplexed optical signal is obtained based on the first and third optical signals. The optical signal transmission method according to any one of claims 14 to 16, wherein: 18. A first multiplexed optical signal is obtained based on the second and third optical signals, and a second multiplexed optical signal is obtained based on the first multiplexed optical signal and the first optical signal. The optical signal transmission method according to any one of claims 14 to 16, wherein: 19. The optical signal according to claim 13, wherein the first center wavelength is longer than the third center wavelength, and the third center wavelength is longer than the second center wavelength. Transmission method. 20. The first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is 1.48 μm band.
20. A band laser diode.
The optical signal transmission method according to the above. 21. A first multiplexed optical signal is obtained based on the first and third optical signals, and a second multiplexed optical signal is obtained based on the first multiplexed optical signal and the second optical signal. The optical signal transmission method according to claim 19 or 20, wherein: 22. The first serial digital data is transmitted to a first
A first electro-optical converter for converting the first serial optical data into a first optical signal having a second central wavelength, and a second optical signal having a second central wavelength different from the first central wavelength. A second electro-optical conversion unit for converting the third serial digital data; and a third electro-optical converter having a third center wavelength different from each of the first and second center wavelengths.
A third optical-to-optical converter for converting the optical signal into a first optical signal, and a multiplexing process for two of the first, second, and third optical signals to obtain a first multiplexed optical signal. A multiplexing unit, a multiplexing process is performed on a signal other than the two of the first multiplexed optical signal and the first, second, and third optical signals to obtain a second multiplexed optical signal; A second multiplexing unit that transmits the second multiplexed optical signal to the optical signal transmission cable. 23. The first electro-optical conversion section modulates a laser beam emitted by a first laser means for emitting a laser beam having a first center wavelength in accordance with first serial digital data. The first serial digital data is converted into a first optical signal, and the second electro-optical converter converts the laser light emitted by the second laser means for emitting a laser light having a second center wavelength into a second serial signal. The second serial digital data is converted into a second optical signal by modulating the second serial digital data according to the digital data, and the third light-to-light conversion unit emits a laser light having a third center wavelength. The third serial digital data is converted into a third optical signal by modulating the laser light emitted by the laser means according to the third serial digital data. Optical signal transmission apparatus according to claim 22, wherein the converting. 24. The light according to claim 23, wherein the first center wavelength is longer than the second center wavelength, and the second center wavelength is longer than the third center wavelength. Signal transmission device. 25. The first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is 0.83 μm.
25. A band laser diode.
The optical signal transmission device according to claim 1. 26. The light according to claim 23, wherein the first center wavelength is longer than the third center wavelength, and the third center wavelength is longer than the second center wavelength. Signal transmission device. 27. The first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is 1.48 μm band.
27. A band laser diode.
The optical signal transmission device according to claim 1. 28. A data multiplexing / combining unit for performing multiplexing / combining processing on a plurality of first serial digital data to form composite serial data, and a first multiplexing unit having the first central wavelength having a first center wavelength.
A first light-to-light conversion unit that converts the optical signal into an optical signal; a first data multiplexing unit that performs multiplexing processing on a plurality of second serial digital data to form first multiplexed serial data; A second electro-optical converter for converting the multiplexed serial data into a second optical signal having a second center wavelength different from the first center wavelength; and performing a multiplexing process on the plurality of third serial digital data. A second data multiplexing unit that forms a second multiplexed serial data by using a third central wavelength different from each of the first and second central wavelengths. A third light-to-light conversion unit that converts the light into an optical signal; and a first light-to-light conversion unit that performs multiplexing processing on two of the first, second, and third light signals to form a first multiplexed light signal. A wave section; the first multiplexed optical signal; and the first, second, and A second multiplexed optical signal is formed by performing a multiplexing process on those other than the above-mentioned two of the third optical signals, and a second multiplexed optical signal is transmitted to the optical signal transmission cable. An optical signal transmission device configured to include a multiplexing unit. 29. The composite serial data by modulating a laser beam emitted by a first laser means for emitting a laser beam having a first center wavelength according to the composite serial data. Is converted into a first optical signal, and the second electro-optical converter modulates the laser light emitted by the second laser means for emitting the laser light having the second center wavelength according to the first multiplex serial data. By doing so, the first multiplexed serial data is converted into a second optical signal, and the third electro-optical converter is emitted by third laser means for emitting laser light having a third center wavelength. 29. The optical signal according to claim 28, wherein the second multiplexed serial data is converted into a third optical signal by modulating the laser light according to the second multiplexed serial data. Feeding apparatus. 30. The light according to claim 29, wherein a state is set in which the first center wavelength is longer than the second center wavelength and the second center wavelength is longer than the third center wavelength. Signal transmission device. 31. The first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is 0.83 μm band.
31. A band laser diode.
The optical signal transmission device according to claim 1. 32. The light according to claim 29, wherein a state is set in which the first center wavelength is longer than the third center wavelength and the third center wavelength is longer than the second center wavelength. Signal transmission device. 33. The first laser means is a 1.55 μm band laser diode, the second laser means is a 1.3 μm band laser diode, and the third laser means is 1.48 μm.
33. A band laser diode.
The optical signal transmission device according to claim 1.