JP2002111583A - Optical signal transmission method and equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform bidirectional transmission using an optical fiber cable for a camera of digital video signals, obtained from plural video cameras or optical signals obtained by converting the digital video signals of another form based on them. SOLUTION: Multiplex optical signals, based on first and second optical signals obtained by E/O converting first and second serial digital data, are obtained, and they are sent out to an optical fiber 33 in the optical fiber cable 32 for the camera. Also, third optical signals, obtained by E/O converting multiplexed serial data obtained by multiplexing plural serial digital data, are sent to the optical fiber 34 in the optical fiber cable 32 for the camera. The multiplex optical signals are transmitted from the first transmitting/receiving end part of the optical fiber cable 32 for the camera through the optical fiber 33 to a second transmission/reception end part, and the third optical signals are transmitted from the second transmission/reception end part of the optical fiber cable 32 for the camera through the optical fiber 34 to the first transmission/reception end part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention described in the claims of the present application uses a signal transmission cable usually referred to as a camera fiber cable or the like which contains a plurality of optical fibers independent of each other. An optical signal transmission method for transmitting a plurality of optical signals, each based on digital video data obtained from a video camera, bidirectionally between both ends of a signal transmission cable, and an optical signal provided for implementing the method The present invention relates to a transmission device.

[0002]

2. Description of the Related Art Generally, when broadcast program information is recorded by a television broadcast station or the like, an image is taken using a plurality of video cameras. A video signal obtained from each of the plurality of video cameras passes through a camera control unit (CCU) attached to a camera unit including the plurality of video cameras, and is mounted on, for example, a vehicle (broadcast van). Sent to the relay unit.

[0003] In addition, when images are taken by a plurality of video cameras in the camera section, it is necessary for a person who operates each of the video cameras (photographer) to know the situation of imaging by another video camera.
On the image monitor provided in each video camera,
A reproduced image based on a video signal obtained from another video camera is obtained. Therefore, a video signal obtained from each video camera and sent to the relay unit via the camera control unit is subjected to predetermined processing in the relay unit, and is configured by a plurality of video cameras from the relay unit through the camera control unit. Supplied to the camera unit.

As described above, between the camera unit and the relay unit, video signals obtained from a plurality of video cameras in the camera unit are transmitted from the camera unit to the relay unit via the camera control unit, and the relay unit Is transmitted from the relay unit to the camera unit via the camera control unit, the video signal between the camera unit and the camera control unit or between the camera control unit and the relay unit Will be performed.

[0005] Video signals obtained from video cameras have been digitized in recent years from the viewpoint of diversifying transmitted information and realizing high quality reproduced images.
A video camera (digital video camera) that generates a digitized video signal, that is, a digital video signal, has been put to practical use. A digital video signal obtained from a digital video camera usually follows a standardized data format. As digital video signals conforming to such a standardized data format, HD digital video signals (HD signals), 4: 2: 2 component digital video signals (D1 signals), 4fsc composite digital video signals (D2 signals), and the like. It has been known.

[0006] Taking the HD signal out of these, the HD signal follows a data format as shown in FIG. 11, 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. 11A and color difference signal data representing a color difference signal component in the video signal as shown in FIG. 11B. 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. 11A 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) is placed. 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. 12 , 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 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 conforms to, for example, a data format as shown in FIG. In FIG.
The 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 are shown. In such parts, each of the 10
4 words (3FF0000000000
0, XYZ) are provided, and immediately after a portion corresponding to each video data period, four words (3FF, 000,000,000,000, each having a 10-bit configuration) are provided.
XYZ) is provided. 3FF and 000
Is fixed value information displayed in hexadecimal, and XYZ is 1
Variable value information displayed in hexadecimal, including field identification, field blanking period identification, and SAV
And EAV identification.

The D1 signal forming the 10-bit word string data as shown in FIG. 13 is also converted into serial digital data when transmitted.

A digital video signal obtained as an HD signal, a D1 signal, or the like as described above or a digital video signal of another format based on the digital video signal is transmitted from each of a plurality of video cameras constituting the camera unit to the camera unit and the camera control unit. For bidirectional transmission between the camera and the camera control unit and the relay unit, each digital video signal is converted to an optical signal and formed using optical fiber, which has a large transmission signal capacity and excellent transmission efficiency. Transmission over the resulting optical transmission path has been proposed. At this time, a so-called camera optical fiber cable is used to form an optical transmission path connecting the camera unit and the camera control unit or an optical transmission path connecting the camera control unit and the relay unit.

The camera optical fiber cable is a signal transmission cable incorporating a plurality of, for example, two mutually independent optical fibers, and has, for example, a cross-sectional structure as shown in FIG. In the sectional structure shown in FIG. 14, the tension member TM
Are arranged at the center, and around the tension member TM, there are four power supply lines CP, 180 spaced apart by 90 degrees.
Two control lines CC spaced apart by two degrees and two optical fibers CF spaced by 180 degrees are arranged,
These are multiply surrounded by the presser winding material HR, the shielding material SX, and the sheath ST, and have a circular shape as a whole.

Each of the two optical fibers CF in the camera optical fiber cable is, for example, a quartz single mode fiber (silica SMF).
This quartz SMF has, for example, a core diameter of 10 μm,
The cladding diameter is 125 μm, the propagation mode is one, the transmission frequency band is wide, and the propagation loss is low. Therefore, it is suitable for high-speed and long-distance communication using optical signals, and is suitable for transmitting optical signals based on digital video signals obtained from a video camera.

Such a quartz-based SMF is, for example, shown in FIG.
The optical signal is attenuated according to the attenuation characteristic shown in FIG. 5, 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.
It shows the minimum value of attenuation for light having a wavelength of μm and light having a wavelength of approximately 1.55 μm. In the dispersion characteristics shown in FIG. 16, the dispersion of light having a wavelength of about 1.3 μm is minimized.

[0019]

As described above, a digital video signal obtained from each of a plurality of video cameras constituting a camera section or a digital video signal of another type based on the digital video signal is converted into an optical signal. For bidirectional transmission between the camera unit and the camera control unit or between the camera control unit and the relay unit using the optical fiber cable for communication, the transmission between the camera unit and the camera control unit or between the camera control unit and the relay unit In between, a plurality of optical signals are provided for bidirectional transmission, and in particular, a large number of digital video signals are transmitted from the relay unit to the camera unit via the camera control unit. Therefore, according to the conventional method, an extremely large number of optical fiber cables for the camera are required between the camera unit and the camera control unit or between the camera control unit and the relay unit, respectively, which becomes large. A space for installing the cable is required, and the cost is increased.

Therefore, a digital video signal obtained from each of a plurality of video cameras constituting the camera unit or an optical signal obtained by converting a digital video signal of another format based on the digital video signal is transmitted between the camera unit and the camera control unit. There is a need for an optical signal transmission system that can efficiently perform bidirectional transmission using a camera optical fiber cable between cameras or between a camera control unit and a relay unit, in order to minimize the number of camera optical fiber cables. However, such an optical signal transmission system has not been found in the past.

In view of the above, the invention described in the claims of the present application uses a cable containing a plurality of optical fibers, such as an optical fiber cable for a camera, for example, through each of the plurality of optical fibers. A multiplexed optical signal based on a plurality of serial digital data, or an optical signal based on multiplexed serial data obtained by multiplexing a plurality of serial digital data can be transmitted bi-directionally over a cable. A digital video signal obtained from each of a plurality of video cameras constituting the camera unit or an optical signal obtained by converting a digital video signal of another format based on the digital video signal, between the camera unit and the camera control unit or the camera control unit Optical fiber for camera between the camera and the relay unit When applied to bidirectional transmission using a cable, the bidirectional transmission can be efficiently performed in order to minimize the number of optical fiber cables for a camera, and an optical signal transmission method that can efficiently perform the bidirectional transmission. Provided is an optical signal transmission device provided for performing the method.

[0022]

The optical signal transmission method according to the invention described in any one of claims 1 to 6 and claims 13 to 19 in the claims of the present application. , A first optical fiber and a second optical fiber having a first transmitting / receiving end and a second transmitting / receiving end, and connecting between the first transmitting / receiving end and the second transmitting / receiving end. Is prepared, the first serial digital data is converted into a first optical signal having a first central wavelength, and the second serial digital data is converted into a second optical signal having a second central wavelength. The first optical signal and the second optical signal are subjected to multiplexing processing to obtain a multiplexed optical signal based on them, and the multiplexed optical signal is transmitted through a first transmitting / receiving end of a cable to a first optical signal. Out to fiber optics, A multiplexing process is performed on the real digital data to obtain multiplexed serial data, which is converted into a third optical signal having a first center wavelength or a second center wavelength, and the third optical signal is transmitted through a cable. A second optical fiber is transmitted through the second transmitting / receiving end to the second optical fiber, a multiplexed optical signal is transmitted from the first transmitting / receiving end to the second transmitting / receiving end through the first optical fiber, and a third optical signal is transmitted. The signal is transmitted from the second transmitting / receiving end to the first transmitting / receiving end via the second optical fiber.

Further, the optical signal transmission apparatus according to any one of claims 7 to 12 and claims 20 to 26 in the claims of the present application is characterized in that: A cable having a transmitting / receiving end and a second transmitting / receiving end, and incorporating a first optical fiber and a second optical fiber which are independent of each other and connect between the first transmitting / receiving end and the second transmitting / receiving end. A first electro-optical converter for converting the first serial digital data into a first optical signal having a first center wavelength; and a second light converting the second serial digital data into a second light having a second center wavelength. A second light-to-light conversion unit for converting the first light signal and the second light signal into a multiplexed light signal to obtain a multiplexed light signal based on the first light signal and the second light signal; Transmission to the first optical fiber through the transmission / reception end A multiplexing unit, a data multiplexing unit that multiplexes a plurality of serial digital data to obtain multiplexed serial data, and a third optical signal having a first center wavelength or a second center wavelength. And a third light-to-light conversion unit for transmitting the third optical signal to the second optical fiber through a second transmitting / receiving end of the cable. Transmitting a third optical signal from a second transmitting / receiving end to a first transmitting / receiving end via a second optical fiber while transmitting from the transmitting / receiving end to a second transmitting / receiving end via a first optical fiber. It is said.

The optical signal transmission method according to any one of claims 1 to 6 and claims 13 to 19 in the claims of the present application, In the optical signal transmission apparatus according to any one of claims 7 to 12 and claims 20 to 26 in the claims, the first serial digital data Multiplexed light obtained by performing a multiplexing process on a first optical signal having a first center wavelength based on the second optical signal and a second optical signal having a second center wavelength based on the second serial digital data. A signal and a third optical signal having a first or second center wavelength based on the multiplexed serial data obtained by performing multiplexing processing on a plurality of serial digital data are connected by a common cable. It is sent.

At this time, the multiplexed optical signal is transmitted from the first transmitting / receiving end of the cable to the second transmitting / receiving end of the cable through the first optical fiber built into the cable, and the third optical signal is transmitted. Is transmitted from a second transmitting / receiving end of the cable to a first transmitting / receiving end of the cable through a second optical fiber built into the cable. That is, the multiplexed optical signal and the third optical signal pass through the first and second optical fibers built in the cable, respectively, and are transmitted between the first transmitting / receiving end portion and the second transmitting / receiving end portion of the cable. It is transmitted in both directions.

The optical signal transmission method or the optical signal transmission apparatus according to the invention described in the above-mentioned claims of the present invention provides, for example, a digital video signal obtained from each of a plurality of video cameras constituting a camera unit. Alternatively, bidirectional transmission of an optical signal obtained by converting a digital video signal of another type based on the optical fiber cable between the camera unit and the camera control unit or between the camera control unit and the relay unit. When applied to transmission, as a cable, a camera optical fiber cable arranged between the camera unit and the camera control unit or between the camera control unit and the relay unit is used, and the first serial digital data and The second serial digital data is the first serial digital data in the camera unit. Designated as first and second digital video signal obtained from the beauty second video camera, further,
Each of a plurality of serial digital data, which is multiplex serial data, is used as a digital video signal.

Thus, the digital video signal obtained from each of the plurality of video cameras constituting the digital camera or the optical signal obtained by converting the digital video signal of another format based on the digital video signal is converted into a digital video signal and a digital video signal. , Or between the camera control unit and the relay unit, using a camera optical fiber cable, can be efficiently performed in order to minimize the number of camera optical fiber cables.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an optical signal transmission according to any one of claims 1 to 6 and claims 13 to 19 in the claims of the present application. Claims 7 to 12 and 20 in the claims of the present application, in which an example of the method is performed.
An example of the optical signal transmission device according to the invention described in any one of (a) to (26).

In the example shown in FIG. 1, bidirectional transmission of digital video signals is performed between a camera control unit side transmitting / receiving section (CCU side transmitting / receiving section) 11 and a relay unit side transmitting / receiving section 12. CCU transmitting / receiving unit 1
A camera unit 15 formed by two video cameras 13 and 14 is connected to 1.

A serial digital video signal DVA is transmitted from the video camera 13, and a serial digital video signal DVB is transmitted from the video camera 14. Each of these serial digital video signals DVA and DVB is, for example, Y Y as shown in FIG.
HD signal multiplexing processing is 20-bit quantized digital signal obtained is subjected to form a serial digital data obtained are serialized into a data sequence and P _B / P _R data sequence, the bit transmission rate 1 .485 Gb
ps. Then, the serial digital video signals DVA and DVB obtained from the video cameras 13 and 14, respectively, are supplied to the CCU side transmitting / receiving section 11.

In the CCU side transmitting / receiving section 11, the serial digital video signal DVA from the video camera 13
Is subjected to equalization processing by the equalizer 16 to cope with attenuation by the coaxial cable forming the transmission path of the serial digital video signal DVA, and is converted into video data DVA ′, which is supplied to the waveform shaping unit 17. In the waveform shaping unit 17, the clock reproduction of the video data DVA 'is performed, and the data is recreated based on the reproduced clock to obtain the waveform-shaped video data DVA'. It is supplied to an electro-optical converter (E / O converter) 18. The E / O converter 18 performs an electro-optical conversion process on the video data DVA ′.

The E / O converter 18 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 video data D from the waveform shaping unit 17
VA ′ is supplied to the laser driving unit 19, and a laser driving signal SLDA corresponding to the video data DVA ′ is obtained from the laser driving unit 19, and 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 frequency of about 1.31 μm, for example, as shown in FIG. For example, it is about 0.4 nm / ° C. The 1.3 μm band FP laser diode 20 to which the laser drive signal SLDA has been supplied converts the 1.3 μm band laser light having a center wavelength of approximately 1.31 μm to the laser drive signal SLDA.
, With a state modulated by
An optical signal OVA having a center wavelength of approximately 1.31 μm based on the video data DVA ′ is obtained from the O-converter 18 at a bit transmission rate of 1.485 Gbps. This optical signal OVA is supplied to the multiplexing unit 21.

In the CCU transmitting / receiving section 11,
The serial digital video signal DVB from the video camera 14 is subjected to equalization processing by the equalizer 22 to cope with attenuation by the coaxial cable forming the transmission path of the serial digital video signal DVB, and the video data DVB ′
And supplied to the waveform shaping unit 23. Waveform shaping unit 23
In, the clock reproduction of the video data DVB 'is performed, and the data is re-created based on the reproduced clock to obtain the waveform-shaped video data DVB', which is subjected to the E / O conversion. It is supplied to the unit 24. The E / O converter 24 performs an electro-optical conversion process on the video data DVB '.

The E / O converter 24 includes, for example, a laser driver 25 and a 1.55 μm band distributed feedback (DFB) laser diode 26 as shown in FIG. Then, the video data DV from the waveform shaping unit 23
B ′ is supplied to the laser driving unit 25 and the laser driving unit 2
5 to the laser drive signal S corresponding to the video data DVB '
An LDB is obtained and supplied to the DFB laser diode 26 in the 1.55 μm band.

1.55 μm band DFB laser diode 2
6 oscillates in a single-wavelength mode and emits a laser beam having a center frequency of about 1.55 μm, for example, as shown in FIG.
It is about ° C. The 1.55 μm band DFB laser diode 26 to which the laser drive signal SLDB is supplied emits a 1.55 μm band laser beam having a center wavelength of about 1.55 μm in a state modulated by the laser drive signal SLDB. , An optical signal OVB having a center wavelength of about 1.55 μm based on the video data DVB ′ from the E / O converter 24 has a bit transmission rate of 1.485 Gb.
It is obtained under the condition of ps. This optical signal OVB is also supplied to the multiplexing unit 21.

The multiplexing section 21 is formed by, for example, a fiber-type WDM coupler (fiber-type WDM coupler). The multiplexing unit 21 formed by the fiber type WDM coupler is configured as shown in FIG. 6, for example.

In the configuration shown in FIG. 6, an optical signal OVA having a center wavelength of approximately 1.31 μm from the E / O converter 18 is transmitted through the optical connector 27 to the directional coupler 28.
And an optical signal OVB having a center wavelength of about 1.55 μm from the E / O converter 24 is transmitted to the optical connector 2.
Through 9, it is guided to the directional coupling unit 28. The directional coupling portion 28 is a portion where the optical fiber for guiding light through the optical connector 27 and the optical fiber for guiding light through the optical connector 29 are mutually coupled. In the directional coupling unit 28, the optical signal OV having a center wavelength of approximately 1.31 μm
A and an optical signal OVB having a center wavelength of about 1.55 μm are multiplexed and multiplexed, and a multiplexed optical signal OVM is transmitted. The multiplexed optical signal OVM obtained in the directional coupler 28 is led out through the optical connector 30.

In this manner, the multiplexed optical signal OVM derived from the multiplexing unit 21 is guided from the CCU transmitting / receiving unit 11 to the camera optical fiber cable 32 which forms an optical fiber transmission path through the optical connector 31. The optical connector 31 connects the CCU side transmitting / receiving unit 11 and the optical fiber cable 32 for a camera.

The camera optical fiber cable 32 has, for example, a cross-sectional structure as shown in FIG. 14, and incorporates two independent optical fibers 33 and 34 indicated by reference numeral CF in FIG. ing. The camera optical fiber cable 32 is
One of the two ends serves as a CCU-side transmitting / receiving end and is connected to the optical connector 31, and the other of the two ends serves as a relay unit-side transmitting / receiving end and is connected to the optical connector 35. Each of the optical fibers 33 and 34 of the book
A connection is made between the CCU-side transmitting / receiving end and the relay unit-side transmitting / receiving end. The optical connector 35 connects the camera optical fiber cable 32 and the relay unit side transmitting / receiving unit 12.

The relay unit 40 is connected to the relay unit side transmitting / receiving section 12. In the relay unit 40,
A serial data forming unit 41 is provided. The serial data forming unit 41 is obtained by serializing an HD signal obtained by a video camera and arriving through the relay unit-side transmission / reception unit 12 and another relay unit-side transmission / reception unit (not shown). A digital video signal which performs compression processing on each of a plurality of serial digital video signals having a bit transmission rate of 1.485 Gbps to form, for example, 10-bit word string data according to a data format as shown in FIG. Is obtained by serializing the D1 signal, and is mapped to an SDI (serial digital interface) for transmitting serial digital data having a bit transmission rate of 270 Mbps. The serial data forming unit 41 outputs video data DSA, DS, which are serial digital data of four channels, for example.
B, DSC and DSD, each having a bit transmission rate of 2
The transmission is performed at 70 Mbps.

The video data DSA, DSB, DSC from the serial data forming section 41 in the relay unit 40
And DSD are supplied to the data multiplexing unit 42 in the relay unit side transmitting / receiving unit 12. The data multiplexing section 42 has, for example, a specific configuration as shown in FIG.

In the specific example of the configuration of the data multiplexing unit 42 shown in FIG.
4-channel video data DSA, DS with ps
B, DSC and DSC are serial / parallel (S /
P) are supplied to the conversion units 45, 46, 47 and 48, respectively. In the S / P converter 45, the parallel digital data DPA is formed by performing S / P conversion on the video data DSA which is serial digital data having a bit transmission rate of 270 Mbps, and the parallel digital data DPA is converted into a data mapping unit. 49. Similarly, in S / P converters 46, 47 and 48, S / P conversion is applied to video data DSB, DSC and DSD, respectively, which are serial digital data having a bit transmission rate of 270 Mbps, and parallel digital data DPB, DPC and DPD are formed, and the parallel digital data DPB to DPD are supplied to the data mapping unit 49.

In the data mapping section 49, S /
Mapping processing is performed on the 4-channel parallel digital data DPA to DPD from the P conversion units 45 to 48 to set the word transmission rate to 74.25 MBps.
Multiplexed parallel data DPM as bit word string data
Is formed. The multiplexed parallel data DPM obtained from the data mapping unit 49 is parallel / serial (P /
S) The P / S conversion is performed in the conversion unit 50, and the bit transmission rate is set to 74.25 MBps × 20 = 1.485 Gbp.
s, multiplexed video data D, which is multiplexed serial data.
SM. Then, the multiplexed video data DSM obtained in the P / S conversion section 50 is transmitted from the data multiplexing section 42.

Multiplexed video data DSM whose bit transmission rate from data multiplexing section 42 is 1.485 Gbps
Is supplied to the E / O converter 51. E / O converter 51
Is configured to include, for example, a laser driving unit and a 1.3 μm band FP laser diode as in the case shown in FIG. Then, the multiplexed video data DSM is supplied to the laser driver, and the multiplexed video data DSM is supplied from the laser driver.
A laser drive signal corresponding to SM is obtained, which is 1.3.
It is supplied to the μm band FP laser diode. As a result, the 1.3 μm band FP laser diode emits a 1.3 μm band laser beam having a center wavelength of approximately 1.31 μm in a state modulated by the laser drive signal. From the multiplexed video data DSM
Signal OS having a center wavelength of approximately 1.31 μm based on
M is obtained at a bit transmission rate of 1.485 Gbps. The optical signal OSM obtained from the E / O conversion unit 51 is guided from the relay unit side transmission / reception unit 12 to the camera optical fiber cable 32 through the optical connector 35.

In the camera optical fiber cable 32, the multiplexed optical signal OVM from the multiplexing section 21 in the CCU-side transmitting / receiving section 11 is transmitted to the CC connected to the optical connector 31.
The signal is transmitted from the U-side transmitting / receiving end to one of the two optical fibers 33 and 34, for example, the optical fiber 33, to the relay unit-side transmitting / receiving end connected to the optical connector 35. E in 12
The optical signal OSM from the / O conversion unit 51 is
The CCU connected to the optical connector 31 through the other one of the two optical fibers 33 and 34, for example, the optical fiber 34 from the relay unit side transmitting / receiving end connected to the
It is transmitted to the side transmitting / receiving end. That is, the multiplexed optical signal OVM based on the serial digital video signals DVA and DVB obtained from the video cameras 13 and 14, respectively, and the 4-channel video data DSA from the serial data forming unit.
The optical signal OSM based on .about.DSD is bi-directionally transmitted between the CCU-side transmitting / receiving end of the camera optical fiber cable 32 and the relay unit-side transmitting / receiving end.

Then, in the CCU side transmitting / receiving section 11,
The center wavelength from the E / O converter 51 in the relay unit side transmitting / receiving unit 12 transmitted from the transmitting / receiving end of the optical fiber cable 32 for the camera to the transmitting / receiving end of the CCU through the optical fiber 34 is approximately 1.31 μm. The optical signal OSM sets the bit transmission rate to 1.485 G
Under the bps, the light is guided to the photoelectric conversion unit (O / E conversion unit) 55 through the optical connector 31.

In the O / E converter 55, the optical signal OS
M is subjected to photoelectric conversion, and the bit transmission rate is set to 1.48 based on the optical signal OSM having a center wavelength of about 1.31 μm.
The multiplexed video data DSM, which is multiplexed serial data of 5 Gbps, is reproduced. Then, the reproduced multiplexed video data DSM is supplied to the waveform shaping unit 56. In the waveform shaping section 56, the clock reproduction of the multiplexed video data DSM is performed, and the data is re-created based on the reproduced clock to obtain the multiplexed video data DSM 'having undergone the waveform shaping. Is supplied to the data separation unit 57. The data separation unit 57 has, for example, a specific configuration as shown in FIG.

In the specific configuration example of the data separation unit 57 shown in FIG. 8, the multiplexed video data DSM 'from the waveform shaping unit 56 is supplied to the S / P conversion unit 58. S / P
In the conversion unit 58, the multiplexed video data DSM '
/ P conversion to make the word transmission rate 74.25 MBps based on the multiplexed video data DSM ′ 20
Multiplexed parallel data DPM as bit word string data
Is obtained.

The multiplexed parallel data DPM from the S / P conversion unit 58 is supplied to a data demapping unit 59.
In the data demapping unit 59, the multiplexed parallel data DPM is subjected to a demapping process to obtain four-channel parallel digital data DPA, DPB, DPC and DPD based on the multiplexed parallel data DPM. Then, the four-channel parallel digital data DPA, DPB, DPC and DPD are supplied to the P / S converters 60, 61, 62 and 63, respectively.

In the P / S converter 60, the parallel digital data DPA is subjected to P / S conversion so that the video data DSA, which is serial digital data based on the parallel digital data DPA, has a bit transmission rate of 270 Mbps. Is obtained. Similarly, in P / S conversion sections 61, 62 and 63, each of parallel digital data DPB, DPC and DPD is subjected to P / S conversion to obtain parallel digital data DP.
Video data DSB, DSC, and DSD, which are serial digital data based on B, DPC, and DPD, are reproduced at a bit transmission rate of 270 Mbps, respectively.

In this manner, the P / S converters 60 to 63
, Each having a bit transmission rate of 2
70 Mbps serial digital data.
The four channels of video data DSA to DSD are
It is transmitted from the side transmitting / receiving section 11 and supplied to the camera section 15.

Further, in the relay unit side transmitting / receiving section 12, the multiplexing section 21 in the CCU side transmitting / receiving section 11 transmitted from the CCU side transmitting / receiving end of the camera optical fiber cable 32 through the optical fiber 33 to the relay unit side transmitting / receiving end. , An optical signal OVA having a center wavelength of about 1.31 μm and an optical signal O having a center wavelength of about 1.55 μm
The multiplexed optical signal OVM obtained by multiplexing the VB with the VB is guided to the demultiplexer 65 through the optical connector 35 under the condition that the bit transmission rate is 1.485 Gbps. Demultiplexer 65
Is, for example, a first blocking filter for light in a wavelength band including a center wavelength of about 1.55 μm and about 1.31 μm.
an optical connector through which an optical signal OVA having a center wavelength of about 1.31 μm passes, and a center filter having a center wavelength of about 1.55.
Fiber-type WDM wavelength division multiplexing couplers (fiber-type WDM couplers with built-in rejection filters), which are respectively built in optical connectors through which optical signals OVB of μm pass, are used as demultiplexing means. Such a fiber WDM coupler with a built-in rejection filter is, for example,
It is configured as shown in FIG.

In the configuration shown in FIG. 9, the multiplexed optical signal OVM through the optical connector 35 is guided to the directional coupler 67 through the optical connector 66. The directional coupling portion 67 is a portion in which an optical fiber for guiding light through the optical connector 66 is divided into two optical fibers, and the two divided optical fibers form two output ports.
The two output ports extending from the directional coupler 67 are provided with a central wavelength obtained by subjecting the multiplexed optical signal OVM to a demultiplexing process and having an optical signal OVB having a central wavelength of approximately 1.55 μm mixed by crosstalk. An optical signal OVA having a wavelength of about 1.31 μm and an optical signal OV having a center wavelength of about 1.31 μm
A is about 1.55, which is the center wavelength mixed by crosstalk.
and an optical signal OVB having a center wavelength of about 1.51 μm, and an optical signal OVB having a center wavelength of about 1.31 μm mixed with the optical signal OVB having a center wavelength of about 1.55 μm.
A is guided to the 1.55 μm blocking filter input optical connector 68, and the optical signal OVA having the center wavelength of about 1.55 μm mixed with the optical signal OVA having the center wavelength of about 1.31 μm by crosstalk is 1 .31 μm blocking filter.

1.55 μm blocking filter optical connector 6
8, an optical signal OVA having a center wavelength of approximately 1.31 μm by a built-in 1.55 μm blocking filter.
The optical signal OVB having a center wavelength of about 1.55 μm mixed therein is removed, and the optical signal OVA having a center wavelength of about 1.31 μm has a bit transmission rate of 1.485 G.
It is reproduced under the condition of bps, and is led out from the 1.55 μm blocking filter input connector 68. Also, 1.31μ
In the m-blocking filter input optical connector 69, the built-in 1.31 μm blocking filter converts an optical signal OVB having a center wavelength of approximately 1.55 μm into an optical signal OVA having a center wavelength mixed therein of approximately 1.31 μm. Is removed, and an optical signal OVB having a center wavelength of about 1.55 μm is
It is reproduced under the condition that the bit transmission rate is 1.485 Gbps, and is derived from the 1.31 μm blocking filter input optical connector 69.

According to the fiber-type WDM coupler with a built-in rejection filter shown in FIG. 9 which constitutes the demultiplexing section 65, even the optical signal having the wavelength of 1.3 μm can have the wavelength of 1.55 μm. With respect to the held optical signal, for example, isolation of 50 dB or more can be obtained.

The optical signal OVA whose center wavelength is reproduced by the demultiplexer 65 and whose center wavelength is approximately 1.31 μm, and whose center wavelength is approximately 1.31 μm.
The optical signal OVB of 55 μm is supplied to the O / E converters 70 and 71, respectively.

The O / E conversion unit 70 performs O / E conversion on the optical signal OVA having a center wavelength of approximately 1.31 μm, and performs an O / E conversion based on the optical signal OVA having a center wavelength of approximately 1.31 μm. A serial digital video signal DVA, which is serial digital data having a bit transmission rate of 1.485 Gbps, is reproduced. Then, the reproduced serial digital video signal DVA is supplied to the waveform shaping unit 72. In the waveform shaping section 72, clock recovery is performed on the serial digital video signal DVA, and data is re-created based on the recovered clock to obtain a waveform-shaped serial digital video signal DVA.

The O / E converter 71 performs O / E conversion on the optical signal OVB having a center wavelength of about 1.55 μm, thereby obtaining an optical signal OV having a center wavelength of about 1.55 μm.
A serial digital video signal DVB, which is serial digital data having a bit transmission rate of 1.485 Gbps based on B, is reproduced. Then, the reproduced serial digital video signal DVB is supplied to the waveform shaping unit 7.
3 is supplied. In the waveform shaping section 73, the clock recovery of the serial digital video signal DVB is performed, and the data is re-created based on the recovered clock to obtain the waveform-shaped serial digital video signal DVB.

In this way, the waveform shaping units 72 and 73
Serial digital video signals DVA obtained from
And DVB are transmitted from the relay unit side transmitting / receiving unit 12 and supplied to the relay unit 40.

In the example shown in FIG. 1, the serial data forming section 41 provided in the relay unit 40
, Each of which has a bit transmission rate of 270 Mbps
Video data DSA to DSD, which are serial digital data of the channel, are transmitted. In the relay unit-side transmitting / receiving section 12, the data multiplexing section 42 sets the word transmission rate based on the 4-channel video data DSA to DSD to 74.25 Mbps. Multiplexed parallel data DPM, which is 20-bit word string data, is formed and subjected to P / S conversion to increase the bit transmission rate to 1.4.
Multiplexed video data DSM of 85 Gbps is obtained,
Further, an optical signal OSM based on the multiplexed video data DSM is obtained in the E / O conversion unit 51 and transmitted to the CCU side transmission / reception unit 11 through the optical fiber 34 built in the camera optical fiber cable 32. The serial digital data transmitted from the serial data forming unit 41 provided in the relay unit 40 is the video data DSA to D of four channels.
It is not limited to SD.

For example, from the serial data forming unit 41,
Video data which is serial digital data of 6 channels each having a bit transmission rate of 270 Mbps may be transmitted. In this case, in the relay unit-side transmitting / receiving unit 12, the data multiplexing unit 42 forms multiplexed parallel data that is 20-bit word string data with a word transmission rate of 108 MBps based on 6-channel video data. P /
S conversion is performed, and the bit transmission rate is set to 108 Mbps.
The multiplexed video data of × 20 = 2.16 Gbps is obtained, and further, an optical signal based on the multiplexed video data is obtained in the E / O conversion unit 51, and the obtained optical signal is embedded in the optical fiber cable 32 for the camera. 3
4 and transmitted to the CCU side transmitting / receiving unit 11.

FIG. 10 shows another example of the optical signal transmission method according to any one of claims 1 to 6 and claims 13 to 19 in the claims of the present application. Another example of the optical signal transmission device according to any one of claims 7 to 12 and claims 20 to 26 in the claims of the present application, in which the example is implemented. Show. This example includes portions configured similarly to the example illustrated in FIG. 1, and portions corresponding to the respective portions illustrated in FIG. 1 are denoted by the same reference numerals as in FIG. 1, A detailed description thereof will be omitted.

In the example shown in FIG. 10, bidirectional transmission of digital video signals is performed between the CCU side transmitting / receiving section 81 and the relay unit side transmitting / receiving section 82. The CCU side transmitting / receiving unit 81 includes two video cameras 8
A camera section 85 formed by 3 and 84 is connected.

The serial digital video optical signal OVA is transmitted from the video camera 83, and the serial digital video optical signal OVB is transmitted from the video camera 84. These serial digital video optical signals O
Each of the VA and OVB, for example, HD signal serial 20-bit quantized digital signal obtained by multiplexing process is performed on the Y data sequence and the P _B / P _R data series as shown in FIG. 11 Serial digital data having a bit transmission rate of 1.485 Gbps obtained by conversion is converted into an optical signal, and the bit transmission rate is set to 1.485 Gbps. Then, the serial digital video optical signals OVA and OVB
Are set to have a center wavelength of about 1.31 μm, for example.

The serial digital video optical signals OVA and OVB obtained from the video cameras 83 and 84 are supplied to the CCU side transmitting / receiving section 81.

In the transmission / reception section 81 on the CCU side, the serial digital video optical signal OV
A is supplied to the O / E conversion / DC regeneration unit 86. O /
The E-conversion / DC reproduction unit 86 performs O / E conversion on the serial digital video optical signal OVA to obtain serial digital data and performs DC reproduction processing on the serial digital data to set the bit transmission rate to 1.485 Gbps. Signal DVA forming serial digital data
Get. The video signal DVA obtained from the O / E conversion / DC reproduction unit 86 is supplied to the waveform shaping unit 17. In the waveform shaping unit 17 and the subsequent E / O conversion unit 18, the same operations as those in the waveform shaping unit 17 and the E / O conversion unit 18 provided in the example shown in FIG. 1 are performed.
The optical signal OVA whose center wavelength is approximately 1.31 μm has a bit transmission rate of 1.485 Gbps from the E / O converter 18.
And supplied to the multiplexing unit 21.

The serial digital video light signal OVB from the video camera 84 is supplied to the O / E conversion / DC reproduction unit 87. In the O / E conversion / DC reproduction unit 87, the serial digital video optical signal OVB is
E-conversion is performed to obtain serial digital data, which is subjected to DC reproduction processing to obtain a video signal DVB that forms serial digital data with a bit transmission rate of 1.485 Gbps. The video signal DVB obtained from the O / E conversion / DC reproduction unit 87 is supplied to the waveform shaping unit 23. Waveform shaping section 23 and subsequent E
The I / O converter 24 performs the same operation as the waveform shaping unit 23 and the E / O converter 24 provided in the example shown in FIG. An optical signal OVB of 1.55 μm is obtained at a bit transmission rate of 1.485 Gbps and supplied to the multiplexing unit 21.

In the multiplexing unit 21, the same operation as in the multiplexing unit 21 provided in the example shown in FIG. 1 is performed, and the multiplexed optical signal OVM is derived from the multiplexing unit 21.
It is introduced from the CCU side transmitting / receiving section 81 to the camera optical fiber cable 32 forming the optical fiber transmission path through the optical connector 31 from the CCU side transmitting / receiving end. The multiplexed optical signal OVM is transmitted to the relay unit side transmission / reception end of the camera optical fiber cable 32 through the optical fiber 33 built in the camera optical fiber cable 32, and is supplied to the relay unit side transmission / reception unit 82 through the optical connector 35. Is done.

The relay unit 90 is connected to the relay unit side transmitting / receiving section 82. In the relay unit 90,
An optical serial data forming unit 91 is provided. The optical serial data forming section 91 includes the relay unit side transmitting / receiving section 8.
2. Further, a plurality of plural signals arriving through another relay unit-side transmitting / receiving unit (not shown), each of which is obtained by serializing an HD signal obtained by a video camera and has a bit transmission rate of 1.485 Gbps. The serial digital video signal is subjected to a compression process to each of them, and for example, a D1 signal which is a digital video signal forming 10-bit word string data according to a data format as shown in FIG. The optical video data OSA., Each of which is optical serial digital data, is obtained by obtaining serial digital data having a bit transmission rate of 270 Mbps and performing E / O conversion on the serial digital data. OSB, OSC and OSD
To form Then, the optical serial data forming unit 91
For example, four channels of optical video data OSA to OSD
Are transmitted with a bit transmission rate of 270 Mbps and a center wavelength of, for example, about 1.31 μm.

The optical video data OSA to OSD from the optical serial data forming section 91 in the relay unit 90 are
O / E conversion section 92 in relay unit side transmission / reception section 82
Supplied to The O / E conversion unit 92 performs O / E conversion on each of the optical video data OSA to OSD, and sets the bit rate to 270 Mbps based on the optical video data OSA to OSD.
A, DSB, DSC and DSD are formed. In this manner, the video data DSA to DSD having the bit transmission rate obtained from the O / E conversion unit 92 of 270 Mbps.
Is supplied to the data multiplexing unit 42.

In the data multiplexing section 42 and the following O / E conversion section 51, the same operations as those in the data multiplexing section 42 and the O / E conversion section 51 provided in the example shown in FIG. 1 are performed. An optical signal OSM having a center wavelength of about 1.3 μm is obtained from the O / E converter 51 under the condition that the bit transmission rate is 1.485 Gbps. And O
The optical signal OSM obtained from the / E conversion section 51 is introduced from the relay unit side transmission / reception section 82 to the camera optical fiber cable 32 through the optical connector 35 from the transmission / reception end of the relay unit side. The optical signal OSM is transmitted through the optical fiber 34 built in the camera optical fiber cable 32 to the C
The signal is transmitted to the CU-side transmitting / receiving end, and supplied to the CCU-side transmitting / receiving unit 81 through the optical connector 31.

Then, in the CCU transmitting / receiving section 81,
The center wavelength from the E / O converter 51 in the relay unit-side transmission / reception unit 82 transmitted from the relay unit-side transmission / reception end of the camera optical fiber cable 32 to the CCU-side transmission / reception end via the optical fiber 34 is approximately 1.31 μm. The optical signal OSM sets the bit transmission rate to 1.485 G
The bps is guided to the O / E converter 55 through the optical connector 31.

The O / E conversion unit 55, the waveform shaping unit 56 subsequent thereto, and the data separation unit 57 include the O / E conversion unit 55 and the waveform shaping unit 5 provided in the example shown in FIG.
6 and the data separation unit 57, the 4-channel video data DSA to DSD are obtained from the data separation unit 57, each being serial digital data having a bit transmission rate of 270 Mbps. , E / O conversion unit 93. E / O
The conversion unit 93 performs E / O conversion on each of the video data DSA to DSD, and
Each has a bit transmission rate of 270 based on the DSD.
The optical video data OSA to OSD having Mbps and a center wavelength of approximately 1.31 μm are reproduced. Thus, the optical video data OS obtained from the E / O converter 93
A to OSD are transmitted from the CCU side transmitting / receiving section 81,
It is supplied to the camera unit 85.

Further, in the relay unit-side transmitting / receiving section 82, the multiplexing section 21 in the CCU-side transmitting / receiving section 81 transmitted from the CCU-side transmitting / receiving end of the camera optical fiber cable 32 to the relay unit-side transmitting / receiving end through the optical fiber 32. , An optical signal OVA having a center wavelength of about 1.31 μm and an optical signal O having a center wavelength of about 1.55 μm
The multiplexed optical signal OVM obtained by multiplexing the VB with the VB is guided to the demultiplexer 65 through the optical connector 35 under the condition that the bit transmission rate is 1.485 Gbps. Demultiplexer 65
, The demultiplexing unit 65 provided in the example shown in FIG.
The operation similar to the above operation is performed, and the optical signal OVA having the center wavelength of about 1.31 μm and the center wavelength of about 1.31 μm are performed.
An optical signal OVB of 55 μm is reproduced.

The optical signals OVA and OVB obtained from the demultiplexing section 65 are supplied to O / E conversion / DC regeneration sections 94 and 95, respectively.

In the O / E conversion / DC regeneration unit 94,
The O / E conversion is performed on the optical signal OVA to obtain serial digital data, and the DC signal is subjected to a DC regeneration process.
A video signal DVA forming serial digital data with a bit transmission rate of 1.485 Gbps is obtained.
The video signal DVA obtained from the O / E conversion / DC reproduction unit 94 is supplied to the waveform shaping unit 72. Waveform playback unit 7
2, the same operation as the operation of the waveform shaping unit 72 provided in the example shown in FIG. 1 is performed to obtain a waveform-shaped optical signal DVA, which is subjected to E / O conversion. It is supplied to the unit 96.

The E / O conversion section 96 performs E / O conversion on the video data DVA and outputs the video data DVA.
Based on A, a serial digital video optical signal OVA having a bit transmission rate of 1.485 Gbps and a center wavelength of about 1.31 μm is reproduced.

In the O / E conversion / DC reproduction section 95, the optical signal OVB is subjected to O / E conversion to obtain serial digital data, and is subjected to DC reproduction processing to reduce the bit transmission rate. A video signal DVB forming serial digital data of 1.485 Gbps is obtained. The video signal DVB obtained from the O / E conversion / DC reproduction unit 95 is supplied to the waveform shaping unit 73. In the waveform reproducing unit 73, the same operation as the operation of the waveform shaping unit 73 provided in the example shown in FIG. 1 is performed, and a waveform-shaped optical signal DVB is obtained. / O
It is supplied to the conversion unit 97.

The E / O conversion section 97 performs E / O conversion on the video data DVB and outputs the video data DVB.
Based on B, a serial digital video optical signal OVB having a bit transmission rate of 1.485 Gbps and a center wavelength of about 1.31 μm is reproduced.

The serial digital video optical signal O having the center wavelength of about 1.31 μm reproduced in this manner is reproduced.
The VA and the serial digital video optical signal OVB having a center wavelength of about 1.31 μm are transmitted from the relay unit side transmitting / receiving section 82 and supplied to the relay unit 90.

In the example shown in FIG. 10, the optical serial data forming unit 9 provided in the relay unit 90
1 each have a bit transmission rate of 270 Mbps,
Optical video data OSA to 4 channel optical serial digital data having a center wavelength of about 1.31 μm.
The transmission / reception unit 82 transmits the OSD.
ＯＳOSD is subjected to O / E conversion, and an optical signal OSM is obtained based on multiplexed video data DSM formed by multiplexing video data DSAＳＤDSD obtained from the multiplexed video data DSA〜DSD. The optical serial digital data transmitted from the optical serial data forming section 91 provided in the relay unit 90 is transmitted to the CCU side transmitting / receiving section 81 through the optical fiber 34. OS
It is not limited to A to OSD.

For example, the optical serial data forming section 91 transmits optical video data, which is 6-channel optical serial digital data, each having a bit transmission rate of 270 Mbps and a center wavelength of about 1.31 μm. May be done. At this time, in the relay unit side transmitting / receiving section 82, the E / O conversion section 51
An optical signal based on the multiplexed video data formed by multiplexing the 6-channel video data obtained by performing O / E conversion on the optical video data of the channel is obtained, which is built into the optical fiber cable 32 for the camera. Is transmitted to the CCU side transmission / reception unit 81 via the optical fiber 34 that has been used.

[0084]

As is apparent from the above description, the light according to the invention described in any one of claims 1 to 6 and claims 13 to 19 in the claims of the present application. According to the signal transmission method or the optical signal transmission device according to any one of claims 7 to 12 and claims 20 to 26 in the claims of the present application, Combining a first optical signal having a first center wavelength based on the first serial digital data with a second optical signal having a second center wavelength based on the second serial digital data; The multiplexed optical signal obtained by performing the multiplexing process and the third optical signal having the first or second center wavelength based on the multiplexed serial data obtained by performing the multiplexing process on the plurality of serial digital data are shared. It is transmitted by the cable.

At this time, the multiplexed optical signal is transmitted from the first transmitting / receiving end of the cable to the second transmitting / receiving end of the cable through the first optical fiber built in the cable, and the third optical signal is transmitted. Is transmitted from a second transmitting / receiving end of the cable to a first transmitting / receiving end of the cable through a second optical fiber built in the cable, and the multiplexed optical signal and the third optical signal are built in the cable. The data is transmitted bidirectionally between the first transmitting / receiving end and the second transmitting / receiving end of the cable through the first and second optical fibers respectively.

The optical signal transmission method or the optical signal transmission apparatus according to the invention described in the above-mentioned claims of the present invention provides, for example, a digital video signal obtained from each of a plurality of video cameras constituting a camera unit. Alternatively, bidirectional transmission of an optical signal obtained by converting a digital video signal of another type based on the optical fiber cable between the camera unit and the camera control unit or between the camera control unit and the relay unit. When applied to transmission, an optical fiber cable for a camera disposed between the camera unit and the camera control unit or between the camera control unit and the relay unit is used as the cable, and the first serial digital data and The second serial digital data is transmitted to the And it designated as first and second digital video signal obtained from the second video camera, further, each of the plurality of serial digital data that is multiplexed serial data is a digital video signal. As a result, a digital video signal obtained from each of the plurality of video cameras constituting the camera unit or an optical signal obtained by converting a digital video signal of another format based on the digital video signal is transmitted between the camera unit and the camera control unit or Bidirectional transmission using the camera optical fiber cable between the camera control unit and the relay unit can be efficiently performed in order to minimize the number of camera optical fiber cables.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an optical signal transmission method according to the invention described in any one of claims 1 to 6 and claims 13 to 19 in the claims of the present application. Claim 7 in the claims of the present application
FIG. 21 is a block connection diagram showing an example of an optical signal transmission device according to the invention described in any one of (1) to (12) and (20) to (26).

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

FIG. 3 is a characteristic diagram for explaining a 1.3 μm band FP laser diode used in the specific configuration example of FIG. 2;

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

FIG. 5 shows 1.55 μm used in the specific configuration example of FIG.
FIG. 4 is a characteristic diagram used for describing a band DFB laser diode.

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

FIG. 7 is a block diagram showing a specific configuration example of a data multiplexing unit used in the example shown in FIG. 1;

FIG. 8 is a block diagram showing a specific configuration example of a data separation unit used in the example shown in FIG. 1;

FIG. 9 is a block diagram showing a specific configuration example of a demultiplexer used in the example shown in FIG. 1;

FIG. 10 is a diagram showing another example of the optical signal transmission method according to the invention described in any one of claims 1 to 6 and claims 13 to 19 in the claims of the present application. Claims 7 to 12 and Claims 20 to 26 in the claims of the present application.
FIG. 13 is a block connection diagram showing another example of the optical signal transmission device according to any one of the inventions described above.

FIG. 11 is a time chart showing a data format of a Y data sequence and a P _B / P _R data sequence forming a digital video signal.

FIG. 12 is a time chart showing a data format of a word multiplex data sequence forming a digital video signal.

FIG. 13 is a time chart showing a data format of a digital video signal.

FIG. 14 is a cross-sectional view illustrating a cross-sectional structure of a camera optical fiber cable.

FIG. 15 is a characteristic diagram showing an attenuation characteristic of a quartz-based SMF.

FIG. 16 is a characteristic diagram showing dispersion characteristics of a quartz-based SMF.

[Explanation of symbols]

······································································· 81 81
· Relay unit side transmission / reception section, 13, 14, 83, 84 ·
..Video cameras, 15, 85 ... camera units, 1
6,22 ... Equalizer, 17,23,56,72,7
3: Waveform shaping unit, 18, 24, 51, 93, 9
6, 97: E / O converter, 19, 25: laser driver, 20: 1.3 μm FP laser diode, 21: multiplexing part, 26: 1.55 μm
Band DFB laser diode, 27, 29, 30, 3
1, 35, 66 ... optical connector, 32 ... optical fiber cable for camera, 33, 34 ... optical fiber, 40, 90 ... relay unit, 41 ...
Serial data forming unit, 42 ... data multiplexing unit, 4
5, 46, 47, 48, 58 S / P converter, 4
9 Data mapping unit, 50, 60, 61, 6
2, 63... P / S converter, 55, 70, 71, 9
2 ... O / E conversion unit, 57 ... Data separation unit,
59: Data demapping unit, 65: Demultiplexing unit, 86, 87, 94, 95: O / E conversion / DC regeneration unit, 91: Optical serial data forming unit

Claims (26)

[Claims] A first optical fiber having a first transmitting / receiving end and a second transmitting / receiving end, and independent from each other, connecting between the first transmitting / receiving end and the second transmitting / receiving end. A cable incorporating a second optical fiber is prepared. The first serial digital data is converted into a first optical signal having a first center wavelength, and the second serial digital data is converted into a second center wavelength. The first optical signal and the second optical signal are subjected to multiplexing processing to obtain a multiplexed optical signal based on the first and second optical signals. A signal is transmitted to the first optical fiber through the first transmitting / receiving end of the cable, and a multiplexing process is performed on a plurality of serial digital data to obtain multiplexed serial data. The center wavelength of the second or Converting the third optical signal to a second optical fiber through the second transmitting / receiving end of the cable, and converting the multiplexed optical signal to the third optical signal. And transmitting the third optical signal from the second transmitting / receiving end through the second optical fiber to the first transmitting / receiving end through the first optical fiber to the second transmitting / receiving end. An optical signal transmission method for transmitting to the transmitting / receiving end. 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. 1 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. 2. The optical signal transmission method according to claim 1, wherein the digital data is converted into a second optical signal. 3. The method according to claim 2, wherein the first laser means is a 1.3 μm band Fabry-Perot type laser diode, and the second laser means is a 1.55 μm band distributed feedback laser diode. Optical signal transmission method. 4. The optical system according to claim 1, wherein the first optical signal and the second optical signal are subjected to multiplexing processing using a fiber type wavelength multiplexing coupler as multiplexing means. The optical signal transmission method according to any one of the above. 5. The multiplex serial data is modulated by modulating a laser beam emitted by a third laser means for emitting a laser beam having a first center wavelength or a second center wavelength according to the multiplex serial data. The optical signal transmission method according to any one of claims 1 to 4, wherein the optical signal is converted into an optical signal (3). 6. An optical signal transmission method according to claim 5, wherein said third laser means is a 1.3 μm band Fabry-Perot laser diode. 7. An independent first optical fiber having a first transmitting / receiving end and a second transmitting / receiving end, and connecting between the first transmitting / receiving end and the second transmitting / receiving end. A cable incorporating a second optical fiber; a first electro-optical converter for converting the first serial digital data into a first optical signal having a first center wavelength; A second light-to-light conversion unit that converts the first light signal and the second light signal into a second light signal having a center wavelength of the first and second light signals. A multiplexing unit for transmitting the multiplexed optical signal to the first optical fiber through the first transmitting / receiving end of the cable, and multiplexing the plurality of serial digital data. A data multiplexing unit for obtaining multiplexed serial data by The multiplex serial data is converted into a third optical signal having the first center wavelength or the second center wavelength, and the third optical signal is transmitted through the second transmitting / receiving end of the cable to the second optical signal. And a third light-to-light converter for transmitting the multiplexed optical signal from the first transmitting / receiving end to the second transmitting / receiving end through the first optical fiber. An optical signal transmission device for transmitting the third optical signal from the second transmitting / receiving end to the first transmitting / receiving end through the second optical fiber. 8. A method according to claim 1, wherein the first light-to-light converter modulates the laser light emitted by the first laser means for emitting the laser light having the first center wavelength in accordance with the first serial digital data. While converting the first serial digital data into a first optical signal, 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 optical signal. By modulating according to serial digital data,
8. The optical signal transmission device according to claim 7, wherein said second serial digital data is converted into a second optical signal. 9. The method according to claim 8, wherein said first laser means is a Fabry-Perot laser diode in a 1.3 μm band, and said second laser means is a distributed feedback laser diode in a 1.55 μm band. Optical signal transmission equipment. 10. The multiplexing section uses a fiber-type wavelength division multiplexing coupler as multiplexing means for performing multiplexing processing on the first optical signal and the second optical signal. The optical signal transmission device according to any one of the above. 11. A third light-to-light conversion unit modulates a laser beam emitted by a third laser unit for emitting a laser beam having a first center wavelength or a second center wavelength in accordance with multiplexed serial data. The optical signal transmission device according to any one of claims 7 to 10, wherein the multiplexed serial data is converted into a third optical signal. 12. An optical signal transmission apparatus according to claim 11, wherein said third laser means is a 1.3 μm band Fabry-Perot laser diode. 13. An independent first optical fiber having a first transmitting / receiving end and a second transmitting / receiving end, and connecting between the first transmitting / receiving end and the second transmitting / receiving end. A cable incorporating a second optical fiber is prepared. The first serial digital data is converted into a first optical signal having a first center wavelength, and the second serial digital data is converted into a second center wavelength. The first optical signal and the second optical signal are subjected to multiplexing processing to obtain a multiplexed optical signal based on the first and second optical signals. Transmitting a signal to the first optical fiber through the first transmitting / receiving end of the cable and receiving a multiplexed optical signal transmitted through the first optical fiber and arriving at the second transmitting / receiving end; Demultiplexing the transmitted multiplexed optical signal Obtaining a first reproduced optical signal having the first central wavelength and a second reproduced optical signal having the second central wavelength, and converting the first reproduced optical signal into first reproduced serial digital data; And converting the second reproduced optical signal into second reproduced serial digital data, performing multiplexing processing on the plurality of serial digital data to obtain multiplexed serial data, and converting the multiplexed serial data into the first center data. Converting the third optical signal into a third optical signal having a wavelength or a second center wavelength, and transmitting the third optical signal to the second optical fiber through the second transmitting / receiving end of the cable; Receiving the third optical signal transmitted through the second optical fiber and arriving at the first transmitting / receiving end, converting the transmitted third optical signal into reproduced multiplexed serial data, Subjected to separation treatment to raw multiplexed serial data to obtain a plurality of reproduced serial digital data, optical signal transmission method. 14. 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. 1 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. 14. The optical signal transmission method according to claim 13, wherein the digital data is converted into a second optical signal. 15. A laser diode according to claim 14, wherein said first laser means is a Fabry-Perot laser diode in a 1.3 μm band, and said second laser means is a distributed feedback laser diode in a 1.55 μm band. Optical signal transmission method. 16. The optical system according to claim 13, wherein the first optical signal and the second optical signal are subjected to multiplexing processing using a fiber-type wavelength multiplexing coupler as multiplexing means.
6. The optical signal transmission method according to any one of 5 to 5. 17. A multiplexed optical signal transmitted through a first optical fiber and arriving at a second transmitting / receiving end is subjected to a demultiplexing process using a fiber type wavelength division multiplexing coupler as a demultiplexing means. 17. The optical signal transmission method according to claim 13, wherein first and second reproduced optical signals based on the multiplexed optical signal transmitted through the optical fiber are obtained. 18. The multiplexed serial data is modulated by modulating a laser beam emitted by a third laser means for emitting a laser beam having a first center wavelength or a second center wavelength according to the multiplexed serial data. 18. The optical signal according to claim 13, wherein the optical signal is converted into a third optical signal.
The optical signal transmission method according to any one of the above. 19. An optical signal transmission method according to claim 18, wherein said third laser means is a 1.3 μm band Fabry-Perot laser diode. 20. An independent first optical fiber having a first transmitting / receiving end and a second transmitting / receiving end, and connecting between the first transmitting / receiving end and the second transmitting / receiving end. A cable incorporating a second optical fiber; a first electro-optical converter for converting the first serial digital data into a first optical signal having a first center wavelength; A second light-to-light conversion unit that converts the first light signal and the second light signal into a second light signal having a center wavelength of the first and second light signals. And a multiplexing unit for transmitting the multiplexed optical signal to the first optical fiber through the first transmitting / receiving end of the cable, and transmitting the multiplexed optical signal to the first optical fiber via the first optical fiber. 2 receives the multiplexed optical signal arriving at the transmitting / receiving end, and A demultiplexing unit that performs demultiplexing processing on the transmitted multiplexed optical signal to obtain a first reproduced optical signal having the first central wavelength and a second reproduced optical signal having the second central wavelength; A first photoelectric converter for converting the first reproduced optical signal into first reproduced serial digital data, and a second photoelectric converter for converting the second reproduced optical signal into second reproduced serial digital data A data multiplexing unit that performs multiplexing processing on a plurality of serial digital data to obtain multiplexed serial data; and converts the multiplexed serial data into a third optical signal having the first center wavelength or the second center wavelength. And a third light-to-light conversion unit for transmitting the third optical signal to the second optical fiber through the second transmitting / receiving end of the cable; and transmitting the third optical signal through the second optical fiber and transmitting the third optical signal to the second optical fiber. A third photoelectric conversion unit for receiving the third optical signal arriving at the transmitting / receiving end of the third optical signal and converting the transmitted third optical signal into reproduced multiplexed serial data; And a data separating unit for obtaining a plurality of reproduced serial digital data. 21. A first electro-optical converter 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. While converting the first serial digital data into a first optical signal, 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 optical signal. 21. The optical signal transmission device according to claim 20, wherein the second serial digital data is converted into a second optical signal by modulating according to the serial digital data. 22. The method according to claim 21, wherein the first laser means is a 1.3 μm band Fabry-Perot laser diode and the second laser means is a 1.55 μm band distributed feedback laser diode. Optical signal transmission equipment. 23. The multiplexing section according to claim 20, wherein the multiplexing means uses a fiber-type wavelength multiplexing coupler as multiplexing means for performing multiplexing processing on the first optical signal and the second optical signal. The optical signal transmission device according to any one of the above. 24. The demultiplexing unit according to claim 20, wherein the demultiplexing unit uses a fiber type wavelength division multiplexing coupler as demultiplexing means for demultiplexing the transmitted multiplexed optical signal.
The optical signal transmission device according to any one of the above. 25. A third light-to-light converter for modulating laser light emitted by third laser means for emitting laser light having a first center wavelength or a second center wavelength in accordance with multiplex serial data. The optical signal transmission device according to any one of claims 20 to 24, wherein the multiplexed serial data is converted into a third optical signal by a third optical signal. 26. An optical signal transmission apparatus according to claim 25, wherein said third laser means is a 1.3 μm band Fabry-Perot laser diode.