JP2002125218A - 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 in two-way an optical signal resulting from converting a digital video signal obtained from video cameras or a digital video signal of other form obtained based on the digital video signals by using a camera use optical fiber cable. SOLUTION: The system of this invention transmits a 1st optical signal resulting from applying bit multiplex synthesis processing and then applying E/O conversion to a plurality of 1st serial digital data to an optical fiber 32 in the camera use optical fiber cable 31, transmits a 2nd optical signal resulting from multiplexing the serial digital data as multiplexed serial data and applying E/O conversion to the multiplexed serial data to an optical fiber 33 in the camera use optical fiber cable 31, transmits the 1st optical signal from a 1st transmission/reception end of the camera use optical fiber cable 31 to a 2nd transmission/reception end through the optical fiber 32 and transmits the 2nd optical signal from the 2nd transmission/reception end of the camera use optical fiber cable 31 to the 1st transmission/reception end through the optical fiber 33.

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 called a camera fiber cable or the like, in which a plurality of optical fibers independent of each other are built in. An optical signal transmission method for bidirectionally transmitting a plurality of optical signals based on digital data each forming a video signal obtained from a video camera or other types of digital data based thereon, between both ends of a signal transmission cable; Further, the present invention relates to an optical signal transmission device provided for implementing such a method.

[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. Then, video signals obtained from each of the plurality of video cameras pass through a camera control unit (CCU) attached to a camera unit composed of the plurality of video cameras, and are 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 is generally formed of digital data according to a standardized data format. As digital video signals formed by digital data according to such a standardized data format, HD digital video signals (HD signals), 4: 2: 2 component digital video signals (D1 signals), and 4fsc composite digital video A signal (D2 signal) and the like are known.

[0006] Taking the HD signal out of these, the HD signal is formed of, for example, digital data according to a data format as shown in FIG.

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. 15A and color difference signal data representing a color difference signal component in the video signal as shown in FIG. 15B 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. 15A shows a line blanking period in each line period of 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: End of
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, and 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, for example, in the Y data sequence and P _B / P _R data sequence, line blanking each of EAV and SAV are arranged The word multiplexing process is performed under the condition that the portions corresponding to the periods are synchronized, and FIG.
6 is 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 is formed, for example, by digital data according to a data format as shown in FIG. FIG. 17 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 four 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 is variable value information displayed in hexadecimal and includes field identification, field blanking period identification, and SAV and EAV identification. Show.

The D1 signal formed by such 10-bit word string data as shown in FIG. 17 is also converted into serial digital data when transmitted.

From each of the plurality of video cameras constituting the camera section, digital data forming a digital video signal obtained as an HD signal, a D1 signal, or the like as described above, or digital data of another format based on the digital data is transmitted to the camera section. For bi-directional transmission between the camera control unit and the camera control unit and the relay unit, each digital data is converted into an optical signal and formed using an optical fiber, and the transmission signal capacity is large and excellent. It has been proposed to transmit the light through an optical transmission line that provides transmission efficiency. 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 sectional structure as shown in FIG. In the sectional structure shown in FIG. 18, 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. 9 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 addition, in the dispersion characteristics shown in FIG. 20, the dispersion of light having a wavelength of about 1.3 μm is minimized.

[0019]

As described above, digital data forming a digital video signal obtained from each of a plurality of video cameras constituting a camera section or digital data of another type based thereon is converted into an optical signal. After conversion, using the optical fiber cable for the camera,
In bidirectional transmission between the camera unit and the camera control unit or between the camera control unit and the relay unit, a plurality of transmissions are performed between the camera unit and the camera control unit or between the camera control unit and the relay unit. The optical signal is subjected to bidirectional transmission. 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, the camera unit and the camera unit of the optical signal obtained by converting the digital data forming the digital video signal obtained from each of the plurality of video cameras constituting the camera unit or other types of digital data based thereon are converted. An optical signal transmission system capable of efficiently performing bi-directional transmission using a camera optical fiber cable between a control unit or a camera control unit and a relay unit to minimize the number of camera optical fiber cables. As desired, 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 bidirectionally over a cable. Between the camera unit and the camera control unit of the optical signal obtained by converting the digital data forming the digital video signal obtained from each of the plurality of video cameras constituting the camera unit or other types of digital data based thereon; Or between the camera control unit and the relay unit. That when applied to bidirectional transmission of using the camera optical fiber cable, the two-way transmission, in order to suppress the camera optical fiber cables to minimize the number, the optical signal transmission method will be performed efficiently,
Also, an optical signal transmission device provided for implementing such a method is provided.

[0022]

An optical signal transmission method according to the invention described in any one of claims 1 to 7 and claims 17 to 23 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, a bit multiplexing / combining process is performed on the first plurality of serial digital data to form composite serial data, which is converted into a first optical signal, and the first optical signal is Outgoing to the first optical fiber through a first transmitting / receiving end of the cable;
Multiplexing the plurality of serial digital data to obtain multiplexed serial data, converting the multiplexed serial data into a second optical signal, and transmitting the second optical signal through a second transmitting / receiving end of the cable to a second optical signal. The first optical signal is transmitted from the first transmitting / receiving end to the second transmitting / receiving end through the first optical fiber, and the second optical signal is transmitted from the second transmitting / receiving end to the optical fiber. The signal is transmitted to the first transmitting / receiving end through the second optical fiber.

The optical signal transmission method according to any one of claims 8 to 14 and claims 24 to 31 in the claims of the present application provides the first method. 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. And performs bit multiplexing / combining processing on the first plurality of serial digital data to form first composite serial data, and performs bit multiplexing / combining processing on the second plurality of serial digital data to obtain a second composite serial data. Forming the composite serial data, converting the first composite serial data into a first optical signal having a first center wavelength, and converting the second composite serial data into a second optical signal having a second center wavelength. Into a No., the first optical signal and the second
Multiplexing the optical signals to obtain a multiplexed optical signal based on the first and second optical signals, and send the multiplexed optical signal to the first optical fiber through a first transmitting / receiving end of the cable; Also, multiplexing is performed on the third plurality of serial 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 Transmitting the optical signal of No. 3 to the second optical fiber through the second transmitting / receiving end of the cable, transmitting the multiplexed optical signal from the first transmitting / receiving end to the second transmitting / receiving end through the first optical fiber, , Third
Is transmitted from the second transmitting / receiving end to the first transmitting / receiving end through the second optical fiber.

Further, the optical signal transmission device according to the invention described in claim 15 or claim 32 of the present application has a first transmitting / receiving end portion and a second transmitting / receiving end portion, A cable containing a first optical fiber and a second optical fiber, which are independent from each other, connecting the first transmitting / receiving end and the second transmitting / receiving end, and performing bit multiplexing / combining processing on the first plurality of serial digital data And a bit multiplexing unit that forms the composite serial data by converting the composite serial data into a first optical signal, and converts the first optical signal to a first optical fiber through a first transmitting / receiving end of the cable. A first electro-optical conversion section for transmitting, a data multiplexing section for performing multiplexing processing on a second plurality of serial digital data to obtain multiplexed serial data, and a second
And a second optical-to-optical converter for transmitting the second optical signal to the second optical fiber through the second transmitting / receiving end of the cable. A signal is transmitted from the first transmitting / receiving end through the first optical fiber to the second transmitting / receiving end, and a second optical signal is transmitted from the second transmitting / receiving end through the second optical fiber to the first optical fiber.
Is transmitted to the transmission / reception end section.

The optical signal transmission apparatus according to the invention described in claim 16 or claim 33 of the present application has a first transmitting / receiving end and a second transmitting / receiving end, A cable containing a first optical fiber and a second optical fiber that are independent of each other and that connects a first transmitting / receiving end portion and a second transmitting / receiving end portion, and a bit multiplexing / combining process on a first plurality of serial digital data And a second bit multiplexing unit that forms the first composite serial data by performing a bit multiplexing / combining process on the second plurality of serial digital data to form second composite serial data. A first electro-optical converter for converting the first composite serial data into a first optical signal having a first center wavelength; and a second electro-optical converter for converting the second composite serial data into a second optical signal having a second center wavelength. Convert to optical signal A second optical-to-optical converter, and a multiplexing process on the first optical signal and the second optical signal to obtain a multiplexed optical signal based on the first and second optical signals. A multiplexing unit for transmitting to the first optical fiber through the first transmitting / receiving end unit, a data multiplexing unit that multiplexes the third plurality of serial digital data to obtain multiplexed serial data, First
A third optical signal having a center wavelength or a second center wavelength, and transmitting the third optical signal to a second optical fiber through a second transmitting / receiving end of the cable. And transmitting a multiplexed optical signal from the first transmitting / receiving end to the second transmitting / receiving end through the first optical fiber, and transmitting a third optical signal from the second transmitting / receiving end. The signal is transmitted to the first transmitting / receiving end through a second optical fiber.

The optical signal transmission method according to any one of claims 1 to 7 and claims 17 to 23 in the claims of the present application as described above, or In the optical signal transmission apparatus according to the invention described in claim 15 or claim 32 of the present application, a composite obtained by performing bit multiplexing and combining processing on a first plurality of serial digital data. A first optical signal based on serial data and a second optical signal based on multiplexed serial data obtained by performing multiplexing processing on a second plurality of serial digital data are transmitted by a common cable.

At this time, the first 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 An optical signal 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 first optical signal and the third optical signal are:
The signal 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 incorporated in the cable, respectively.

The optical signal transmission method or the optical signal transmission device 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. Of the optical signal obtained by converting the digital data forming the digital data or other types of digital data based on the digital data, using a camera 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 all bidirectional transmissions, a camera optical fiber cable disposed between a camera unit and a camera control unit or between a camera control unit and a relay unit is used as a cable. Multiple serial digital data is stored in multiple video cameras in the camera section. From the the digital data forming a respective plurality of digital video signals obtained, further, s the second plurality of serial digital data each being a multiple serial data is a digital data forming the digital video signal.

As a result, the digital signal forming the digital video signal obtained from each of the plurality of video cameras constituting the camera section or the optical signal obtained by converting the digital data of another format based on the digital data is used.
Efficient bidirectional transmission between the camera unit and the camera control unit or between the camera control unit and the relay unit using the camera optical fiber cable to minimize the number of camera optical fiber cables become.

Similarly, the optical signal transmission method according to any one of claims 8 to 14 and claims 24 to 31 in the claims of the present application, or the present invention In the optical signal transmission apparatus according to claim 16 or claim 33 of the present invention, the first plurality of serial digital data are subjected to bit multiplexing / combining processing to obtain the first plurality of serial digital data. A first optical signal having a first center wavelength based on the composite serial data and a second composite serial data obtained by subjecting the second plurality of serial digital data to bit multiplexing / combining processing. A multiplexed optical signal obtained by subjecting a second optical signal having a center wavelength of
A third optical signal having a first or second center wavelength based on multiplexed serial data obtained by performing multiplexing processing on a third plurality of serial digital data is transmitted by a common cable. .

At this time, a multiplexed optical signal obtained by performing a multiplexing process on the first optical signal and the second optical signal is transmitted from a first transmitting / receiving end of the cable to a first optical signal embedded in the cable. A third optical signal is transmitted through the optical fiber to a second transmitting / receiving end of the cable, and a third optical signal is transmitted from the second transmitting / receiving end of the cable through a second optical fiber built into the cable to the first transmitting / receiving end of the cable. Transmitted to the department. 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 the first transmitting / receiving end of the cable and the second optical signal are connected to the second optical fiber.
Is transmitted bidirectionally between the transmitting and receiving ends.

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. The optical signal obtained by converting the digital data forming the digital data or the other type of digital data based on the digital data, using a camera 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 all bidirectional transmissions, a camera optical fiber cable arranged between a camera unit and a camera control unit or between a camera control unit and a relay unit is used as a cable. A plurality of serial digital data and a second plurality of serial digital data; Are digital data forming a plurality of digital video signals respectively obtained from a plurality of video cameras in the camera unit. Further, each of the third plurality of serial digital data, which is multiplexed serial data, converts the digital video signal. Digital data to be formed.

Thus, the digital signal forming the digital video signal obtained from each of the plurality of video cameras constituting the camera unit or the optical signal obtained by converting the digital data of another format based on the digital data is obtained.
Efficient bidirectional transmission between the camera unit and the camera control unit or between the camera control unit and the relay unit using the camera optical fiber cable to minimize the number of camera optical fiber cables become.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an optical signal transmission according to any one of claims 1 to 7 and claims 17 to 23 of the present application. An example of the optical signal transmission device according to the invention described in claim 15 or claim 32 in the claims of the present application, in which an example of the method is performed, is shown.

In the example shown in FIG. 1, bidirectional transmission of a digital video signal 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.
Data series and P _B / P HD signal multiplexing processing on the _R data series is 20-bit quantized digital signal obtained is subjected is formed by a serial digital data obtained is serialized, the bit transmission rate 1 .4
It is assumed to be 85 Gbps. 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 re-created based on the reproduced clock. The waveform-shaped video data DVA' has a bit transmission rate. 1.485 Gbp
s, which is supplied to the bit multiplexing unit 18.

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 19 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 20. Waveform shaping unit 20
In, the clock reproduction of the video data DVB 'is performed, the data is re-created based on the reproduced clock, and the waveform-shaped video data DVB' has a bit transmission rate of 1.485G.
bps, which is the bit multiplexing unit 1
8 is supplied.

The bit multiplexing unit 18 is constituted by using, for example, a two-bit multiplexer, and alternately assigns one bit to each of the video data DVA 'from the waveform shaping unit 17 and the video data DVB' from the waveform shaping unit 20. The video data DVA 'and the video data DVB' are 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, the composite serial data DVM obtained from the bit multiplexing unit 18 is supplied to the electro-optical conversion unit (E / O conversion unit) 21. The E / O conversion unit 21 is configured to output the composite serial data DVM
Is subjected to light-to-light conversion processing to increase the bit transmission rate to 2.97 G
bps, for example, approximately 1.31 μm or 1.55
An optical signal OVM having a center wavelength of μm is formed.

An example of the E / O converter 21 is, as shown in FIG. 2, for example, a laser driver 22 and 1.3.
μm-band Fabry-Perot (FP) laser diode 23
And is provided. Then, the composite serial data DVM from the bit multiplexing unit 18 is supplied to the laser driving unit 22, and the composite serial data DV
A laser drive signal SLD corresponding to M is obtained and supplied to the 1.3 μm band FP laser diode 23.

1.3 μm band FP laser diode 23
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 23 supplied with the laser drive signal SLD 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 SLD. , E / O converter 21, an optical signal OVM having a center wavelength of approximately 1.31 μm based on the composite serial data DVM is obtained at a bit transmission rate of 2.97 Gbps.

Another example of the E / O converter 21 is, for example, as shown in FIG.
And a 5 μm band distributed feedback (DFB) laser diode 26. Then, the composite serial data DVM from the bit multiplexing unit 18 is supplied to the laser driver 25, and the composite serial data DVM is supplied from the laser driver 25.
Is obtained, and the laser drive signal SLD corresponding to 1.
It is supplied to a 55 μm band DFB laser diode 26.

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. 1. The laser drive signal SLD is supplied.
The 55 μm band DFB laser diode 26 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 SLD. An optical signal OVM having a center wavelength of about 1.55 μm based on the data DVM has a bit transmission rate of 2.97 Gbps.
Is obtained.

An optical signal OVM having a center wavelength of about 1.31 μm or 1.55 μm obtained in the E / O conversion section 21 is transmitted from the CCU side transmission / reception section 11 through the optical connector 30 to an optical fiber cable for a camera. It is led to 31. The optical connector 30 is CC
U-side transmitting / receiving unit 11 and optical fiber cable 31 for camera
And are connected.

The camera optical fiber cable 31 has, for example, a cross-sectional structure as shown in FIG. 18, and incorporates two independent optical fibers 32 and 33 indicated by the reference numeral CF in FIG. ing. And the optical fiber cable 31 for the camera is
One of the two ends is connected to the optical connector 30 as a CCU-side transmitting / receiving end, and the other of the two ends is connected to the optical connector 34 as a relay unit-side transmitting / receiving end. Each of the optical fibers 32 and 33 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 34 connects the camera optical fiber cable 31 and the relay unit side transmitting / receiving unit 12.

A relay unit 40 is connected to the relay unit-side transmitting / receiving section 12.
A serial data forming unit 41 is provided. The serial data forming unit 41 is obtained by serializing the HD signal obtained by the video camera, which is arriving through the relay unit-side transmitting / receiving unit 12 and another relay unit-side transmitting / receiving 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 serialized, and is mapped to an SDI (serial digital interface) that transmits serial digital data with 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.

Video data DSA, DSB, DSC from serial data forming section 41 in 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 configuration example of the data multiplexing unit 42 shown in FIG.
4 channel video data DSA to DSD
Are serial / parallel (S / P) converters 45 and 46,
47 and 48, respectively. The S / P conversion unit 45 converts the video data DSA, which is serial digital data having a bit transmission rate of 270 Mbps, into S / P data.
P conversion is performed to form parallel digital data DPA, and the parallel digital data DPA is supplied to the data mapping unit 49. Similarly, the S / P converters 46, 47 and 48 set the bit transmission rate to 27
S / P conversion is applied to video data DSB, DSC, and DSD, which are serial digital data of 0 Mbps, to form parallel digital data DPB, DPC, and DPD. 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 31 through the optical connector 34.

In the camera optical fiber cable 31, the E / O converter 21 in the CCU side transmitting / receiving section 11
From the optical connector 30 connected to the optical connector 30
From the CU side transmitting / receiving end, two optical fibers 32 and 33
For example, the optical signal OSM transmitted from the E / O conversion unit 51 in the relay unit side transmitting / receiving unit 12 to the relay unit side transmitting / receiving end unit connected to the optical connector 34 through the optical fiber 32 is transmitted. , Optical connector 3
4 is connected to the optical connector 30 via the other one of the two optical fibers 32 and 33, for example, the optical fiber 33 from the relay unit side transmitting / receiving end connected to the optical connector 30.
The data is transmitted to the U-side transmitting / receiving end. That is, the video camera 13
, And optical signals OVM based on the serial digital video signals DVA and DVB respectively obtained from the serial digital video signals DVA and DVB and the four-channel video data DSA to
The optical signal OSM based on the DSD is bidirectionally transmitted between the CCU-side transmitting / receiving end of the camera optical fiber cable 31 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 relay unit side transmitting / receiving end of the camera optical fiber cable 31 to the CCU side transmitting / receiving end through the optical fiber 33 is approximately 1.31 μm. The optical signal OSM sets the bit transmission rate to 1.485G.
Under the bps, the light is guided to the photoelectric converter (O / E converter) 55 through the optical connector 30.

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, thereby obtaining the multiplexed video data DSM having undergone the waveform shaping. The data is supplied to the data separation unit 57. The data separating section 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. 7, the multiplexed video data DSM from the waveform shaping unit 56 is supplied to the S / P conversion unit 58. The S / P converter 58 converts the multiplexed video data DSM into an S / P
By performing the conversion, multiplexed parallel data DPM which is 20-bit word string data having a word transmission rate of 74.25 MBps based on the multiplexed video data DSM is obtained.

The multiplexed parallel data DPM from the S / P converter 58 is supplied to a data demapper 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 to 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, and 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 conversion units 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 E / O conversion in the CCU-side transmitting / receiving section 11 transmitted from the CCU-side transmitting / receiving end of the camera optical fiber cable 31 to the relay unit-side transmitting / receiving end through the optical fiber 32. An optical signal OVM having a center wavelength of approximately 1.31 μm or approximately 1.55 μm from the unit 21 is guided to the O / E conversion unit 65 through the optical connector 34 with the bit transmission rate set to 2.97 Gbps. .

In the O / E converter 65, the optical signal OV
M is subjected to photoelectric conversion to reproduce composite serial data DVM having a bit transmission rate of 2.97 Gbps based on an optical signal OVM having a center wavelength of approximately 1.31 μm or approximately 1.55 μm. Then, the reproduced composite serial data DVM is supplied to the bit separation unit 66.

The bit separation unit 66 is configured using, for example, a 2-bit demultiplexer, and the O / E conversion unit 6
5 are sequentially taken out from the composite serial data DVM from No. 5 and distributed alternately, and each serial digital video signal DVA is formed by serial digital data having a bit transmission rate of 2.97 Gbps / 2 = 1.485 Gbps. And the serial digital video signal DVB. Thus, the serial digital video signals DVA and DVB obtained from the bit separation section 66 are supplied to the waveform shaping sections 67 and 68, respectively.

In the waveform shaping section 67, a clock is reproduced from the serial digital video signal DVA, and data is re-created based on the reproduced clock, so that the waveform-shaped serial digital video signal DVA is obtained. can get. The waveform shaping unit 6
At 8, the clock is reproduced for the serial digital video signal DVB, and the data is re-created based on the reproduced clock to obtain the waveform-shaped serial digital video signal DVB.

In this way, the waveform shaping units 67 and 68
The serial digital video signals DVA and DVB respectively reproduced in are transmitted from the relay unit side transmitting / receiving section 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 transmitting / receiving unit 11 through the optical fiber 33 built in the camera optical fiber cable 31. 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 31 for the camera. 3
3 is transmitted to the CCU side transmitting / receiving section 11.

FIG. 8 and FIG. 9 show claims 8 to 14 and claim 24 in the claims of the present application.
The optical signal transmission according to the invention described in claim 16 or claim 33 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 31 is implemented. 1 shows an example of an apparatus. This example includes a portion configured similarly to the example shown in FIG.
Parts corresponding to the respective parts shown in FIG. 1 are denoted by the same reference numerals as in FIG. 1, and overlapping detailed description thereof will be omitted.

In the examples shown in FIGS. 8 and 9, bidirectional transmission of digital video signals is performed between the CCU-side transmitting / receiving section 71 and the relay unit-side transmitting / receiving section 72. A camera unit 77 formed by four video cameras 73, 74, 75 and 76 is connected to the CCU-side transmitting / receiving unit 71.

From the video cameras 73 to 76, serial
Digital video signals DVA, DVB, DVC and DV
D is sent out respectively. These serial digital video
Each of the signals DVA to DVD is, for example, as shown in FIG.
Y data series and P _B/ P_RMany with data series
20-bit quantized digital data obtained by performing weighting processing
Serial signal obtained by serializing the HD signal
Bit transmission level formed by digital data.
The rate is set to 1.485 Gbps. Soshi
And the serials obtained from the video cameras 73-74, respectively.
Digital video signals DVA to DVD are transmitted and received on the CCU side.
It is supplied to the communication unit 71.

In the CCU side transmitting / receiving section 71, the serial digital video signals DVA and DVB from the video cameras 73 and 74 form transmission paths for the serial digital video signals DVA and DVB by the equalizing sections 78 and 79, respectively. The video data DVA 'and DVB' are subjected to equalization processing for coping with the attenuation caused by the coaxial cable, and supplied to the waveform shaping units 80 and 81. In the waveform shaping units 80 and 81, clock reproduction is performed for each of the video data DVA ′ and DVB ′, and data is re-created based on the reproduced clock, and the waveform-shaped video data DVA is performed. 'And DVB' have a bit transmission rate of 1.485 Gbps
Which is supplied to the bit multiplexing unit 82.

The bit multiplexing unit 82 is constituted by using, for example, a 2-bit multiplexer, and alternately sends one bit from each of the video data DVA 'from the waveform shaping unit 80 and the video data DVB' from the waveform shaping unit 81. The video data DVA 'and the video data DVB' are subjected to bit multiplexing / combining processing to form composite serial data DVM1 having a bit transmission rate of 1.485 Gbps × 2 = 2.97 Gbps. Thus, the composite serial data DVM1 obtained from the bit multiplexing unit 82 is supplied to the E / O conversion unit 83. E /
The O-converter 83 is configured, for example, in the same manner as the E / O converter 21 shown in FIG.
For example, an optical signal OVM1 having a center wavelength of about 1.31 μm is formed. The optical signal OVM1 obtained from the E / O conversion unit 83 is supplied to the multiplexing unit 84.

In the CCU transmitting / receiving section 71,
The serial digital video signals DVC and DVD from the video cameras 75 and 76 are supplied to equalizers 85 and 86, respectively.
Digital video signals DVC and DV
The video data DVC ′ and DV are subjected to equalization processing for coping with attenuation by the coaxial cable forming the transmission path of D.
D ′ is supplied to the waveform shaping units 87 and 88. In the waveform shaping sections 87 and 88, the video data DV
Clock reproduction is performed for each of C ′ and DVD ′, and data is re-created based on the reproduced clock to perform waveform shaping on the video data D.
VC 'and DVD' have a bit transmission rate of 1.485
Gbps, which is supplied to the bit multiplexing unit 89.

The bit multiplexing unit 89 is constituted by using, for example, a 2-bit multiplexer, and alternately assigns one bit to each of the video data DVC 'from the waveform shaping unit 87 and the video data DVD' from the waveform shaping unit 88. The video data DVC 'and the video data DVD' are subjected to bit multiplexing / combining processing to form composite serial data DVM2 having a bit transmission rate of 1.485 Gbps × 2 = 2.97 Gbps. Thus, the composite serial data DVM2 obtained from the bit multiplexing unit 89 is supplied to the E / O conversion unit 90. E /
The O-converting unit 90 is configured, for example, in the same manner as the E / O converting unit 21 shown in FIG.
An optical signal OVM2 having a center wavelength of about 1.55 μm, for example, is formed. The optical signal OVM2 obtained from the E / O conversion unit 90 is also supplied to the multiplexing unit 84.

The multiplexing section 84 is formed by, for example, a fiber-type WDM coupler (fiber-type WDM coupler). The multiplexing section 84 formed by the fiber type WDM coupler is configured as shown in FIG. 10, for example.

In the configuration shown in FIG. 10, E / O
The optical signal OVM1 having a center wavelength of approximately 1.31 μm from the conversion unit 83 is guided to the directional coupling unit 92 through the optical connector 91, and the center wavelength from the E / O conversion unit 90 is set to approximately 1.55 μm. The optical signal OVM2 is guided to the directional coupling unit 92 through the optical connector 93. The directional coupling portion 92 is a portion where the optical fiber for guiding light through the optical connector 91 and the optical fiber for guiding light through the optical connector 93 are mutually connected. In the directional coupler 92, the optical signal OVM1 having a center wavelength of approximately 1.31 μm and the optical signal OVM having a center wavelength of approximately 1.55 μm
VM2 is multiplexed and multiplexed, and a multiplexed optical signal OVM is transmitted. Multiplexed optical signal O obtained in directional coupler 92
The VM is led out through the optical connector 94.

As described above, the multiplexed optical signal OVM derived from the multiplexing section 84 is guided from the CCU transmitting / receiving section 71 to the camera optical fiber cable 31 forming the optical fiber transmission path through the optical connector 30. The optical connector 30 connects the CCU side transmitting / receiving unit 71 and the optical fiber cable 31 for a camera. The camera optical fiber cable 31 is the same as that used in the example shown in FIG.

In the CCU transmitting / receiving section 71,
In addition to the above, the O / E conversion unit 55, the waveform shaping unit 56, and the data separation unit 57 correspond to the CCU in the example shown in FIG.
It is provided similarly to the O / E conversion unit 55, the waveform shaping unit 56, and the data separation unit 57 provided in the side transmitting / receiving unit 11.

The relay unit 95 is connected to the relay unit-side transmitting / receiving section 72.
A serial data forming unit 41 is provided. The serial data forming unit 41 is the same as the serial data forming unit 41 provided in the relay unit 40 in the example shown in FIG. Each of them sends the bit transmission rate at 270 Mbps.

The video data DSA to DSD from the serial data forming unit 41 in the relay unit 95 are the same as those provided in the relay unit side transmitting / receiving unit 12 in the example shown in FIG. The data is supplied to the data multiplexing unit 42. Thereby, the bit transmission rate from the data multiplexing unit 42 is set to 1.485 Gb.
ps multiplexed video data DSM is obtained,
The relay unit side transmitting / receiving unit 12 in the example shown in FIG.
The optical signal OSM whose central wavelength is approximately 1.31 μm, for example, based on the multiplexed video data DSM and is supplied to the E / O conversion unit 51 similar to the one provided in It is obtained under the condition that the rate is 1.485 Gbps. The optical signal OSM obtained from the E / O converter 51 is transmitted to the relay unit side transmitting / receiving section 72.
Through the optical connector 34 to the optical fiber cable 31 for the camera.

In the camera optical fiber cable 31, the multiplexed optical signal OVM obtained from the multiplexing section 84 based on the serial digital video signals DVA to DVD obtained from the video cameras 73 to 76 and the serial data forming section 41, respectively. 4 channel video data DSA ~
The optical signal OSM based on the DSD is bidirectionally transmitted between the transmitting / receiving end on the CCU side and the transmitting / receiving end on the relay unit side.

Then, in the relay unit-side transmitting / receiving section 72, the demultiplexing section 84 in the CCU-side transmitting / receiving section 71 transmitted from the CCU-side transmitting / receiving end of the camera optical fiber cable 31 to the relay unit-side transmitting / receiving end through the optical fiber 32. Multiplexed optical signal OVM is guided to the demultiplexer 100 via the optical connector 34 under the condition that the bit transmission rate is 2.97 Gbps.

The demultiplexing unit 100 is, for example, approximately 1.55 μm
The first blocking filter for light in the wavelength band including the center wavelength and the second blocking filter for light in the wavelength band including the center wavelength of about 1.31 μm have a center wavelength of about 1.31 μm. An optical connector through which the optical signal OVM1 passes and an optical signal OVM2 having a center wavelength of about 1.55 μm
Fiber-type WDM couplers with built-in rejection filters, which are respectively built in the optical connectors through which the light passes, are used as demultiplexing means. Such a fiber type WDM coupler with a built-in rejection filter is configured, for example, as shown in FIG.

In the configuration shown in FIG. 11, the multiplexed optical signal OVM transmitted through the optical connector 34 is
1 to the directional coupling unit 102. The directional coupling unit 102 is a part in which an optical fiber for guiding light through the optical connector 101 is divided into two optical fibers, and the two divided optical fibers form two output ports. An optical signal OVM2 having a center wavelength of approximately 1.55 μm obtained by performing a demultiplexing process on the multiplexed optical signal OVM is provided to two output ports extending from the directional coupling unit 102.
Is about 1.31 μ
m, and the center wavelength is approximately 1.31 μm.
And an optical signal OVM2 having a center wavelength of about 1.55 μm, which is mixed with the optical signal OVM1 due to crosstalk, and an optical signal OV having a center wavelength of about 1.55 μm.
M2 is approximately 1.3, which is the center wavelength mixed due to crosstalk.
The optical signal OVM1 having a wavelength of 1 μm is guided to the 1.55 μm blocking filter input optical connector 103, and the optical signal OVM1 having a central wavelength of approximately 1.31 μm is mixed with a central wavelength of approximately 1.55 μm due to crosstalk. Signal OVM2 is 1.31 μm blocking filter input optical connector 1
04.

1.55 μm blocking filter optical connector 1
03, an optical signal OV having a center wavelength of approximately 1.31 μm by a built-in 1.55 μm blocking filter.
An optical signal OVM2 having a center wavelength of about 1.55 μm mixed therein is removed from M1, and the center wavelength becomes about 1.31.
The optical signal OVM1 having a bit transmission rate of 2.
The signal is reproduced at 97 Gbps and is led out from the 1.55 μm blocking filter optical connector 103. Also,
In the 1.31 μm blocking filter input optical connector 104, the built-in 1.31 μm blocking filter converts the optical signal OVM 2 having a center wavelength of about 1.55 μm into a light having a center wavelength of about 1.31 μm mixed therein. Signal OV
The optical signal OVM2 having the center wavelength of about 1.55 μm with the M1 removed has a bit transmission rate of 2.97 Gbps.
And is led out from the 1.31 μm blocking filter input connector 104.

As described above, the optical signal OVM1 having the center wavelength of about 1.31 μm and the optical signal OVM2 having the center wavelength of about 1.55 μm reproduced by the demultiplexer 100 are:
The signals are supplied to the O / E converters 105 and 106, respectively.

The O / E converter 105 performs O / E conversion on the optical signal OVM1 having a center wavelength of approximately 1.31 μm, and performs optical signal OVM having a center wavelength of approximately 1.31 μm.
1, the composite serial data DVM1 having a bit transmission rate of 2.97 Gbps is reproduced. Then, the reproduced composite serial data DVM1 is supplied to the bit separation unit 107.

The bit separation unit 107 is constituted by using, for example, a 2-bit demultiplexer, and sequentially takes out one bit from the composite serial data DVM1 from the O / E conversion unit 105 and distributes it one by one. A serial digital video signal DVA and a serial digital video signal DVB formed by serial digital data having a transmission rate of 2.97 Gbps / 2 = 1.485 Gbps are individually formed. Thus, the serial digital video signals DVA and DVB obtained from the bit separation unit 107 are supplied to the waveform shaping units 108 and 109, respectively.

In the waveform shaping section 108, clock recovery is performed on the serial digital video signal DVA, and data is re-created based on the recovered clock, and the serial digital video signal DVA having undergone waveform shaping is output. can get. In the waveform shaping section 109, the serial digital video signal DV
B, the clock is reproduced, and the data is re-created based on the reproduced clock to perform the waveform shaping on the serial digital video signal DVB.
Is obtained.

Thus, waveform shaping sections 108 and 1
09, the serial digital video signals DVA and DVB respectively reproduced at the relay unit side
And is supplied to the relay unit 95.

In the O / E converter 106, the optical signal OVM2 having a center wavelength of about 1.55 μm is converted to an O / E signal.
After the conversion, the bit transmission rate based on the optical signal OVM2 having the center wavelength of about 1.55 μm is set to 2.97 Gbp.
s is reproduced. Then, the reproduced composite serial data DVM2 is supplied to the bit separation unit 110.

The bit separation unit 110 is constituted, for example, by using a 2-bit demultiplexer. The bit separation unit 110 sequentially takes out one bit from the composite serial data DVM2 from the O / E conversion unit 106 and distributes the bits one by one. A serial digital video signal DVC and a serial digital video signal DVD formed by serial digital data having a transmission rate of 2.97 Gbps / 2 = 1.485 Gbps are individually formed. Thus, the serial digital video signals DVC and DVD obtained from the bit separation unit 110 are supplied to the waveform shaping units 111 and 112, respectively.

In the waveform shaping section 111, a clock is reproduced from the serial digital video signal DVC, and data is re-created based on the reproduced clock, so that the waveform-shaped serial digital video signal DVC is converted. can get. In the waveform shaping section 112, the serial digital video signal DV
D is reproduced, and data is re-created based on the reproduced clock, and the waveform-shaped serial digital video signal DVD
Is obtained.

Thus, the waveform shaping units 111 and 1
The serial digital video signals DVC and DVD reproduced respectively in the transmission unit 12
And is supplied to the relay unit 95.

In the examples shown in FIGS. 8 and 9 as well, the serial data forming section 41 provided in the relay unit 95 is 4-channel serial digital data with a bit transmission rate of 270 Mbps. Video data DSA to DSD are transmitted, and in the relay unit side transmitting / receiving section 72, the data multiplexing section 42
Multiplexed parallel data DPM, which is 20-bit word string data with a word transmission rate of 74.25 MBps based on the channel video data DSA to DSD, is formed, subjected to P / S conversion, and the bit transmission rate is set to 1.485 Gbps. Multiplexed video data DSM is obtained. Further, an optical signal OSM based on the multiplexed video data DSM is obtained in the E / O converter 51, and the optical signal OSM is transmitted through the optical fiber 33 built in the camera optical fiber cable 31. The serial digital data transmitted from the serial data forming unit 41 provided in the relay unit 95 is transmitted to be transmitted to the CCU side transmitting / receiving unit 71.
It is not limited to A to DSD.

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. At this time, in the relay unit-side transmitting / receiving section 72, the data multiplexing section 42 forms multiplexed parallel data that is 20-bit word string data with a word transmission rate based on 6-channel video data of 108 MBps, and 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 31 for the camera. 3
3 is transmitted to the CCU side transmitting / receiving unit 71.

FIG. 12 shows another optical signal transmission method according to any one of claims 1 to 7 and claims 17 to 23 in the claims of the present application. Another example of the optical signal transmission device according to the invention described in claim 15 or claim 32 in the claims of the present application, in which the example is implemented, will be described. This example includes a portion configured in the same manner as the example shown in FIG.
Are assigned the same reference numerals as in FIG. 1 and the detailed description thereof will be omitted.

In the example shown in FIG. 12, bidirectional transmission of digital video signals is performed between the CCU side transmitting / receiving section 121 and the relay unit side transmitting / receiving section 122. The CCU side transmitting / receiving unit 121 includes a camera unit 125 formed by two video cameras 123 and 124.
Are connected.

[0096] The serial digital video optical signal OVA is transmitted from the video camera 123, and the serial digital video optical signal OVB is transmitted from the video camera 124.
Is sent. Each of these serial digital video optical signal OVA and OVB people, for example, 20-bit quantization digital multiplexing processing is obtained is subjected to the Y data sequence and the P _B / P _R data series as shown in FIG. 15 Serial digital data having a bit transmission rate of 1.485 Gbps obtained by serializing an HD signal, which is a signal, is obtained by being converted into an optical signal, whereby the bit transmission rate is set to 1.485 Gbps. The center wavelength is, for example, approximately 1.31 μm.

Then, the serial digital video optical signals OVA obtained from the video cameras 123 and 124, respectively.
And OVB are supplied to the CCU side transmitting / receiving section 121.

In the CCU transmitting / receiving section 121, the serial digital video optical signal OVA from the video camera 123 is supplied to the O / E converter 126. The O / E converter 126 performs O / E conversion on the serial digital video optical signal OVA to generate serial digital data, thereby increasing the bit transmission rate to 1.485 Gb.
A serial digital video signal DVA formed by serial digital data of ps is obtained. This O
The serial digital video signal DVA obtained from the / E conversion unit 126 is supplied to the waveform shaping unit 17. The waveform shaping unit 17 performs the same operation as the operation of the waveform shaping unit 17 provided in the example shown in FIG. , And the bit multiplexing unit 18.

The serial digital video light signal OVB from the video camera 124 is supplied to the O / E converter 127. The O / E conversion section 127 performs O / E conversion on the serial digital video optical signal OVB to convert the serial digital video signal OVB into serial digital data. Obtain a digital video signal DVB. The serial digital video signal DVB obtained from the O / E converter 127 is
Supplied to In the waveform shaping section 20, the same operation as the operation in the waveform shaping section 20 provided in the example shown in FIG. 1 is performed, and the waveform-shaped serial digital video signal DVB obtained from the waveform shaping section 20 is output. , And the bit multiplexing unit 18.

In the bit multiplexing unit 18 and the subsequent E / O conversion unit 21, the same operation as the operation in the bit multiplexing unit 18 and the E / O conversion unit 21 provided in the example shown in FIG. 1 is performed. An optical signal OV having a center wavelength of about 1.31 μm or about 1.55 μm from the E / O converter 21
M is obtained at a bit transmission rate of 2.97 Gbps. Then, the optical signal OVM obtained in the E / O conversion section 21 is introduced from the CCU side transmission / reception section 121 to the camera optical fiber cable 31 through the optical connector 30 from the CCU side transmission / reception end. And the optical signal O
The VM is transmitted to the relay unit side transmitting / receiving end of the camera optical fiber cable 31 through the optical fiber 32 built in the camera optical fiber cable 31, and is supplied to the relay unit side transmitting / receiving unit 122 through the optical connector 34.

A relay unit 130 is connected to the relay unit side transmitting / receiving section 122.
Is provided with an optical serial data forming unit 131. The optical serial data forming unit 131 is obtained by serializing an HD signal obtained by a video camera, which arrives through the relay unit side transmitting / receiving unit 122 and further another relay unit side transmitting / receiving unit (not shown). A plurality of serial digital video signals having a bit transmission rate of 1.485 Gbps are subjected to compression processing to form a 10-bit word string data according to a data format as shown in FIG. 17, for example. A D1 signal, which is a signal, is serialized, and the bit transmission rate is set to 270 Mbp.
The E / O conversion is performed on the serial digital data obtained by mapping the serial digital data to the SDI for transmitting the serial digital data as the optical video data OSA. OSB, OSC
And an OSD. The optical serial data forming unit 131 outputs, for example, the optical video data O of four channels.
Each of SA to OSD has a bit transmission rate of 270 Mb.
ps, and the central wavelength is, for example, about 1.31 μm.

Optical video data OSA to OSD from optical serial data forming section 131 in relay unit 130
Is supplied to the O / E conversion unit 132 in the relay unit side transmission / reception unit 122. The O / E conversion unit 132 performs O / E conversion on each of the optical video data OSA to OSD.
E conversion is performed to form video data DSA, DSB, DSC and DSD having a bit transmission rate of 270 Mbps based on the optical video data OSA to OSD, respectively.
Thus, the video data DS having the bit transmission rate obtained from the O / E conversion unit 122 of 270 Mbps
A to DSD are 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 1.31 μm is obtained from the O / E conversion section 51 at a bit transmission rate of 1.485 Gbps. And O
The optical signal OSM obtained from the / E conversion unit 51 is introduced from the relay unit side transmission / reception unit 122 to the camera optical fiber cable 31 through the optical connector 34 from the transmission / reception end of the relay unit side. The optical signal OSM is transmitted to the CCU side transmitting / receiving end of the camera optical fiber cable 31 through the optical fiber 33 built in the camera optical fiber cable 31, and is supplied to the CCU side transmitting / receiving unit 121 through the optical connector 30.

Then, in the CCU side transmitting / receiving section 121, the optical signal OSM whose center wavelength is approximately 1.31 μm from the E / O conversion section 51 in the relay unit side transmitting / receiving section 122 has a bit transmission rate of 1.485 Gbps. Then, the light is guided to the O / E converter 55 through the optical connector 30.

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 operation in the data separation unit 57 are performed. From the data separation unit 57, 4-channel video data DSA to DSD, each being serial digital data having a bit transmission rate of 270 Mbps, are obtained. , E / O converter 133. E /
In the O conversion unit 133, the video data DSA to DS
D and E / O conversion for each video data DS
A to DSD, each having a bit transmission rate of 2
70 Mbps, and the center wavelength is approximately 1.31 μm.
The optical video data OSA to OSD are reproduced. In this way, the optical video data OSA to OSD obtained from the E / O conversion unit 133 are transmitted from the CCU side transmission / reception unit 121 and supplied to the camera unit 125.

Further, in the relay unit side transmitting / receiving section 122, the center wavelength from the E / O conversion section 21 in the CCU side transmitting / receiving section 121 is set to approximately 1.31 μm or approximately 1.31 μm.
The optical signal OVM of 55 μm is supplied to the O / E converter 65 through the optical connector 34 under the condition that the bit transmission rate is 2.97 Gbps. The O / E conversion unit 65 and the bit separation unit 66 following the O / E conversion unit 65 and the waveform shaping units 67 and 68 include the O / E conversion unit 65, the bit separation unit 66, Waveform shaping unit 6
Operations similar to the operations in 7 and 68 are performed.
Serial digital video signals DVA and DVB formed by serial digital data subjected to waveform shaping at 5 Gbps are reproduced.

Serial digital video signals DVA and DVB obtained from waveform shaping sections 67 and 68 are E / O
The signals are supplied to the conversion units 134 and 135, respectively. In the E / O converter 134, the serial digital video signal D
E / O conversion is performed on VA to set the center wavelength to, for example, 1.
Serial digital video optical signal OVA of 31 μm
To play. The E / O converter 135 performs E / O conversion on the serial digital video signal DVB to reproduce a serial digital video optical signal OVB having a center wavelength of, for example, 1.31 μm. Then, the serial digital video optical signals OVA and OVB reproduced in this manner are transmitted to the relay unit side transmitting / receiving section 122.
And is supplied to the relay unit 130.

In the example shown in FIG. 12, the optical serial data forming section 131 provided in the relay unit 130 sets the bit transmission rate to 270 Mbps and the center wavelength to about 1.31 μm. Optical video data OS which is optical serial digital data of 4 channels
A to OSD are transmitted, and in the relay unit side transmitting / receiving section 122, the E / O conversion section 51 multiplexes the video data DSA to DSD obtained by subjecting the optical video data OSA to OSD to O / E conversion. An optical signal OSM based on the multiplexed video data DSM is obtained and transmitted to the CCU side transmitting / receiving unit 121 through the optical fiber 33 built in the optical fiber cable 31 for the camera. The optical serial digital data transmitted from the optical serial data forming unit 131 provided in the relay unit 130 is not limited to the four-channel optical video data OSA to OSD.

For example, from the optical serial data forming section 131, optical video data as optical serial digital data of 6 channels, each having a bit transmission rate of 270 Mbps and a center wavelength of about 1.31 μm, is transmitted. May be done. At this time, in the relay unit side transmitting / receiving unit 122, the E / O conversion unit 51
An optical signal based on multiplexed video data formed by multiplexing 6-channel video data obtained by performing O / E conversion on 6-channel optical video data is obtained,
It is transmitted to the CCU side transmitting / receiving unit 121 through the optical fiber 33 built in the optical fiber cable 31 for the camera.

FIGS. 13 and 14 show an optical signal transmission method according to any one of claims 8 to 14 and claims 24 to 31 of the present application. Another example of the optical signal transmission device according to the invention described in claim 16 or claim 33 in the claims of the present application, in which another example is implemented, is shown. This example includes portions configured similarly to the examples shown in FIGS. 8 and 9, and portions corresponding to the respective portions shown in FIGS. 8 and 9 are denoted by the same reference numerals as those in FIGS. 8 and 9. , And redundant detailed description thereof will be omitted.

The examples shown in FIG. 13 and FIG.
The bidirectional transmission of the digital video signal between the transmission / reception unit 141 and the relay unit-side transmission / reception unit 142 is performed. A camera unit 147 including four video cameras 143, 144, 145, and 146 is connected to the CCU-side transmitting / receiving unit 141.

From the video cameras 143 to 146, serial digital video optical signals OVA, OVB, OVC and OVD are respectively transmitted. Each of these serial digital video optical signals OVA to OVD is, for example, as shown in FIG.
Y data sequence and the P _B / P _R data sequence and HD signal multiplexing processing is 20-bit quantized digital signal obtained is subjected to the as shown in 5 is obtained is serialized, the bit transmission rate Serial digital data of 1.485 Gbps is obtained by being converted into an optical signal, whereby the bit transmission rate is 1.485 Gbps.
and the center wavelength is, for example, approximately 1.31 μm.
m.

The serial digital video optical signals OVA-O obtained from the video cameras 143-146, respectively.
The OVD is supplied to the CCU side transmitting / receiving section 141.

In the CCU side transmission / reception section 141, serial digital video optical signals OVA and OVB from the video cameras 143 and 144 are supplied to O / E conversion sections 148 and 149, respectively. The O / E conversion section 148 performs O / E conversion on the serial digital video optical signal OVA to obtain serial digital data, thereby forming a serial digital video signal formed of serial digital data having a bit transmission rate of 1.485 Gbps. DVA is obtained and supplied to the waveform shaping unit 80. Also, the O / E conversion section 149 performs O / E conversion on the serial digital video optical signal OVB into serial digital data, thereby forming a serial digital data formed by serial digital data having a bit transmission rate of 1.485 Gbps. Video signal DVB
And supplies it to the waveform shaping section 81.

Further, in the CCU transmitting / receiving section 141, the serial digital video optical signals OVC and OVD from the video cameras 145 and 146 are supplied to the O / E conversion sections 150 and 151, respectively. O / E converter 15
0 is O / E to the serial digital video optical signal OVC.
By converting the serial digital data into serial digital data, a serial digital video signal DVC formed of serial digital data having a bit transmission rate of 1.485 Gbps is obtained, and the resulting signal is waveform-shaped by the waveform shaping section 87.
To supply. The O / E conversion section 151 performs O / E conversion on the serial digital video optical signal OVD into serial digital data, thereby forming a serial digital data formed by serial digital data having a bit transmission rate of 1.485 Gbps. The video signal DVD is obtained and supplied to the waveform shaping unit 88.

The waveform shaping units 80, 81, 87 and 88, and the bit multiplexing units 82 and 89, E /
In the O conversion units 83 and 90 and the multiplexing unit 84,
Waveform shaping section 8 provided in the examples shown in FIGS. 8 and 9
0, 81, 87 and 88, bit multiplexing sections 82 and 89,
The video data DVA ', DVB', DVC 'and DV are output from the E / O converters 83 and 90 and the multiplexer 84.
An operation similar to the operation performed on D ′ is performed on serial digital video signals DVA to DAD. As a result, multiplexing section 84 generates multiplexed optical signal OVM based on serial digital video signals DVA to DAD. It is obtained under the condition that the bit transmission rate is 2.97 Gbps. The multiplexed optical signal OVM obtained in the multiplexing section 84
Is introduced from the CCU side transmitting / receiving unit 141 to the camera optical fiber cable 31 through the optical connector 30 from the CCU side transmitting / receiving end. And the multiplexed optical signal OVM is
The optical fiber cable 3 for the camera passes through the optical fiber 32 built in the optical fiber cable 31 for the camera.
The signal is transmitted to the transmission / reception end of the relay unit 1 and supplied to the transmission / reception unit 142 of the relay unit via the optical connector 34.

The CCU transmitting / receiving section 141 has an O / E conversion section 55 and a waveform shaping section 56 in addition to the above.
And the data separation unit 57 are provided similarly to the O / E conversion unit 55, the waveform shaping unit 56, and the data separation unit 57 provided in the CCU-side transmission / reception unit 71 in the examples shown in FIGS. From the data separation unit 57, video data DSA, DSB, video data DSA, DSB, each formed of serial digital data having a bit transmission rate of 270 Mbps.
DSC and DSD are sent out. The video data DSA to DSD from the data separation unit 57 are transmitted to the E / O conversion unit 152.
Supplied to

The E / O conversion section 152 performs E / O conversion on each of the video data DSA to DSD,
Based on each of the video data DSA to DSD, each has a bit transmission rate of 270 Mbps and a center wavelength of about 1.
The optical video data OSA to OSD of 31 μm is reproduced. In this way, the optical video data OSA to OSD obtained from the E / O conversion unit 152 are sent from the CCU transmitting / receiving unit 141 and supplied to the camera unit 147.

A relay unit 153 is connected to the relay unit side transmitting / receiving section 142.
Is provided with an optical serial data forming unit 154. The optical serial data forming unit 154 is obtained by serializing HD signals, each of which is obtained by a video camera, which arrives via the relay unit side transmitting / receiving unit 142 and another relay unit side transmitting / receiving unit (not shown). A plurality of serial digital video signals having a bit transmission rate of 1.485 Gbps are subjected to compression processing, for example, to form 10-bit word string data according to a data format as shown in FIG. A D1 signal, which is a signal, is serialized, and the bit transmission rate is set to 270 Mbp.
The E / O conversion is performed on the serial digital data obtained by mapping the serial digital data to the SDI for transmitting the serial digital data as the optical video data OSA. OSB, OSC
And an OSD. The optical serial data forming unit 154 outputs, for example, the optical video data O of four channels.
Each of SA to OSD has a bit transmission rate of 270 Mb.
ps, and the central wavelength is, for example, about 1.31 μm.

Optical video data DSA-DSD from optical serial data forming section 154 in relay unit 153
Is supplied to the O / E conversion unit 155 in the relay unit side transmission / reception unit 142. The O / E converter 155 performs O / E conversion on each of the optical video data OSA to OSD.
E-converted video data DSA, which are serial digital data each having a bit transmission rate of 270 Mbps based on the optical video data OSA to OSD, respectively.
Obtain DSB, DSC and DSD. In this way, O
The bit transmission rate obtained from the / E conversion unit 155 is 27
The video data DSA to DSD having 0 Mbps are 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 examples shown in FIGS. 8 and 9 are performed. Then, an optical signal OSM having a center wavelength of approximately 1.31 μm is obtained from the O / E converter 51 under the condition that the bit transmission rate is 1.485 Gbps. The optical signal OSM obtained from the O / E converter 51 is
It is introduced from the relay unit side transmitting / receiving section 142 to the camera optical fiber cable 31 through the optical connector 34 from the relay unit side transmitting / receiving end. And the optical signal OSM
Is transmitted to the CCU side transmitting / receiving end of the camera optical fiber cable 31 through the optical fiber 33 built in the camera optical fiber cable 31, and the optical connector 3
0 is supplied to the CCU side transmission / reception unit 141.

Further, in the relay unit side transmitting / receiving section 142, the demultiplexing section 84 in the CCU side transmitting / receiving section 141 which is transmitted from the CCU side transmitting / receiving end of the camera optical fiber cable 31 to the relay unit side transmitting / receiving end through the optical fiber 32. Multiplexed optical signal OVM from the optical connector 3 under the condition that the bit transmission rate is 2.97 Gbps.
The light is guided to the demultiplexer 100 through 4.

The demultiplexing section 100 and the following O /
E conversion units 105 and 106, bit separation units 107 and 1
10, and waveform shaping units 108, 109, 111 and 1
12, the demultiplexer 100, the O / E converters 105 and 106, the bit separators 107 and 110, and the waveform shaping unit 108 provided in the examples shown in FIGS.
Operations similar to the operations in 109, 111, and 112 are performed, and as a result, the waveform shaping units 108, 109, 111
And 112 each have a bit transmission rate of 1.4.
The serial digital video signals DVA, DVB, DVC and DVB formed by the serial digital data subjected to the waveform shaping at 85 Gbps are reproduced.

Waveform shaping sections 108, 109, 111 and 1
Video signals DVA to DVD obtained from the E / O 12
The signals are supplied to the conversion units 156, 157, 158 and 159, respectively. The E / O converter 156 performs E / O conversion on the serial digital video signal DVA to reproduce a serial digital video optical signal OVA having a center wavelength of, for example, 1.31 μm. Also, the E / O converter 15
7 to 159, the serial digital video signals DVB to DVD are respectively subjected to E / O conversion to convert the serial digital video signals DVB, DVD and OVD to have a center wavelength of, for example, 1.31 μm. Reproduce. Then, the serial digital video optical signals OVA to OVD reproduced in this manner are transmitted from the relay unit side transmitting / receiving section 142 and supplied to the relay unit 153.

Also in the examples shown in FIGS. 13 and 14, the optical serial data forming section 154 provided in the relay unit 153 has a bit transmission rate of 270.
Mbps, and the center wavelength is approximately 1.31 μm. Optical video data OSA to OSD, which are four-channel optical serial digital data, are sent out. An optical signal OSM based on multiplexed video data DSM formed by multiplexing video data DSA to DSD obtained by subjecting optical video data OSA to OSD to O / E conversion is obtained, which is an optical fiber for a camera. The optical serial digital data transmitted from the optical serial data forming unit 154 provided in the relay unit 153 is transmitted to the CCU side transmitting / receiving unit 141 via the optical fiber 33 incorporated in the cable 31. It is not limited to the channel optical video data OSA to OSD.

For example, the optical serial data forming unit 154 sends 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. In this case, in the relay unit side transmitting / receiving section 142, the E / O conversion section 51
An optical signal based on multiplexed video data formed by multiplexing 6-channel video data obtained by performing O / E conversion on 6-channel optical video data is obtained,
This is transmitted to the CCU side transmitting / receiving section 141 through the optical fiber 33 built in the camera optical fiber cable 31.

[0127]

As is apparent from the above description, the light according to any one of claims 1 to 7 and claims 17 to 23 in the claims of the present application. In the signal transmission method or the optical signal transmission device according to the invention described in claim 15 or claim 32 of the present application, the bit multiplexing / combining process is performed on the first plurality of serial digital data. The first optical signal based on the composite serial data obtained by performing the multiplexing process and the second optical signal based on the multiplexed serial data obtained by performing the multiplexing process on the second plurality of serial digital data are common. Transmitted by cable.

At this time, the first 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 An optical signal 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, and the first optical signal and the second optical signal are: The signal 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 incorporated in the cable, 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. The optical signal obtained by converting the digital data forming the digital data or the other type of digital data based on the digital data, using a camera 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 all bidirectional transmissions, a camera optical fiber cable arranged between a camera unit and a camera control unit or between a camera control unit and a relay unit is used as a cable. Multiple serial digital data is stored in multiple video cameras in the camera section. From the the digital data forming a respective plurality of digital video signals obtained, further, s the second plurality of serial digital data each being a multiple serial data is a digital data forming the digital video signal. As a result, the camera unit and the camera control unit of the optical signal obtained by converting the digital data forming the digital video signal obtained from each of the plurality of video cameras constituting the camera unit or other types of digital data based thereon are converted. , 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.

Further, the optical signal transmission method according to any one of claims 8 to 14 and claims 24 to 31 in the claims of the present application, In the optical signal transmission apparatus according to the present invention described in claim 16 or claim 33, the first plurality of serial digital data obtained by performing the bit multiplexing / combining process is obtained. A first having a first center wavelength based on the composite serial data
And a second optical signal having a second center wavelength based on the second composite serial data obtained by subjecting the second plurality of serial digital data to bit multiplexing / combining processing. A third having a first or second center wavelength based on the multiplexed optical signal obtained by performing the processing and the multiplexed serial data obtained by performing the multiplexing processing on the third plurality of serial digital data. Optical signals are transmitted by a common cable.

At this time, a multiplexed optical signal obtained by performing a multiplexing process on the first optical signal and the second optical signal is transmitted from the first transmitting / receiving end of the cable to the first optical signal embedded in the cable. A third optical signal is transmitted through the optical fiber to a second transmitting / receiving end of the cable, and a third optical signal is transmitted from the second transmitting / receiving end of the cable through a second optical fiber built into the cable to the first transmitting / receiving end of the cable. And a multiplexed optical signal and a third optical signal are transmitted through first and second optical fibers built into the cable, respectively, to form a first transmitting / receiving end and a second transmitting / receiving end of the cable. Is transmitted in both directions.

The optical signal transmission method or the optical signal transmission apparatus according to the invention described in the claims of the present application can be used, for example, in a digital video camera obtained from each of a plurality of video cameras constituting a camera unit. The optical fiber cable for the camera between the camera unit and the camera control unit or between the camera control unit and the relay unit of the optical signal obtained by converting the digital data forming the signal or the digital data of another format based on the signal is connected. When applied to bidirectional transmission using, 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,
The first plurality of serial digital data and the second plurality of serial digital data are digital data forming a plurality of digital video signals respectively obtained from a plurality of video cameras in the camera section, and further, are multiplex serial data. Each of the third plurality of serial digital data is digital data forming a digital video signal. As a result, the camera unit and the camera control unit of the optical signal obtained by converting the digital data forming the digital video signal obtained from each of the plurality of video cameras constituting the camera unit or other types of digital data based thereon are converted. , Or between the camera control unit and the relay unit, two-way transmission using a camera optical fiber cable,
Efficient camera fiber optic cable minimization is possible.

[Brief description of the drawings]

FIG. 1 is an example of an optical signal transmission method according to the invention described in any one of claims 1 to 7 and claims 17 to 23 in the claims of the present application. Claim 1 in the claims of the present application
FIG. 35 is a block connection diagram illustrating an example of an optical signal transmission device according to a fifth or thirty-second aspect.

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 another specific configuration example of the E / O converter 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 data multiplexing unit used in the example shown in FIG. 1;

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

FIG. 8 is an example of an optical signal transmission method according to any one of claims 8 to 14 and claims 24 to 31 in the claims of the present application. FIG. 35 is a block connection diagram showing an example of an optical signal transmission device according to the invention described in claim 16 or claim 33 of the claims of the present application.

FIG. 9 is an example of an optical signal transmission method according to the invention described in any one of claims 8 to 14 and claims 24 to 31 in the claims of the present application. FIG. 35 is a block connection diagram showing an example of an optical signal transmission device according to the invention described in claim 16 or claim 33 of the claims of the present application.

FIG. 10 is a block diagram showing a specific configuration example of a multiplexing unit used in the examples shown in FIGS. 8 and 9;

11 is a block diagram showing a specific configuration example of a demultiplexer used in the examples shown in FIGS. 8 and 9. FIG.

FIG. 12 is a diagram showing another example of the optical signal transmission method according to the invention described in any one of claims 1 to 7 and claims 17 to 23 in the claims of the present application. FIG. 35 is a block connection diagram showing another example of the optical signal transmission device according to the invention described in claim 15 or claim 32 of the present application.

FIG. 13 is a diagram showing another example of the optical signal transmission method according to the invention described in any one of claims 8 to 14 and claims 24 to 31 in the claims of the present application. FIG. 35 is a block connection diagram showing another example of the optical signal transmission device according to the invention described in claim 16 or claim 33 of the present application.

FIG. 14 is a diagram showing another example of the optical signal transmission method according to the invention described in any one of claims 8 to 14 and claims 24 to 31 in the claims of the present application. FIG. 35 is a block connection diagram showing another example of the optical signal transmission device according to the invention described in claim 16 or claim 33 of the present application.

FIG. 15 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. 16 is a time chart showing a data format of a word multiplex data sequence forming a digital video signal.

FIG. 17 is a time chart showing a data format of a digital video signal.

FIG. 18 is a sectional view showing a sectional structure of an optical fiber cable for a camera.

FIG. 19 is a characteristic diagram showing an attenuation characteristic of a quartz-based SMF.

FIG. 20 is a characteristic diagram showing dispersion characteristics of a quartz-based SMF.

[Explanation of symbols]

11, 71, 121, 141 ... CCU side transmitting / receiving section,
12, 72, 122, 142 ... relay unit side transmitting / receiving section, 13, 14, 73 to 76, 123, 124,
143-146 ... Video camera, 15, 77, 1
25,147 ... Camera part, 16,19,78,7
9, 85, 86 ... Equalization unit, 17, 20, 56, 6
7, 68, 80, 81, 87, 88, 108, 109,
111, 112,..., Waveform shaping section, 18, 82, 8
9: bit multiplexing unit, 21, 51, 83, 90, 1
33, 134, 135, 152, 156 to 159 ...
E / O converter, 22, 25 ... laser driver, 2
3 ... 1.3 μm band FP laser diode,
..1.55 μm band DFB laser diode, 30,
34, 91, 93, 94, 101 ... optical connector,
31 ... Optical fiber cable for camera, 32,3
3 ... optical fiber, 40, 95, 130, 153
... Relay unit, 41 ... Serial data forming unit, 42 ... Data multiplexing unit, 45-48, 58-
..S / P converter, 49 data mapping unit
50, 60 to 63... P / S converter, 55, 6
5,105,106,126,127,132,148
... 151, 155 ... O / E conversion section, 57 ... Data separation section, 59 ... Data demapping section, 6
6, 107, 110 ... bit separation unit, 84 ...
Multiplexing part, 92, 102 ... directional coupling part, 100
... Demultiplexer, 103... 1.55 μm blocking filter input connector, 104... 1.3 μm blocking filter input connector, 131, 154.

Claims (33)

[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, a bit multiplexing and combining process is performed on the first plurality of serial digital data to form composite serial data, and the composite serial data is converted into a first optical signal. Sending the first optical signal to the first optical fiber through the first transmitting / receiving end of the cable, performing multiplexing processing on a second plurality of serial digital data to obtain multiplexed serial data, Converting the multiplexed serial data into a second optical signal, transmitting the second optical signal to the second optical fiber through the second transmitting / receiving end of the cable, and converting the first optical signal to The first transmission And transmitting said second optical signal from said second transmitting / receiving end through said second optical fiber to said first transmitting / receiving end through said first optical fiber from said end. Optical signal transmission method to transmit to 2. The method according to claim 1, wherein said composite serial data is converted into a first optical signal by modulating a laser beam emitted by said first laser means in accordance with the composite serial data. Optical signal transmission method. 3. An optical signal transmission method according to claim 2, wherein said first laser means is a 1.3 μm band Fabry-Perot laser diode. 4. The apparatus according to claim 2, wherein said first laser means is a 1.55 μm band distributed feedback laser diode.
The optical signal transmission method according to the above. 5. The digital camera according to claim 1, wherein said first plurality of serial digital data comprises first serial digital data and second serial digital data. 3. The optical signal transmission method according to claim 1. 6. The method according to claim 1, wherein the multiplexed serial data is converted into a second optical signal by modulating a laser beam emitted by the second laser means in accordance with the multiplexed serial data. Item 6. The optical signal transmission method according to any one of Items 5 to 5. 7. The optical signal transmission method according to claim 6, wherein said second laser means is a 1.3 μm band Fabry-Perot laser diode. 8. 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, and a first multiple serial digital data is subjected to a bit multiplexing / combining process to form first composite serial data, and a bit is added to the second multiple serial digital data. The second composite serial data is formed by performing multiplexing and combining processing, the first composite serial data is converted into a first optical signal having a first center wavelength, and the second composite serial data is converted into a second optical signal.
Is converted into a second optical signal having a second center wavelength, the first optical signal and the second optical signal are subjected to multiplexing processing, and the first and second optical signals are converted. Obtaining a multiplexed optical signal based on the signal, transmitting the multiplexed optical signal to the first optical fiber through the first transmitting / receiving end of the cable, and multiplexing the third plurality of serial digital data. Obtaining multiplexed serial data, converting the multiplexed serial data into a third optical signal having the first center wavelength or the second center wavelength, and converting the third optical signal to the second optical signal in the cable; Transmitting the multiplexed optical signal from the first transmitting / receiving end to the second transmitting / receiving end through the first optical fiber, and transmitting the multiplexed optical signal to the second optical fiber through the transmitting / receiving end; Light signal Serial second optical signal transmission method for transmitting from the transmitting and receiving end the the first transmitting and receiving end through the second optical fiber. 9. The method according to claim 1, wherein the first composite serial 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 composite serial data. A second optical signal and a laser beam emitted by a second laser means for emitting a laser beam having a second center wavelength in accordance with the second composite serial data.
9. The optical signal transmission method according to claim 8, wherein the composite serial data is converted into a second optical signal. 10. The method according to claim 9, 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 method. 11. A multiplexing process using a fiber type wavelength division multiplexing coupler as a multiplexing means for the first optical signal and the second optical signal.
The optical signal transmission method according to any one of the above. 12. A method according to claim 1, wherein said first plurality of serial digital data comprises first serial digital data and second serial digital data.
12. The optical signal transmission method according to claim 8, wherein the plurality of serial digital data comprises a third serial digital data and a fourth serial digital data. . 13. 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. The optical signal transmission method according to any one of claims 8 to 12, wherein the optical signal is converted into an optical signal (3). 14. The optical signal transmission method according to claim 13, wherein said third laser means is a 1.3 μm band Fabry-Perot laser diode. 15. 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 bit multiplexing unit for performing bit multiplexing / combining processing on the first plurality of serial digital data to form composite serial data, and converting the composite serial data into a first optical signal A first optical-to-optical converter for transmitting the first optical signal to the first optical fiber through the first transmitting / receiving end of the cable; and a multiplexing process to a second plurality of serial digital data. And a data multiplexing unit that obtains multiplexed serial data by converting the multiplexed serial data into a second optical signal, and converts the second optical signal into the second optical signal through the second transmitting / receiving end of the cable. light A second light-to-light conversion unit for sending out to a fiber, and transmitting the first optical signal from the first transmission / reception end to the second transmission / reception end through the first optical fiber. An optical signal transmission device for transmitting the second optical signal from the second transmitting / receiving end to the first transmitting / receiving end through the second optical fiber. 16. 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 bit multiplexing unit for performing bit multiplexing / combining processing on the first plurality of serial digital data to form first composite serial data; A second bit multiplexing unit that performs bit multiplexing / synthesis processing on the digital data to form second composite serial data; and converts the first composite serial data into a first optical signal having a first center wavelength. A first electro-optical converter, a second electro-optical converter for converting the second composite serial data into a second optical signal having a second center wavelength, and a first optical signal and a second optical signal. The signal is subjected to multiplexing processing, and the first A multiplexing unit for obtaining a multiplexed optical signal based on the first and second optical signals and transmitting the multiplexed optical signal to the first optical fiber through the first transmitting / receiving end of the cable; A data multiplexing unit for performing multiplexing processing on digital data to obtain multiplexed serial data; and converting the multiplexed serial data into a third optical signal having the first center wavelength or the second center wavelength.
Transmitting a third optical signal to the second optical fiber through the second transmitting / receiving end of the cable;
And transmitting the multiplexed optical signal from the first transmitting / receiving end to the second transmitting / receiving end through the first optical fiber and the third optical signal. An optical signal transmission device for transmitting a signal from the second transmitting / receiving end to the first transmitting / receiving end through the second optical fiber. 17. 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, a bit multiplexing and combining process is performed on the first plurality of serial digital data to form composite serial data, and the composite serial data is converted into a first optical signal. Sending said first optical signal to said first optical fiber through said first transmitting / receiving end of said cable, and transmitting said first optical signal to said second transmitting / receiving end via said first optical fiber. Receiving the first optical signal, converting the transmitted first optical signal into reproduced composite serial data, and performing bit separation processing on the reproduced composite serial data to generate a first plurality of reproduced serial digital data. Multiplexing the second plurality of serial digital data to obtain multiplexed serial data, converting the multiplexed serial data into a second optical signal, and converting the second optical signal to the second optical signal in the cable. The second optical fiber is transmitted to the second optical fiber through the second transmitting / receiving end, and the second optical signal transmitted through the second optical fiber and arriving at the first transmitting / receiving end is received. An optical signal transmission method comprising: converting the optical signal into reproduced multiplexed serial data; and performing a separation process on the reproduced multiplexed serial data to obtain a second plurality of reproduced serial digital data. 18. The composite serial data according to claim 17, wherein said composite serial data is converted into a first optical signal by modulating a laser beam emitted by said first laser means in accordance with the composite serial data. Optical signal transmission method. 19. An optical signal transmission method according to claim 18, wherein said first laser means is a 1.3 μm band Fabry-Perot laser diode. 20. An optical signal transmission method according to claim 18, wherein said first laser means is a 1.55 μm band distributed feedback laser diode. 21. The method according to claim 17, wherein the first plurality of serial digital data comprises first serial digital data and second serial digital data. 3. The optical signal transmission method according to claim 1. 22. The multiplexed serial data is converted into a second optical signal by modulating a laser beam emitted by the second laser means in accordance with the multiplexed serial data. Item 22. The optical signal transmission method according to any one of Items 21 to 21. 23. The optical signal transmission method according to claim 22, wherein said second laser means is a 1.3 μm band Fabry-Perot laser diode. 24. 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, and a first multiple serial digital data is subjected to a bit multiplexing / combining process to form first composite serial data, and a bit is added to the second multiple serial digital data. The second composite serial data is formed by performing multiplexing and combining processing, the first composite serial data is converted into a first optical signal having a first center wavelength, and the second composite serial data is converted into a second optical signal.
Is converted into a second optical signal having a second center wavelength, the first optical signal and the second optical signal are subjected to multiplexing processing, and the first and second optical signals are converted. Obtaining a multiplexed optical signal based on the signal, sending the multiplexed optical signal to the first optical fiber through the first transmitting / receiving end of the cable, and transmitting the multiplexed optical signal through the first optical fiber to the second transmitting / receiving end Receiving the multiplexed optical signal arriving at the section, performing a demultiplexing process 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. And converting the first reproduced optical signal into first reproduced composite serial data and converting the second reproduced optical signal into second reproduced composite serial data.
A bit separation process is performed on the first reproduced composite serial data to obtain a first plurality of reproduced serial digital data, and a bit separation process is performed on the second reproduced composite serial data to perform a second plurality of reproduction serial digital data. Obtaining serial digital data, multiplexing the third plurality of serial digital data to obtain multiplexed serial data, and converting the multiplexed serial data to a third signal having the first center wavelength or the second center wavelength. Converting the third optical signal into an optical signal, 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 to the first transmitting / receiving end Receiving the third optical signal arriving at the section, converting the transmitted third optical signal into reproduced multiplexed serial data, Data subjected to separation treatment to obtain a third plurality of reproduced serial digital data, optical signal transmission method. 25. The method according to claim 25, wherein the first composite serial data is used for the first
The first composite serial data is converted into a first optical signal by modulating a laser beam emitted by a first laser unit emitting a laser beam having a center wavelength of The second composite serial data is converted into a second optical signal by modulating a laser beam emitted by a second laser unit that emits a laser beam having a second center wavelength in response. The optical signal transmission method according to claim 24. 26. The apparatus according to claim 25, 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 method. 27. The optical system according to claim 24, 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.
7. The optical signal transmission method according to any one of 6. 28. A method according to claim 28, wherein the first plurality of serial digital data comprises first serial digital data and second serial digital data.
28. The optical signal transmission method according to claim 24, wherein the plurality of serial digital data comprises third serial digital data and fourth serial digital data. . 29. The multiplexed optical signal transmitted through the first optical fiber and arriving at the second transmitting / receiving end is subjected to a demultiplexing process using a fiber type wavelength division multiplexing coupler as a demultiplexing means. 29. The optical signal transmission method according to claim 24, wherein first and second reproduced optical signals based on the multiplexed optical signal transmitted through the optical fiber are obtained. 30. Modulating the multiplexed serial data 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. 30. The optical signal is converted into a third optical signal.
The optical signal transmission method according to any one of the above. 31. The optical signal transmission method according to claim 30, wherein said third laser means is a 1.3 μm band Fabry-Perot laser diode. 32. 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 bit multiplexing unit for performing bit multiplexing / combining processing on the first plurality of serial digital data to form composite serial data, and converting the composite serial data into a first optical signal And transmitting the first optical signal to the first optical signal through the first transmitting / receiving end of the cable.
A first electro-optical conversion unit for transmitting the first optical signal to the first optical fiber and receiving the first optical signal transmitted through the first optical fiber and arriving at the second transmitting / receiving end unit; A first photoelectric converter for converting an optical signal into reproduced composite serial data, a bit separator for performing a bit separation process on the reproduced composite serial data to obtain a first plurality of reproduced serial digital data, A data multiplexing unit that multiplexes serial digital data to obtain multiplexed serial data, converts the multiplexed serial data into a second optical signal, and converts the second optical signal into the second optical signal in the cable. A second light-to-light conversion unit for transmitting the light to the second optical fiber through the transmission / reception end, and a second light transmitted through the second optical fiber and arriving at the first transmission / reception end And a second photoelectric conversion unit for converting the transmitted second optical signal into reproduced multiplexed serial data, and performing a separation process on the reproduced multiplexed serial data to form a second plurality of reproduced serial digital signals. An optical signal transmission device configured to include a data separation unit that obtains data. 33. 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 including a second optical fiber, a first bit multiplexing unit for performing bit multiplexing / combining processing on the first plurality of serial digital data to form first composite serial data, and a second plurality of serial digital data. A second bit multiplexing unit for performing bit multiplexing / synthesis processing on the digital data to form second composite serial data; and converting the first composite serial data into a first optical signal having a first center wavelength. A first electro-optical converter, a second electro-optical converter for converting the second composite serial data into a second optical signal having a second center wavelength, the first optical signal and the second optical signal, The optical signal is subjected to multiplexing processing, A multiplexing unit for obtaining a multiplexed optical signal based on the second optical signal and transmitting the multiplexed optical signal to the first optical fiber through the first transmitting / receiving end of the cable; Receiving the multiplexed optical signal transmitted through the second transmission / reception end unit, performing a demultiplexing process on the transmitted multiplexed optical signal, and combining the first reproduced optical signal having the first center wavelength with the first reproduced optical signal. The second
A second demultiplexer for obtaining a second reproduced optical signal having a center wavelength of?, A first photoelectric converter for converting the first reproduced optical signal into first reproduced composite serial data, and a second reproducing device. A second photoelectric conversion unit for converting an optical signal into second reproduced composite serial data; and a first photoelectric conversion unit for performing bit separation processing on the first reproduced composite serial data to obtain a first plurality of reproduced serial digital data. A second bit separation unit for performing a bit separation process on the second reproduced composite serial data to obtain a second plurality of reproduced serial digital data, and a third plurality of serial digital data. A data multiplexing unit that performs multiplexing processing 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 an optical signal to the second optical fiber through the second transmission / reception end of the cable; and a transmission / reception via the second optical fiber to arrive at the first transmission / reception end. A third photoelectric conversion unit that receives the third optical signal and converts the transmitted third optical signal into reproduced multiplexed serial data; and performs a separation process on the reproduced multiplexed serial data to form a third plurality of signals. An optical signal transmission device comprising: a data separation unit for obtaining reproduced serial digital data.