WO2012093431A1 - 光伝送システム - Google Patents
光伝送システム Download PDFInfo
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- WO2012093431A1 WO2012093431A1 PCT/JP2011/006055 JP2011006055W WO2012093431A1 WO 2012093431 A1 WO2012093431 A1 WO 2012093431A1 JP 2011006055 W JP2011006055 W JP 2011006055W WO 2012093431 A1 WO2012093431 A1 WO 2012093431A1
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- light
- unit
- optical transmission
- optical
- detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
Definitions
- the technical field relates to an optical transmission system, and in particular, to detect that a device (a transmitter) having a light emitting element and a device (a receiver) having a light receiving element are connected to each other by an optical transmission path.
- An optical transmission system having the configuration of
- HDMI high-definition multimedia interface
- optical transmission technology which has been used mainly for long distance transmission and high-speed transmission between industrial devices such as routers and supercomputers, to transmission between consumer devices.
- an optical fiber (optical cable) which is an optical transmission path does not emit electromagnetic noise, and therefore, an effect of suppressing electromagnetic noise is also expected.
- hot plug detect HPD
- HPD hot plug detect
- the hot plug function is useful for optical transmission systems for the following reasons.
- a semiconductor laser is mainly used as a light emitting element constituting an optical transmission system.
- the intensity of laser light emitted to the outside of the apparatus is regulated for the purpose of securing safety to the eyes.
- One of the methods to satisfy the regulation is to drive the semiconductor laser so that the intensity of the laser beam emitted from the light emitting element is always equal to or less than the regulation intensity.
- the optical loss of the optical transmission line to be allowed is small.
- the driving of the semiconductor laser is stopped and only when the light emitting element is connected,
- Patent Document 1 discloses a cable connection detection method suitable for an optical transmission system.
- FIG. 20 and FIG. 21 are diagrams illustrating the method described in Patent Document 1.
- an optical communication device 910 including a light emitting element (laser 914) and an optical communication device 920 including a light receiving element (photodetector 921) are connected by an optical fiber cable 930.
- the optical fiber cable 930 includes an optical fiber 932 and further includes conductive wires 931 and 933.
- the optical communication device 910 includes a conduction circuit 915, an impedance 911, and a monitor 912 that monitors the conduction state of the conduction circuit 915.
- the optical communication device 920 includes a conduction circuit 916 and an impedance 922.
- the monitor 912 detects an impedance equal to the impedance when the impedance 911 and the impedance 922 are connected in parallel.
- the output control unit 913 determines that the connection state is normal, and causes the laser 914 to start emitting light at a predetermined intensity.
- the monitor 912 detects an impedance equal to the impedance of the impedance 911 alone.
- the output control unit 913 determines that it is in the non-connected state, and stops the light emission of the laser 914.
- an optical transmission system having a function (connection detection function) of detecting by power consumption.
- a first aspect is an optical transmission system for optically transmitting information between devices via an optical transmission path, wherein excitation light for detecting inter-device connection via the optical transmission path is sent to the optical transmission path
- This is an optical transmission system including an optical transmission signal light transmitting unit that emits light toward the optical transmission path, and an optical transmission signal light receiving unit that receives signal light from the optical transmission path.
- connection detection function is realized with an extremely simple configuration that operates with minimal power consumption, and there is no risk of emitting electromagnetic noise in the operation of the connection detection function.
- Flow chart of connection detection process according to the eighth embodiment Schematic diagram showing a state in which no optical transmission line is connected to a transmitter in an optical transmission system according to Embodiment 9.
- Flow chart of connection detection process according to the ninth embodiment Schematic of optical transmission system according to the prior art (at the time of connection) Schematic of optical transmission system according to the prior art (when not connected)
- the optical transmission system is an optical transmission system capable of optically transmitting desired information (for example, digital data) from a transmission apparatus to a reception apparatus.
- desired information for example, digital data
- the present optical transmission system has a connection detection function for detecting that the transmission apparatus and the reception apparatus are connected by the optical transmission path, that is, a so-called hot plug function. It has composition.
- the configuration for the connection detection function includes a transmitter, a response receiver, a detector, a transmitter, and a receiver, provided in one of the transmitter and the receiver (preferably, the transmitter). And a response unit provided in the other (preferably, the receiving device) or the optical transmission path for receiving the excitation light and emitting the detection light.
- the transmitter emits excitation light toward the light transmission path.
- the response unit receives the excitation light incident through the light transmission path, and emits the detection light toward the light transmission path by using the light energy obtained by the reception of the excitation light.
- the response receiving unit receives the detection light emitted from the response unit and outputs a detection light current. Then, the detection unit detects the connection based on the detected photocurrent.
- connection detection function provided in the optical transmission system according to the present embodiment, electrical energy does not propagate through the connection cable or the like. Therefore, there is no possibility that electromagnetic noise is emitted.
- this connection detection function is realized by an extremely simple configuration and can detect a connection with minimum power consumption.
- detection light can be emitted using only the light energy of the excitation light. Therefore, in the response unit, it is also possible to substantially reduce the power consumption for the operation of the connection detection function.
- FIG. 1 is a block diagram showing the configuration of the optical transmission system 100 according to the first embodiment.
- the optical transmission system 100 includes a transmitter 1, an optical cable 2 as an optical transmission path, and a receiver 3.
- the transmitter 1 includes a light emitting element 109 for signal transmission (hereinafter referred to as “signal transmitter”), and the receiver 3 is for signal reception.
- a light receiving element 303 (hereinafter referred to as a "signal receiving unit") is provided.
- the signal transmission unit 109 is, for example, a semiconductor laser light source.
- the optical cable 2 may be a multi-core optical cable including the first optical fiber 201 and the second optical fiber 203, and the second optical fiber 203 may be mainly used for optical transmission of information such as digital data.
- the signal reception unit 303 is, for example, a photodetector such as a photodiode or a phototransistor.
- the transmission device 1 includes a connection detection light emitting element 101 (hereinafter, referred to as a “transmission unit”) that emits excitation light including light of a predetermined wavelength as a configuration for a connection detection function in addition to the signal transmission unit 109. And a connection detection light receiving element 103 (hereinafter referred to as “response reception unit”) that receives detection light sent from the receiving device 2 via the optical transmission path 2 and outputs detection light current according to the intensity of the detection light. And a connection detection unit 105 (hereinafter referred to as a “detection unit”) that detects the presence or absence of connection based on the detected photocurrent.
- a connection detection light emitting element 101 hereinafter, referred to as a “transmission unit”
- a connection detection light receiving element 103 (hereinafter referred to as “response reception unit”) that receives detection light sent from the receiving device 2 via the optical transmission path 2 and outputs detection light current according to the intensity of the detection light.
- the detection unit 105 outputs the result of connection detection based on the detected photocurrent to the transmission circuit unit 107 as a connection detection signal.
- the transmission circuit unit 107 generates a drive current based on the connection detection signal and a transmission signal (signal representing information such as digital data to be transmitted) received from the outside, and outputs the drive current to the signal transmission unit 109, thereby a signal transmission unit.
- the transmission circuit 107 includes a drive circuit for a laser light source.
- the transmission circuit 107 may include an encoding circuit or the like.
- the signal transmission unit 109 converts the drive current into signal light. The signal light is incident on the second optical fiber 203 and sent to the receiver 3.
- the transmitting unit 101 may be a light emitting diode.
- the transmitting unit 101 emits excitation light including light of a predetermined wavelength toward the light transmission path.
- the excitation light emitted from the transmission unit 101 propagates in the optical transmission path 2.
- the response receiving unit 103 may be a photodetector that outputs a current according to the intensity of incident light.
- the photodetector may be capable of outputting a detection light current according to the intensity of incident light (for example, detection light), and the light detector is, for example, a photodiode or a phototransistor.
- the optical transmission path 2 is a multi-core optical cable as described above, and the first optical fiber 201 is deflected by the excitation light emitted from the transmission unit 101 of the transmission device 1 and the response unit 301 of the reception device 2 Thus, the excitation light (detection light) re-incident on the light transmission path 2 propagates.
- the signal light emitted from the signal transmission unit 109 of the transmission device 1 propagates through the second optical fiber 203.
- the light transmission path 2 may be an optical waveguide.
- the receiver 3 receives the excitation light propagated through the first optical fiber 201 as a configuration for the connection detection function in addition to the signal reception unit 303, and the propagation direction of the excitation light is directed to the direction of the first optical fiber 201. It has a deflection unit 301 (response unit) for deflecting and causing the first optical fiber 201 to be incident as detection light.
- a deflection unit 301 response unit
- the response unit 301 may be a light deflection element, and for example, may be a light reflector that reflects the excitation light emitted from the transmission unit 101 well.
- the light reflector includes, for example, a mirror.
- the excitation light that has entered the response unit 301 is deflected in the direction of the light transmission path 2 by the response unit 301, and reenters the light transmission path 2 (for example, the first optical fiber 201) as detection light.
- the detection light propagates through the optical transmission path 2 and is received by the response reception unit 103 of the transmission device 1.
- the optical transmission path 2 of the optical transmission system 100 may include a third optical fiber (not shown), and the excitation light propagated through the first optical fiber 201 and incident on the response unit 301 is not illustrated by the response unit 301. It may be deflected to be incident on the third optical fiber.
- the response receiving unit 103 of the transmission device 1 may be disposed so as to be able to well receive the light emitted from the third optical fiber (not shown).
- the signal receiving unit 303 outputs a signal light current according to the received signal light.
- the reception circuit unit 305 outputs a reception signal based on the signal light current.
- the receiving circuit unit 305 includes an identification circuit, and may further include a decoding circuit and the like as needed.
- connection detection function will be described with reference to FIGS. 2A, 2B, 2C, and 3.
- the transmission unit 101 of the transmission device 1 emits excitation light 401.
- the transmission circuit unit 107 does not drive the signal transmission unit 109 from the viewpoint of eye safety.
- a light source other than a laser for example, a light emitting diode, as the transmitting unit 101.
- the excitation light 401 emitted from the first optical fiber 201 is one end of the first optical fiber 201. Emanate from and propagate in the air. Therefore, no connection is detected.
- the light emission of the transmission unit 101 is stopped after a predetermined time has elapsed, the power consumed by the transmission device 1 can be reduced.
- the excitation light 401 emitted from the first optical fiber 201 is the receiver 3
- a response unit 301 configured to include a mirror deflects (reflects) excitation light and emits it.
- the reflected light (detection light 403) emitted from the response unit 301 reenters the first optical fiber 201 and is received by the response reception unit 103 of the transmission device 1.
- the response receiving unit 103 outputs a detection light current corresponding to the light intensity of the detection light 403 to the detection unit 105.
- the detector 105 When detecting that the transmitter 1 and the receiver 3 are connected to each other through the optical transmission path 2 based on the detected photocurrent, the detector 105 outputs a connection detection signal indicating connection to the transmitter circuit 107. .
- the transmission circuit unit 107 when the transmission circuit unit 107 receives a connection detection signal indicating connection, the transmission circuit unit 107 generates a drive current based on a transmission signal received from the outside, and outputs the drive current to the signal transmission unit 109. Then, the signal transmission light emitting element 109 receives the drive current and emits the signal light 405. The signal light 405 propagates through the second optical fiber 203 and is received by the signal receiving unit 303 of the receiving device 3. Thus, optical transmission of information is started. At this time, if the light emission of the transmission unit 101 is stopped, the power consumed by the transmission device 1 can be reduced. In this case, the detection unit 105 may continue to output the connection detection signal even after the input of the detection photocurrent is stopped.
- the receiving device 3 receives the excitation light emitted by the transmission unit 101 of the transmitting device 1 and incident through the optical transmission path 2 and receives the received excitation light. Is deflected (reflected) in the propagation direction of the light and sent back to the transmitter 1 as detection light, whereby the response reception unit 103 of the transmitter 1 outputs a predetermined detection photocurrent, and detection of the transmitter 1 is performed based on the detection photocurrent.
- the unit 105 detects a connection with the receiving device 3. When the transmission device 1 detects that the reception device 3 is connected via the optical transmission path 2, the transmission device 1 starts optical transmission of information using the signal transmission unit 109.
- FIG. 3A is a view showing an example of the spectrum characteristic of the excitation light emitted from the transmission unit 101.
- FIGS. 3B and 3C are examples of spectral characteristics of light incident on the response receiving unit 103.
- FIG. 3B is an example diagram of spectrum characteristics of light incident on the response receiving unit 103 when the receiving device 3 is not connected to the optical transmission path 2.
- FIG. 3C is a view showing an example of spectrum characteristics of light incident on the response receiving unit 103 when the receiving device 3 is connected to the optical transmission path 2.
- transmitting unit 101 emits the excitation light 401 having a light intensity peak (intensity P E) at a given wavelength C D.
- the response receiving unit 103 is reflected by reflection at the interface between the transmitting device 1 and the optical transmission path 2.
- the excitation light (background light) 402. In this case, the background light 402 and having a light intensity P BG in the wavelength C D.
- the detection light 403 emitted from the response unit 301 is incident on the response reception unit 103.
- the detection light 403 to have a light intensity P R at a wavelength C D.
- the response receiving unit 103 outputs, to the detecting unit 105, a current (detection photocurrent) having a magnitude corresponding to the light intensity of the incident light (the background light 402 or the detection light 403). Therefore, the detection unit 105 detects that the receiving device 3 is connected to the optical transmission path 2 when there is an input of a current of a predetermined size or more, and connects the transmission circuit unit 107 to the connection. Output a detection signal.
- the detection unit 105 is a transmission circuit when there is an input of a current greater than or equal to the current value of the detection photocurrent output when light of the light intensity threshold Thr is incident on the response reception unit 103.
- a connection detection signal may be output to the unit 107.
- the light intensity threshold Thr may be set to be sufficiently larger than the light intensity P BG of the background light 402 and to be sufficiently smaller than the light intensity P R of the detection light 403.
- the response unit 301 receives the excitation light emitted from the transmission unit 101, and generates detection light using only the light energy of the received excitation light. Thus, the light is re-incident on the light transmission path 2.
- the detection light is received by the response receiving unit 103 and converted into a detection light current according to the intensity of the received light.
- the detection unit 105 detects the connection of the reception device 3 based on the magnitude of the detected photocurrent.
- connection detection can be performed without propagating electrical energy to the connection cable (optical transmission path 2).
- the response unit 301 disposed in the receiving device 3 is configured of a deflection unit 301 that reflects (deflects) the received light. Therefore, the power consumption in the response unit 301 is substantially zero. Therefore, in the optical transmission system 100 according to the present embodiment, the connection detection function is realized with an extremely simple configuration and with minimum power consumption.
- connection detection operation described above may be repeated at predetermined time intervals, and the transmission of signal light may be stopped when the connection is not detected.
- the signal light may have two or more channels.
- the signal transmission unit 109, the second optical fiber 203, and the signal reception unit 303 may be prepared in the same number as the number of channels of signal light.
- Embodiment 2 3-1. Configuration Next, an optical transmission system 100 a according to a second embodiment will be described with reference to FIGS. 4 and 5. Descriptions of configurations and operations similar to those of the other embodiments will be omitted as appropriate.
- the optical transmission system 100a has a wavelength conversion element 301a as the response unit 301a of the reception device 3a.
- the wavelength conversion element 301a absorbs at least a part of the excitation light 401, and emits detection light 403a including light of a wavelength different from the wavelength of the excitation light 401 by the absorbed light energy.
- the response unit 301a can be configured, for example, using a phosphor that absorbs light of at least a part of the wavelength included in the excitation light 401 and emits light of a wavelength longer than the wavelength of the absorbed light.
- the peak wavelength of the detection light 403 a may not be longer than the peak wavelength of the excitation light 401. If the peak wavelength of the excitation light 401 and the peak wavelength of the detection light 403a are different, the optical transmission system 100a according to the present embodiment operates properly. In that case, the response unit 301 may not be a phosphor. In this case, the response unit 301 may be realized using an appropriate wavelength conversion element capable of emitting light of a wavelength shorter than the absorbed light.
- the transmitting device 1a responds to the optical filter 102 (optical filter for response receiving unit) that blocks the excitation light 401 well and transmits the detection light 403a well. It may be provided between the receiving unit 103 and the first optical fiber 201.
- FIG. 5A is an example diagram of spectral characteristics of the excitation light 401 and the detection light 403a.
- Excitation light 401 is light having a peak of light intensity at a wavelength C D.
- Detection light 403a is a light having a peak of light intensity at a wavelength C R.
- the wavelength range of the excitation light 401 and the wavelength range of the detection light 403 a are illustrated so as not to overlap, the excitation light 401 and the detection light 403 a may include a portion that overlaps in the wavelength range.
- the peak wavelength C D of the excitation light 401 and a peak wavelength C R of the detection light 403a is different it is desirable.
- FIG. 5 (b) is a view showing the light transmission characteristic of the light filter 102.
- the optical filter 102 may be designed to transmit the light of the peak wavelength C R of the detection light 403 a well and block the light of the peak wavelength C D of the excitation light 401.
- FIG. 5C is a view showing a characteristic of light incident on the response receiving unit 103.
- the detection light 403a is well incident to the response receiving unit 103, but the excitation light 401 is hardly incident. Therefore, detection of connection / non-connection becomes easy.
- the transmission unit 101 of the transmission device 1a emits excitation light 401.
- the excitation light 401 emitted from the first optical fiber 201 is emitted from one end of the first optical fiber 201 and is transmitted through the air. To propagate.
- the excitation light 401 emitted from the first optical fiber 201 is the response unit 301a (wavelength conversion of the receiver 3a).
- the response unit 301a configured to include a phosphor absorbs at least a part of the excitation light, and uses the absorbed light energy to emit light having a wavelength longer than the wavelength of the absorbed light.
- the fluorescence (detection light 403 a) emitted from the response unit 301 a reenters the first optical fiber 201, passes through the optical filter 102, and is received by the response reception unit 103 of the transmission device 1.
- the response receiving unit 103 outputs a detection light current corresponding to the light intensity of the detection light 403 to the detection unit 105.
- the detector 105 When detecting that the transmitter 1a and the receiver 3a are connected to each other via the optical transmission path 2 based on the detected photocurrent, the detector 105 outputs a connection detection signal indicating connection to the transmitter circuit 107. .
- transmission circuit section 107 When receiving a connection detection signal indicating connection, transmission circuit section 107 generates a drive current based on a transmission signal received from the outside, and outputs the drive current to signal transmission section 109. Then, the signal transmission light emitting element 109 receives the drive current and emits the signal light 405. The signal light 405 propagates through the second optical fiber 203 and is received by the signal receiving unit 303 of the receiving device 3a. Thus, optical transmission of information is started.
- the receiving device 3a absorbs the excitation light emitted from the transmission unit 101 of the transmitting device 1a and incident through the optical transmission path 2 and absorbed.
- the response reception unit 103 of the transmission device 1a outputs a predetermined detection light current, and based on the detection light current,
- the detection unit 105 detects a connection with the reception device 3a.
- the transmitter 1a detects that the receiver 3a is connected via the optical transmission line 2, the transmitter 1a starts optical transmission of information using the signal transmitter 109.
- the excitation light 401 Due to the action of the optical filter 102, the excitation light 401 hardly enters the response receiving unit 103. Therefore, it is possible to detect the connection more accurately than in the first embodiment.
- the response unit 301a absorbs the excitation light emitted from the transmission unit 101, and the detection light 403a is generated using only the light energy of the absorbed excitation light. And re-enter the light transmission path 2.
- connection detection can be performed without propagating electrical energy to the connection cable (optical transmission path 2).
- the response unit 301a disposed in the receiving device 3a includes the wavelength conversion element 301a that absorbs at least a part of the excitation light and emits light of a wavelength different from that of the excitation light. Therefore, the power consumption in the response unit 301a is substantially zero. Therefore, in the optical transmission system 100a according to the present embodiment, the connection detection function is realized with an extremely simple configuration and with minimal power consumption.
- FIG. 6 is a schematic view of an optical transmission system 100b according to the third embodiment.
- the optical transmission system 100b according to the third embodiment has a configuration capable of wavelength-multiplexing and transmitting the excitation light 401, the detection light 403a, and the signal light 405 in the same optical transmission path 2b (optical fiber 2b). .
- FIG. 7 is an example diagram of the spectral characteristics of the excitation light 401, the detection light 403a, and the signal light 405 in the present embodiment.
- Excitation light 401 is light having a peak wavelength C D
- the detection light 403a as with the second embodiment, a light having a peak wavelength C R.
- the signal light 405 is a laser light having a different peak wavelength C S is the wavelength C D and the wavelength C R.
- the transmitter 1b includes a first light wavelength multiplexing / demultiplexing filter 111 for multiplexing or demultiplexing light.
- the first optical wavelength multiplexing / demultiplexing filter 111 includes an optical filter 102a for the transmitter between the transmitter 101 and the optical transmission line 2b, and light for the response receiver between the response receiver 103 and the optical transmission line 2b.
- a filter 102 is provided, and an optical filter 102 b for signal transmission unit is provided between the signal transmission unit 109 and the optical transmission line 2 b.
- FIG. 8A is a light transmission characteristic diagram of the transmission unit optical filter 102a.
- transmitting portions optical filter 102a is well transmits light of a peak wavelength C D of the excitation light, hardly transmit light with a peak wavelength C S peak wavelength C R and the signal light 405 of the detection light 403a. Therefore, the excitation light 401 can be incident on the optical transmission path 2b without loss.
- FIG. 8B is a light transmission characteristic diagram of the response receiving unit optical filter 102.
- the response receiving unit for optical filter 102 may transmit light of peak wavelength C R of the detection light 403a, hardly transmit light with a peak wavelength C S peak wavelength C D and the signal light 405 of the excitation light . Therefore, only the detection light 403a can be made incident on the response receiving unit 103, and detection of connection / non-connection can be performed easily and accurately.
- FIG. 8C is a light transmission characteristic diagram of the optical filter 102b for signal transmission unit.
- the optical filter 102 b for the signal transmission unit transmits the light of the peak wavelength C S of the signal light 405 well, and hardly transmits the light of the peak wavelength C R of the detection light 403 a and the peak wavelength C D of the excitation light. . Therefore, the signal light 405 can be incident on the optical transmission path 2b without loss.
- the receiver 3 b has a second light wavelength multiplexing / demultiplexing filter 307 for multiplexing or demultiplexing the light.
- the second optical wavelength multiplexing / demultiplexing filter 307 includes an optical filter 309a for response unit between the response unit 301a and the optical transmission line 2b, and light for signal receiving unit between the signal reception unit 303 and the optical transmission line 2b.
- a filter 309 b is provided.
- FIG. 9A is a light transmission characteristic diagram of the response light filter 309a.
- optical filters 309a for response unit well transmits light of a peak wavelength C R peak wavelength C D and the detection light 403a of the excitation light, hardly transmit light with a peak wavelength C S of the signal light 405. Therefore, the excitation light 401 can enter the response unit 301a without loss, and the detection light 405 emitted from the response unit 301a can also enter the light transmission path 2b without loss.
- FIG. 9B is a light transmission characteristic diagram of the optical filter 309 b for signal receiving unit.
- the signal receiving unit optical filter 309 b transmits the light of the peak wavelength C S of the signal light 405 well, and hardly transmits the light of the peak wavelength C D of the excitation light and the peak wavelength C R of the detection light 403 a. . Therefore, the signal light 405 can be incident on the signal receiving unit 103 without loss.
- connection detection can be performed also in the optical transmission system 100b according to the present embodiment.
- connection detection and optical transmission of information can be performed using a single optical transmission line 2b. With such a configuration, the number of optical fibers (optical transmission paths) inside the optical cable can be reduced.
- a configuration for activating the signal receiving unit 303 and the receiving circuit unit 305 of the receiving device 3c in response to the reception of the excitation light is added.
- the receiving device 3c includes a solar cell 311 in the response unit 301a in addition to the wavelength conversion element 301a.
- the solar cell 311 absorbs at least a part of the excitation light to generate an electromotive force.
- the output voltage or output current from the solar cell 311 is input to the feed control unit 313.
- the feed control unit 313 monitors the input from the solar cell 311 and monitors the presence or absence of reception of the excitation light 401 by the solar cell 311. Further, the power supply control unit 313 can control on / off of power supply to the signal receiving unit 303 and the receiving circuit unit 305.
- the power supply control unit 313 When the power supply control unit 313 confirms that the solar cell 311 receives the excitation light 401, it determines that the receiving device 3c and the transmitting device 1a are connected by the light transmission path 2, and the signal receiving unit 303 and the receiving circuit unit 305. Start supplying power to the
- FIG. 11 is a schematic view showing a modified example 100d of the optical transmission system according to the fourth embodiment.
- the optical transmission system 100d includes a power supply control unit 313, as with the optical transmission system 100c.
- the feed control unit 313 monitors the output from the signal reception unit 303.
- the feed control unit 313 monitors the presence or absence of light reception of the signal light 405 in the signal reception unit 303.
- the power supply control unit 313 controls power supply to the signal receiving unit 303 and the receiving circuit unit 305 in a non-powered state until the signal receiving unit 303 confirms that the signal light 405 is received.
- the power supply monitoring unit 313 starts power supply to the signal receiving unit 303 and the receiving circuit unit 305.
- the signal receiving unit 303 (for example, a photodetector) in a non-powered state does not have a response speed enough to obtain a high-speed signal waveform, it is sufficient for detecting the presence or absence of signal light. If the weak signal light current output from the signal reception unit 303 in a non-power feeding state is monitored by the power supply control unit 213 and the signal light current is detected, the power supply control unit 313 sends the signal reception unit 303 and the reception circuit unit 305 By starting the power feeding, the signal receiving unit 303 and the receiving circuit unit 305 can be activated only at the time of signal transmission.
- the power feeding control unit 313 more reliably detects the presence or absence of the signal light by the transmitting device 1a making the intensity of the signal light greater than that at the time of normal signal transmission for a predetermined period from the start of transmission of the signal light. Will be able to The predetermined period may be longer than the period required for the feed control unit 313 to detect a weak signal light current.
- optical transmission system 200 it is possible to determine the type of the connected receiving apparatus in addition to the detection of the connection.
- the transmission device 1c can detect that the reception device is connected, and can further determine the type of the reception device. For example, with respect to a plurality of types of receiving devices having different receivable transmission rates or different signal formats, it is possible to determine the types of connected receiving devices and cope with optical transmission with different types of receiving devices. .
- FIG. 12 is a schematic view illustrating an outline of the optical transmission system 200 according to the present embodiment.
- a configuration for coping with two types of receiving devices is shown.
- the types of receiving apparatuses that can be supported are not limited to two. It is easy for those skilled in the art to support three or more types of receiving devices, as the following description can be read.
- the transmitter 1c of the optical transmission system 200 includes a plurality of (two) response receivers (a first response receiver 103a and a second response receiver 103b).
- the optical wavelength multiplexing / demultiplexing filter 111 a is disposed between the response receiving units 103 a and 103 b and the optical transmission path 2.
- the optical wavelength multiplexing / demultiplexing filter 111a includes the first response receiving unit optical filter 102 between it and the first response receiving unit 103a, and the second response receiving unit optical filter 102c between it and the second response receiving unit 103b. Equipped with
- the first response receiver optical filter 102 is an optical filter that transmits light in the vicinity of a predetermined first wavelength well and blocks the remaining light well.
- the second response receiver optical filter 102 c is an optical filter that transmits light in the vicinity of a predetermined second wavelength well and blocks the remaining light well.
- the light wavelength multiplexing / demultiplexing filter 111a As the light wavelength multiplexing / demultiplexing filter 111a, a prism that separates light for each wavelength, an arrayed waveguide type optical filter, or the like may be used.
- the receiving device includes a response unit capable of emitting the detection light of the wavelength band associated with the type of the receiving device in order to be able to distinguish the type of the receiving device.
- the first type reception device 3a1 includes, as a response unit, a first wavelength conversion element 301a1 that absorbs the excitation light 401 and emits light in the vicinity of a predetermined first wavelength. Therefore, when receiving the excitation light 401, the first type reception device 3a1 emits light in the vicinity of a predetermined first wavelength as the first detection light 403a1.
- the first detection light 403a1 incident on the transmission device 1c passes through the first response receiving unit optical filter 102, but does not pass through the second response receiving unit optical filter 102c. Therefore, the first detection light 403a1 enters only the first response receiver 103a.
- the detection unit 105a inputs the detected photocurrent having a magnitude equal to or larger than a predetermined value only from the first response reception unit 103a.
- the detecting unit 105a outputs, to the transmitting circuit unit 107a, a first connection detection signal indicating that the first type receiving device 3a1 is connected.
- the transmission circuit unit 107a that has received the first connection detection signal drives the signal transmission unit 109 to transmit signal light suitable for the first type reception device 3a1.
- the signal suitable for the first type receiving device 3a1 is a signal suitable for the signal type and the transmission rate of the first type receiving device 3a1.
- Information on the signal format and transmission rate suitable for the first type reception device 3a1 may be stored in the detection unit 105a or the transmission circuit unit 107a in advance.
- the second type reception device 3a2 includes, as a response unit, a second wavelength conversion element 301a2 that absorbs the excitation light 401 and emits light in the vicinity of a predetermined second wavelength. Therefore, when receiving the excitation light 401, the second type reception device 3a2 emits light in the vicinity of a predetermined second wavelength as the second detection light 403a2.
- the second detection light 403a2 incident on the transmission device 1c passes through the second response receiving unit optical filter 102c, but does not pass through the first response receiving unit optical filter 102. Therefore, the second detection light 403a2 enters only the second response receiving unit 103b.
- the detection unit 105a inputs the detected photocurrent having a magnitude equal to or larger than a predetermined value only from the second response reception unit 103b.
- the detecting unit 105a outputs, to the transmitting circuit unit 107a, a second connection detection signal indicating that the second type receiving device 3a2 is connected.
- the transmission circuit unit 107a that receives the second connection detection signal drives the signal transmission unit 109 to transmit signal light suitable for the second type reception device 3a2.
- the detecting unit 105a can determine the type of the connected receiving apparatus based on the difference in the wavelength of the detection light received by the response receiving units (103a and 103b).
- corresponds to two types of receiving apparatuses (3a1, 3a2) was demonstrated above, three or more types of corresponding receiving apparatuses may be sufficient.
- the wavelength of the detection light the same number of different wavelengths as the type of the receiving device are allocated to each type of the receiving device.
- the response receiving units (103a, 103b) may be prepared in the same number as or more types of receiving apparatuses.
- two or more channels of signal light may be present as in the previous embodiments.
- the number of signal transmission units, optical transmission paths, signal reception units, etc. may be prepared equal to the number of signal light channels. Furthermore, it is possible to cope with the case where the number of channels of signal light differs depending on the type of receiver. Further, as described in the previous embodiment, the excitation light, the detection light, and the signal light may be wavelength-multiplexed.
- the function of activating the signal receiving unit and the receiving circuit unit can be added only when receiving the excitation light and when receiving the signal light.
- the function of determining the type of the receiving apparatus can be realized with an extremely simple configuration.
- the optical transmission system 100e includes an optical filter 301b as a response unit of the receiving device 3e.
- the optical filter 301 b is an optical filter having wavelength dependency in light reflectance (or light transmittance).
- Light reflectance of the optical filter 301b is in a wavelength band having a peak wavelength of C D vicinity of the excitation light 401, that the transmission device 1b is the receiving device 3e receives reflected light (detection light) from the optical filter 301b is connected The value is set so as to obtain reflected light of high intensity that can be detected.
- the light reflectance of the optical filter 301b is the peak wavelength C S wavelength band in the vicinity of the signal light 405 is set to a low value enough to be data transmitted using the optical signal 405 from the transmitter 1b to the receiver 3e Ru.
- the transmission device 1b may receive device 3e receives reflected light (detection light) from the optical filter 301b is connected is set to a low value enough to detect.
- the light transmittance of the optical filter 301b is the peak wavelength C S wavelength band in the vicinity of the signal light 405, using the signal light 405 from the transmission device 1b to the receiver 3e Set to a value high enough to transmit data
- optical filter 301b a fiber grating filter
- another type of optical filter may be used.
- FIG. 15 is a diagram showing the characteristics of the excitation light 401 and the signal light 405, and the characteristics of the light reflectance and the light transmittance of the optical filter 301b.
- the excitation light 401 has a peak of light intensity at a wavelength C D
- the signal light 405 has a peak of light intensity at a wavelength C S.
- Wavelength C D and the wavelength C S may be different, no limitation on the size relationship between them.
- the light reflectance of the optical filter 301b is high near the wavelength C D and relatively low near the wavelength C S. This indicates that the optical filter 301 b has a characteristic of reflecting the excitation light 401 well and hardly reflecting the signal light 405.
- FIG. 15C shows the light transmittance of the optical filter 301c. As described above, this indicates that the optical filter 301 b transmits the signal light 405 well while hardly transmitting the excitation light 401.
- the transmitter unit 101 of the transmitter 1b emits excitation light 401.
- the excitation light 401 is emitted from one end of the optical fiber 201.
- the excitation light 401 emitted from the optical fiber 201 is incident on the response unit 301b (optical filter) of the receiver 3e.
- the optical filter 301 b reflects the excitation light.
- the reflected light propagates in the optical fiber 201 as the detection light 403 toward the transmission device 1 b and enters the response reception unit 103 of the transmission device 1 b.
- the operation until the signal transmission unit 109 outputs the signal light after the detection light 403 is input to the response reception unit 103 is the same as the operation in the above embodiment.
- the response unit 301b receives the excitation light 401 emitted from the transmission unit 101, and the detection light 403 is received using only the light energy of the received excitation light. It generates and re-enters the light transmission path 2b.
- the detection light 403 is received by the response receiving unit 103 and converted into a detection light current according to the intensity of the received light.
- the detection unit 105 detects the connection of the reception device 3e based on the magnitude of the detected photocurrent.
- connection detection can be performed without propagating electrical energy to the connection cable (optical transmission path 2b).
- the response unit 301b disposed in the receiving device 3e since the response unit 301b disposed in the receiving device 3e generates the detection light 403 by reflecting the received light, the power consumption in the response unit 301b is substantially zero.
- the optical filter 301 b has optical characteristics such that the excitation light 401 (detection light 403) and the signal light 405 can be separated. Thus, the excitation light 401 (detection light 403) and the signal light 405 can be transmitted by one optical fiber 201.
- the excitation light 401 detection light 403
- the signal light 405 can be transmitted together by one optical fiber 201
- the number of optical fibers is smaller than that of the first embodiment and the hot plug is used. Function and signal transmission can be realized.
- the optical transmission system 100f has a characteristic configuration in the optical transmission path 2c.
- the optical transmission line 2c according to the present embodiment is provided with a lid 211 which can be opened and closed at least at one end.
- the lid portion 211 has a function of blocking the emission of the signal light 405 propagated from the other end to the light transmission path 2 c to the outside.
- the lid 211 does not block the signal light 405 when it is in the open position.
- the lid portion 211 is moved from the closed position to the open position by the interaction with the device to be engaged by connecting the end of the light transmission path 2c with which it is provided to the device such as the receiving device 3f.
- the mechanical configuration for realizing this action may be realized based on the prior art.
- the movement between the closed position and the open position of the lid portion 211 may be configured to be manually performed by the user or the like.
- the lid portion 211 may be configured to be removable from the light transmission path 2c.
- the closed and open positions may be realized by other than mechanical action.
- a response unit 212 is provided on the inner side of the lid 211 (the side facing the optical fiber 201 in the closed position). When receiving the excitation light 401, the response unit 212 can emit the detection light 403a (or 403) by using the light energy of the excitation light 401.
- the optical characteristics of the response unit 212 here may be similar to those of the response unit 301, 301a or 301b in the other embodiments.
- the response unit is disposed on the receiving device side, but in the present embodiment, the response unit 212 is disposed at the lid 211, that is, at least one end of the light transmission path 2c. Therefore, the receiving apparatus according to the present embodiment does not need to include a response unit in particular.
- FIG. 16A is a diagram showing a state in which the transmission device 1 and one end of the light transmission path 2c are connected, and the other end of the light transmission path 2c is not connected to the device.
- the lid portion 211 of the light transmission path 2c is in the closed position. Therefore, even if the signal transmission unit 109 emits the signal light, the signal light is blocked by the lid portion 211, so the signal light does not leak to the outside.
- the excitation light 401 enters one end of the optical transmission line 2c, propagates through the optical fiber 201, and the other light transmission line 2c.
- the light is incident on the response unit 212 at the end.
- the response unit 212 emits the detection light 403.
- the detection light 403 emitted from the response unit 212 propagates through the optical fiber 201 and is received by the response reception unit 103 of the transmission device 1.
- the detection unit 105 of the transmission device 1 detects the detection light current having a predetermined intensity or more from the response reception unit 103 when the oscillation unit 101 emits the excitation light 401. When it is determined that the device is not connected to the other end of the optical transmission line 2c. In this state, the detection unit 105 does not output a connection detection signal indicating connection to the transmission circuit unit 107.
- FIG. 16B is a diagram showing a state in which the transmitter 1 and the receiver 3f are connected via the optical transmission path 2c.
- the lid 211 is automatically moved to the open position by the mechanical interaction with the device when the end at which the lid 211 is disposed is connected to the device.
- the automatic opening / closing mechanism of the lid portion 211 is realized by the mechanical mechanism provided in the lid portion 211 interacting with the mechanism of the connection portion of the device.
- the excitation light 401 enters one end of the optical transmission line 2c, propagates through the optical fiber 201, and the other light transmission line 2c. The light enters the receiver 3 f from the end.
- the detection unit 105 of the transmission device 1 transmits the light transmission path 2c when the detection light current having a predetermined intensity or more is not input from the response reception unit 103 although the oscillation unit 101 emits the excitation light 401. It detects that the device is connected to the other end of. At this time, the detection unit 105 outputs a connection detection signal indicating connection to the transmission circuit unit 107.
- the excitation light 401 is incident on the signal reception unit 303 of the reception device 3 f.
- the signal reception unit 303 outputs an electrical signal corresponding to the light energy of the excitation light 401 to the reception circuit unit 305.
- the reception circuit unit 305 detects the connection with the transmission device 1 based on the electrical signal.
- the hot plug function can be easily realized also in the receiving device 3 f.
- the transmission circuit unit 107 that has received the connection detection signal generates a drive current based on the transmission signal received from the outside, and outputs the drive current to the signal transmission unit 109. Then, the signal transmission light emitting element 109 receives the drive current and emits the signal light 405. Thus, optical transmission of information is started.
- the transmission system 100f includes the lid 211 in the light transmission path 2c, and includes the response unit 211 that receives the excitation light 401 and emits the detection light 403 in the lid 211.
- the cover unit 211 can transmit the signal light 405 even if an event such as the signal light 405 is output due to a malfunction of the transmitter 1 in a state where the optical transmission line 2c is not connected to the receiver 3f. Does not harm the user because it does not emit light to the outside.
- the response unit 212 since the response unit 212 is disposed in the optical transmission path 2c, the receiving device 3f does not have to have a configuration corresponding to the response unit.
- the signal light 405 output from the transmitter 1 is not output from the other end of the optical transmission path 2c to the outside when the receiver 3f is not connected due to the action of the lid 211.
- the excitation light 401 may be output to the light emitting element 109 for signal transmission.
- the excitation light 401 and the signal light 405 may have the same wavelength, or both may be different.
- the intensities of the excitation light 401 and the signal light 405 may be the same or different.
- the lid portion 211 is disposed only at one end of the light transmission path 2c, but the lid portion 211 may be disposed at both ends of the optical transmission path 2c.
- the transmitting device 1 includes a mechanism for causing the lid portion 211 to shift from the closed state to the open state when the light transmission path 2c is connected.
- the transmission system according to the present embodiment is characterized in control of the timing of execution of connection detection processing by the transmission apparatus.
- the transmission system according to the eighth embodiment may have the same configuration as the transmission system according to the other embodiments.
- the transmission devices (1, 1a, 1b, 1c, etc.) in the present embodiment have an operation unit and an operation detection unit (not shown).
- the operation unit is a user interface that allows the user to input an instruction or the like to the transmission device
- the operation detection unit is a circuit that detects an operation performed on the operation unit.
- the transmission device determines whether the operation detection unit starts connection detection processing by detecting that the user has input an instruction or the like via the operation unit, and the reception device is connected or not To judge.
- the transmission device in the present embodiment performs connection detection processing of the reception device when the user operates the operation button. This reduces the frequency of execution of the connection detection process, thereby extending the device life of the device and reducing the probability of failure.
- the operation unit of the transmission device may be an operation button of the transmission device or an operation button of the remote control of the transmission device.
- the transmission device can receive the operation content performed by the user with respect to the remote controller of another device from the other device via a predetermined communication path
- the remote controller may also be included in the operation unit of the transmission device. it can.
- FIG. 17 is a flowchart of processing performed by the transmission device according to this embodiment for determining the start of reception device connection detection processing.
- the transmission apparatus When the power supply of the transmission apparatus is turned on, the transmission apparatus performs a predetermined power-on operation (S1).
- the transmission device that has completed the power-on operation executes the connection detection process (S2, S3) of the reception device as in the first embodiment and the like.
- the transmission apparatus starts output of excitation light (S2).
- the transmission apparatus determines the presence or absence of connection of the reception apparatus based on the presence or absence of detection of the detection light. If the connection of the receiving device is detected (“YES” in step S3), the transmitting device stops outputting the excitation light (S6), starts outputting signal light, and performs data transmission (S7). When the connection of the receiving device is not detected (“NO” in step S3), the transmitting device stops the output of the excitation light (S4) and detects the connection of the receiving device until the button operation of the operation unit is detected. Do not (S5).
- step S5 When the transmission device detects a button operation of the operation unit ("YES" in step S5), the transmission device again executes connection detection processing of the reception device (the process returns from step S5 to step S2).
- the transmitting device repeats the loop of steps S2 to S5 until the connection of the receiving device is detected.
- the transmission device detects a user operation, it can start connection detection processing for the reception device, and can start communication with the reception device if a connection is detected. Therefore, the transmission device does not cause the user to feel inconvenience.
- the frequency of execution of the connection detection process can be reduced in comparison with a configuration in which the connection detection process is executed at regular intervals, and therefore, the burden of the device concerning the same process can be reduced.
- the device life can be reduced and the probability of occurrence of failure can be reduced.
- the processing for connection detection of the receiving apparatus described in steps S2 to S6 and the like may be performed according to any configuration and procedure of the first to seventh embodiments.
- Embodiment 9 10-1 Configuration Finally, an optical transmission system 100g according to a ninth embodiment will be described with reference to FIGS. 18A, 18B, and 19.
- the transmission system 100g according to the present embodiment is characterized in the configuration of the transmission apparatus and control of the timing of execution of connection detection processing performed by the transmission apparatus. Specifically, it is possible for the transmitting device to determine the presence or absence of the optical transmission path connected thereto, and when the optical transmission path connected thereto does not exist, the transmitting device Do not perform connection detection processing.
- the transmission system according to the ninth embodiment may have the same configuration as the transmission system according to the other embodiments.
- the transmitter 1 d according to the present embodiment may have an operation unit as the transmitter according to the eighth embodiment. When the transmission apparatus has the operation unit, the control of the timing of the start of the connection detection process similar to that of the eighth embodiment is also possible in the present embodiment.
- the transmitter 1 d includes a mechanical switch 112 and a cable detection unit 113 as an optical transmission path connection detection mechanism.
- the transmitting device 1d may have the same configuration as the transmitting device (1, 1a, 1b or 1c) according to the other embodiment.
- the optical transmission line connection detection mechanism is based on the switch 112 which is switched on / off depending on the presence / absence of connection of the optical transmission line, and the presence / absence of connection of the optical transmission line based on the on / off (or off / on) of the switch 112 And a cable detection unit 113 for detecting the
- FIG. 18B is a diagram showing an optical transmission system 100g in a state where the transmission device 1 and one end of the optical transmission path 2b are connected, and the other end of the optical transmission path 2b is connected to the reception device 3e.
- the transmission device 1 d changes the state of the switch 112 as the light transmission path 2 b is connected, and the cable detection unit 113 detects the change to detect the connection of the light transmission path 2 b.
- the configuration of the optical transmission line connection detection mechanism shown in FIGS. 18A and 18B is merely an example.
- the mechanism is not limited to this example as long as it can determine the presence or absence of the connection of the optical transmission line.
- FIG. 19 is a flowchart of processing performed by the transmission device 1d according to the present embodiment for determining the start of reception device connection detection processing.
- the transmission apparatus executes the connection detection process of the reception apparatus when the power is turned on.
- the transmission device 1d according to the present embodiment does not start the connection detection process of the reception device substantially simultaneously with the power on.
- the transmission device 1d subsequently determines the presence or absence of the connected cable (optical transmission path 2b) (S12).
- step S12 If the transmitter 1d determines that there is no cable (optical transmission line 2b) connected ("NO" in step S12), it waits (S13).
- the transmission device 1d executes the connection detection process (S14, S15) of the reception device for the first time.
- steps S14, S15, S16, S17, S18, and S19 are the same as steps S2, S3, S4, S5, S6, and S7 (FIG. 17) described in the eighth embodiment, respectively.
- the description is omitted.
- the transmitter 1 d can detect the presence or absence of the connected optical transmission path 2 b, and when the optical transmission path 2 b is not connected, the transmitter 1 d for detecting the connection of the receiver Do not process. By doing so, the transmitter 1 d can save the power consumed by the connection detection of the receiver. Further, as in the eighth embodiment, the transmission device 1d can also extend the life of the device and reduce the probability of occurrence of failure.
- the processing for connection detection of the receiving apparatus described in steps S14 to S18 and the like may be performed according to any of the configurations and procedures of the first to seventh embodiments.
- the excitation light when the transmission device and the reception device are connected via the optical transmission path, the excitation light is transmitted via the optical transmission path. Incident on the response unit.
- the excitation light when the transmission device and the reception device are not connected via the optical transmission path, the excitation light enters the response unit via the optical transmission path.
- the configuration of the response unit or the like may be any configuration of the first to seventh embodiments.
- the response unit utilizes the light energy of the excitation light to form an optical transmission line. It emits detection light toward the camera. The detected light is incident on the response receiver. The response receiving unit outputs a detection light current when receiving the detection light.
- the detection unit detects that the transmission device and the reception device are connected to each other based on the connection detection signal.
- the connection detection unit can detect connection / non-connection (non-connection / connection in the seventh embodiment) depending on whether the level of the detected photocurrent is above or below a predetermined threshold.
- connection detection function is realized with a configuration that does not use any conductive wire. Therefore, the suppression effect of the electromagnetic noise which is one of the advantages of the optical transmission system is not impaired by the operation of the connection detection function.
- the connection detection function is composed of a transmission unit, a response unit, a response reception unit, and a detection unit, so that the configuration is extremely compact and advantageous in cost. Further, the response unit that can be used in the present embodiment can operate without consuming power. Therefore, the power consumed by the operation of the connection detection function can be suppressed low.
- the hot plug function and the data signal transmission can be performed with one optical fiber cable by the action of the optical filter that separates the light for each wavelength.
- the safety for the eyes of the user is improved by providing the openable and closable lid portion capable of blocking the signal light on at least one end of the light transmission path.
- the hot plug function and data signal transmission can be performed with one optical fiber cable.
- the timing and frequency of execution of processing for connection detection of the reception device performed by the transmission device are optimized. Therefore, a further power consumption reduction effect, an effect of extending the device life, and a reduction effect of failure occurrence probability can be obtained.
- the present embodiment is an optical transmission system capable of detecting a connection between a transmitter and a receiver.
- the present embodiment is useful in the field of light transmission.
- Optical transmission system 100f Optical Transmission system 100g ⁇ Optical transmission system 101 ⁇ Transmission unit 102 ⁇ First response receiver optical filter 102a ⁇ ⁇ ⁇ Oscillator optical filter 102b ⁇ ⁇ ⁇ Signal transmission Optical filter for receiver 102c ... Optical filter for second response receiver 103 ... Response receiver 103a ... First response receiver 103b ... Second response receiver 105 ...
- Detector 105a ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Detection section 107 ⁇ ⁇ ⁇ Transmission circuit section 107 ⁇ ⁇ ⁇ Transmission circuit section 109 ⁇ ⁇ ⁇ Signal transmission section 111 ⁇ ⁇ ⁇ Optical wavelength multiplexing / demultiplexing filter 111a ⁇ ⁇ ⁇ Optical wavelength multiplexing / demultiplexing filter 112 ⁇ ⁇ ⁇ Switch 113 ⁇ Cable detection unit 200 ⁇ Optical transmission system 201 ⁇ First optical fiber 203 ⁇ Second optical fiber 211 ⁇ Lid section 212 ⁇ Response section 301 ⁇ Optical deflection Element (Reflector) 301a ⁇ ⁇ ⁇ Wavelength conversion element (phosphor) 301a1 ⁇ First wavelength conversion element 301a2 ⁇ ⁇ ⁇ Second wavelength conversion element 301b ⁇ Optical filter (fiber grating filter) 303: Signal reception unit 305: Reception circuit unit 307: Optical wavelength multiplexing / demultiplex
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Abstract
Description
以下に説明する各実施の形態に係る光伝送システムは、送信装置から受信装置へ所望の情報(例えば、デジタルデータ)を光伝送可能な光伝送システムである。本光伝送システムは、情報の光伝送機能に加え、送信装置と受信装置とが光伝送路によって接続されていることを検出するための接続検出機能、即ち、所謂ホットプラグ機能を実現するための構成を備える。
2-1.構成
図1は、実施の形態1の光伝送システム100の構成を示すブロック図である。光伝送システム100は、送信装置1、光伝送路としての光ケーブル2、および、受信装置3を含んで構成される。
次に、接続検出機能の動作について、図2A、図2B、図2C、および、図3を参照して説明する。
3-1.構成
次に、図4および図5を参照し、実施の形態2に係る光伝送システム100aについて説明する。なお、他の実施の形態と同様の構成および動作については、適宜説明を省略する。
実施の形態1と同様、接続検出の際、送信装置1aの発信部101は、励起光401を出射する。
4-1.構成
次に、図6乃至図9を参照し、実施の形態3に係る光伝送システム100bについて説明する。なお、他の実施の形態と同様の構成および動作については、適宜説明を省略する。
先の実施の形態と同様に、本実施の形態に係る光伝送システム100bにおいても、接続検出を行うことができる。本実施の形態においては、単一の光伝送路2bを用いて、接続の検出と、情報の光伝送と、を行うことができる。このような構成とすることで、光ケーブル内部の光ファイバ(光伝送路)の本数を削減することができる。
5-1.構成
次に、図10を参照し、実施の形態4に係る光伝送システム100cについて説明する。なお、他の実施の形態と同様の構成および動作については、適宜説明を省略する。
図11は、実施の形態4に係る光伝送システムの変形例100dを示す模式図である。
6-1.構成
次に、図12、図13A、および、図13Bを参照し、実施の形態5に係る光伝送システム200について説明する。
図13Aを参照すれば、第1種受信装置3a1の構成が模式的に示されている。第1種受信装置3a1は、応答部として、励起光401を吸収して所定の第1波長近傍の光を出射する第1波長変換素子301a1を備える。よって、第1種受信装置3a1は、励起光401を受光すると、所定の第1波長近傍の光を第1検出光403a1として出射する。
7-1.構成
次に、図14および図15を参照し、実施の形態6に係る光伝送システム100eについて説明する。なお、他の実施の形態と同様の構成および動作については、適宜説明を省略する。
接続検出の際、送信装置1bの発信部101は、励起光401を出射する。
8-1.構成
次に、図16A、図16B、および、図16Cを参照し、実施の形態7に係る光伝送システム100fについて説明する。なお、他の実施の形態と同様の構成および動作については、適宜説明を省略する。
図16Aは、送信装置1と光伝送路2cの一端とが接続され、光伝送路2cの他端が機器に接続されていない状態を示す図である。この状態では、光伝送路2cの蓋部211は、閉鎖位置にある。したがって、仮に信号送信部109が信号光を出射しようとも、信号光は蓋部211によって遮断されるため、信号光が外部へ漏れることはない。
9-1.構成
本実施の形態にかかる伝送システムは、送信装置による接続検出処理の実施のタイミングの制御に特徴を有する。この特徴以外の構成については、実施の形態8に係る伝送システムは、他の実施の形態による伝送システムと同様の構成を有せばよい。ただし、本実施の形態における送信装置(1、1a、1b、1c等)は、図示しない操作部および操作検出部を有する。操作部とは、ユーザが送信装置に対して指示等を入力可能なユーザインタフェースであり、操作検出部とは、操作部に対してなされた操作を検出する回路である。
図17は、本実施の形態に係る送信装置がする、受信装置接続検出処理の開始を判断するための処理のフローチャートである。
10-1.構成
最後に、図18A、図18B、および、図19を参照し、実施の形態9にかかる光伝送システム100gについて説明する。
図18Bは、送信装置1と光伝送路2bの一端とが接続され、光伝送路2bの他端に受信装置3eが接続された状態の光伝送システム100gを示す図である。このように、送信装置1dは、光伝送路2bの接続に伴いスイッチ112の状態が変化し、当該変化をケーブル検出部113で検知することで、光伝送路2bの接続を検出する。
このように、実施の形態1~6、8、および、9においては、送信装置と受信装置とが光伝送路を介して接続されている場合には、励起光は、光伝送路を介して応答部へ入射する。逆に、実施の形態7~9においては、送信装置と受信装置とが光伝送路を介して接続されていない場合に、励起光は、光伝送路を介して応答部へ入射する。(実施の形態8および9においては、応答部等の構成は、実施の形態1~7のいずれの構成であってもよい。)応答部は、励起光の光エネルギを利用して光伝送路へ向けて検出光を出射する。検出光は、応答受信部へ入射する。応答受信部は、検出光を受けると検出光電流を出力する。検出部は、当該接続検出信号に基づき送信装置と受信装置とが互いに接続されていることを検出する。例えば、接続検出部は、検出光電流のレベルが所定の閾値以上か、未満か、で接続/非接続(実施の形態7においては非接続/接続)を検出することができる。
1a・・・ 送信装置
1b・・・ 送信装置
1c・・・ 送信装置
2 ・・・ 光伝送路
2b・・・ 光伝送路
2c・・・ 光伝送路
3 ・・・ 受信装置
3a・・・ 受信装置
3a1・・ 第1種受信装置
3a2・・ 第2種受信装置
3b・・・ 受信装置
3c・・・ 受信装置
3d・・・ 受信装置
3e・・・ 受信装置
3f・・・ 受信装置
100 ・・・ 光伝送システム
100a・・・ 光伝送システム
100b・・・ 光伝送システム
100c・・・ 光伝送システム
100d・・・ 光伝送システム
100e・・・ 光伝送システム
100f・・・ 光伝送システム
100g・・・ 光伝送システム
101 ・・・ 発信部
102 ・・・ 第1応答受信部用光フィルタ
102a・・・ 発振部用光フィルタ
102b・・・ 信号送信部用光フィルタ
102c・・・ 第2応答受信部用光フィルタ
103 ・・・ 応答受信部
103a・・・ 第1応答受信部
103b・・・ 第2応答受信部
105 ・・・ 検出部
105a・・・ 検出部
107 ・・・ 送信回路部
107a・・・ 送信回路部
109 ・・・ 信号送信部
111 ・・・ 光波長合分波フィルタ
111a・・・ 光波長合分波フィルタ
112 ・・・ 機械式スイッチ
113 ・・・ ケーブル検出部
200 ・・・ 光伝送システム
201 ・・・ 第1光ファイバ
203 ・・・ 第2光ファイバ
211 ・・・ 蓋部
212 ・・・ 応答部
301 ・・・ 光偏向素子(反射体)
301a・・・ 波長変換素子(蛍光体)
301a1・・ 第1波長変換素子
301a2・・ 第2波長変換素子
301b・・・ 光フィルタ(ファイバグレーティングフィルタ)
303 ・・・ 信号受信部
305 ・・・ 受信回路部
307 ・・・ 光波長合分波フィルタ
309a・・・ 応答部用光フィルタ
309b・・・ 信号受信部用光フィルタ
311 ・・・ 太陽電池
313 ・・・ 給電制御部
401 ・・・ 励起光
403 ・・・ 検出光
403a・・・ 検出光
405 ・・・ 信号光
Claims (16)
- 機器間で光伝送路を介して情報を光伝送するための光伝送システムであって、
光伝送路を介した機器間接続を検出するための励起光を光伝送路へ向けて出射する発信部と、
前記光伝送路から前記励起光を受光し当該励起光の光エネルギを利用して前記光伝送路へ向けて検出光を出射する応答部と、
前記光伝送路から前記検出光を受光して検出光電流を出力する応答受信部と、
前記検出光電流に基づいて前記機器間接続の有無を検出する検出部と、
前記検出部の検出結果に基づいて、情報の光伝送のための信号光を前記光伝送路へ向けて出射する光伝送用信号光送信部と、
前記光伝送路から前記信号光を受光する光伝送用信号光受信部と、を有する光伝送システム。 - さらに、前記機器の少なくとも一方に、前記光伝送路の接続を検出する光伝送路接続検出部を備え、
前記発振部は、前記光伝送路接続検出が前記光伝送路の接続を検出している場合に、前記励起光を出射する、請求項1に記載の光伝送システム。 - さらに、前記機器の少なくとも一方に、ユーザ操作を検出する操作検出部を備え、
前記発振部は、前記操作検出部が前記ユーザ操作を検出すると、前記励起光を出射する、請求項1または2に記載の光伝送システム。 - 前記応答部は、前記励起光の伝播方向を前記光伝送路の方向へ偏向させる光偏向素子である、請求項1に記載の光伝送システム。
- 前記光偏向素子は、反射体である、請求項4に記載の光伝送システム。
- 前記反射体は、鏡である、請求項5に記載の光伝送システム。
- 前記応答部は、前記励起光の少なくとも一部を吸収して、前記励起光のピーク波長と異なるピーク波長を有する前記検出光を出射する波長変換素子である、請求項1に記載の光伝送システム。
- 前記波長変換素子は、蛍光体である、請求項7に記載の光伝送システム。
- 前記応答部は、光フィルタである、請求項1に記載の光伝送システム。
- 前記光フィルタは、ファイバグレーティングフィルタである、請求項9に記載の光伝送システム。
- 前記検出部は、前記応答受信部が受光した前記検出光の波長に基づいて、前記光伝送路を介して接続された機器の種類を判別する、請求項1に記載の光伝送システム。
- さらに、前記励起光の少なくとも一部を吸収して起電力を発生させる太陽電池と、前記太陽電池の出力に基づいて、前記光伝送用信号光受信部への給電を制御する給電制御部と、を有する請求項1に記載の光伝送システム。
- さらに、前記光伝送用信号光受信部が受光した前記信号光に基づいて、前記光伝送用信号光受信部への給電を制御する給電制御部と、を有する請求項1に記載の光伝送システム。
- 前記発信部は、発光ダイオードである、請求項1に記載の光伝送システム。
- 前記光伝送用信号光送信部は、半導体レーザである、請求項1に記載の光伝送システム。
- 前記光伝送路は、その少なくとも一方の端部に蓋部を備え、
前記蓋部は、前記応答部を備え、
前記蓋部は、前記一方の端部が機器と接続されることにより閉鎖位置から開放位置へ移動し、
前記閉鎖位置においては、前記蓋部は、前記光伝送路を伝播してきた前記信号光を遮断する、請求項1に記載の光伝送システム。
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10326528B2 (en) | 2017-02-08 | 2019-06-18 | Fujitsu Limited | Optical transceiver and control method for optical transceiver |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5879546B2 (ja) * | 2011-01-07 | 2016-03-08 | パナソニックIpマネジメント株式会社 | 光伝送システム |
JP6222084B2 (ja) * | 2012-05-18 | 2017-11-01 | 日本電気株式会社 | 光システム |
US10693555B2 (en) * | 2014-09-03 | 2020-06-23 | British Telecommunications Public Limited Company | Optical network faulted identification |
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KR101817335B1 (ko) * | 2016-01-28 | 2018-01-10 | (주)파이버피아 | 광 단말기 모니터링 장치 및 방법 |
US20170302387A1 (en) * | 2016-04-15 | 2017-10-19 | Lattice Semiconductor Corporation | Interconnect for micro form-factor photonic |
US10797797B2 (en) * | 2017-03-31 | 2020-10-06 | Nexans | Fiber optic extender |
US11177877B2 (en) * | 2019-05-29 | 2021-11-16 | Hewlett Packard Enterprise Development Lp | Data transfer between electrical-optical devices |
US11092761B2 (en) * | 2019-12-04 | 2021-08-17 | Baker Hughes Oilfield Operations Llc | Downhole fiber optic connector with fiber channel independent testing apparatus |
CN114176797B (zh) * | 2021-11-17 | 2023-08-18 | 上海微创医疗机器人(集团)股份有限公司 | 手术器械安装检测系统、手术器械和手术机器人 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05273475A (ja) * | 1992-03-24 | 1993-10-22 | Sony Corp | 光ファイバ通信装置 |
JPH0628594A (ja) * | 1992-07-08 | 1994-02-04 | Fujitsu Ltd | 光パワーダウン装置 |
JPH0787025A (ja) * | 1993-09-17 | 1995-03-31 | Mitsubishi Electric Corp | 光伝送機器 |
JPH10163968A (ja) * | 1996-11-29 | 1998-06-19 | Tokin Corp | 光源作動制御装置およびこれを備えた光通信シテスム |
JPH11355208A (ja) * | 1998-06-09 | 1999-12-24 | Sony Corp | 光通信装置 |
JP2004350155A (ja) | 2003-05-23 | 2004-12-09 | Sony Corp | 光通信システム、光通信装置および光ケーブル |
JP2006050530A (ja) * | 2004-07-06 | 2006-02-16 | Fuji Xerox Co Ltd | 光信号伝送装置 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4289398A (en) * | 1978-12-04 | 1981-09-15 | Robichaud Roger E | Optical time domain reflectometer |
DE3721823A1 (de) * | 1987-07-02 | 1989-01-12 | Philips Patentverwaltung | Verfahren zur messung der von einer reflexionsstelle reflektierten optischen strahlungsleistung |
KR0123893B1 (ko) * | 1989-11-11 | 1997-12-01 | 마사씨 코지마 | 광전송로의 고장위치를 판별하는 방법 및 이 방법에 사용하는 광필터형 판별기 |
GB9027716D0 (en) * | 1990-12-20 | 1991-02-13 | British Telecomm | Optical communications system |
US5251001A (en) * | 1991-11-18 | 1993-10-05 | Teradyne, Inc. | Reflected optical power fiber test system |
JPH09261187A (ja) * | 1996-03-19 | 1997-10-03 | Fujitsu Ltd | 無中継光伝送システムのリモートアンプおよび障害点標定方法 |
JPH09307134A (ja) * | 1996-05-13 | 1997-11-28 | Fujitsu Ltd | 受光素子及びその光モジュール並びに光ユニット |
JP4902044B2 (ja) * | 1999-09-24 | 2012-03-21 | シャープ株式会社 | 半導体レーザ装置、光伝送装置、光伝送システム、電子機器、制御装置、接続コネクタ、通信装置、ならびに光伝送方法、データ送受信方法 |
AU2002318180A1 (en) * | 2001-07-09 | 2003-01-29 | Oyster Optics, Inc. | Fiber optic telecommunications card with security detection |
GB0126166D0 (en) * | 2001-10-31 | 2002-01-02 | Cit Alcatel | Apparatus and method for monitoring an optical transmission line |
JP2003218813A (ja) * | 2002-01-22 | 2003-07-31 | Sankosha Corp | 光信号監視装置 |
US7359634B1 (en) * | 2003-08-01 | 2008-04-15 | Cisco Technology, Inc. | Light color recognition for optical connection verification |
JP2007043521A (ja) * | 2005-08-04 | 2007-02-15 | Hitachi Communication Technologies Ltd | 光送受信機および波長多重通信システム |
US20070154215A1 (en) * | 2006-01-05 | 2007-07-05 | Tellabs Bedford, Inc. | Method and apparatus for detecting optical reflections in an optical network |
US8570501B2 (en) * | 2009-12-17 | 2013-10-29 | At&T Intellectual Property I, Lp. | Fiber identification using mode field diameter profile |
US8842995B2 (en) * | 2010-05-11 | 2014-09-23 | The Invention Science Fund I, Llc | Optical power transmission systems and methods |
CN101924962B (zh) * | 2010-08-25 | 2015-06-10 | 中兴通讯股份有限公司 | 光纤故障检测的系统及方法 |
JP5879546B2 (ja) * | 2011-01-07 | 2016-03-08 | パナソニックIpマネジメント株式会社 | 光伝送システム |
WO2013025630A1 (en) * | 2011-08-12 | 2013-02-21 | Oclaro Technology Limited | Embedded optical time domain reflectometer for optically amplified links |
-
2011
- 2011-10-28 JP JP2012551747A patent/JP5879546B2/ja not_active Expired - Fee Related
- 2011-10-28 US US13/583,102 patent/US9002198B2/en not_active Expired - Fee Related
- 2011-10-28 CN CN201180012719.1A patent/CN102783055B/zh not_active Expired - Fee Related
- 2011-10-28 WO PCT/JP2011/006055 patent/WO2012093431A1/ja active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05273475A (ja) * | 1992-03-24 | 1993-10-22 | Sony Corp | 光ファイバ通信装置 |
JPH0628594A (ja) * | 1992-07-08 | 1994-02-04 | Fujitsu Ltd | 光パワーダウン装置 |
JPH0787025A (ja) * | 1993-09-17 | 1995-03-31 | Mitsubishi Electric Corp | 光伝送機器 |
JPH10163968A (ja) * | 1996-11-29 | 1998-06-19 | Tokin Corp | 光源作動制御装置およびこれを備えた光通信シテスム |
JPH11355208A (ja) * | 1998-06-09 | 1999-12-24 | Sony Corp | 光通信装置 |
JP2004350155A (ja) | 2003-05-23 | 2004-12-09 | Sony Corp | 光通信システム、光通信装置および光ケーブル |
JP2006050530A (ja) * | 2004-07-06 | 2006-02-16 | Fuji Xerox Co Ltd | 光信号伝送装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10326528B2 (en) | 2017-02-08 | 2019-06-18 | Fujitsu Limited | Optical transceiver and control method for optical transceiver |
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