JP2001177479A - Optical conversion connector and optical receiver provided with the optical conversion connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical conversion connector that is not affected by the specification of applied communication system, installed simply at a low cost and can furthermore promote buildup of a communication system utilizing an optical fiber cable and to provide an optical receiver provided with the optical conversion connector. SOLUTION: The optical conversion connector 10A roughly consists of at least a light emitting element PD that converts (photoelectric conversion) an optical signal into an electric signal in the inside of a single cylindrical case 11, an input side connector 12 connected to an optical fiber 41 at one end of the case 11, and an output side connector 13 connected to a signal processing circuit 31 that applies prescribed signal processing such as amplification processing to the electric signal converted from the optical signal by the light receiving element PD. The optical signal received via an input terminal In (input side connector 12) is converted into an electric signal, which is outputted from an output terminal Out (output side connector 13).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical conversion connector and an optical receiver provided with the optical conversion connector, and more particularly to an optical conversion connector for converting an optical signal transmitted through an optical fiber cable into an electric signal, and an optical connector. The present invention relates to an optical receiving device including an optical conversion connector that performs predetermined signal processing on an electric signal converted by a conversion connector.

[0002]

2. Description of the Related Art Hitherto, a communication system using a coaxial cable as a transmission cable has been applied to a co-listening system in a building such as an apartment building or an office building. Coaxial cables have the advantage of being able to build communication systems reliably and relatively inexpensively because of their high track record of use and the near completion of related technologies.
Due to the remarkable attenuation (transmission loss) of the transmitted electric signal,
When applied to long-distance signal transmission, it is necessary to provide a plurality of repeaters and the like to compensate for signal strength, and has disadvantages such as a small amount of information that can be transmitted (a narrow band). On the other hand, in recent years, with the progress of the information society, there has been an increasing demand for transmission of a large amount and various kinds of information, and the construction of a communication system using an optical fiber cable as a next-generation communication system has been promoted. The optical fiber cable has remarkable features which are small in transmission loss, high in bandwidth, lightweight, and non-inductive, etc., which are not found in coaxial cables.

[0003] A schematic configuration of a conventional in-building hearing system will be briefly described below with reference to the drawings.
As shown in FIG. 10, the in-building listening system 100 is installed on the roof of a building or the like.
ng Satellite: BS or Communication Sate
llite: CS), a master antenna 101 for receiving a broadcast signal, and an optical transmitter 11 for converting the broadcast signal (electric signal) into an optical signal and outputting the optical signal 112
1. A transmission-side facility 110 including a transmission-side optical termination box 113 which is a demarcation point (wiring portion) of an optical fiber cable 120 including an optical cord 112 and a plurality of optical fibers;
One fiber of the optical fiber cable 120 is installed on the basement of the same building or another building.
2, a receiving terminal box 131 connected to the optical receiver 2, an optical receiving device 133 for converting an optical signal transmitted via the optical cord 132 into an electric signal, and installed on each floor and in each room in the building.
A receiving facility 130 comprising a receiving terminal 135 through which the converted electric signal is distributed via a coaxial cable.
, And is configured.

As described above, when the distance from the transmitting side equipment to the receiving side equipment near the master antenna is relatively long, such as in a high-rise building, or when there are many types of electric signals to be transmitted (the frequency band is wide). By using an optical fiber cable, a large amount of information can be transmitted satisfactorily with a small signal loss. Here, the optical receiving device 133 applied to the above-described co-listening system in a building will be described. As shown in FIG. 11, a photodiode that converts an optical signal transmitted via an optical fiber cable into an electric signal is used. And the like, a preamplifier 133b for amplifying the converted electric signal, a gain adjusting circuit (gain control: GC) 133c for controlling the gain of the amplified electric signal to stabilize the signal level,
And a post-amplifier 133d for amplifying the stabilized electric signal to a predetermined signal level (specified value).

[0005]

However, in the above-mentioned communication system, particularly in the optical receiver, the optical-to-electric conversion function and the signal processing function as shown in FIG. However, since it was manufactured and provided as dedicated equipment corresponding to the specifications of the applicable communication system, the internal configuration and housing scale were uneven and varied, leading to an increase in product cost and a decrease in versatility. Therefore, there is a problem that the introduction of a communication system using an optical fiber cable is hindered. In view of the above problems, the present invention can be installed inexpensively and easily without being affected by the specifications of the applied communication system, and can further construct a communication system using an optical fiber cable. An object of the present invention is to provide an optical conversion connector and an optical receiving device including the optical conversion connector, which can facilitate the conversion.

[0006]

According to a first aspect of the present invention, there is provided an optical conversion connector in which at least an optical fiber cable for transmitting an optical signal is connected to a single casing having a predetermined shape. And a light receiving element for converting the optical signal input through the optical fiber cable into an electric signal, and an output connector for outputting the electric signal converted by the light receiving element. According to a second aspect of the present invention, in the optical conversion connector according to the first aspect, the housing is formed in a cylindrical shape, and the input-side connector is provided at one longitudinal end of the cylindrical shape. In addition, the output-side connector is provided at the other end.

According to a third aspect of the present invention, in the optical conversion connector according to the second aspect, the output side connector is provided at an end of a predetermined transmission line extending from the other end of the housing. It is characterized by being. An optical conversion connector according to a fourth aspect of the present invention is the optical conversion connector according to the first aspect, wherein the single housing amplifies the electric signal converted by the light receiving element to a predetermined signal level. It is characterized by having an amplifying means. An optical conversion connector according to a fifth aspect of the present invention is the optical conversion connector according to the fourth aspect, wherein the amplifying means is configured to be able to change and set an amplification factor. An optical conversion connector according to a sixth aspect of the present invention is the optical conversion connector according to the first aspect,
The single housing includes a detection unit that detects the optical signal input through the input-side connector, and a display unit that displays a detection result of the optical signal by the detection circuit. Features.

According to a seventh aspect of the present invention, in the optical conversion connector according to the first aspect, the input side connector is detachably connected to the optical fiber cable. And Claim 8
The optical conversion connector according to the invention described in claim 1, wherein in the optical conversion connector according to claim 1, the output side connector is a signal processing device that performs predetermined signal processing on the electrical signal converted by the light receiving element. It is characterized by being detachably connected. An optical conversion connector according to a ninth aspect of the present invention is the optical conversion connector according to the eighth aspect, wherein the signal processing device superimposes the electric signal on the light-receiving element via the output-side connector. It is characterized by having a power supply function of supplying power.

[0009] An optical receiving device provided with an optical conversion connector according to the invention of claim 10 includes at least
An optical conversion connector that includes a light receiving element and converts an optical signal transmitted via an optical fiber cable into an electric signal, and is detachably connected to the optical conversion connector, and a predetermined signal is applied to the electric signal converted by the light receiving element. A signal processing device having a power supply function of performing signal processing and supplying driving power to the light receiving element by being superimposed on the electric signal,
It is characterized by having.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is a schematic configuration diagram showing a first embodiment of an optical conversion connector according to the present invention, and FIG.
FIG. 3 is a schematic circuit diagram illustrating an example of an internal circuit applied to the optical conversion connector according to the present embodiment. FIG. 3 illustrates a connection between the optical conversion connector according to the present embodiment and a signal processing circuit (general-purpose BS / CS booster). It is an external view which shows a state.

As shown in FIGS. 1 (a) and 1 (b), an optical conversion connector 10A according to the present embodiment is roughly divided into a single housing 11 having a cylindrical shape, and at least an optical signal is transmitted to the inside. A light receiving element PD for converting into a signal (optical / electrical conversion) is provided, and an input connector 12 connected to an optical fiber (or optical cord) 21 at one end of a housing 11, and a light / electrical signal is output by the light receiving element PD. A signal processing circuit (signal processing device) 3 that performs predetermined signal processing such as amplification processing on the converted electric signal.
1 and an output side connector 13 connected to the
The optical signal input through the input terminal In (input side connector 12) is converted into an electric signal and output from the output terminal Out (output side connector 13).

The light receiving element PD is a kind of diode composed of a semiconductor element. By applying a voltage in the reverse direction to the diode junction, an electric signal having an amplitude proportional to the intensity of the incident optical signal is generated. Output. Generally, a pin photodiode or an avalanche photodiode is applied to the light receiving element PD. Input connector 12
Has a shape detachably connected to a standardized connector (for example, FC type, SC type) 42 attached to the tip of the optical fiber 41.

As the output side connector 13, a female side (inner screw side) connector (for example, F type, FT type) standardized for a coaxial cable is applied. It has a shape that is detachably connected to the side (outer peripheral screw side) connector 32. As described later, for example, a general-purpose BS / CS booster or the like that amplifies and processes an electric signal transmitted through a coaxial cable directly connected to the male connector 32 is applied to the signal processing circuit 31. . Here, a general-purpose BS / CS booster has a function of supplying power for an antenna converter via an antenna wire (coaxial cable),
Driving power is supplied to the light receiving element PD.

Next, an internal circuit of the optical conversion connector according to this embodiment will be described. As shown in FIG. 2, the light conversion connector 10A includes a resistor R1 and capacitors C1 and C1.
2, a photodiode PD, and an inductance L1,
L2 and a predetermined driving power (voltage) from an output terminal Out connected to a signal processing circuit (not shown) through a connector.
Is supplied, and a reverse bias is applied to the light receiving element PD. In such a circuit configuration, when an optical signal enters the light receiving element PD via an optical fiber cable, it is converted into an electric signal having an amplitude proportional to the intensity of the optical signal and output from the output terminal Out.

In other words, the optical conversion connector 10A according to the present embodiment accommodates only the light-to-electric conversion function of the conventional light receiving device (see FIG. 11) in a single independent housing, and converts the light to electric converter. (O / E). As shown in FIG. 3, this optical conversion connector 10A is connected to a male connector 32 of a signal processing circuit 31 such as a general-purpose BS / CS booster. By doing so, the broadcast signal converted into the electric signal is amplified to realize a function equivalent to that of the conventional optical receiver. Here, reference numeral 33 denotes a male connector for outputting a broadcast signal that has been subjected to predetermined signal processing such as amplification processing by the signal processing circuit 31, and reference numeral 34 denotes a receiving connector for receiving the broadcast signal output from the signal processing circuit 31. This is a coaxial cable for distribution to terminals. Although FIG. 3 shows a state where the optical conversion connector 10A is directly connected to the male connector 32 of the signal processing circuit 31, a coaxial cable is provided between the optical conversion connector 10A and the signal processing circuit 31. The connection may be made indirectly.

In such a configuration, as described above, the signal processing circuit 31 converts the signal from the optical conversion connector 10A to the signal processing circuit 31 and superimposes it on the output electric signal.
Through the output side connector 13 (output terminal Out: the male side connector 32 of the signal processing circuit 31),
0A is supplied with drive power, so that the optical conversion connector 10
A can realize a light-to-electric conversion function without a power supply. Therefore, the circuit configuration can be simplified, and the size of the housing can be significantly reduced in size and weight. Also, the light receiving element PD applied to the optical conversion connector 10A according to the present embodiment is configured so that light-to-electric conversion can be performed in a wide band (for example, several MHz to several GHz) of an incident optical signal. By setting, regardless of the frequency characteristics of the signal processing circuit 31 connected to the output side connector, various types of BS / CS boosters and input terminals (ie, terminals to which the optical conversion connector 10A is connected) The present invention can be applied to other boosters or the like that can supply DC (direct current) power as driving power, and can realize a highly versatile optical receiving device.

Further, as shown in the prior art, a communication system using a coaxial cable is technically established and widely used, so that general-purpose equipment corresponding to various specifications can be manufactured at low cost. It can be easily obtained.
Therefore, by connecting the optical conversion connector 10A according to the present embodiment directly or via a coaxial cable to a general-purpose booster which is easily available and applied to such a communication system, a dedicated optical receiving device is provided. Therefore, an optical receiving device that meets predetermined specifications can be realized easily and inexpensively without providing a communication system, and the construction of a communication system using an optical fiber cable can be further promoted. It is desirable that the drive power supplied from the signal processing circuit 31 such as a general-purpose booster to the optical conversion connector 10A is a “pure” power supply without fluctuation or distortion. light·
This is because noise or the like is mixed in the electric signal during the electric conversion, which suppresses the influence on the subsequent signal processing.

<Second Embodiment> Next, a second embodiment of the optical conversion connector according to the present invention will be described with reference to the drawings. FIG. 4 is a schematic configuration diagram illustrating a light conversion connector according to a second embodiment. FIG. 5 is a schematic circuit diagram illustrating an example of an internal circuit applied to the light conversion connector according to the present embodiment. 6 is a schematic configuration diagram showing a connection state between the optical conversion connector according to the present embodiment and a signal processing circuit (general-purpose BS / CS booster). Here, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. The description will be given with reference to the schematic configuration diagram shown in FIG. 1 as necessary. As shown in FIG. 4, the light conversion connector 10B according to the present embodiment has a single housing 11
, A light receiving element PD for converting an optical signal into an electric signal (optical / electrical conversion), and a preamplifier (amplifying means) 21 for amplifying the converted electric signal in the first stage, and having an input terminal In (input). The optical signal input through the connector is converted to an electric signal of a predetermined signal level, and the output terminal Out is output.
(Output side connector).

Light conversion connector 1 having such a configuration
As shown in FIG. 5, the internal circuit 0B includes a resistor R1, capacitors C1 to C3, a photodiode PD, inductances L1 to L3, and a preamplifier 21, and is connected to a signal processing circuit (not shown) by a connector. Output terminal
From Out, a predetermined drive power (voltage) is supplied, and a reverse bias is applied to the light receiving element PD. Then, when the optical signal enters the light receiving element PD via the optical fiber cable, it is converted into an electric signal having an amplitude proportional to the intensity of the optical signal, and is first-stage amplified to a predetermined signal level by the preamplifier 21 and output. Output from terminal Out.

That is, the optical conversion connector 10B according to the present embodiment accommodates the optical-to-electric conversion function and the first-stage amplification function of the conventional optical receiver (see FIG. 11) in a single independent housing. -It is characterized by being configured as an electric converter (O / E), and as shown in FIG. 6, this optical conversion connector 10A is connected to a signal processing circuit 31 such as a general-purpose BS / CS booster. As a result, the signal processing circuit 31 controls the gain of the previously amplified electric signal by the gain adjustment circuit 31a to stabilize the signal level, and the post-amplifier 31b sets the signal level to a predetermined signal level (specified value). Amplify. Thereby, a signal (RF output) processed by the optical receiver configured by connecting the optical conversion connector 10B and the signal processing circuit 31 to each other.
Can be improved, and the circuit configuration on the signal processing circuit 31 side can be further simplified to reduce the product cost.

<Third Embodiment> Next, a third embodiment of the optical conversion connector according to the present invention will be described with reference to the drawings. FIG. 7 is a schematic configuration diagram illustrating a light conversion connector according to the third embodiment. Here, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIGS. 7A and 7B, the optical conversion connector 10 </ b> C according to the present embodiment has a single housing 1.
Converts optical signals into electrical signals inside 1 (optical / electrical conversion)
Light receiving element PD, a preamplifier (amplifying means) 21 for amplifying the converted electric signal in the first stage, a splitter 22 for splitting the converted electric signal, and presence or absence of an optical signal based on the split electric signal. Detection circuit (detection means)
23, and a display lamp (display means) 24 provided on a side surface of the housing 11 for visually recognizing the detection result of the optical signal. The input lamp 23 is provided with an input terminal In (input side connector). The converted optical signal is converted into an electric signal of a predetermined signal level, output from an output terminal Out (output side connector), and visually notifies the input state of the optical signal.

Optical conversion connector 1 having such a configuration
At 0C, as in the above-described embodiments, the output terminal Out connected to the signal processing circuit (not shown) is connected.
When a predetermined driving power (voltage) is supplied to the light receiving element PD, a reverse bias is applied to the light receiving element PD, and when the optical signal enters the light receiving element PD via the optical fiber cable, the signal has an amplitude proportional to the intensity of the optical signal. After being converted into an electric signal, the signal is first-stage amplified to a predetermined signal level by the preamplifier 21.
The first-stage amplified electric signal is output from an output terminal Out and is branched by a branching unit 22 to a detection circuit 23.
To extract an RF signal (high-frequency signal), the presence / absence of an optical signal incident on the light receiving element PD is detected, and the presence / absence of an appropriate RF level is detected. When an optical signal is incident on the light receiving element PD,
For example, the display lamp 24 is turned on, or is turned on in a different color (for example, green) from the case where light is not incident.

In other words, the state in which the optical signal is input via the optical fiber cable can be visually notified by the display lamp, whereby the transmission state of the optical signal and the optical / electrical conversion state in the optical conversion connector can be obtained. Can be easily recognized by an observer such as a maintenance staff. In FIG. 7, the branching device 22 is connected to the preamplifier 2
Although it is provided after the light receiving element PD, it may be provided after the light receiving element PD to determine the transmission state of the optical signal, the optical / electrical conversion state, and the like based on the output level of the light receiving element PD.

<Fourth Embodiment> Next, a fourth embodiment of the optical conversion connector according to the present invention will be described with reference to the drawings. FIG. 8 is a schematic configuration diagram illustrating a light conversion connector according to the fourth embodiment. Here, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 8, a light conversion connector 10D according to this embodiment includes a light receiving element PD, a preamplifier (amplifying means) 21, and an optical signal incident on the light receiving element PD inside a single housing 11. An amplifier 25 that amplifies a signal component corresponding to the intensity of the signal, and based on the amplified signal component,
A comparison circuit 26 for judging the light receiving level and a display lamp (display means) 27 for visually recognizing the judgment result are provided, and the optical signal input through the input terminal In (input side connector) is The signal is converted into an electric signal of a predetermined signal level, output from an output terminal Out (output side connector), and visually notifies the input state (transmission state) of the optical signal. Here, the amplifier 25 and the comparison circuit 26 constitute detection means in the present invention.

Optical conversion connector 1 having such a configuration
In 0D, as in the above-described embodiments, when an optical signal enters the light receiving element PD via an optical fiber cable, the optical signal is converted into an electric signal having an amplitude proportional to the intensity of the optical signal. At the first stage and output from the output terminal Out, the light receiving level of the light receiving element PD is extracted, and a DC portion (DC component) having an amplitude proportional to the intensity of the optical signal is extracted. The signal is quantitatively amplified and input to the comparison circuit 26.
The comparing circuit 26 determines whether or not a predetermined light receiving level is obtained by the light receiving element PD, and displays the result of the determination on the display lamp 27. Thus, the transmission state of the optical signal can be detected, so that an observer such as a maintenance person can easily recognize whether or not an appropriate optical signal is being received.

In the second to fourth embodiments, the preamplifier 21 may be provided with a variable resistor so that the amplification factor (gain) of the preamplifier 21 can be changed and set. By providing the gain adjustment unit in this manner, when the level of the optical signal input to the optical conversion connector is lower than a specified value or when the level is higher, the electric power output from the optical conversion connector by the gain adjustment unit The level of the signal can be adjusted to a specified value, and the signal of the specified level can be supplied to a subsequent signal processing circuit. Further, in the configuration shown in each of the above-described embodiments, the case where the housing of the optical conversion connector has a cylindrical shape has been described. However, the present invention is not limited to this. Needless to say, it may have another shape. In short, what is necessary is just to be able to maintain the connection state with the above-mentioned signal processing circuit well, for example, according to the structure in which the input / output side connectors are provided at both ends of the cylindrical housing shown in the above embodiment, The extension direction is aligned with the optical fiber, the coaxial cable, and the like, so that the connection path can be simplified, and the workability at the time of attachment, detachment, and replacement can be improved.

Further, in each of the above embodiments,
Although the configuration in which the input connector 12 and the output connector 13 are provided integrally with the housing 11 has been described, the present invention is not limited to this. For example, FIG.
As shown in (1), a coaxial cable (that is, a flexible transmission line) 14 may extend from the housing 11 to the output side, and an output-side connector 13 may be provided at the end of the coaxial cable 14. Optical conversion connector 1 having such a configuration
According to 0E, the connection direction of the output side connector 13 can be arbitrarily changed regardless of the installation direction (mounting direction) of the housing 11 while having the single housing 11.
As shown in FIG. 9B, the degree of freedom in connection with the signal processing circuit 31 is improved, and the connector connection operation can be easily performed.

[0028]

According to the first aspect of the present invention, an input connector to which an optical fiber cable for transmitting an optical signal is connected, a light receiving element for converting an optical signal into an electric signal, and a single housing. An output-side connector that outputs the converted electrical signal, so that an optical conversion connector having only an optical-to-electrical conversion function can be realized with a simple circuit configuration in a reduced size and weight, and a general-purpose booster, etc. Can be easily connected to the signal processing device. According to the second aspect of the present invention, the housing of the optical conversion connector is formed in a tubular shape, and the input connector and the output connector are provided at both ends in the longitudinal direction of the tubular shape. The extension direction is aligned with the optical fiber, coaxial cable, other wiring, etc. connected to the connector, so that the connection path can be simplified, and the workability at the time of attachment, detachment, and replacement can be improved. .

According to the third aspect of the present invention, since the output side connector is provided at the end of the predetermined transmission line extending from the other end of the housing, the installation of the housing constituting the optical conversion connector is provided. Regardless of the direction, the direction of the output side connector can be arbitrarily changed, the degree of freedom of connection of the optical conversion connector is increased, and the connection operation with the subsequent signal processing circuit or the like can be easily performed. According to the fourth aspect of the present invention, the single housing of the optical conversion connector includes, in addition to the light receiving element, an amplifying means for amplifying the converted electric signal to a predetermined signal level. It is possible to improve the C / N ratio of the signal (RF output) processed by the signal processing device to be processed, and to simplify the configuration of the subsequent-stage amplifier circuit to reduce the product cost.

According to the fifth aspect of the present invention, since the amplifying means is configured to be able to change and set the amplification factor, it is possible to supply a prescribed electric signal to the signal processing device and to reduce the signal level. The adjustment can be easily performed, and the reliability of the system can be secured. According to the sixth aspect of the present invention, the single unit of the optical conversion connector includes the detecting unit for detecting the input optical signal, and the display unit for displaying the detection result of the optical signal by the detecting circuit. Therefore, the transmission state of the optical signal, the optical / electrical conversion state of the optical conversion connector, and the like can be easily visually recognized. Claim 7
According to the described invention, the input-side connector has a structure corresponding to a standardized connector attached to the end of the optical fiber, and is detachably connected, so that the optical conversion connector can be easily connected to the optical fiber. Can be connected and disconnected, and workability during construction and maintenance of the communication system can be improved.

According to the eighth aspect of the invention, the output side connector has a structure corresponding to a standardized connector attached to a subsequent signal processing device or a coaxial cable, and is detachably connected. Therefore, the optical conversion connector can be easily connected to and disconnected from the signal processing device and the coaxial cable, and the workability during construction and maintenance of the communication system can be improved. According to the ninth aspect of the present invention, the signal processing device has a power supply function of supplying driving power to the light receiving element by superimposing on the electric signal via the output side connector. The optical-to-electric conversion function can be realized without providing a power supply. Therefore, the circuit configuration can be simplified, and the size of the housing can be significantly reduced in size and weight. In addition, since a general-purpose signal processing device for a coaxial cable having a power supply function can be directly connected to the optical conversion connector, it is possible to configure an optical receiving device that supports various specifications.

According to the tenth aspect of the present invention, an optical conversion connector that includes at least a light receiving element in a single housing and converts an optical signal transmitted through an optical fiber cable into an electric signal; A signal processing device that is detachably connected to the connector, performs predetermined signal processing on the converted electric signal, and has a power supply function of supplying driving power to the light receiving element by being superimposed on the electric signal. Therefore, a general-purpose device for a coaxial cable which is widely used as a signal processing device and conforms to various specifications can be used, and a communication system can be constructed at low cost and easily.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of an optical conversion connector according to the present invention.

FIG. 2 is a schematic circuit diagram showing an example of an internal circuit applied to the optical conversion connector according to the first embodiment.

FIG. 3 is an external view showing a connection state between the optical conversion connector according to the first embodiment and a general-purpose signal processing circuit.

FIG. 4 is a schematic configuration diagram showing a second embodiment of the optical conversion connector according to the present invention.

FIG. 5 is a schematic circuit diagram showing an example of an internal circuit applied to a light conversion connector according to a second embodiment.

FIG. 6 is a schematic configuration diagram illustrating a connection state between a light conversion connector and a signal processing circuit according to a second embodiment.

FIG. 7 is a schematic configuration diagram showing a third embodiment of the optical conversion connector according to the present invention.

FIG. 8 is a schematic configuration diagram showing a fourth embodiment of the optical conversion connector according to the present invention.

FIG. 9 is a schematic configuration diagram showing another configuration example of the optical conversion connector according to the present invention.

FIG. 10 is a schematic configuration diagram illustrating a conventional in-building hearing system.

FIG. 11 is a schematic circuit diagram showing an example of an internal circuit of a conventional optical receiver.

[Explanation of symbols]

 10A to 10E Optical conversion connector 11 Housing 12 Input connector 13 Output connector 21 Preamplifier 22 Splitter 23 Detection circuit 24, 27 Indicator lamp 25 Amplifier 26 Comparison circuit 31 Signal processing circuit 31a Gain adjustment circuit 31b Post amplifier 41 Optical fiber PD Light receiving element

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01L 31/0232 H04B 9/00 Y 31/10 H01R 31/06 H04B 10/28 10/26 10/04 10 / 06 F term (reference) 2H037 AA01 BA11 DA32 DA35 5F049 MA01 NA18 NA19 NB01 TA14 UA13 WA01 5F088 AA01 BA15 BB01 JA14 KA02 LA01 5K002 AA03 AA07 BA31 EA04 FA01

Claims (10)

[Claims] An input connector for connecting at least an optical fiber cable for transmitting an optical signal to a single casing having a predetermined shape; and an electrical signal for inputting the optical signal via the optical fiber cable. An optical conversion connector comprising: a light receiving element that converts the light into a light; and an output connector that outputs an electric signal converted by the light receiving element. 2. The device according to claim 1, wherein the housing is formed in a tubular shape, and the input connector is provided at one end in a longitudinal direction of the tubular shape, and the output connector is provided at the other end. The optical conversion connector according to claim 1, wherein 3. The optical conversion connector according to claim 2, wherein the output side connector is provided at an end of a predetermined transmission line extending from the other end of the housing. 4. The optical conversion connector according to claim 1, wherein the single housing is provided with amplifying means for amplifying the electric signal converted by the light receiving element to a predetermined signal level. . 5. The optical conversion connector according to claim 4, wherein said amplification means is configured to be able to change and set an amplification factor. 6. A detecting means for detecting the optical signal input to the single housing via the input connector, a display means for displaying a detection result of the optical signal by the detecting circuit, The optical conversion connector according to claim 1, further comprising: 7. The optical conversion connector according to claim 1, wherein the input side connector is detachably connected to the optical fiber cable. 8. The signal processing apparatus according to claim 1, wherein the output side connector is detachably connected to a signal processing device for performing predetermined signal processing on the electric signal converted by the light receiving element. Optical conversion connector as described. 9. The apparatus according to claim 1, wherein the signal processing device has a power supply function of supplying driving power to the light receiving element by superimposing on the electric signal via the output side connector. 8. The optical conversion connector according to 8. 10. An optical conversion connector that includes at least a light receiving element in a single housing and converts an optical signal transmitted through an optical fiber cable into an electric signal, and is detachably connected to the optical conversion connector. A signal processing device having a power supply function of performing predetermined signal processing on the electric signal converted by the light receiving element and superimposing the electric signal on the electric signal to supply driving power to the light receiving element. An optical receiving device comprising an optical conversion connector.