JP2001136124A - Optical termination processing circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical termination processing circuit that can easily conduct input limit and wavelength assignment and attain versatility an economy. SOLUTION: An optical signal generated by modulating a light source 3 with transmission data is given to a disk type filter unit 1 and a power sensor 7 via a photocoupler 5, the power sensor 7 detects power of an optical signal given to the disk type filter unit 1 to control a prospective angle of the disk type filter on the basis of the comparison with a reference value so as to control a transmitting wavelength of an optical signal sent to an optical fiber access line thereby preventing an excess optical signal and transmission of an illegal wavelength light to the optical fiber access line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical access line and a user network interface (UNI: User N).
The present invention relates to an optical termination processing circuit that can be applied to an optical network unit (ONU: Optical Network Unit) for optically connecting an Ethernet (Ethernet Interface).

[0002]

2. Description of the Related Art Conventionally, a connection between an optical access network or an optical access line and a user is performed before supplying an optical signal from the optical access line to a user network interface as represented by, for example, a π system.
Once the optical signal is converted to an electrical signal by an optical termination box, that is, an optical line terminator, on the network side, the direct optical signal is required to realize FTTH (Fiber To The Home) in the future. It is necessary to connect the optical access line and the user network interface.

For example, if the optical fiber access line 55 is a network having a bus type or ring type topology as shown in FIG. 8 (a), each node connects to a subscriber terminal 51 located in a user's home. In case,
The optical line terminal is not provided on the node side as in the present case, but is provided in the subscriber terminal 51 to constitute a part of the user network interface 53.

[0004] As shown in FIG. 8 (a), a user network interface 53 provided in the subscriber terminal 51 is connected to a data terminal device (DT) in the subscriber terminal 51.
E) It is connected to 59 and 60, and is also connected to the optical network unit (Optical SLT) 57 of the optical line terminal 56 via the optical fiber access line 55. The user network interface 53 is configured as shown in FIG.
As shown in (b), an electric signal processing unit 53a connected to the data terminal devices 59 and 60 in the subscriber terminal 51 and an optical line terminal (O) connected to the optical access line 55.
NU) is constituted by an optical signal processing unit 53b. Note that the optical termination processing circuit of the present invention is applied to the optical signal processing unit 53b constituting this optical line termination device.

As described above, in configuring the optical line terminal in the user network interface 53, in addition to the conventional optical signal-electric signal conversion function, a load on the optical access line and the optical line terminal is added. In order to alleviate this, it is necessary to have a function of avoiding excessive input to the optical access line and the optical line terminal and selecting an assigned wavelength.

Conventionally, the above-described input limiting function to the optical access line and the optical line terminal, that is, the over-input avoiding function, is performed by directly turning on / off the light source or using a mechanical shutter 91 as shown in FIG. The function of realizing and selecting the assigned wavelength is realized by using an optical filter.

[0007]

As described above, conventionally, when providing an optical line terminal in a user network interface, an input limiting function and a function of selecting an assigned wavelength, which are functions required for the optical line terminal, are conventionally provided. In order to achieve this, a mechanical shutter and an optical filter are used, so that the configuration of the optical line terminating device becomes large, and it is necessary to provide an optical signal for assigning a different wavelength to each user. Is a problem.

[0008] The present invention has been made in view of the above,
It is an object of the present invention to provide an optical termination processing circuit that can easily perform input limitation and wavelength assignment, and can achieve versatility and economy.

[0009]

According to one aspect of the present invention, there is provided an optical termination processing circuit for optically connecting an optical access line to a user network interface. The transmission wavelength of the optical signal input from the side is controlled by the expected angle, the disk optical filter for transmitting the controlled optical signal to the optical access line side, and the disk optical filter is input from the user network interface side. Input power detecting means for detecting the power of the optical signal to be transmitted, and controlling the expected angle of the disc type optical filter based on the power of the optical signal detected by the input power detecting means, and transmitting the optical signal to the optical access line side. The gist of the present invention is to have a transmission-side control unit for controlling a transmission wavelength of an optical signal.

According to the first aspect of the present invention, the power of the optical signal input to the optical disc filter from the user network interface side is detected, and the power of the optical disc filter is detected based on the detected power of the optical signal. Since the transmission angle of the optical signal transmitted to the optical access line side is controlled by controlling the expected angle, it is possible to reliably prevent transmission of an excessive optical signal and an illegal wavelength to the optical access line. .

The present invention described in claim 2 is the same as the claim 1.
In the invention described in the above, output power detection means provided on the optical access line side of the disk-type optical filter and detecting the power of an optical signal output from the disk-type optical filter, and output power detected by the output power detection means Output side control means for controlling a prospective angle of the disc type optical filter so as to control a transmission wavelength of the optical signal based on a power of an optical signal and a prospective angle controlled by the transmitting side control means. Make a summary.

According to the second aspect of the present invention, the power of the optical signal output from the disk-type optical filter is detected, and based on the detected power of the optical signal and the comparison with the expected angle, the disk-type optical filter is detected. Control the perspective of,
Accordingly, since the transmission wavelength of the optical signal is controlled, the output of the excess optical signal and the output of the illegal wavelength can be more reliably prevented.

Further, the present invention according to claim 3 provides the invention according to claim 1.
Or the reception power detection means for detecting the power of the optical signal from the optical access line input to the disk-type optical filter, and the power based on the optical signal detected by the reception power detection means. The gist of the invention is to have a receiving-side control unit that controls the transmission angle of the optical signal received from the optical access line side by controlling the expected angle of the disk-type optical filter.

According to the third aspect of the present invention, the power of the optical signal from the optical access line input to the disk type optical filter is detected, and the power of the disk type optical filter is determined based on the detected power of the optical signal. Since the transmission angle of the optical signal received from the optical access line side is controlled by controlling the expected angle, it is possible to reliably prevent an excess optical signal and reception from an optical access line having an illegal wavelength.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the disc-type optical filter has a variable region in which the power of the transmitted optical signal changes depending on a viewing angle and a viewing angle where the transmission of the optical signal is blocked. At least one of the transmission areas
The gist is to have at least one region.

According to the fourth aspect of the present invention, since the disk type optical filter has at least one of a blocking region and a variable transmission region, the expected angle of the disk type optical filter is controlled to the blocking region. In this case, the optical signal can be completely cut off, and when controlled in the variable transmission area, the power of the transmitted optical signal can be varied according to the viewing angle, ensuring the transmission of excess optical signals and illegal wavelengths to optical access lines. Can be prevented.

The present invention according to claim 5 provides the present invention according to claim 4.
In the invention described in the above, output power detection means provided on the optical access line side of the disk-type optical filter and detecting the power of an optical signal output from the disk-type optical filter, and output power detected by the output power detection means Output side control means for controlling a prospective angle of the disc type optical filter so as to control a transmission wavelength of the optical signal based on a power of an optical signal and a prospective angle controlled by the transmitting side control means. Make a summary.

According to the fifth aspect of the present invention, the power of the optical signal output from the optical disk filter is detected, and the optical power of the optical disk is compared with the detected optical signal power and the expected angle. Since the transmission angle of the optical signal is controlled by controlling the expected angle of the filter, the output of the excess optical signal and the output of the illegal wavelength can be more reliably prevented.

Further, the present invention according to claim 6 provides the invention according to claim 4.
Or the receiving power detecting means for detecting the power of the optical signal input from the optical access line to the disk type optical filter, and the power based on the optical signal detected by the receiving power detecting means. The gist of the invention is to have a receiving-side control unit that controls the transmission angle of the optical signal received from the optical access line side by controlling the expected angle of the disk-type optical filter.

According to the present invention, the power of the optical signal from the optical access line input to the optical filter is detected, and the power of the optical filter is determined based on the detected power of the optical signal. Since the transmission angle of the optical signal received from the optical access line side is controlled by controlling the expected angle, it is possible to reliably prevent an excess optical signal and reception from an optical access line having an illegal wavelength.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the disk type optical filter is configured such that a transmission wavelength of an optical signal changes in a radial direction. That is the gist.

According to the seventh aspect of the present invention, since the disc-type optical filter is configured such that the transmission wavelength of the optical signal changes in the radial direction, the optical signal in the radial direction of the disc-type optical filter is changed. The transmission wavelength of the optical signal can be controlled by the transmission position, so that transmission of an excessive optical signal and transmission of an illegal wavelength to the optical access line can be reliably prevented.

The present invention described in claim 8 provides the present invention according to claim 7.
In the invention described in the above, output power detection means provided on the optical access line side of the disk-type optical filter and detecting the power of an optical signal output from the disk-type optical filter, and output power detected by the output power detection means An output-side control means for controlling a prospective angle of a control disk type optical filter to control a transmission wavelength of the optical signal based on a power of the optical signal and a prospective angle controlled by the control means. I do.

According to the present invention, the power of the optical signal output from the disk-type optical filter is detected, and based on the detected power of the optical signal and comparison with the expected angle, the disk-type optical filter is used. Is controlled to control the transmission wavelength of the optical signal, so that the output of the excess optical signal and the output of the illegal wavelength can be more reliably prevented.

Further, the present invention described in claim 9 is the same as claim 7.
Or the reception power detection means for detecting the power of an optical signal from an optical access line input to the disk type optical filter, and the power based on the power of the optical signal detected by the reception power detection means. The gist of the invention is to have a receiving-side control unit that controls the transmission angle of the optical signal received from the optical access line side by controlling the expected angle of the disk-type optical filter.

According to the ninth aspect of the present invention, the power of the optical signal from the optical access line input to the disk type optical filter is detected, and the power of the disk type optical filter is determined based on the detected power of the optical signal. Since the transmission angle of the optical signal received from the optical access line side is controlled by controlling the expected angle, it is possible to reliably prevent an excess optical signal and reception from an optical access line having an illegal wavelength.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a diagram illustrating a configuration of an optical termination processing circuit according to the first embodiment of the present invention. The optical termination processing circuit shown in FIG. 1 uses the disk-type optical filter unit 1 to achieve an over-input avoiding function and a function of selecting an assigned wavelength. This disk type optical filter unit 1 has optical input / output ports 1a and 1b and an external control signal input / output port 1c, and the optical input / output port 1a is supplied from the electric signal processing unit 53a shown in FIG. An optical signal generated by modulating the light source 3 with the input data is input via an optical coupler 5 constituting an optical branching unit, and an optical signal passing through the disk type optical filter unit 1 is transmitted from an optical input / output port 1b. The data is output to an optical fiber access line.

The optical signal input from the light source 3 to the disk type optical filter unit 1 is partly branched by the optical coupler 5 and input to the power sensor 7. 1 is to detect the power of the optical signal input thereto. The power of the optical signal detected by the power sensor 7 is input as a control signal to the external control signal input / output port 1c of the disk-type optical filter unit 1, whereby the disk-type optical filter unit 1 is controlled based on the power of the optical signal. Is controlled. Further, an alarm signal and other control signals are input and output from the external control signal input / output port 1c of the disk type optical filter unit 1.

As shown in detail in FIG. 2A, the disk type optical filter unit 1 is configured using a disk type optical filter 13 instead of a conventional mechanical shutter 91. As shown in FIG. 2B, the disk type optical filter 13 has an encoder mark 13a formed in a peripheral portion in a circumferential direction, the surface of the disk type optical filter 13 is covered with a dielectric multilayer film, and the disk type optical filter 13 is transmitted. It is configured such that the transmission wavelength of the optical signal can be controlled by the estimated angle φ. That is, the disc-type optical filter 13 is variable in wavelength, and an accurate transmission wavelength can be controlled by an expected angle φ of a transmission position on the disc-type optical filter 13. Is configured to change as shown in FIG. 2C with respect to the estimated angle φ of the transmission position in the circumferential direction.

Therefore, by controlling the expected angle φ of the transmission position of the disk-type optical filter 13, the wavelength of the optical signal transmitted through the disk-type optical filter 13 can be controlled. It can be accurately determined by optically reading the encoder mark 13a formed on the disk-type optical filter 13 in the circumferential direction.

The disk type optical filter unit 1 is shown in FIG.
As shown in FIG. 1A, an optical collimator 15 for inputting an optical signal from an optical input / output port 1a to a disk type optical filter 13 is opposed to the optical collimator 15 with the disk type optical filter 13 interposed therebetween. It is arranged and connected to the optical input / output port 1b so as to receive the optical signal transmitted through the disk type optical filter 13 and to transmit the optical signal to the optical fiber access line 55 via the optical input / output port 1b. The optical collimator 17, a driving device 19 that rotationally drives the disk-type optical filter 13 to control the expected angle φ of the transmission position of the disk-type optical filter 13, and an encoder mark 13 a formed on the periphery of the disk-type optical filter 13. The photocoupler 21 to be read, the output signal from the photocoupler 21 is input, and the estimated angle φ is determined. Drive control signal to Gyosu 1
9 is further provided.

Next, the operation of the optical termination processing circuit of the present embodiment configured as described above will be described. FIG.
2A, an optical signal generated by modulating a light source 3 with data supplied from an electric signal processing unit of a user network interface is input to a disk-type optical filter unit 1 and a power sensor 7 via an optical coupler 5. Is done. As a result, the power sensor 7 detects the power of the optical signal input to the disk-type optical filter unit 1, and outputs a control signal including the detected power of the optical signal to the disk-type optical filter unit 1 via the external control signal input / output port 1c. Input to the optical filter unit 1.

In the disk type optical filter unit 1, as shown in FIG. 2A, a control signal from the power sensor 7 inputted from the optical input / output port 1a is inputted to the control circuit 23. The control circuit 23 compares the power of the optical signal included in the control signal with a predetermined reference value, and sends a control signal to the driving device 19 to control the expected angle φ of the disk-type optical filter 13 based on the comparison result. Supply. As a result, the prospective angle φ of the disc-type optical filter 13 is controlled to an appropriate prospective angle φ corresponding to the power of the optical signal, whereby the optical signal transmitted through the disc-type optical filter 13 is appropriately controlled in power and wavelength. Is transmitted to the optical fiber access line via the optical input / output port 1b. Specifically, when the power of the optical signal input to the disc-type optical filter 13 is larger than a predetermined reference value, the rotation of the disc-type optical filter 13 is controlled to the expected angle at which the optical signal is cut off. This prevents an excessive optical signal or an optical signal with an illegal wavelength from being output to the optical fiber access line.

FIG. 1B is a diagram showing a configuration of an optical termination processing circuit according to a second embodiment of the present invention. The optical termination processing circuit according to the second embodiment shown in FIG. 10 is different from the optical termination processing circuit according to the first embodiment shown in FIG.
The optical coupler 9 splits the optical signal output from the disc-type optical filter unit 1, the power of the split optical signal is detected by the power sensor 11, and a control signal including the power of the detected optical signal is provided. Is input to the disk-type optical filter unit 1, thereby controlling the disk-type optical filter unit 1 based on the power of the optical signal output from the disk-type optical filter unit 1, that is, the expected angle φ of the disk-type optical filter 13. The only difference is that control is performed, and the other configurations and operations are the same as those of the first embodiment shown in FIG.

As in the present embodiment, in addition to the control of the disc-type optical filter 13 by the input optical signal power to the disc-type optical filter unit 1, the disc-type optical filter unit 1 also uses the output optical signal power from the disc-type optical filter unit 1. By controlling the expected angle φ of the optical filter 13, the optical signal power and wavelength transmitted to the optical fiber access line are monitored based on a comparison between the expected angle of the disk-type optical filter 13 and the output optical signal power. Input of an optical signal and input of an illegal wavelength can be prevented.

FIG. 3A is a diagram showing a configuration of an optical termination processing circuit according to a third embodiment of the present invention. The optical termination processing circuit according to the third embodiment shown in FIG. 3 is different from the optical termination processing circuit according to the first embodiment shown in FIG. The difference is that the power is controlled, whereas the power of the optical signal received from the optical fiber access line is controlled.

That is, in the optical termination processing circuit of the third embodiment shown in FIG. 3A, the optical signal from the optical fiber access line is transmitted to the optical input / output of the disk type optical filter unit 31 through the optical coupler 33. While being inputted from the port 31a to the disc-type optical filter unit 31, the light is branched by the optical coupler 33 and inputted to the power sensor 35,
The power of the optical signal is detected by the power sensor 35,
The control signal is input to the disk-type optical filter unit 31 via the external control signal input / output port 31c, whereby the expected angle of the disk-type optical filter 13 is controlled. Further, the optical signal having the appropriate power and wavelength with the prospect angle controlled is input to the receiver 37 from the disk-type optical filter unit 31 and received, and is input to the electric signal processing unit as data. ing.

In the optical termination processing circuit configured as above, the power of the optical signal input from the optical fiber access line is detected by the power sensor 35, and the detected power is compared with a predetermined reference value. Then, when the optical signal power exceeds the reference value, the disc-type optical filter 13 is rotated to the expected angle at which the optical signal is interrupted,
This prevents excessive input of optical signals and input of illegal wavelengths to the user network interface.

FIG. 3B is a diagram showing a configuration of an optical termination processing circuit according to a fourth embodiment of the present invention. The optical termination processing circuit according to the fourth embodiment shown in the figure is different from the output side of the disk-type optical filter unit 31 in the third embodiment shown in FIG. An optical coupler 39 and a power sensor 41 are provided. The optical signal output from the disk-type optical filter unit 31 is branched by the optical coupler 39, and the power of the branched optical signal is detected by the power sensor 41. A control signal including the optical signal power is input to the disk-type optical filter unit 31, whereby the disk-type optical filter unit 31 is controlled based on the power of the optical signal output from the disk-type optical filter unit 31 to the user network interface side. That is, the difference is that the expected angle of the disk-type optical filter 13 is controlled. , And the other configurations and operations FIGS. 3 (a)
This is the same as the third embodiment shown in FIG.

As in the present embodiment, in addition to the control of the disk type optical filter 13 by the optical signal power input from the optical fiber access line to the disk type optical filter unit 1, the user network interface The optical angle of the disc type optical filter 13 is also controlled by the optical signal power output to the side, so that the optical angle is input to the optical user network interface based on the comparison between the optical angle of the optical filter 13 and the output optical signal power. The optical signal power and wavelength can be monitored to prevent excessive optical signal input and illegal wavelength input.

FIG. 4 is a diagram showing a configuration of an optical termination processing circuit according to a fifth embodiment of the present invention. The optical termination processing circuit of the fifth embodiment shown in FIG.
(B) and all the optical termination processing circuits of the first to fourth embodiments shown in FIGS. 3 (a) and 3 (b) are combined, and an optical fiber access line is transmitted from the user network interface via the disk type optical filter 13. , The optical signal received from the optical fiber access line to the user network interface, and all the power of the optical signal at the input / output side of the disk type optical filter 13, thereby detecting one disk type The configuration is such that the expected angle of the optical filter 13 is controlled. Note that the reference numerals in FIG. 4 correspond to FIGS.
3A and 3B are the same as those used in FIGS.

As in the present embodiment, the control of the expected angle of the disk-type optical filter 13 with respect to the transmission and reception of the optical signal involves the following:
An optical signal transmitted / received to / from the optical fiber access line is input to a different expected angle of the disk-type optical filter 13 (when the wavelength of the received light and the wavelength of the transmitted light are different), or By inputting them on different circles (when the wavelengths of the received light and the transmitted light are the same), a single optical disc filter 13 can constitute an optical line termination device for transmission and reception. With this configuration, transmission and reception of optical signals can be managed by one disk-type optical filter 13, so that a highly versatile user network interface that can be used for both transmission and reception can be realized.

FIG. 5A is a diagram showing a configuration of an optical termination processing circuit according to a sixth embodiment of the present invention. The optical termination processing circuit of the sixth embodiment shown in FIG. 5 is a disk type optical filter used in the disk type optical filter unit 1 in the first embodiment shown in FIG.
As shown in FIG. 5B, a partial area of the disk-type optical filter, specifically, in the example of FIG. 5B, the right half area of the disk-type optical filter is formed in the light blocking area 41b. The difference is that a filter 41 is used, and other configurations and operations are the same.

By using the disk-type optical filter 41 having the light blocking area 41b, the optical signal transmitted through the light blocking area 41b is completely blocked, so that an excessive input of the optical signal is ensured. Can be prevented. Note that the disk-type optical filter 41 shown in FIG.
In the figure, the right half is a light blocking area 41b, while the left half is a variable transmission area in which the power of an optical signal transmitted at an estimated angle φ is variable.

Light blocking area 4 of disc-type optical filter 41
1b, as shown in FIG. 5 (b), an aluminum vapor-deposited film is provided on the dielectric multilayer film on the surface in a half area of the disk type optical filter, and the transmission wavelength characteristic of the disk type optical filter 41 is formed. The transmission output characteristics are as shown in FIG. That is, as shown by the dotted line in FIG. 5 (c), the transmission output sharply changes when the expected angle φ is 180 degrees, and transmits an optical signal when the estimated angle φ is 180 degrees or less, and when the expected angle φ is 180 degrees or more, The optical signal is blocked. By using the disk-type optical filter 41 having such a light blocking region 41b, it is possible to appropriately prevent an excessive input of an optical signal and an input of an illegal wavelength.

FIG. 6A is a diagram showing a configuration of an optical termination processing circuit according to a seventh embodiment of the present invention. The optical termination processing circuit of the seventh embodiment shown in FIG. 6 is a disk-type optical filter used in the disk-type optical filter unit in the first embodiment shown in FIG.
The difference is that a disk-type optical filter 43 configured to change the transmitted light power in the radial direction of the transmitted light position of the disk-type optical filter is used as shown in FIG. Is the same.

In the disc type optical filter 43 of the seventh embodiment shown in FIG. 6B, a transmission position where an optical signal is transmitted is illustrated at a radius r. Are formed on the dielectric multilayer film on the surface so that the aluminum vapor-deposited film becomes thicker toward the center direction of the disk-type optical filter 43. FIG.
(C) and (d). That is, the transmission center wavelength of the optical signal with respect to the expected angle φ is the same as that of the first embodiment, but the transmission output power of the optical signal in the radial direction increases so as to be directly proportional to the radius r. .

In the seventh embodiment thus configured, the expected angle φ and the radial position r of the disk-type optical filter 43 are determined by the power sensor 7 and the control circuit 23 so that the optical signal is transmitted at a constant power. Controlled, thereby preventing excessive optical signal input and illegal wavelength input.

In each of the embodiments described above, the case where the optical termination processing circuit of the present invention is used as an optical user interface for general users is described. As shown in FIG. 7, at the transmitting / receiving end of the optical line composed of the optical fiber access line 61, the optical network can be used also as an optical user interface that opens the user network interface and beyond to users.

In FIG. 7, the optical fiber access line 61
Is connected to a plurality of transmitters 65 via a WDM multiplexer 63. One of the transmitters 73 is a λ interface which is a user network interface to which the optical termination processing circuit of the present invention is applied. 71, and the other end of the optical fiber access line 61 is connected to WD
A plurality of receivers 69 are connected via an M multiplexer 67, and a receiver 75 among them is connected via a λ interface 77 to which the optical termination processing circuit of the present invention is applied. Transmitters 73 and 75 after 77
Is open to the user as follows.

Since the disk type optical filter used in each of the above embodiments has a variable transmission wavelength of 80 nm or more, there is no need to provide a different disk type optical filter for each user, and it is economical. At the same time, versatility can be significantly improved.

[0052]

As described above, according to the present invention,
The power of the optical signal input to the disk-type optical filter from the user network interface side is detected, the expected angle of the disk-type optical filter is controlled based on the detected power of the optical signal, and transmitted to the optical access line side. Since the transmission wavelength of the optical signal is controlled, transmission of an excessive optical signal and an illegal wavelength to the optical access line can be reliably prevented, and transmission to the optical fiber access line and wavelength assignment can be easily performed. Further, since the disc-type optical filter may have a transmission wavelength of 80 nm or more, it is not necessary to provide a disc-type optical filter for each user, so that versatility and economic efficiency can be remarkably improved.

Further, according to the present invention, the power of the optical signal output from the disk-type optical filter is detected, and the estimated angle of the disk-type optical filter is determined based on the detected power of the optical signal and the comparison with the estimated angle. By controlling the transmission wavelength of the optical signal, the output of the excess optical signal and the output of the illegal wavelength can be more reliably prevented, and the transmission limitation and the wavelength allocation to the optical fiber access line can be more reliably ensured. It can be carried out.

Further, according to the present invention, the power of the optical signal from the optical access line input to the disk type optical filter is detected, and the expected angle of the disk type optical filter is controlled based on the detected power of the optical signal. Then, since the transmission wavelength of the optical signal received from the optical access line side is controlled,
Excessive optical signals and reception from an optical access line having an illegal wavelength can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an optical termination processing circuit according to first and second embodiments of the present invention.

FIG. 2 is a diagram showing a configuration of a disk-type optical filter unit used in the optical termination processing circuit shown in FIG. 1, a structure of a disk-type optical filter used in the disk-type optical filter unit, and wavelength transmission characteristics. is there.

FIG. 3 is a diagram illustrating a configuration of an optical termination processing circuit according to third and fourth embodiments of the present invention.

FIG. 4 is a diagram illustrating a configuration of an optical termination processing circuit according to a fifth embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration of an optical termination processing circuit according to a sixth embodiment of the present invention, a structure of a disk-type optical filter used in the optical termination processing circuit, and wavelength transmission characteristics.

FIG. 6 is a diagram showing a configuration of an optical termination processing circuit according to a seventh embodiment of the present invention, a structure of a disk-type optical filter used in the optical termination processing circuit, and a wavelength transmission characteristic and a transmission output power characteristic. is there.

FIG. 7 is a system configuration diagram showing application of the optical termination processing circuit of the present invention to a λ interface.

FIG. 8 is an explanatory diagram illustrating a field to which the optical termination processing circuit of the present invention is applied.

FIG. 9 is a diagram showing a configuration of an optical termination processing circuit which is a user network interface using a conventional mechanical shutter and an optical filter.

[Explanation of symbols]

 1,31 Disk-type optical filter unit 5,9,33,39 Optical coupler 7,11,35,41 Power sensor 13,41,43 Disk-type optical filter 15,17 Optical collimator 19 Driving device 21 Photocoupler 23 Control circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04J 14/00 14/02 (72) Inventor Shinro Fujii 2-3-1 Otemachi, Chiyoda-ku, Tokyo Date Within the Telegraph and Telephone Co., Ltd. (72) Inventor Shoga Katagiri 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term within the Telegraph and Telephone Co., Ltd. 2H041 AA02 AA21 AB07 AB10 AC01 AZ06 5K002 AA01 AA05 AA07 BA02 BA04 CA05 CA09 EA03 EA05 FA01

Claims (9)

[Claims] 1. An optical termination processing circuit for optically connecting an optical access line and a user network interface, wherein the transmission wavelength of an optical signal input from the user network interface side is controlled by an expected angle. A disk-type optical filter for transmitting the optical signal to the optical access line side, input power detection means for detecting the power of the optical signal input to the disk-type optical filter from the user network interface side, and the input power detection means Transmission side control means for controlling a transmission angle of an optical signal transmitted to an optical access line side by controlling an expected angle of the disc type optical filter based on the detected optical signal power. Optical termination processing circuit. 2. An output power detecting means provided on an optical access line side of the disk-type optical filter and detecting the power of an optical signal output from the disk-type optical filter; Output side control means for controlling a prospective angle of the disc type optical filter so as to control a transmission wavelength of the optical signal based on a power of an optical signal and a prospective angle controlled by the transmitting side control means. 2. The optical termination processing circuit according to claim 1, wherein: 3. A receiving power detecting means for detecting a power of an optical signal from an optical access line input to the disk type optical filter, and the disk type optical filter based on the power of the optical signal detected by the receiving power detecting means. 3. The optical termination processing circuit according to claim 1, further comprising: a receiving side control unit that controls a transmission angle of an optical signal received from the optical access line side by controlling an expected angle of the optical filter. 4. The disk-type optical filter has at least one of a blocking area for blocking transmission of an optical signal and a variable transmission area in which the power of an optical signal passing therethrough changes according to a viewing angle.
2. The optical termination processing circuit according to claim 1, comprising at least one region. 5. An output power detection means provided on the optical access line side of the disk-type optical filter and detecting the power of an optical signal output from the disk-type optical filter; Output side control means for controlling a prospective angle of the disc type optical filter so as to control a transmission wavelength of the optical signal based on a power of an optical signal and a prospective angle controlled by the transmitting side control means. The optical termination processing circuit according to claim 4, wherein: 6. A receiving power detecting means for detecting a power of an optical signal from an optical access line input to the optical filter, and a disk type optical signal based on the power of the optical signal detected by the receiving power detecting means. 6. The optical termination processing circuit according to claim 4, further comprising a receiving side control unit that controls a transmission angle of an optical signal received from the optical access line side by controlling a prospective angle of the optical filter. 7. The optical termination processing circuit according to claim 1, wherein the disk type optical filter is a disk type optical filter configured to change a transmission wavelength of an optical signal in a radial direction. 8. An output power detecting means provided on an optical access line side of the disk-type optical filter and detecting the power of an optical signal output from the disk-type optical filter; Output side control means for controlling the expected angle of the control disk type optical filter to control the transmission wavelength of the optical signal based on the power of the optical signal and the expected angle controlled by the control means. The optical termination processing circuit according to claim 7. 9. A receiving power detecting means for detecting a power of an optical signal from an optical access line inputted to the disk type optical filter, and the disk type optical filter based on the power of the optical signal detected by the receiving power detecting means. 9. The optical termination processing circuit according to claim 7, further comprising: a receiving side control unit that controls a transmission angle of an optical signal received from the optical access line side by controlling an expected angle of the optical filter.