JP2011004033A - Optical access system, and optical repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously achieve the confidentiality of a down signal in a TDM-PON system and the extension and multi-branching of an optical access system.SOLUTION: An optical signal from an upstream optical transmission/reception device (1000) and an optical signal from a downstream optical transmission/reception device (1001) are converted to electric signal by two optical receivers (1301-01 and 1301-02), and then a determination control circuit (1301-03) identifies user IDs or service IDs from respective electric signals and controls a semiconductor optical amplifier (1301-06) so that only optical signals of which the user ID or the service ID coincides with that of the optical signal transmitted from the downstream optical transmission/reception device (1001), out of optical signals transmitted from the upstream optical transmission/reception device (1000) are reproduced.

Description

  The present invention relates to an optical access system and an optical repeater for selecting and reproducing an optical signal.

In an optical access system of the TDM (Time Division Multiplexing) -PON (Passive Optical Network) system, everything from the in-station device OLT (Optical Line Terminal) to the in-home device ONU (Optical Network Unit), including optical signals addressed to other ONUs Since this optical signal is transmitted, there is a difficulty in confidentiality. In addition, when a video signal is transmitted from the OLT to the ONU, each ONU is transmitted not only a signal of a video program with a subscription contract but also a signal of a video program without a subscription contract. There is a risk of being watched.
On the other hand, in recent years, in the optical access system, in order to realize a more economical system, studies on lengthening and multi-branching techniques have been actively conducted.
As a technique of secrecy in the former TDM-PON optical access system, there is a method of applying an encryption method (see Non-Patent Document 1). The latter technique of extending the length and branching includes a method using an optical amplifier (see Non-Patent Document 2).

Junki Miki, Kiyomi Kumozaki, Hiromi Ueda, Takashi Watanabe, “Security Method in Passive Double Star Optical Access System”, IEICE Transactions, March 2002, Vol. J85-B, no. 3, pp. 339-345 Ken-Ichi Suzuki, Youichi Fukada, Takashi Nakanishi, Naoto Yoshimoto, Makoto Tsubokawa, “Burst-mode Optical Amplifier for Long-reach 10Gbit / s PON application,” Optical Fiber Communication Conference and Exposition (OFC), OThL3, San Diego, USA , Feb.2008.

  Although these technologies can solve the problem of confidentiality of downlink signals, lengthening of optical access systems, and multi-branching problems, they are separate technologies, respectively, and the confidentiality of downstream signals and lengthening of optical access systems However, since it is impossible to realize multi-branching at the same time, it becomes a barrier to realizing further economic improvement of the optical access system.

  The present invention has been made in view of such problems, and an object of the present invention is to realize secrecy of downstream signals in the TDM-PON system, lengthening of the optical access system, and multi-branching. It is an object of the present invention to provide an optical access system and an optical repeater that simultaneously realize an optical signal regeneration function required for the above.

  In order to achieve the above object, the optical access system of the present invention has an optical repeater installed between optical transceivers that exchange optical signals in both directions, and is transmitted from one optical transceiver by the optical repeater. The user ID or service ID information included in the optical signal and the user ID or service ID information included in the optical signal transmitted from the other optical transmitter / receiver are determined, and the same user ID or service ID information Only the optical signal is reproduced.

  That is, the present invention provides an optical access system in which one optical transceiver and a plurality of optical transceivers perform one-to-many optical communication via an optical splitter, and the optical splitter between the optical splitter and the plurality of optical transceivers. An optical repeater is connected to each of the optical repeaters, and the optical repeater reproduces an optical signal from the upstream optical transceiver, and a first optical receiver receives the optical signal from the upstream optical transceiver. A user ID or a service ID is identified from each of the second optical receiver that receives the optical signal from the downstream optical transceiver and the electrical signals output from the first and second optical receivers; Only the optical signal whose user ID or service ID matches the user ID or service ID of the optical signal transmitted from the downstream optical transceiver is reproduced. Characterized in that it comprises a said optical reproduction unit light determination unit consisting judgment control circuit that controls so.

  According to another aspect of the present invention, there is provided an optical access system in which one optical transmitter / receiver and a plurality of optical transmitter / receivers perform one-to-many optical communication via an optical splitter. An optical repeater is connected to each of the optical repeaters. The optical repeater is connected to an optical delay line, an optical regenerator connected to the optical delay line and configured to regenerate an optical signal from an upstream optical transceiver, and an upstream A first optical receiver that receives an optical signal from the optical transceiver, a second optical receiver that receives an optical signal from a downstream optical transceiver, and outputs from the first and second optical receivers The optical signal from the upstream optical transceiver is input to the port 1 and the optical signal from the upstream optical transceiver is input to the optical determination unit. The first cycle that is emitted from port 2 And an optical signal from the port 2 of the first circulator, and a first optical splitter for branching the optical signal to the first optical receiver of the optical determination unit and the input end of the optical regeneration unit A second optical splitter for branching the optical signal from the downstream optical transceiver, and an optical signal branched by the second optical splitter is incident on the port 1, and the optical signal is transmitted to the port via the port 2. A second circulator that emits light to a second optical receiver of the light determination unit, and the first circulator receives the optical signal branched by the second optical splitter and enters the port 3, and the optical signal is The second circulator emits the optical signal from the output end of the optical regeneration unit, enters the port 3, and emits the optical signal to the second splitter through the port 1, Judgment by the light judgment unit The control circuit identifies a user ID or service ID from each of the electrical signals output from the first and second optical receivers, and among the optical signals transmitted from the upstream optical transceiver, the user ID or service The optical reproduction unit is controlled to reproduce only an optical signal whose ID matches a user ID or service ID of an optical signal transmitted from a downstream optical transceiver.

  The optical repeater in the optical access system of the present invention further includes an optical data unit for adding data to a vacant part of the optical signal output from the optical regenerator, and the determination control circuit of the optical determination unit includes an upstream When the user ID or service ID of the optical signal transmitted from the optical transmission / reception device does not match the user ID or service ID of the optical signal transmitted from the downstream optical transmission / reception device, the optical signal is vacant due to the mismatched optical signal. It is preferable to control the optical data unit so as to add data to a vacant part of the optical signal from the optical regeneration unit using the transmission band.

  The optical repeater in the optical access system of the present invention has a memory for holding information on a user ID or service ID of an optical signal transmitted from a downstream optical transceiver in the determination control circuit of the optical determination unit, The determination control circuit of the optical determination unit reproduces only the optical signal whose user ID or service ID matches the user ID or service ID held in the memory among the optical signals transmitted from the upstream optical transceiver. Thus, it is preferable to control the optical regeneration unit.

  Further, the present invention is an optical repeater installed on the downstream side of the optical splitter of an optical access system in which one optical transceiver and a plurality of optical transceivers perform one-to-many optical communication via an optical splitter. An optical regenerator that reproduces an optical signal from the upstream optical transceiver, a first optical receiver that receives the optical signal from the upstream optical transceiver, and an optical signal from the downstream optical transceiver A user ID or service ID is identified from each of the second optical receiver and the electrical signals output from the first and second optical receivers, and the optical signal transmitted from the upstream optical transceiver A light comprising a determination control circuit for controlling the optical regenerator so as to reproduce only the optical signal whose user ID or service ID matches the user ID or service ID of the optical signal transmitted from the downstream optical transceiver Characterized in that it comprises a tough.

  Further, the present invention is an optical repeater installed on the downstream side of the optical splitter of an optical access system in which one optical transceiver and a plurality of optical transceivers perform one-to-many optical communication via an optical splitter. And an optical regeneration unit comprising an optical delay line, an optical amplifier connected to the optical delay line and regenerating an optical signal from the upstream optical transceiver, and a first optical signal received from the upstream optical transceiver. Optical receivers, second optical receivers that receive optical signals from downstream optical transceivers, and electrical signals output from the first and second optical receivers. An optical determination unit comprising a determination control circuit for controlling the optical regenerator, a first circulator for allowing an optical signal from an upstream optical transmission / reception device to enter the port 1 and to emit the optical signal from the port 2; Port 1 of the first circulator Optical signals from the first optical receiver for branching the optical signals to the first optical receiver of the optical determination unit and the input end of the optical regeneration unit, and optical signals from the downstream optical transceiver And the optical signal branched by the second optical splitter is incident on the port 1, and the optical signal is input to the second optical receiver of the optical determination unit via the port 2. A second circulator that emits light, and the first circulator receives the optical signal branched by the second optical splitter, enters the port 3, and emits the optical signal from the port 1, and the second circulator The optical signal from the output end of the optical regenerator is incident on the port 3, and the optical signal is emitted to the second splitter via the port 1, and the determination control circuit of the optical determination unit is Output from first and second optical receivers The user ID or service ID is identified from each of the received electrical signals, and among the optical signals transmitted from the upstream optical transceiver, the user ID or service ID of the optical signal transmitted from the downstream optical transceiver is user ID Alternatively, the optical reproduction unit is controlled to reproduce only the optical signal that matches the service ID.

  The optical repeater according to the present invention further includes an optical data unit for adding data to an empty portion of the optical signal output from the optical regenerator, and the determination control circuit of the optical determination unit transmits from the upstream optical transceiver If the user ID or service ID of the received optical signal does not match the user ID or service ID of the optical signal transmitted from the downstream optical transmitter / receiver, the transmission band freed by the mismatched optical signal is used. It is preferable that the optical data unit is controlled so that data is added to an empty portion of the optical signal from the optical regenerating unit.

  The optical repeater according to the present invention includes a memory that stores information on a user ID or a service ID of an optical signal transmitted from a downstream optical transmitter / receiver in the determination control circuit of the optical determination unit. The determination control circuit reproduces only the optical signal whose user ID or service ID matches the user ID or service ID held in the memory among the optical signals transmitted from the upstream optical transceiver. It is preferable to control the part.

  According to the present invention, it is possible to simultaneously realize the confidentiality of the downlink signal in the TDM-PON system and the optical signal regeneration function necessary for realizing the extension and multi-branching of the optical access system. As a result, the optical transmission / reception apparatus that receives the downlink signal does not need the function of extracting only the optical signal addressed to itself from all the optical signals, and can also add an optical amplification function that is necessary for extending the length. Realization of a simple optical access system can be expected. In addition, the risk of unauthorized viewing of video services that are not subscribed to can be avoided.

1 is an overall configuration diagram of an optical access system according to a first embodiment of the present invention. In the optical access system which concerns on 1st Embodiment, it is a control conceptual diagram of the optical repeater at the time of using a TDM-PON system. In the optical access system which concerns on 1st Embodiment, it is a block diagram of the optical repeater which has the memory which hold | maintains the information of user ID and service ID in the determination control circuit. It is a whole block diagram of the optical access system which concerns on the 2nd Embodiment of this invention. FIG. 10 is a conceptual diagram of control of an optical repeater when a TDM-PON system is used in an optical access system according to a second embodiment. In the optical access system which concerns on 2nd Embodiment, it is a block diagram of the optical repeater which has a memory holding the information of user ID and service ID in the determination control circuit. It is a figure which shows an example of the system construction using the optical access system which concerns on the 1st and 2nd embodiment of this invention.

Embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an overall configuration diagram of an optical access system according to the first embodiment of the present invention. As shown in FIG. 1, in the present invention, one optical transmission / reception apparatus (1000) and N optical transmission / reception apparatuses (1001 to 100N) perform one-to-many optical communication via an optical splitter (1101). The access system is an N optical repeater (1301) between an optical splitter (1101) and N optical transceivers (1001 to 100N) connected via optical fibers (1201 to 120N), respectively. ~ 130N) are connected.

  The optical repeater (1301) is connected to the optical delay line (1301-05) and the optical delay line (1301-05), and is a semiconductor optical amplifier (1301-) that regenerates the optical signal from the upstream optical transceiver (1000). 06), an optical receiver (1301-01) that receives an optical signal from the upstream optical transceiver (1000) and converts it into an electrical signal, and a downstream optical transceiver ( 1001) receives an optical signal from the optical receiver (1301-02) that converts the optical signal into an electrical signal, determines the electrical signal output from each optical receiver (1301-01, 1301-02), and determines the result. Based on the optical decision unit (1301-03) that controls the semiconductor optical amplifier (1301-06) and the optical signal from the upstream optical transceiver (1000). The optical signal from the circulator (1301-08) (which enters from the port 1 and exits from the port 2) and the port 2 of the circulator (1301-08) (1301-01) and an optical splitter (1301-09) branching to the input end of the optical regenerator (1301-07), and an optical splitter (1301-10) branching an optical signal from the downstream optical transceiver (1001) ) And the optical signal branched by the optical splitter (1301-10) from the port 1 and output through the port 2 to the optical receiver (1301-02) of the optical determination unit (1301-04) (1301-11).

  The circulator (1301-08) receives the optical signal branched by the optical splitter (1301-10) from the port 3 and exits from the port 1, and the circulator (1301-11) includes the optical regeneration unit (1301). -07) enters the optical signal from the output end through the port 3 and exits through the port 1 to the optical splitter (1301-10).

  Here, a feature of the present invention is that an optical signal from the upstream optical transceiver (1000) and an optical signal from the downstream optical transceiver (1001) are converted into two optical receivers (1301-01, 1301-02). ), The determination control circuit (1301-03) identifies the user ID or service ID from each electrical signal, and among the optical signals transmitted from the upstream optical transceiver (1000), Light that controls the semiconductor optical amplifier (1301-06) so that only the optical signal whose user ID or service ID matches the user ID or service ID of the optical signal transmitted from the downstream optical transceiver (1001) is reproduced. This is an access system.

  With this configuration, it is possible to simultaneously realize the confidentiality of the downlink signal, the extension of the optical access system, and the multi-branching, and an economic optical access system can be expected.

  FIG. 2 is a conceptual diagram of control of the optical repeater when the TDM-PON system is used in the optical access system according to the first embodiment of the present invention. From the right side of FIG. 2, after an ON / OFF optical signal including user ID or service ID information is transmitted and branched by an optical splitter (1301-10), one optical signal is transmitted to a circulator (1301- 11) is received by the optical receiver (1301-02), and the other optical signal is transmitted through the circulator (1301-08) and transmitted upstream. The signal received by the optical receiver (1301-02) is sent to the determination control circuit (1301-03), and the optical signal of which user ID or which service ID arrives in the determination control circuit (1301-03). To identify.

  From the left side of FIG. 2, an ON / OFF optical signal including information on all user IDs or all service IDs is transmitted. The optical signal passes through the circulator (1301-08) and is transmitted to the optical splitter (1301). Branch at -09). One of the branched optical signals is sent to the optical determining unit (1301-04) and received by the optical receiver (1301-01), and the other optical signal is sent to the optical regenerating unit (1301-07). Sent. The signal received by the optical receiver (1301-01) is sent to the determination control circuit (1301-03), and the determination control circuit (1301-03) receives the signal received by the optical receiver (1301-01). The user ID identified from the signal received by the optical receiver (1301-02), the user ID that matches the service ID, and the service ID signal are identified, and the semiconductor optical amplifier (1301-06) is controlled. Is converted into a control signal.

  The optical signal sent to the optical regenerator (1301-07) passes through the optical delay line (1301-05), and then is sent from the determination control circuit (1301-03) by the semiconductor optical amplifier (1301-06). The signal is reproduced based on the received control signal.

  In FIG. 2, since the head ON signal is not the signal of the corresponding user ID or the corresponding service ID, the semiconductor optical amplifier (1301-06) is controlled to be OFF, and the head of the optical splitter (1301-10) An optical signal is output in a state where the ON signal disappears.

  Here, the optical delay line (1301-05) is sufficiently larger than the time required for the signal reception processing by the optical receiver (1301-01) and the user ID or service ID identification processing in the determination control circuit (1301-03). An optical delay line for a long time is used. The determination control circuit (1301-03) has a function of generating a clock signal based on a signal from the optical receiver (1301-01), and the distance between the clock signal and the designed optical delay line, In consideration of the time required for the signal reception processing by the optical receiver (1301-01) and the user ID or service ID identification processing in the determination control circuit (1301-03), reproduction is performed after passing through the optical delay line (1301-05). The timing at which the power signal passes through the semiconductor optical amplifier (1301-06) is matched with the control timing of the semiconductor optical amplifier (1301-06).

  By configuring in this way and controlling the semiconductor optical amplifier (1301-06), an optical access system is realized in which only the optical signal with the matching user ID or service ID is reproduced by the semiconductor optical amplifier (1301-06). be able to.

  FIG. 3 shows an optical access system according to the first embodiment of the present invention, in which an optical having a memory for storing user ID and service ID information of an optical signal transmitted from a downstream optical transceiver in the determination control circuit. It is a figure which shows the structure of a relay apparatus. 2 is different from the optical repeater shown in FIG. 2 in that an information memory (1301-031) is provided in the determination control circuit (1301-03).

  From the right side of FIG. 3, an optical signal including user ID and service ID information is transmitted. The optical signal is branched by an optical splitter (1301-10) and then transmitted through a circulator (1301-11). And received by the optical receiver (1301-02). The signal received by the optical receiver (1301-02) is sent to the determination control circuit (1301-03). The determination control circuit (1301-03) identifies the user ID and service ID, and identifies the identified user. ID and service ID information is stored in an information memory (1301-031) in the determination control circuit (1301-03).

In an optical repeater that does not have an information memory, it is necessary to extract user ID or service ID information from the optical signal every time an optical signal is transmitted from a downstream optical transmitter / receiver. Since the information of the user ID or service ID of the downstream optical transmission / reception apparatus once connected can be held in the information memory, the determination control circuit of the optical determination unit receives an optical signal from the downstream optical transmission / reception apparatus. It is not necessary to extract the user ID or service ID information from the optical signal each time, and by referring to the information in the information memory (1301-031), the user ID of the optical signal from the upstream optical transceiver or It is possible to identify whether or not the service ID matches the user ID or service ID of the downstream optical transmission / reception device, and the speed of the identification operation can be expected
Further, in the present optical repeater, the determination control circuit of the light determination unit receives the information from the downstream optical transceiver by holding the user ID or service ID information of the downstream optical transceiver once connected in the information memory. Even when the signal has not arrived, by referring to the information in the information memory (1301-031), the user ID or service ID of the optical signal from the upstream optical transmitter / receiver can be changed to the user ID of the downstream optical transmitter / receiver or It can be identified whether or not it matches the service ID, and speeding up of the identification operation can be expected.

  Information on the user ID and service ID in the information memory (1301-031) is, for example, when a new service is added to the downstream optical transceiver, or when the downstream optical transceiver is removed and reconnected. It is updated at the opportunity.

(Second Embodiment)
FIG. 4 is an overall configuration diagram of an optical access system according to the second embodiment of the present invention. As shown in FIG. 4, the present invention is an optical system in which one optical transceiver (1000) and N optical transceivers (1001 to 100N) perform one-to-many optical communication via an optical splitter (1101). The access system is an N optical repeater (1301) between an optical splitter (1101) and N optical transceivers (1001 to 100N) connected via optical fibers (1201 to 120N), respectively. ~ 130N) are connected.

  The optical repeater (1301) is connected to the optical delay line (1301-05) and the optical delay line (1301-05), and is a semiconductor optical amplifier (1301-) that regenerates the optical signal from the upstream optical transceiver (1000). 06), an optical receiver (1301-01) that receives an optical signal from the upstream optical transceiver (1000) and converts it into an electrical signal, and a downstream optical transceiver ( 1001) receives an optical signal from the optical receiver (1301-02) that converts the optical signal into an electrical signal, determines the electrical signal output from each optical receiver (1301-01, 1301-02), and determines the result. And an optical signal output from the optical regenerator (1301-07) and an optical regenerator (1301-07) comprising a determination control circuit (1301-03) for controlling the semiconductor optical amplifier (1301-06) The optical data part (1301-12) for adding data to the empty part, the optical signal output from the optical reproduction part (1301-07) and the optical signal output from the optical data part (1301-12) are combined. An optical splitter (1301-13), a circulator (1301-08) that transmits optical signals from the upstream optical transceiver (1000) (enters from port 1 and exits from port 2), and circulator (1301- Optical splitter (1301-09) which branches the optical signal from port 2 of (08) to the input terminal of the optical receiver (1301-01) of the optical determination unit (1301-04) and the optical regeneration unit (1301-07) And an optical splitter (1301-10) for branching the optical signal from the downstream optical transceiver (1001), and an optical signal branched by the optical splitter (1301-10) Incident from over sheet 1, and a circulator (1301-11) for emitting to the optical receiver (1301-02) of the light determination unit (1301-04) via the port 2.

  The circulator (1301-08) receives the optical signal branched by the optical splitter (1301-10) from the port 3 and exits from the port 1, and the circulator (1301-11) includes the optical regeneration unit (1301). -07) enters the optical signal from the output end through the port 3 and exits through the port 1 to the optical splitter (1301-10).

  Here, a feature of the present invention is that an optical signal from the upstream optical transceiver (1000) and an optical signal from the downstream optical transceiver (1001) are converted into two optical receivers (1301-01, 1301-02). ), The determination control circuit (1301-03) identifies the user ID or service ID from each electrical signal, and among the optical signals transmitted from the upstream optical transceiver (1000), Controlling the semiconductor optical amplifier (1301-06) so that only the optical signal whose user ID or service ID matches the user ID or service ID of the optical signal transmitted from the downstream optical transceiver (1001), If the user ID or the service ID does not match, the transmission band that is vacant by the mismatched optical signal is used, and the optical regenerator (1301-07) is used. Resides in that the optical access system for controlling the optical data unit (1301-12) to add the data using an optical splitter (1301-13) in the empty portion of the optical signal from the.

  Data to be added from the optical data section (1301-12) is acquired from a storage server separately installed in the optical repeater (1301), or is acquired from another remote storage server via another optical fiber. A method of obtaining the optical signal by wavelength multiplexing with the optical signal transmitted from the optical transmission / reception apparatus (1000) instead of the other optical fiber is conceivable.

  With this configuration, it is possible to simultaneously realize the confidentiality of the downlink signal, the extension of the optical access system, and the multi-branch, which can be expected to realize an economical optical access system, and effectively use the free transmission band. be able to. With this system, it is possible to provide different information or video programs for each corresponding user ID and service ID.

  FIG. 5 is a conceptual diagram of control of the optical repeater when the TDM-PON system is used in the optical access system according to the second embodiment of the present invention. From the right side of FIG. 5, an ON / OFF optical signal including user ID or service ID information is transmitted and branched by an optical splitter (1301-11), and then one optical signal is transmitted to a circulator (1301- 11) is received by the optical receiver (1301-02), and the other optical signal is transmitted through the circulator (1301-08) and transmitted upstream. The signal received by the optical receiver (1301-02) is sent to the determination control circuit (1301-03), and the optical signal of which user ID or which service ID arrives in the determination control circuit (1301-03). To identify.

  From the left side of FIG. 5, an ON / OFF optical signal including information on all user IDs or all service IDs is transmitted. The optical signal passes through the circulator (1301-08) and is transmitted to the optical splitter (1301). Branch at -09). One of the branched optical signals is input to the optical determination unit (1301-04) and received by the optical receiver (1301-01), and the other optical signal is input to the optical regeneration unit (1301-07). Sent. The signal received by the optical receiver (1301-01) is sent to the determination control circuit (1301-03), and the determination control circuit (1301-03) receives the signal received by the optical receiver (1301-01). The user ID identified from the signal received by the optical receiver (1301-02), the user ID that matches the service ID, and the service ID signal are identified, and the semiconductor optical amplifier (1301-06) is controlled. Is converted into a control signal.

  The optical signal sent to the optical regenerator (1301-07) passes through the optical delay line (1301-05), and then is sent from the determination control circuit (1301-03) by the semiconductor optical amplifier (1301-06). The signal is reproduced based on the received control signal.

In FIG. 5, the leading ON signal is not the signal of the corresponding user ID or the signal of the corresponding service ID, so the semiconductor optical amplifier (1301-06) is controlled to be OFF.
The optical data section (1301-12) obtains empty information of the time slot to be transmitted based on the control signal sent from the determination control circuit (1301-03), and based on the information, optical reproduction Data is added to the empty part of the optical signal from the unit (1301-07) using the optical splitter (1301-13). As a result, an optical signal is output from the optical splitter (1301-10) with another ON signal added to the leading ON signal.

  Here, the optical delay line (1301-05) is sufficiently larger than the time required for the signal reception processing by the optical receiver (1301-01) and the user ID or service ID identification processing in the determination control circuit (1301-03). An optical delay line for a long time is used. The determination control circuit (1301-03) has a function of generating a clock signal based on a signal from the optical receiver (1301-01), and the distance between the clock signal and the designed optical delay line, In consideration of the time required for the signal reception processing by the optical receiver (1301-01) and the user ID or service ID identification processing in the determination control circuit (1301-03), reproduction is performed after passing through the optical delay line (1301-05). The timing at which the power signal passes through the semiconductor optical amplifier (1301-06) is matched with the control timing of the semiconductor optical amplifier (1301-06). Further, the optical signal transmitted from the optical data unit (1301-12) is controlled not to collide with the optical signal output from the optical regenerating unit (1301-07).

  By configuring in this way and controlling the semiconductor optical amplifier (1301-06), an optical access system is realized in which only the optical signal with the matching user ID or service ID is reproduced by the semiconductor optical amplifier (1301-06). be able to. Further, it is possible to provide different information, video programs, etc. for each corresponding user ID by using the free transmission band.

  FIG. 6 shows an optical access system according to the second embodiment of the present invention, in which an optical having a memory for storing user ID and service ID information of an optical signal transmitted from a downstream optical transceiver in the determination control circuit. It is a figure which shows the structure of a relay apparatus. The configuration differs from the optical repeater shown in FIG. 5 in that an information memory (1301-031) is provided in the determination control circuit (1301-03).

  From the right side of FIG. 6, an optical signal including user ID and service ID information is transmitted. The optical signal is branched by an optical splitter (1301-10) and then transmitted through a circulator (1301-11). And received by the optical receiver (1301-02). The signal received by the optical receiver (1301-02) is sent to the determination control circuit (1301-03). The determination control circuit (1301-03) identifies the user ID and service ID, and identifies the identified user. ID and service ID information is stored in an information memory (1301-031) in the determination control circuit (1301-03).

The expected effect of such a configuration is the same as that of the optical repeater shown in FIG. In other words, in the present optical repeater, since the information of the user ID or service ID of the downstream optical transmitter / receiver once connected can be held in the information memory, the determination control circuit of the optical determination unit is connected to the downstream optical transmitter / receiver. It is not necessary to extract user ID or service ID information from the optical signal every time an optical signal is transmitted from the optical signal, and by referring to the information in the information memory (1301-031), the upstream optical transmission / reception apparatus It is possible to identify whether or not the user ID or service ID of the optical signal coincides with the user ID or service ID of the downstream optical transmission / reception apparatus, and the speed of the identification operation can be expected.
Further, in the present optical repeater, the determination control circuit of the light determination unit receives the information from the downstream optical transceiver by holding the user ID or service ID information of the downstream optical transceiver once connected in the information memory. Even when the signal has not arrived, by referring to the information in the information memory (1301-031), the user ID or service ID of the optical signal from the upstream optical transmitter / receiver can be changed to the user ID of the downstream optical transmitter / receiver or It can be identified whether or not it matches the service ID, and speeding up of the identification operation can be expected.

FIG. 7 is a diagram showing an example of a system construction using the optical access system according to the first and second embodiments of the present invention.
In this system construction example, in order to enable wide-area accommodation, an optical transmission / reception device (2000) is installed in a facility located one upstream, and an optical repeater (2011-201N) is installed therebelow. The optical repeaters (2011-201N) include optical transceivers (2031-1 to 2031-M, 2032-1 to 2032-M, which are installed in user's homes, etc. via optical splitters (2021 to 202N), respectively. ... 203N-1 to 203N-M) are connected.
With this configuration, only the optical signal of service A is distributed to the optical transmission / reception devices (2031-1 to 2031-M), and service B is transmitted to the optical transmission / reception devices (2032-1 to 2032-M). By distributing only the optical signal, control in units of accommodation groups becomes possible.

1000, 1001 to 100N, 2000, 2031-1 to 2031-M, 2032-1 to 2032-M, 203N-1 to 203N-M Optical transceivers 1101, 1301-09, 1301-10, 1301-13, 2021 202N Optical splitters 1201 to 120N Optical fibers 1301 to 130N, 2011 to 201N Optical repeaters 1301-01, 1301-02 Optical receivers 1301-03 Determination control circuit 1301-031 Information memory 1301-04- Optical determination unit 1301-05 Optical delay Line 1301-06 Semiconductor optical amplifier 1301-07 Optical regenerating unit 1301-08, 1301-11 Circulator 1301-12 Optical data unit

Claims (8)

In an optical access system in which one optical transceiver and a plurality of optical transceivers perform one-to-many optical communication via an optical splitter,
An optical repeater is connected between the optical splitter and the plurality of optical transceivers,
The optical repeater is
An optical regeneration unit that reproduces an optical signal from an upstream optical transceiver;
A first optical receiver that receives an optical signal from an upstream optical transceiver, a second optical receiver that receives an optical signal from a downstream optical transceiver, and the first and second optical receivers The user ID or service ID is identified from each of the electrical signals output from the optical signal transmitted from the upstream optical transceiver, and the user ID or service ID of the optical signal transmitted from the downstream optical transceiver is transmitted. An optical determination unit comprising a determination control circuit for controlling the optical reproduction unit so as to reproduce only an optical signal that matches a user ID or a service ID;
An optical access system comprising: In an optical access system in which one optical transceiver and a plurality of optical transceivers perform one-to-many optical communication via an optical splitter,
An optical repeater is connected between the optical splitter and the plurality of optical transceivers,
The optical repeater is
An optical regeneration line comprising an optical delay line and an optical amplifier connected to the optical delay line and regenerating an optical signal from an upstream optical transceiver;
A first optical receiver that receives an optical signal from an upstream optical transceiver, a second optical receiver that receives an optical signal from a downstream optical transceiver, and the first and second optical receivers A light determination unit including a determination control circuit that determines an electrical signal output from the control unit and controls the light regeneration unit based on the determination result;
A first circulator for allowing an optical signal from an upstream optical transceiver to enter port 1 and to emit the optical signal from port 2;
A first optical splitter that receives an optical signal from the port 2 of the first circulator and branches the optical signal to a first optical receiver of the optical determination unit and an input end of the optical reproduction unit;
A second optical splitter for branching an optical signal from a downstream optical transceiver,
A second circulator that causes the optical signal branched by the second optical splitter to be incident on the port 1 and to emit the optical signal to the second optical receiver of the light determination unit via the port 2;
In the first circulator, the optical signal branched by the second optical splitter is incident on the port 3, and the optical signal is emitted from the port 1,
In the second circulator, an optical signal from the output end of the optical regeneration unit is incident on the port 3, and the optical signal is emitted to the second splitter through the port 1,
The determination control circuit of the optical determination unit identifies a user ID or a service ID from each of the electrical signals output from the first and second optical receivers, and transmits an optical signal transmitted from an upstream optical transceiver. Among these, the optical access unit controls the optical reproduction unit so as to reproduce only an optical signal whose user ID or service ID matches the user ID or service ID of the optical signal transmitted from the downstream optical transceiver. system. The optical repeater further includes an optical data unit for adding data to an empty portion of an optical signal output from the optical regenerator,
In the determination control circuit of the optical determination unit, the user ID or service ID of the optical signal transmitted from the upstream optical transceiver is inconsistent with the user ID or service ID of the optical signal transmitted from the downstream optical transceiver. In this case, the optical data unit is controlled so as to add data to a vacant part of the optical signal from the optical regenerating unit using a transmission band vacated by the mismatched optical signal. Item 3. The optical access system according to Item 1 or 2. A memory for storing information on a user ID or a service ID of an optical signal transmitted from a downstream optical transceiver in the determination control circuit of the optical determination unit;
The determination control circuit of the optical determination unit reproduces only the optical signal whose user ID or service ID matches the user ID or service ID held in the memory among the optical signals transmitted from the upstream optical transceiver. The optical access system according to claim 1, wherein the optical regeneration unit is controlled as described above. An optical repeater installed on the downstream side of the optical splitter of an optical access system in which one optical transceiver and a plurality of optical transceivers perform one-to-many optical communication via an optical splitter,
An optical regeneration unit that reproduces an optical signal from an upstream optical transceiver;
A first optical receiver that receives an optical signal from an upstream optical transceiver, a second optical receiver that receives an optical signal from a downstream optical transceiver, and the first and second optical receivers The user ID or service ID is identified from each of the electrical signals output from the optical signal transmitted from the upstream optical transceiver, and the user ID or service ID of the optical signal transmitted from the downstream optical transceiver is transmitted. An optical determination unit comprising a determination control circuit for controlling the optical reproduction unit so as to reproduce only an optical signal that matches a user ID or a service ID;
An optical repeater comprising: An optical repeater installed on the downstream side of the optical splitter of an optical access system in which one optical transceiver and a plurality of optical transceivers perform one-to-many optical communication via an optical splitter,
An optical regeneration line comprising an optical delay line and an optical amplifier connected to the optical delay line and regenerating an optical signal from an upstream optical transceiver;
A first optical receiver that receives an optical signal from an upstream optical transceiver, a second optical receiver that receives an optical signal from a downstream optical transceiver, and the first and second optical receivers A light determination unit including a determination control circuit that determines an electrical signal output from the control unit and controls the light regeneration unit based on the determination result;
A first circulator for allowing an optical signal from an upstream optical transceiver to enter port 1 and to emit the optical signal from port 2;
A first optical splitter that receives an optical signal from the port 2 of the first circulator and branches the optical signal to a first optical receiver of the optical determination unit and an input end of the optical reproduction unit;
A second optical splitter for branching an optical signal from a downstream optical transceiver,
A second circulator that causes the optical signal branched by the second optical splitter to be incident on the port 1 and to emit the optical signal to the second optical receiver of the light determination unit via the port 2;
In the first circulator, the optical signal branched by the second optical splitter is incident on the port 3, and the optical signal is emitted from the port 1,
In the second circulator, an optical signal from the output end of the optical regeneration unit is incident on the port 3, and the optical signal is emitted to the second splitter through the port 1,
The determination control circuit of the optical determination unit identifies a user ID or a service ID from each of the electrical signals output from the first and second optical receivers, and transmits an optical signal transmitted from an upstream optical transceiver. Among these, the optical repeater controls the optical regenerator so as to reproduce only the optical signal whose user ID or service ID matches the user ID or service ID of the optical signal transmitted from the downstream optical transceiver. apparatus. An optical data unit for adding data to an empty portion of the optical signal output from the optical regenerator,
In the determination control circuit of the optical determination unit, the user ID or service ID of the optical signal transmitted from the upstream optical transceiver is inconsistent with the user ID or service ID of the optical signal transmitted from the downstream optical transceiver. In this case, the optical data unit is controlled so as to add data to a vacant part of the optical signal from the optical regenerating unit using a transmission band vacated by the mismatched optical signal. Item 7. The optical repeater according to Item 5 or 6. A memory for storing information on a user ID or a service ID of an optical signal transmitted from a downstream optical transceiver in the determination control circuit of the optical determination unit;
The determination control circuit of the optical determination unit reproduces only the optical signal whose user ID or service ID matches the user ID or service ID held in the memory among the optical signals transmitted from the upstream optical transceiver. The optical repeater according to any one of claims 5 to 7, wherein the optical regenerator is controlled as described above.

Images