JP2011004178A - Optical signal determination device, terminal connection method, terminal, and method for selecting fixed wavelength light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical signal determination device, a terminal connection method which connect a terminal carrying a fixed wavelength light source to a wavelength division multiplexing type optical transmission system, its terminal, and a method for selecting the fixed wavelength light source which selects the fixed wavelength light source of the terminal.SOLUTION: The optical signal determination device 20 includes: a wavelength measuring instrument 21 which measures wavelength of a downlink optical signal Sd-x from a station device 11; a correspondence table 24 regarding wavelength of a downlink optical signal Sd-n and an uplink optical signal Su-n to the station device; and a determination circuit 22 which collates the wavelength of the downlink optical signal Sd-x measured by the wavelength measuring instrument 21 with the correspondence table 24 to determine wavelength of a corresponding uplink optical signal Su-x.

Description

  The present invention relates to an optical signal determination device for determining a wavelength of a required upstream optical signal, a terminal device connection method for newly connecting a terminal device to a wavelength division multiplexing optical transmission system, the terminal device, and the terminal device. The present invention relates to a fixed wavelength light source selection method for selecting a fixed wavelength light source.

  Wavelength division in which a downstream optical signal obtained by demultiplexing a wavelength multiplexed optical signal from a station apparatus is coupled to a plurality of terminal apparatuses, and an upstream optical signal from the terminal apparatus is combined to couple a wavelength multiplexed optical signal to the station apparatus Multiplexed optical transmission systems, for example, WDM-PON (Wavelength Division Multiplexing-Passive Optical Network) have been proposed. In WDM-PON, the number of terminal devices can be increased as the number of subscribers increases. As a terminal device connected to the WDM-PON, a terminal device that determines the wavelength of the upstream optical signal from information included in the downstream optical signal and adjusts the light of the mounted variable wavelength light source to the wavelength is proposed. (For example, see Patent Document 1). As the variable wavelength light source, for example, a variable wavelength laser diode is known. When connecting a terminal device equipped with this variable wavelength laser diode to a wavelength division multiplexing optical transmission system, an operator first connects the terminal device to the multiplexing optical transmission system so that the upstream optical signal reaches the station device. Therefore, the wavelength of the variable wavelength laser diode is adjusted.

JP 2006-166446 A

  However, the variable wavelength laser diode is expensive, and there is a problem in terms of cost to connect the terminal device on which the variable wavelength laser diode is mounted to the wavelength division multiplexing optical transmission system according to the increase in subscribers.

  On the other hand, when connecting a terminal device equipped with an inexpensive fixed wavelength light source to a wavelength division multiplexing optical transmission system, the following problems are assumed. In a work site where a terminal device is connected to an optical fiber of a wavelength division multiplexing optical transmission system, the required wavelength of the upstream optical signal is unknown. For this reason, it is impossible for an operator to select a terminal device that outputs an optical signal of which wavelength.

  Therefore, the present invention provides an optical signal determination device, a terminal device connection method, a terminal device thereof, and a fixed wavelength light source of the terminal device that enable a terminal device equipped with a fixed wavelength light source to be connected to a wavelength division multiplexing optical transmission system. An object of the present invention is to provide a method for selecting a fixed wavelength light source to be selected.

  In order to achieve the above object, the present invention provides a wavelength division multiplexing type terminal device that checks the downstream optical signal by the optical signal determination device, determines the wavelength of the upstream optical signal required, and outputs the light of that wavelength. It was decided to connect to the optical transmission system.

  Specifically, the optical signal determination device according to the present invention includes a wavelength measuring device that measures the wavelength of the downstream optical signal from the station device, and a correspondence table regarding the wavelength of the downstream optical signal and the upstream optical signal to the station device. And a determination circuit that compares the wavelength of the downstream optical signal measured by the wavelength measuring device with the correspondence table and determines the wavelength of the corresponding upstream optical signal.

  The optical signal determination device includes a correspondence table in which wavelengths of upstream optical signals corresponding to predetermined downstream optical signal wavelengths are described. If an optical signal determination device is connected to the optical fiber of the wavelength division multiplexing optical transmission system to which the terminal device is to be connected, the optical signal determination device detects the wavelength of the downstream optical signal output from the optical fiber, and The wavelength of the upstream optical signal designated for the optical fiber can be determined. As a result, the operator can select a terminal device equipped with a fixed wavelength light source that outputs light of that wavelength and connect it to the wavelength division multiplexing optical transmission system.

  Therefore, the present invention can provide an optical signal determination device that enables a terminal device equipped with a fixed wavelength light source to be connected to a wavelength division multiplexing optical transmission system.

  An optical signal determination device according to the present invention includes an information receiving circuit that reads information about a wavelength of an upstream optical signal to the station device, which is included in a downstream optical signal from the station device, and the information read by the information receiving circuit. And a determination circuit that determines the wavelength of the upstream optical signal based on the determination circuit.

  When the station device outputs information related to the wavelength of the upstream optical signal in the downstream optical signal, the optical signal determination device can read the information. If an optical signal determination device is connected to the optical fiber of the wavelength division multiplexing optical transmission system to which the terminal device is to be connected, the optical signal determination device reads information contained in the downstream optical signal output from the optical fiber, and The wavelength of the upstream optical signal designated for the optical fiber can be determined. As a result, the operator can select a terminal device equipped with a fixed wavelength light source that outputs light of that wavelength and connect it to the wavelength division multiplexing optical transmission system.

  Therefore, the present invention can provide an optical signal determination device that enables a terminal device equipped with a fixed wavelength light source to be connected to a wavelength division multiplexing optical transmission system.

  The optical signal determination device according to the present invention preferably further includes a display circuit that displays the wavelength of the upstream optical signal determined by the determination circuit. The operator can easily confirm information on the wavelength displayed on the display circuit.

  A terminal apparatus connection method according to the present invention combines a downstream optical signal obtained by demultiplexing a wavelength multiplexed optical signal from a station apparatus into a plurality of terminal apparatuses, and combines the upstream optical signal from the terminal apparatus to combine the wavelength multiplexed optical signal. A terminal device connection method for newly connecting a terminal device equipped with a fixed wavelength light source in a wavelength division multiplexing optical transmission system that couples a signal to the station device, wherein the optical signal determination device checks the downstream optical signal, An inspection procedure for determining the wavelength of the corresponding upstream optical signal, and a connection procedure for connecting a terminal device that outputs an upstream optical signal having the wavelength determined in the inspection procedure to an optical fiber connected to the station device.

  The worker first connects the optical signal determination device to the optical fiber of the wavelength division multiplexing optical transmission system to which the terminal device is to be connected. The optical signal determination device determines the wavelength of the upstream optical signal designated for the optical fiber from the wavelength of the downstream optical signal output from the optical fiber. The operator can see the determination result of the signal determination device, select a terminal device equipped with a fixed wavelength light source that outputs light of the determined wavelength, and connect it to the wavelength division multiplexing optical transmission system.

  Therefore, the present invention can provide a terminal device connection method that enables a terminal device equipped with a fixed wavelength light source to be connected to a wavelength division multiplexing optical transmission system.

  A terminal apparatus connection method according to the present invention combines a downstream optical signal obtained by demultiplexing a wavelength multiplexed optical signal from a station apparatus into a plurality of terminal apparatuses, and combines the upstream optical signal from the terminal apparatus to combine the wavelength multiplexed optical signal. A terminal device connection method for newly connecting a terminal device equipped with a fixed wavelength light source in a wavelength division multiplexing optical transmission system that couples a signal to the station device, wherein the optical signal determination device checks the downstream optical signal, The inspection procedure for determining the wavelength of the corresponding upstream optical signal, and the fixed wavelength light source that outputs the upstream optical signal of the wavelength determined by the inspection procedure is incorporated in the newly connected terminal device, and the fixed wavelength light source is incorporated. A connection procedure for connecting the terminal device to an optical fiber connected to the station device.

  When the station device outputs information related to the wavelength of the upstream optical signal in the downstream optical signal, the optical signal determination device can read the information. The worker first connects the optical signal determination device to the optical fiber of the wavelength division multiplexing optical transmission system to which the terminal device is to be connected. The optical signal determination device reads information included in the downstream optical signal output from the optical fiber, and determines the wavelength of the upstream optical signal designated for the optical fiber. The operator sees the determination result of the signal determination device and incorporates a fixed wavelength light source that outputs light of the determined wavelength into the terminal device. Thus, the operator can connect the terminal device that outputs light of the required wavelength to the optical fiber of the wavelength division multiplexing optical transmission system.

  Therefore, the present invention can provide a terminal device connection method that enables a terminal device equipped with a fixed wavelength light source to be connected to a wavelength division multiplexing optical transmission system.

  A terminal device according to the present invention incorporates a light receiving circuit that receives a downstream optical signal from a station device, the optical signal determination device, and a fixed wavelength light source that outputs an upstream optical signal having a wavelength determined by the optical signal determination device. And an optical output circuit capable of outputting an upstream optical signal from the fixed wavelength light source toward the station device.

  This terminal device has a built-in optical signal determination device, and can further switch a fixed wavelength light source. When connecting this terminal device to the wavelength division multiplexing optical transmission system, check the connection procedure for connecting to the optical fiber connected to the station device and the optical signal determination device for the downstream optical signal from the station device. An inspection procedure for determining the wavelength of the upstream optical signal to be performed, and an installation procedure for incorporating a fixed wavelength light source that outputs the upstream optical signal having the wavelength determined in the inspection procedure toward the station device, into the light source insertion unit. For this reason, the operator connects the terminal device to the optical fiber of the wavelength division multiplexing optical transmission system, and uses a fixed wavelength light source that matches the wavelength information of the upstream optical signal displayed by the optical signal determination device as the light source insertion unit. The connection of the terminal device to the wavelength division multiplexing optical transmission system can be completed simply by inserting.

  Therefore, the present invention can provide a terminal device connectable to the wavelength division multiplexing optical transmission system and a fixed wavelength light source selection method for selecting a fixed wavelength light source of the terminal device.

  The present invention selects an optical signal determination apparatus, a terminal apparatus connection method, a terminal apparatus thereof, and a fixed wavelength light source of the terminal apparatus that enable a terminal apparatus equipped with a fixed wavelength light source to be connected to a wavelength division multiplexing optical transmission system. A fixed wavelength light source selection method can be provided.

It is a block diagram explaining a wavelength division multiplexing optical transmission system. It is a block diagram explaining the optical signal determination apparatus which concerns on this invention. It is a block diagram explaining the optical signal determination apparatus which concerns on this invention. It is a block diagram explaining the terminal device which concerns on this invention. It is a block diagram explaining the terminal device which concerns on this invention.

  Hereinafter, the present invention will be described in detail with specific embodiments, but the present invention is not construed as being limited to the following description. In the present specification and drawings, the same reference numerals denote the same components.

(First embodiment)
FIG. 1 is a configuration diagram illustrating a wavelength division multiplexing optical transmission system that requires the optical signal determination apparatus of the present embodiment. In the wavelength division multiplexing optical transmission system, the station device 11 and the composite multiplexer / demultiplexer 12 are connected by an optical fiber 15, and the composite multiplexer / demultiplexer 12 and the terminal device 13-n (n is a natural number) Are connected by an optical fiber 16-n. In the wavelength division multiplexing optical transmission system, the downstream optical signal Sd-n obtained by demultiplexing the wavelength multiplexed optical signal Sd-0 from the station apparatus 11 is coupled to a plurality of terminal apparatuses 13-n, and is transmitted from the terminal apparatus 13-n. The upstream optical signal Su-n is multiplexed and the wavelength multiplexed optical signal Su-0 is coupled to the station apparatus 11.

  In FIG. 1, only one station apparatus 11 is provided, but a plurality of station apparatuses 11 may be connected using a composite multiplexer / demultiplexer. The terminal device 13-n is equipped with a fixed wavelength light source. The composite multiplexer / demultiplexer 12 demultiplexes the wavelength multiplexed optical signal Sd-0 for each wavelength of the downstream optical signal Sd-n. The composite multiplexer / demultiplexer 12 multiplexes the upstream optical signal Su-n from each terminal device 13-n and couples it to the station device 11 as a wavelength multiplexed optical signal Su-0. The composite multiplexer / demultiplexer 12 is, for example, an arrayed waveguide grating (AWG).

  In the wavelength division multiplexing optical transmission system of FIG. 1, the downstream optical signal Sd-n and the upstream optical signal Su-n do not collide, and the downstream optical signals Sd-n and upstream optical signals Su-n The wavelengths of the downstream optical signal Sd-n and upstream optical signal Su-n are determined for each optical fiber 16-n so as not to collide.

  A terminal device is not yet connected to the optical fiber 16-x (1 ≦ x ≦ n) in FIG. Here, a case where a terminal device is newly connected will be described. A terminal device that outputs an upstream optical signal having a wavelength defined in the optical fiber 16-x must be connected. For this reason, the worker starts by knowing the wavelength of the upstream optical signal required by the optical fiber 16-x.

  Therefore, the operator connects the optical signal determination device before connecting the terminal device, and performs a terminal device connection method for checking the wavelength of the determined upstream optical signal. In this terminal device connection method, an optical signal determination device inspects the downstream optical signal Sd-x, determines the wavelength of the corresponding upstream optical signal Su-x, and upstream light having the wavelength determined in the inspection procedure. A connection procedure for connecting a terminal device that outputs the signal Su-x to the optical fiber 16-x.

  FIG. 2 is a block diagram illustrating the optical signal determination device 20 used here. The optical signal determination device 20 includes a wavelength measuring device 21 that measures the wavelength of the downstream optical signal Sd-x from the station device 11, and the wavelengths of the downstream optical signal Sd-n and the upstream optical signal Su-n to the station device. And a determination circuit 22 that compares the wavelength of the downstream optical signal Sd-x measured by the wavelength measuring device 21 with the correspondence table 24 and determines the wavelength of the corresponding upstream optical signal Su-x. The optical signal determination device 20 further includes a display circuit 26 that displays the wavelength of the upstream optical signal Su-x determined by the determination circuit 22.

  The correspondence table 24 is a correspondence table between the wavelength of the downstream optical signal Sd-n and the upstream optical signal Su-n determined in advance in the wavelength division multiplexing optical transmission system of FIG. In the correspondence table 24, a symbol number corresponding to the wavelength may be described.

  The determination circuit 22 inquires the correspondence table 24 about the wavelength of the downstream optical signal Sd-x measured by the wavelength measuring device 21. When the symbol number is described in the correspondence table 24, the determination circuit 22 inquires the correspondence table 24 about the symbol number corresponding to the wavelength of the downstream optical signal Sd-x. When the determination circuit 22 is notified of the wavelength of the upstream optical signal Su-x corresponding to the downstream optical signal Sd-x from the correspondence table 24, the determination circuit 22 displays the wavelength on the display circuit 26 as a numerical value. When the notification from the correspondence table 24 is a symbol number, the determination circuit 22 causes the display circuit 26 to display the symbol number. Alternatively, the determination circuit 22 may include a plurality of lamps, and a lamp indicating the wavelength of the upstream optical signal Su-x may be turned on.

  The operator connects the optical signal determination device 20 to the optical fiber 16-x by an inspection procedure, and checks the wavelength of the upstream optical signal. Then, the operator looks at the wavelength, the symbol number, or the lit lamp displayed on the display circuit 26 in the connection procedure, and connects the correct terminal device, that is, the terminal device 13-x that outputs the upstream optical signal Su-x to the optical fiber 16. -X can be connected.

  The terminal device 13-x may have a structure in which a fixed wavelength light source can be replaced. After checking the wavelength of the upstream optical signal determined by the optical signal determination device 20, the worker incorporates a fixed wavelength light source having the designated wavelength into the terminal device 13-x to be connected, and installs the terminal device 13-x. A terminal device connection method for connecting to the optical fiber 16-x is performed. In this terminal device connection method, the optical signal determination device 20 checks the downstream optical signal Sd-x, determines the wavelength of the corresponding upstream optical signal Su-x, and the newly connected terminal device 13-x. A connection procedure for incorporating a fixed wavelength light source that outputs the upstream optical signal Su-x having the wavelength determined in the inspection procedure, and connecting the terminal device 13-x incorporating the fixed wavelength light source to the optical fiber 16-x. Prepare.

  In the case of a terminal device in which the fixed wavelength light source can be replaced, the operator does not have to take a plurality of terminal devices to the connection site. The operator can take one terminal device and a plurality of small fixed wavelength light sources to the work site, and the fixed wavelength light source having the wavelength displayed by the optical signal determination device can be incorporated into the terminal device at the work site, so that work efficiency is improved.

  In this case, the terminal device 13-x may include the optical signal determination device 20. FIG. 4 is a block diagram illustrating the terminal device 13-x. The terminal device 13-x includes a light receiving circuit 42 that receives a downstream optical signal from the station device 11, an optical signal determination device 20, and a fixed wavelength light source that outputs an upstream optical signal having a wavelength determined by the optical signal determination device 20. And an optical output circuit 43 that outputs an upstream optical signal Su-n to the station apparatus 11.

  When the terminal device 13-x includes the optical signal determination device 20, the operator connects the terminal device 13-x to the optical fiber 16-x, and the optical signal determination device 20 uses the downstream optical signal Sd-. an inspection procedure for inspecting x and determining the wavelength of the corresponding upstream optical signal Su-x, and a fixed wavelength light source that outputs the upstream optical signal Su-x having the wavelength determined in the inspection procedure toward the station apparatus 11 as a light source A fixed wavelength light source selection method including an assembling procedure to be incorporated into the insertion unit 46.

  The operator connects the terminal device 13-x to the optical fiber 16-x, and uses a light source insertion unit for a fixed wavelength light source corresponding to the wavelength, symbol number, or lit lamp displayed on the display circuit 26 of the terminal device 13-x. The connection work can be completed by inserting it into 46.

  Here, the fixed wavelength light source may have a three-dimensional shape identification unit corresponding to the wavelength or symbol number, and the light source insertion unit 46 may have a fitting unit that fits with the identification unit of the fixed wavelength light source. The fitting portion changes its shape according to the wavelength of the downstream optical signal. Even if an operator tries to insert a fixed wavelength light source having an incorrect wavelength into the light source insertion portion 46, the fixed wavelength light source cannot be inserted into the light source insertion portion 46 because the fitting portion and the identification portion do not match. The fixed wavelength light source has such an identification part, and the light source insertion part 46 has such a fitting part, so that it is possible to prevent an operator from making a mistake.

(Second Embodiment)
The configuration of the wavelength division multiplexing optical transmission system of the second embodiment is the same as that of the wavelength division multiplexing optical transmission system of FIG. 1, but the station apparatus 11 transmits the upstream optical signal Su-n to each downstream optical signal Sd-n. The difference is that wavelength information is included. For example, the station apparatus 11 outputs the downstream optical signal Sd-n by placing information on the wavelength of the upstream optical signal Su-n on a part of the frame. The information regarding the wavelength may be the wavelength itself or a symbol number corresponding to the wavelength.

  In this case, the worker uses the optical signal determination device 30 different from the optical signal determination device 20 described in FIG. 2 to perform the terminal device connection method described in the first embodiment. FIG. 3 is a block diagram illustrating the optical signal determination device 30 used here. A case will be described where the worker newly connects a terminal device to the optical fiber 16-x. The optical signal determination device 30 includes an information receiving circuit 31 that reads information on the wavelength of the upstream optical signal Su-x to the station device 11 included in the downstream optical signal Sd-x from the station device 11, and the information receiving circuit 31 includes And a determination circuit 32 that determines the wavelength of the upstream optical signal Su-x based on the read information. The optical signal determination device 30 may include a display circuit 26.

  The information receiving circuit 31 receives the downstream optical signal Sd-n, reads information regarding the wavelength included therein, and outputs the information to the determination circuit 32. The determination circuit 32 determines the wavelength of the upstream optical signal Su-n from the information regarding the wavelength, and outputs the wavelength to the display circuit 26 so as to display it. The display circuit 26 may display a numerical value or a symbol number corresponding to the wavelength. The display circuit 26 may turn on a lamp corresponding to the wavelength.

  The operator can connect the correct terminal device, that is, the terminal device 13-x that outputs the upstream optical signal Su-x, by looking at the wavelength or symbol number displayed on the display circuit 26.

  Further, as described in the first embodiment, the terminal device 13-x may have a structure in which a fixed wavelength light source can be replaced. In this case, the terminal device 13-x may include the optical signal determination device 30. FIG. 5 is a block diagram illustrating the terminal device 13-x. The light receiving circuit 42 that receives the downstream optical signal from the station device 11, the optical signal determination device 30, and the light source insertion unit 46 in which the fixed wavelength light source that outputs the upstream optical signal having the wavelength determined by the optical signal determination device 30 is incorporated. And an optical output circuit 43 that outputs the upstream optical signal Su-n to the station apparatus 11.

  When the terminal device 13-x includes the optical signal determination device 30, the worker connects the terminal device 13-x to the optical fiber 16-x, and the optical signal determination device 30 uses the downstream optical signal Sd−. an inspection procedure for inspecting x and determining the wavelength of the corresponding upstream optical signal Su-x, and a fixed wavelength light source that outputs the upstream optical signal Su-x having the wavelength determined in the inspection procedure toward the station apparatus 11 as a light source A fixed wavelength light source selection method including an assembling procedure to be incorporated into the insertion unit 46.

  The operator connects the terminal device 13-x to the optical fiber 16-x, and uses a light source insertion unit for a fixed wavelength light source corresponding to the wavelength, symbol number, or lit lamp displayed on the display circuit 26 of the terminal device 13-x. The connection work can be completed by inserting it into 46.

  In addition, as described with reference to FIG. 4, the fixed wavelength light source has a three-dimensional shape identification unit corresponding to the wavelength and symbol number, and the light source insertion unit 46 is configured to change the shape according to the wavelength of the downstream optical signal. You may have a department. An operator's work mistake can be prevented.

  As described above, Embodiment 1 and Embodiment 2 have been described. There are two methods for checking the terminal device connection method and the fixed wavelength light source selection method depending on the type of the wavelength division multiplexing optical transmission system.

  That is, when the wavelength division multiplexing optical transmission system is a type in which the information about the wavelength of the upstream optical signal is not included in the downstream optical signal, the inspection procedure is that the operator connects the optical signal determination device 20 to the optical fiber 16-x. After that, the wavelength measuring device 21 of the optical signal determination device 20 measures the wavelength of the downstream optical signal Sd-x from the station device 11, and the determination circuit 22 compares the wavelength of the downstream optical signal Sd-x with the correspondence table 24. The procedure is to determine the wavelength of the corresponding upstream optical signal Su-x.

  On the other hand, when the wavelength division multiplexing optical transmission system is a type in which the information about the wavelength of the upstream optical signal is included in the downstream optical signal, the inspection procedure is that the operator connects the optical signal determination device 30 to the optical fiber 16-x. After that, the information reception circuit 31 of the optical signal determination device 30 reads information on the wavelength of the upstream optical signal Su-x included in the downstream optical signal Sd-x, and the determination circuit 32 determines the upstream optical signal Su− based on the information. The procedure is to determine the wavelength of x.

11: Station device 12: Composite multiplexer / demultiplexers 13-1, 13-2, ..., 13-x, ..., 13-n: Terminal device 15: Optical fibers 16-1, 16-2, ..., 16-x, ..., 16-n: Optical fiber Sd-0: Wavelength multiplexed optical signal Su-0: Wavelength multiplexed optical signal Sd-1, Sd-2, ..., Sd-x, ..., Sd-n: Downstream optical signals Su-1, Su-2, ..., Su-x, ..., Su-n: Upstream optical signal 20: Optical signal determination device 21: Wavelength measuring device 22 : Determination circuit 24: correspondence table 26: display circuit 30: optical signal determination device 31: information reception circuit 32: determination circuit 41: filter 42: light receiving circuit 43: light output circuit 46: light source insertion unit

Claims (7)

A wavelength measuring device for measuring the wavelength of the downstream optical signal from the station device;
Correspondence table regarding wavelength of downstream optical signal and upstream optical signal to the station device,
A determination circuit that compares the wavelength of the downstream optical signal measured by the wavelength measuring device with the correspondence table and determines the wavelength of the corresponding upstream optical signal;
An optical signal determination device comprising: An information receiving circuit for reading information on the wavelength of the upstream optical signal to the station device, included in the downstream optical signal from the station device;
A determination circuit for determining a wavelength of an upstream optical signal based on the information read by the information receiving circuit;
An optical signal determination device comprising:   The optical signal determination apparatus according to claim 1, further comprising a display circuit that displays the wavelength of the upstream optical signal determined by the determination circuit. Wavelength division in which a downstream optical signal obtained by demultiplexing a wavelength multiplexed optical signal from a station apparatus is coupled to a plurality of terminal apparatuses, and an upstream optical signal from the terminal apparatus is combined to couple a wavelength multiplexed optical signal to the station apparatus A terminal device connection method for newly connecting a terminal device equipped with a fixed wavelength light source in a multiplex optical transmission system,
An inspection procedure for inspecting a downstream optical signal with the optical signal determination device according to any one of claims 1 to 3 and determining a wavelength of a corresponding upstream optical signal;
A connection procedure for connecting a terminal device that outputs an upstream optical signal having a wavelength determined in the inspection procedure to an optical fiber connected to the station device;
A terminal device connection method comprising: Wavelength division in which a downstream optical signal obtained by demultiplexing a wavelength multiplexed optical signal from a station apparatus is coupled to a plurality of terminal apparatuses, and an upstream optical signal from the terminal apparatus is combined to couple a wavelength multiplexed optical signal to the station apparatus A terminal device connection method for newly connecting a terminal device equipped with a fixed wavelength light source in a multiplex optical transmission system,
An inspection procedure for inspecting a downstream optical signal with the optical signal determination device according to claim 1 and determining a wavelength of a corresponding upstream optical signal;
A connection for connecting a terminal device incorporating the fixed wavelength light source to an optical fiber connected to the station device, incorporating a fixed wavelength light source that outputs an upstream optical signal having a wavelength determined in the inspection procedure into a newly connected terminal device Procedure and
A terminal device connection method comprising: A light receiving circuit for receiving a downstream optical signal from the station device;
An optical signal determination device according to any one of claims 1 to 3,
An optical output circuit that has a light source insertion portion in which a fixed wavelength light source that outputs an upstream optical signal having a wavelength determined by the optical signal determination device is incorporated, and that can output the upstream optical signal from the fixed wavelength light source toward the station device When,
A terminal device comprising: Wavelength division in which a downstream optical signal obtained by demultiplexing a wavelength multiplexed optical signal from a station apparatus is coupled to a plurality of terminal apparatuses, and an upstream optical signal from the terminal apparatus is combined to couple a wavelength multiplexed optical signal to the station apparatus A fixed wavelength light source mounting method of mounting a fixed wavelength light source on a terminal device newly connected in a multiplex type optical transmission system,
A connection procedure for connecting a terminal device comprising the optical signal determination device according to any one of claims 1 to 3 to an optical fiber connected to the station device;
Inspecting the downstream optical signal from the station device in the optical signal determination device, the inspection procedure for determining the wavelength of the corresponding upstream optical signal,
A built-in procedure for incorporating a fixed wavelength light source that outputs an upstream optical signal having a wavelength determined in the inspection procedure toward the station device, into a light source insertion unit;
A fixed wavelength light source selection method comprising:

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