JP2003008601A - Optical communications system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a new and simplified communications business that does not require co-location of optical transmission facilities within a provider's station. SOLUTION: A telecommunications company makes co-location of only racks of optical splitters or jumpers or the like within the provider's station, while installing in it's own building the OLTs(Optical Line Terminal) and the transmission devices for relay channels formerly required co-location. In addition, dark fibers are used to connect the OLTs with the ONU(Optical Network Unit) of each user.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in optical transmission equipment of a user side optical fiber cable provider. In particular,
It is used when a telecommunications carrier co-locates the optical transmission equipment of a user side optical fiber cable provider.

[0002]

2. Description of the Related Art An example of a conventional optical communication system of a user side optical fiber cable provider is shown in FIGS.
Will be described with reference to. FIG. 6 is an overall configuration diagram of a conventional optical communication system. FIG. 7 is a block diagram of a conventional optical communication system. In both figures, 1 is a user building, 11 is a station of a user side optical fiber cable provider (hereinafter simply referred to as provider), 12 is an optical fiber cable connecting the user building 1 and the provider's station 11. 13 is a relay line,
21 is an OLT (O) which is an optical transmission facility accommodating a plurality of users.
vertical line terminal), 22 is a rack for connecting optical cables inside and outside the station, and 23 is an ONU which is an optical transmission facility for each user.
(Optical Network Unit), 24 is an optical fiber cable 1
The unused optical fiber cable in 2 is a dark fiber, 25 is an optical splitter, and 26 is an OLT2.
Intra-station optical fiber cable connecting 1 and the optical splitter 25,
Reference numeral 41 is a transmission device for the relay line, and 101 is an external device for supplying power to the OLT 21 and adjusting temperature and humidity.

[0003] The telecommunications carrier can expand the network scale by adding the station 11 of the servicing provider, and thereby can earn a profit from the servicing provider. Also,
The provider can provide the user with the user-side optical fiber cable 12 in cooperation with the carrier, and can also make a profit from the user by relaying the service provided by the carrier to the user.

With the above configuration, the OLT 21, the optical splitter 25, and the transmission device 41 for the trunk line 13 are owned by the telecommunications carrier and colocated at the station 11 of the provider. Further, the ONU 23 is owned by a telecommunications carrier or sold to a user. The telecommunications carrier provides communication services to each user by connecting these optical transmission facilities and the dark fiber of the provider. On the other hand, the provider is the OLT 21 and the optical splitter 2 to be colocated.
5 and the transmission device 41, a space and a facility environment such as power supply and air conditioning are provided.

[0005]

With such a configuration, the telecommunications carrier may not be able to install the station 11 of the provider, and the external device 101 may not have sufficient performance. Has a problem that it is difficult to freely select, change or modify the device to be colocated. As a result, it is not possible to flexibly add or change services or expand users, which may hinder business development.

[0006] The present invention has been made against such a background, and a telecommunications carrier uses a dark fiber provided by a service provider and establishes a collocation of a station of the service provider. The optical fiber line can be constructed directly with the user in a form limited to the optical fiber connection described above, and there is no need to co-locate the optical transmission equipment to the station of the provider, so the equipment can be freely selected, installed, and changed. Moreover, the number of optical fibers that can be installed in a user's building is limited, and it is difficult to add more. However, by using wavelength multiplexing technology, various communication can be performed with the minimum number of optical fibers. An object is to provide an optical communication system capable of providing a service. An object of the present invention is to provide an optical communication system capable of easily developing a new communication business without having to co-locate the optical transmission equipment to the station of the provider.

[0007]

In the optical communication system of the present invention, the telecommunications carrier collocated only the optical splitter or the jumper or the rack equipped with these to the station of the provider, and conventionally, the collocation is The required transmission equipment for OLT and trunk lines will be installed in the company's building. Furthermore, the communication system is configured by connecting the OLT and the ONU of each user using a dark fiber.

As a result, the telecommunications carrier can provide the telecommunications service to the user and develop the telecommunications business, regardless of the colocation conditions such as the space of the office of the provider, the air conditioning and the power supply capacity.

That is, according to the present invention, a plurality of user side optical fiber cables respectively connected to a plurality of users' optical transmission equipments, an OLT accommodating the plurality of user side optical fiber cables, the OLT and the user side. It is an optical communication system including a frame inserted between an optical fiber cable and a transmission device that connects the OLT and a relay line.

Here, a feature of the present invention is that the OLT and the transmission device are provided on the side of a communication carrier,
The rack is provided on the provider side of the user side optical fiber cable, and a carrier side optical fiber cable that connects the OLT on the communication carrier side and the rack on the provider side is provided. Where it is. Further, the OL
An external device for supplying power to T and adjusting temperature and humidity can also be installed on the telecommunications carrier side.

The rack may be provided with an optical splitter, and the OLT and the plurality of user side optical fiber cables may be connected one-to-many via the carrier side optical fiber cable and the rack. Alternatively, a jumper is provided on the rack, and the optical fiber cable from the OLT is used as a starting point via the carrier-side optical fiber cable and the user-side optical fiber cable to pass through the rack and the optical transmission facilities of the plurality of users. A loop for returning to the OLT may be formed.

[0012] As a result, the telecommunications carrier uses the dark fiber provided by the telecommunications carrier, and the collocation of the station of the telecommunications carrier is limited to the optical fiber connection on the rack to directly connect the optical fiber to the user. Fiber tracks can be constructed. Further, since it is not necessary to co-locate the optical transmission equipment at the station of the provider, the equipment can be freely selected, installed and changed. Further, although the number of optical fibers drawn into the user's building is limited and it is difficult to add more, it is possible to provide various communication services with the minimum number of optical fibers by using the wavelength multiplexing technology. With this, it is not necessary to co-locate the optical transmission equipment to the station of the provider, and a new communication business can be easily developed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical communication system according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of an optical communication system of the present invention. FIG. 2 is a block diagram of the optical communication system according to the first embodiment of the present invention. FIG. 3 is a diagram showing a wavelength-multiplexed optical transmission line according to the first embodiment of the present invention. FIG. 4 is a diagram showing an optical transmission line of the optical communication system of the second embodiment of the present invention. FIG. 5 is a diagram showing a wavelength-division multiplexed optical transmission line of a second embodiment of the present invention.

The present invention, as shown in FIG. 1 and FIG.
A dark fiber 24, which is a plurality of user-side optical fiber cables, respectively connected to the ONUs 23 of the optical transmission equipment of the plurality of user buildings 1, and the plurality of dark fibers 24.
An OLT 21 that accommodates the OLT 21, a rack 22 that is interposed between the OLT 21 and the dark fiber 24, an external device 101 that supplies power to the OLT 21 and adjusts the temperature and humidity, and the OLT.
21 is an optical communication system including a transmission device 41 that connects 21 and the trunk line 13.

Here, the feature of the present invention is that O
The LT 21, the external device 101, and the transmission device 41 are provided in the station 20 on the telecommunications carrier side, and the rack 22 includes the dark fiber 2
4 is provided in the provider side station 11 and a dark fiber 124 which is a carrier side optical fiber cable for connecting the OLT 21 of the communication carrier side station 20 and the rack 22 of the provider side station 11 is provided. It is in the place where it was given.

In the first embodiment, as shown in FIG.
An optical splitter 25 is provided at 2, and the OLT 21 and the plurality of dark fibers 24 are connected one-to-many via the dark fibers 124 and the frame 22.

In the second embodiment, as shown in FIG.
2, a jumper 27 is provided, and a dark fiber 24
Starting from the OLT 31 via the OLT 31 and the ONU 32 of the optical transmission equipment of a plurality of users via the OLT 31
A loop for returning to the LT 31 is formed.

In the optical communication system of the embodiment of the present invention, the telecommunications carrier collocated only the optical splitter 25 or the jumper 27 to the station 11 of the provider, and the OLT 21 and the trunk line for which the collocation has been conventionally required are used. The transmission device 41 is installed in the station 20 of the telecommunications carrier. Furthermore, using the dark fiber 24, the OLT 21 and the O of each user are
A communication system is configured by connecting to the NU 23. As a result, the new telecommunications carrier can provide the telecommunications service to the user and execute the telecommunications business regardless of the collocation conditions such as the space of the station 11 of the provider and the air conditioning and the power supply capacity.

(First Embodiment) The first embodiment of the present invention is shown in FIGS.
This will be described with reference to FIG. In FIG. 3, in order to express the characteristics of the optical transmission equipment using wavelength division multiplexing described as the first embodiment, the OL related to wavelength division multiplexing from the block configuration diagram of FIG.
Only T21, ONU 23, optical splitter 25 and dark fibers 24 and 124 are shown. The optical splitter 25 is wavelength-dependent, and λ1 to λ4 have different wavelengths. λ1 is a wavelength used for transmission between all ONUs 23 and OLT 21, and λ2, λ3, and λ4 are wavelengths that limit users (ONUs), respectively. Further, the OLT 21 and the ONU 23 have a wavelength multiplexing function.

The communication services provided by each wavelength are:
λ1 corresponds to public communication service, and λ2 to λ4 correspond to leased line service. As described above, by using the wavelength multiplexing technique, the communication carrier can provide the advanced communication business with at least one dark fiber for each location.

In FIG. 3, the light of wavelengths λ2 to λ4 is described as being connected one-on-one to the equal ONU 23, but the light of wavelengths λ2 to λ4 emitted from the OLT 21 is actually It is distributed to all ONUs 23 by the optical splitter 25. Therefore, the wavelength λ2 corresponding to each ONU 23
˜λ4 is identified. As another method, a wavelength identification function is added to the optical splitter 25 so that each ONU 2 can be
It is also possible to allocate the wavelengths λ2 to λ4 corresponding to 3 to the respective dark fibers.

The one-to-many communication system using wavelength division multiplexing used in this embodiment has already been an optical PDS (Passive Double Sta).
r) This is a well-known technology as a system, but various products are emerging in recent years, and it is expected that the equipment will be expanded or changed in the future. Also in that case, since it is not necessary to change the collocation condition of the station of the dark fiber provider, the telecommunications carrier can freely change the equipment.

(Second Embodiment) An optical communication system according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. The second embodiment is a loop between each user and the communication carrier,
It is equipped with a route for normal service and a route for bypassing in the event of an abnormality. It is also possible to use both routes separately depending on the directions of the business operator → user and the user → business operator. 31 is a loop OLT, 32 is a loop ONU, 27 is a jumper that connects the dark fibers 24 and 124 one by one, and 51, 52 and 53 are wavelengths λ1 and λ2, respectively.
And an optical transceiver for λ3.

With the configuration of FIG. 4, the OLT 31 and each ONU
A dark fiber 32 forms a loop via the station 11 of the dark fiber provider. In FIG.
λ1 is a wavelength used for transmission between all the ONUs 32 and the OLT 31, and λ2 and λ3 are wavelengths that limit users (ONUs). As communication services provided at each wavelength, λ1 corresponds to public communication service, and λ2 and λ3 correspond to leased line service. As described above, by using the wavelength multiplexing technique, a new telecommunications carrier can provide a highly reliable telecommunications business with at least two dark fibers for each location.

Although the communication system of the loop structure using wavelength division multiplexing used in this embodiment is a technique already known as an optical ring system, various products have been emerging in recent years, and facilities and upgrades will be made in the future. is expected. Also in that case, it is not necessary to change the collocation condition of the station of the dark fiber provider, so that the new carrier can freely change the equipment.

[0026]

As described above, according to the present invention,
The telecommunications carrier constructs the optical fiber line directly with the user by using the dark fiber provided by the service provider and limiting the collocation of the station of the service provider to the optical fiber connection on the rack. be able to. Further, since it is not necessary to co-locate the optical transmission equipment at the station of the provider, the equipment can be freely selected, installed and changed. Further, although the number of optical fibers drawn into the user's building is limited and it is difficult to add more, it is possible to provide various communication services with the minimum number of optical fibers by using the wavelength multiplexing technology. With this, it is not necessary to co-locate the optical transmission equipment to the station of the provider, and a new communication business can be easily developed.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an optical communication system of the present invention.

FIG. 2 is a block configuration diagram of an optical communication system according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a wavelength-multiplexed optical transmission line according to the first embodiment of the present invention.

FIG. 4 is a diagram showing an optical transmission line of an optical communication system according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a wavelength-multiplexed optical transmission line of a second embodiment of the present invention.

FIG. 6 is an overall configuration diagram of a conventional optical communication system.

FIG. 7 is a block configuration diagram of a conventional optical communication system.

[Explanation of symbols]

1 user building 11, 20 stations 12, 26, 112 Fiber Optic Cable 13 trunk lines 21, 31 OLT 22 racks 23, 32 ONU 24, 124 dark fiber 25 optical splitter 27 jumpers 41 Transmission device 51, 52, 53 Optical transceiver 101 External device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masanori Kondo             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Toru Ogawa             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 5K002 DA09 DA11 DA12 FA01                 5K033 AA04 AA09 DB01 DB22                 5K069 AA13 BA09 CB10 DA02

Claims (3)

[Claims] 1. A plurality of user-side optical fiber cables respectively connected to optical transmission equipments of a plurality of users, and an OL accommodating the plurality of user-side optical fiber cables.
An optical communication system comprising a T (Optical Line Terminal), a rack inserted between the OLT and the user-side optical fiber cable, and a transmission device that connects the OLT and a trunk line, , The transmission device is provided on a telecommunications carrier side, the rack is provided on a provider side of the user side optical fiber cable, the OLT on the telecommunications carrier side and the rack on the provider side An optical communication system, characterized in that a carrier-side optical fiber cable for connecting to and is provided. 2. An optical splitter is provided on the rack, and the OLT and the plurality of user-side optical fiber cables are connected one-to-many via the operator-side optical fiber cable and the rack. The optical communication system according to item 1. 3. A jumper is provided on the rack, and the jumper and the optical transmission facilities of the plurality of users are used as a starting point from the OLT via the operator-side optical fiber cable and the user-side optical fiber cable. Then the above O
The optical communication system according to claim 1, wherein a loop for returning to the LT is formed.