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Optical access network system

A technology of network system and optical terminal, applied in the field of optical access network system, can solve the problem of difficult to obtain digital multiplier of A/D converter, etc.

Inactive Publication Date: 2007-08-08
OKI ELECTRIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, it is difficult to obtain A / D converters and digital multipliers capable of operating at such high speeds

Method used

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no. 1 example

[0037] The configuration and operation of the optical access network system of the first embodiment will be described with reference to FIG. 1 . FIG. 1 is a schematic block configuration diagram showing an optical access network system according to a first embodiment. The optical access network system shown in FIG. 1 assumes that the number of subscribers (number of users) is 4, that is, there are 4 optical terminal devices. However, although there are 4, the following descriptions will be the same no matter how many there are. established. In FIG. 1 , in order to identify a plurality of optical terminal devices, the optical terminal device to which the first channel is allocated is represented as ONU-1, and the optical terminal device to which the fourth channel is allocated is represented as ONU-4. All of ONU-1 to ONU-4 have the same structure. In the subsequent description of the optical access network system of the first embodiment, when describing the configuration of a...

no. 2 example

[0143]The configuration and operation of the optical access network system of the second embodiment will be described with reference to FIG. 8 . Fig. 8 is a schematic block diagram of the optical access network system of the second embodiment. In the second embodiment, a case where the number of subscribers is 16 is assumed. The difference from the optical access network system of the first embodiment is that in the optical access network system of the first embodiment, only one signal wavelength is used for communication, while in the optical access network system of the second embodiment In the network system, there is a so-called WDM (Wavelength Division Multiplex) system using four wavelengths as signal wavelengths.

[0144] Thus, relative to the signal wavelength λ 1 The structure of the communicating part is the same as that of the optical access network system of the first embodiment. The wavelength used as the wavelength of the signal uses λ 1 to lambda 4 There ar...

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Abstract

An optical access network system capable of transmitting and receiving high-speed signals and which allows the number of subscribers to be increased without increasing the number of wavelengths used is provided. An optical line terminal and an optical network unit are joined via an optical fiber transmitting line, a star coupler, and a plurality of branching optical fiber transmitting lines. The optical line terminal and optical network unit are constituted comprising an optical processing section and an electrical processing section. The optical processing section comprises a light-emitting element and a light-receiving element. The electrical processing section comprises a transmitting signal processing section that generates an encoded transmitting signal in the form of an electrical signal by encoding a transmitting signal and a receiving signal processing section that obtains a receiving signal by decoding a code-division-multiplexed signal that has been converted from optical-signal form to electrical-signal form by the light-receiving element. The optical access network system is characterized in that the decoding processing circuit that the receiving signal processing section comprises is constituted comprising an analog matched filter and a decision circuit.

Description

technical field [0001] The present invention relates to an optical access network system used for communication between a service provider and a subscriber in a PON (Passive Optical Network, Passive Optical Network) by means of Code Division Multiplexing (CDM: Code Division Multiplexing). Background technique [0002] Attention is being paid to an optical access network system configured by connecting a service provider (hereinafter also referred to as a 'center') and a plurality of subscribers (hereinafter also referred to as a 'user') via a PON. In the following description, the device on the service provider side is sometimes called an optical line terminal device or OLT (Optical Line Terminal, optical line terminal), and the device on the subscriber side is sometimes called an optical terminal device or an ONU (Optical Network Unit). , optical network unit). [0003] PON is a network in which an optical splitter as a passive component is connected in the middle of an op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/00H04B10/20H04B10/27H04B10/272
Inventor 鹿岛正幸岩村英志
Owner OKI ELECTRIC IND CO LTD
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