Optical communication system using optical frequency code, optical transmission device and optical reception device thereof, and reflection type optical communication device

An optical communication system and optical coding technology, applied in the field of optical communication systems, can solve problems such as deterioration of communication quality and poor extinction ratio of downlink optical signals, and achieve the effect of rough control accuracy and easy realization
CN1813429AInactive Publication Date: 2006-08-02NIPPON TELEGRAPH & TELEPHONE CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NIPPON TELEGRAPH & TELEPHONE CORP
Publication Date
2006-08-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The correction of the light frequency of a light source may not be needed, a transmission belt is not increased, but a plurality codes are used. The light frequency width of the light source is set to be FSR and the code length of all codes are set to be FSR and is enabled to be provided with the orthogonality. Each light intensity frequency characteristic of an nth optical coded signal is set to be Cn(f)=[1+cos(2pion sf / FSR+r pion / 2) / 2(s is an integer of 1-the maximum code / 2, r=0or1)], the orthogonality is given between the optical encoding signal, or continuous light frequency code chips are distributed to the arrangement of code chips which form the optical encoding signal in turn, the light frequency of each code chip '1'is output, and codes such as a Hadamard code word (0101) and (0011) of a repeated second order and a filter with optical filter characteristics of a connecting code which connects the Hadamard code word are used to enable light source light to obtain the optical optical encoding signal. A coding light frequency region (31) and a decoding light frequency region (32) are covered on a drifting region of light source frequency. Delta F1and Delta F2 in the graph 13 are drifts of the light source frequency.
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Description

technical field

[0001] The present invention relates to optical code division multiplexing (OCDM, Optical Code Division Multiplex), four-phase modulation (QPSK, QUADRATURE Phase Shift Keying) that can separate and multiplex multiple data sequences of the present invention by different optical codes, or convert positive Quadrature Amplitude Modulation (QAM, Quadrature Amplitude Modulation) technology is applied to an optical communication system of optical communication, an optical communication device, a light receiving device, and a reflective optical communication device used in the system. Background technique

[0002] Regarding the one-to-many transmission on the PON (Passive Optical Network) that connects multiple local offices to the central office (central office) via optical fibers, the following scheme has been proposed: Allocate the local offices of each coverage office to each other in an orthogonal relationship. Virtual random diffusion code, the coverage office ...

Claims

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