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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 frequency technology, which is 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

Inactive Publication Date: 2011-09-21
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the following problem arises: the wavelength of the transmitted optical signal and the selected wavelength 31 of the encoder 11 are notified from the receiving end to the transmitting end, and the transmitting end must correct the outgoing light 20 of the light source 10 and the selected wavelength 31 of the encoder 11 based on the notification.
Therefore, the extinction ratio of the downlink optical signal is poor, and the communication quality deteriorates

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0120] Figure 4 It represents Embodiment 1-1 of applying the principle of the first working mode of the present invention to a single-channel communication system. This embodiment 1-1 is the same as the existing optical communication system, has a light source 10, an encoder 11, a decoder 12, an optical transmission path (optical fiber) 13, and furthermore, includes a dispersion compensator 17 in this embodiment 1-1, Since the frequency-dependent propagation delay time differs due to the frequency dispersion of the optical transmission path, average compensation is performed so that the delay time between transmission and reception of each frequency component constituting the optical coded signal is the same. The optical frequency region to be compensated by the dispersion compensator 17 is at least wider than the optical frequency region used as the optical code signal.

[0121] The light source 10 outputs at least an optical signal of an optical bandwidth FSR corresponding ...

Embodiment 1-2

[0142] Embodiment 1-2 of the first operation mode is a concrete embodiment of Embodiment 1-1, and is an example in which a trigonometric function is used as the encoding function C(f). In the present embodiment 1-2, use the value of a as small as possible (positive integer), and under the situation that r ' codes are generated with the same value of a, a takes from 1 to the maximum number of codes (maximum coverage encoder Number) N divided by 2 is an integer value of N / 2, when r is 0 or 1 which is a remainder of 2, the n-th optically encoded signal Cn(f) is represented by the following formula.

[0143] Cn(f)=(1+cos(2·π·a·f / FCL+r·π / 2)) / 2 (7)

[0144] The optically encoded signal function value Cn(f) is a value from 0 to 1, and the encoder 11 n The integral value of the interval of any light source light bandwidth FSR (FSR=FCL in this example) in the encoding object is FCL / 2, encoder 11 n In the optical frequency region to be coded, the light transmission characteristic repe...

Embodiment 1-3

[0170] Embodiments 1-3 of the first working mode take 1 or 0 as the intensity of the chip of each optical frequency component constituting the optical coded signal. Configuration examples and Figure 4 Same as shown.

[0171] By the encoder 11 in this embodiment 1-3 n The generated optical coded signals are the same as in Embodiments 1-1 and 1-2, and the code lengths of the first to Nth optical coded signals are the same length FCL, and they are orthogonal to each other. Such an optically encoded signal also has the following properties. Randomly select the number of chips of "1" and the code of "-1" in the chip column of continuous code length FCL chips from the concatenated codes connected by the encoded code Cn(f) of the continuous repetition code length FCL The number of slices is equalized (the same number), and the code length FCL is randomly selected from the mutually different concatenated codes generated from mutually different encoded codes, respectively, between t...

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Abstract

The invention dispenses with calibration of the optical frequency of the light source and permits the use of many codes without increasing the transmission bandwidth used. The optical frequency width of the light source is represented by FSR and the code length of every code is represented by FSR, the codes are made to be orthogonal to each other. The optical intensity-frequency characteristic of an n-th optical code signal is set to Cn(f)=(1+cos(2pisf / FSR+rpi / 2)) / 2 (where s is an integer in the range from 1 to maximum number of codes / 2, and r=0 or 1) to provide orthogonality between the optical code signals.; Alternatively, optical frequency chips are sequentially assigned to chip sequences forming the optical code signals, the optical frequency of each chip "1" is output, and a filter is provided with an optical filtering characteristic of a concatenated code which is a repeated continuation of, for example a second-order Hadamard code word (0101) or (0011), and light emitted from the light source is passed through the filter to form the optical code signal. An encoding optical frequency region 31 and a decoding optical frequency region (32) are so chosen as to cover a range of drift of the source frequency. In FIG. 13, DeltaF1 and DeltaF2 indicate drifts of the source frequency.

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), or 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 modulates the optical signal according to the assigned diffusion code, and then sends the optical modulation signal to the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/155H04J14/00H04B10/516H04B10/272H04B10/54H04B10/556H04B10/61H04J14/02H04J14/04H04J14/06
CPCH04B10/548H04J14/007H04J14/02
Inventor 吉野学三鬼准基
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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