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Optical transmission system with gain control for reducing spurious signal components

An optical transmission and signal technology, applied in the fields of receivers, optical transmission systems and transmitters, which can solve problems such as difficulty in approaching and reducing false components

Inactive Publication Date: 2005-11-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, it is difficult to approach and reduce spurious components where the modulation method changes over time

Method used

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  • Optical transmission system with gain control for reducing spurious signal components
  • Optical transmission system with gain control for reducing spurious signal components
  • Optical transmission system with gain control for reducing spurious signal components

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0070] FIG. 1 is a block diagram illustrating the structure of an optical transmission system according to a first embodiment of the present invention. In FIG. 1, the optical transmission system includes a transmitter 11, a first optical transmission path 108, a receiver 12, first to nth subscriber lines 111-1 to 111-n, and first to nth demodulation sections (terminal devices) 112-1 to 112-n. Here, we assume that n is an integer greater than or equal to 2.

[0071] The transmitter 11 is connected to the receiver 12 through the first optical transmission path 108 . For example, transmitter 11 may be installed at a central office (CO) of a telephone company or the like.

[0072] Receiver 12 may, for example, be installed in a common part of a multi-dwelling unit (MDU). The receiver 12 is connected to the first to nth demodulation sections 112-1 to 112-n through subscriber lines (first to nth subscriber lines 111-1 to 111-n), respectively.

[0073] Subscriber lines 111-1 to 1...

no. 2 example

[0148] Fig. 13 is a block diagram illustrating the structure of an optical transmission system according to a second embodiment of the present invention. In FIG. 13, the optical transmission system includes a transmitter 11a, a first optical transmission path 108, a second transmission path 108a, a receiver 12a, first to nth subscriber lines 111-1 to 111-n, and first to nth n demodulation sections (terminal devices) 112-1 to 112-n. The transmitter 11a includes a line separation section 101, first to nth modulation sections 102-1 to 102-n, a frequency division multiplexing section 103, a gain adjustment section 106a, a photoelectric conversion section 107, a peak detection section 104, and pseudo Calculation part 105. The receiver 12 a includes a photoelectric conversion section 109 , a frequency demultiplexing section 110 , a distortion monitoring section 113 , and a distortion information transmission section 114 .

[0149] The receiver 12a according to the second embodimen...

no. 3 example

[0158] Fig. 15 is a block diagram illustrating the structure of an optical transmission system according to a third embodiment of the present invention. In FIG. 15, the optical transmission system includes a transmitter 11b, a first optical transmission path 108, a second optical transmission path 108a, a receiver 12b, first to nth subscriber lines 111-1 to 111-n, and first to nth demodulation sections 112-1 to 112-n, and first to nth quality detection sections 115-1 to 115-n. The transmitter 11b includes a line separation section 101, first to nth modulation sections 102-1 to 102-n, a frequency division multiplexing section 103, a gain adjustment section 106b, a photoelectric conversion section 107, a peak detection section 104, and pseudo Calculation part 105. The receiver 12 b includes a photoelectric conversion section 109 , a frequency demultiplexing section 110 , and a quality information transmission section 116 .

[0159] The receiver 12b according to the third embod...

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Abstract

In a transmitter (11), a peak detection section (104) detects a peak factor of a frequency division multiplexed signal which is output from a frequency division multiplex section (103). A spurious calculation section (105) instructs a gain adjustment section (106) to adjust the signal level of the frequency division multiplexed signal so that the level of spurious components (e.g., adjacent channel leakage power ratio (ACLR)) is equal to or less than a predetermined level, based on the peak factor.

Description

technical field [0001] The present invention relates to an optical transmission system, a transmitter, a receiver, and related methods of use. The invention relates in particular to an optical transmission system compatible with Subscriber Line (DSL: Digital Subscriber Line), an optical transmission system for CATV, or an optical transmission system for wireless signals, a system called ROF (Radio Over Fiber) , and transmitters, receivers, and related methods of use. Background technique [0002] Fig. 19 is a block diagram of a conventional optical transmission system. In FIG. 19, a conventional optical transmission system includes a multiplexing section 81, an optical modulation section 82, an optical transmission path 83, an optical detection section 84, a demultiplexing section 85, first to nth basic modulation sections 86 -1 to 86-n, first to nth electrical transmission paths 87-1 to 87-n, and first to nth demodulation sections 88-1 to 88-n. Note that the first to nth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/2581H04J14/02H04L27/26
CPCH04B10/564H04L27/2626H04B10/503H04J14/0298H04L27/26265H04B10/2507H04B10/2581H04J14/02
Inventor 安江敏彦布施優
Owner PANASONIC CORP
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