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Optical transmission device and optical transmission system

An optical transmission and optical transmission line technology, applied in transmission systems, electromagnetic wave transmission systems, optical fiber transmission, etc., can solve the problem of reducing the modulation frequency of lasers, and achieve the effect of good optical transmission characteristics

Inactive Publication Date: 2007-03-14
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such systems, it is therefore possible to reduce the modulation frequency of the laser

Method used

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  • Optical transmission device and optical transmission system
  • Optical transmission device and optical transmission system
  • Optical transmission device and optical transmission system

Examples

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no. 1 example

[0048] FIG. 1 is a schematic configuration diagram showing an optical transmission system according to a first embodiment of the present invention. This optical transmission system includes an optical transmitting device A and a receiving device B. The optical transmitting apparatus A has a signal source 1, a first electrical transmission line 2A, a first frequency converting device 3, and a semiconductor laser 4 serving as an electrical-optical converter (hereinafter referred to as an E / O converter). The receiving device B has an optical fiber transmission line 5 , a photodiode 6 serving as an optical-electrical converter (hereinafter referred to as an O / E converter), a second electrical transmission line 2B, and a second frequency conversion device 7 .

[0049] Among them, the first frequency converting device 3 provided on the side of the optical transmitting apparatus A converts the frequency band of the electric signal transmitted from the signal source 1 into an intermed...

no. 2 example

[0065] Next, description will be made regarding an optical transmission system according to a second embodiment of the present invention. In this embodiment, the same parts as those in the first embodiment are referred to accordingly, and redundant description thereof will be avoided.

[0066] FIG. 7 is a schematic configuration diagram showing an optical transmission system according to this embodiment. In the optical transmission device of this optical transmission system, unlike in the first embodiment, the frequency band of the electric signal transmitted from the signal source 1 is converted by the first frequency conversion device 3 into a predetermined frequency band higher than the frequency band. In this embodiment, in the same manner as in the first embodiment, a semiconductor laser based on single-mode oscillation is used as the semiconductor laser 4, serving as an electro-optical converter.

[0067] Here, in the optical transmitting apparatus according to this emb...

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Abstract

An object of the invention is to clear up factors in deterioration due to optical reflection and to provide an optical transmission apparatus and an optical transmission system in which a superior optical transmission characteristic can be obtained for analog signals even if a reflection phenomenon occurs in an optical transmission line. There are provided a frequency converter (3) for converting the frequency band of a to-be-transmitted electric signal into a predetermined frequency band higher that this frequency band, and a semiconductor laser (4) serving as an electro-optic converter for performing electro-optic conversion upon the frequency-converted electric signal.

Description

technical field [0001] The present invention relates to an optical transmission device for optically transmitting an analog signal such as a video signal or a mobile radio communication signal by using an optical transmission line, and to an optical transmission system having the optical transmission device. Background technique [0002] When an analog signal such as a video signal or a mobile radio communication signal is transmitted through an optical transmission line such as an optical fiber, a direct modulation system using a semiconductor laser to perform direct modulation or an external modulation system using an external modulator is known as the A method of converting electrical signals into optical signals. [0003] It can be considered that the distortion characteristics after optical transmission and the stability of CNR (carrier-to-noise ratio) are technical issues in optical analog transmission. For example, in electro-optical conversion using a direct modulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/02H04B10/00H04B10/18H04B10/2507H04B10/2575H04B10/54
CPCH04B10/2575
Inventor 尾田胜哉东乡仁麿佐藤吉保浅野弘明
Owner PANASONIC CORP