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Optical transmission equipment, optical transmission system and optical terminal station

一种光传输、终端站的技术，应用在光波分复用网络领域，能够解决开关尺度大等问题

Inactive Publication Date: 2008-11-26
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the scale of the switch will be large, which is not desirable when considering the reduction of the equipment size of the OADM system

Method used

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  • Optical transmission equipment, optical transmission system and optical terminal station
  • Optical transmission equipment, optical transmission system and optical terminal station
  • Optical transmission equipment, optical transmission system and optical terminal station

Examples

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Embodiment Construction

[0089] The preferred embodiment is described below.

[0090] Figure 2 shows the basic principle of the OADM device using AOTF.

[0091] In FIG. 2, wavelength multiplexed optical signals having wavelengths λ1 to λn are input into AOTF 10, and 8 waves are added and dropped at the same time. Obviously, the number of wavelengths to be added or dropped is not limited to this value.

[0092] The optical wavelength is selected by the AOTF 10 by applying a corresponding RF signal (electrical signal) to the wavelength to be dropped. In FIG. 2 , wavelength-multiplexed optical signals having wavelengths of λ1 to λn are input to the AOTF 10 . Eight RF signals having frequencies f1 to fn corresponding to wavelengths λ1 to λn are applied to the AOTF 10 .

[0093] An optical signal having a wavelength corresponding to the frequency of the RF signal applied to the AOTF 10 is output to the branch port of the AOTF 10 . It is amplified by the optical amplifier 20 and then input into the 8×1 ...

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Abstract

In an OADM system, an OADM device includes an AOTF. The AOTF can select an optional wavelength by changing the frequency of an RF signal to be applied. An optical signal having a specified wavelength can be dropped from a wavelength-multiplexed optical signal input from an input terminal, or a wavelength-multiplexed optical signal input from an add port can be multiplexed with a through optical signal. However, considering the increase in coherent cross talk, the AOTF should be exclusively used for dropping in an actual device configuration. Otherwise, a drop optical signal is branched by an optical coupler with the wavelength selected by a tributary station. Thus, the wavelength selected by the tributary station can be extracted by the AOTF from the through optical signal.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of March 31, 1999, an application number of 200510005942X, and a title of "Optical Transmission Equipment, Optical Transmission System, and Optical Terminal Station". The above-mentioned Chinese patent application with the application number 200510005942X is still a divisional application of the Chinese patent application with the application date of March 31, 1999, the application number 99104533.5, and the title "Optical Transmission Equipment, Optical Transmission System, and Optical Terminal Station". technical field [0002] The invention relates to an optical wavelength division multiplexing network. Background technique [0003] For the future multimedia network, the research and development of the ultra-long and large-capacity optical communication system required by it and the optical wave network using this system are now being actively carried out. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02G02F1/11H04B10/07H04B10/27H04B10/29H04J14/00
CPCH04J14/0213H04J14/0294H04J14/0283H04J14/0289H04J14/0212H04J14/0297H04J14/0206H04J14/0209H04J14/0219H04J14/0205H04J14/0291H04J14/021H04J14/0204
Inventor 尾中宽宫田英之大冢和惠甲斐雄高中泽忠雄近间辉美
Owner FUJITSU LTD