Acousto-optic filter and optical CDMA system using the same

Inactive Publication Date: 2007-05-17
ELECTRONICS & TELECOMM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] The present invention also provides an optical CDMA system using an acousto-optic filter easily adjusting a channel depending on a variation in a frequency of an electric signal.

Problems solved by technology

Thus, the optical CDMA encoders and / or decoders have large volumes and complicated structures.

Method used

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  • Acousto-optic filter and optical CDMA system using the same
  • Acousto-optic filter and optical CDMA system using the same
  • Acousto-optic filter and optical CDMA system using the same

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Embodiment Construction

[0020] Hereinafter, an acousto-optic filter used for an optical CDMA encoder and / or decoder and an optical CDMA system according to the present invention will be described in detail with reference to the attached drawings.

[0021]FIG. 1 is a view illustrating an acousto-optic filter used for an optical CDMA encoder according to an embodiment of the present invention. Referring to FIG. 1, an acousto-optic filter 100 used for an optical CDMA encoder includes an acousto-optic mode converter (AOMC) 110 and a mode stripper (MS) 120.

[0022] If light input to the AOMC 110 is a fundamental mode or a first mode having a light frequency and a frequency of an electric signal input to the AOMC 110 is f1, the AOMC 110 outputs a second mode having a light frequency of ω1+f1.

[0023] Since the frequency f1, is very smaller than a frequency ω1, an electric frequency component f1 hardly affects a variation in the light frequency ω1. The AOMC 110 and the MS 120 are connected to each other through a dua...

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Abstract

Provided are an acousto-optic filter and an optical code division multiple access (CDMA) system using the acousto-optic filter. The acousto-optic filter includes: an acousto-optic mode converter (AOMC) converting an optical signal of a specific optical frequency corresponding to a frequency of an electric signal of an optical signal of a first mode having a predetermined optical frequency band; and a mode stripper (MS) stripping an optical signal of the optical signal of the first mode that has been converted to a second mode.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION [0001] This application claims the benefit of Korean Patent Application No. 10-2005-0110359, filed on Nov. 17, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an optical code division multiple access (CDMA) encoder and / or decoder, and more particularly, to an acousto-optic filter used for an optical CDMA decoder and / or encoder and an optical CDMA system using the same. [0004] 2. Description of the Related Art [0005] Conventional wavelength domain optical CDMA encoders and / or decoders mainly include fiber Bragg gratings (FBGs) or general diffraction gratings. [0006] Optical CDMA encoders and / or decoders using general diffraction gratings divide light according to a wavelength using the general diffraction gratings, transmit or reflect optical signals having spec...

Claims

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Application Information

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IPC IPC(8): H04J14/00H04B10/2581
CPCH04J14/005H04B10/2581H04B10/516G02B5/20
InventorKIM, BONG KYUPARK, SANG JOPARK, HEUKKIM, KWANG JOON
OwnerELECTRONICS & TELECOMM RES INST