发明名称 |
DYNAMIC GAIN EQUALIZER FOR OPTICAL AMPLIFIERS |
摘要 |
An optical equalizer for use primarily with an erbium-doped fiber amplifier has an initial polarizer that convert Th. input beam to a predetermined polarization, followed by a series of dynamically-adjustable sinusoidal filters that provide attenuation as a sinusoidal function of beam wavelength. Each of the sinusoidal filters has a first liquid crystal cell adjustably rotating the polarization of the beam from the preceding polarizer. This is followed by a second optical element that retards the beam as sinusoidal function of beam wavelength. For example, the second optical element can be birefringent crystal that provided a fixed degree of retardance to the beam and a second liquid crystal cell that provides a variable degree of retardance, thereby allowing adjustment of the center frequency of the sinusoidal function. Finally, a third liquid crystal cell adjustably rotates the polarization of the beam. A final polarizer provides amplitude control of the beam based on the polarization rotations introduced by the first and third liquid crystal cells. A controller provides control signals to the liquid crystal cells of each sinusoidal filter so that their combined sinusoidal attenuation functions produce a desired equalization curve. |
申请公布号 |
WO0246835(A2) |
申请公布日期 |
2002.06.13 |
申请号 |
WO2001US47577 |
申请日期 |
2001.12.05 |
申请人 |
CHORUM TECHNOLOGIES LP |
发明人 |
XU, MING;HUANG, TIZHI;MAO, CHONGCHANG;LIU, JIAN-YU;WU, KUANG-YI;WONG, CHARLES |
分类号 |
G02F1/01;G02F1/1347;H01S3/067;H01S3/10;H04B10/17 |
主分类号 |
G02F1/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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