发明名称 |
Device and method for variable attenuation of an optical channel |
摘要 |
A device for variable attenuation of an optical channel includes an elongated core surrounded by a cladding. Optical energy propagating along the longitudinal axis of the core is normally confined thereto by the difference in refractive indices between the core and cladding. The thermo-optic coefficients of the core and cladding are closely matched such that waveguide confinement is substantially invariant with respect to ambient temperature. The device further includes a thermal source arranged above the core. The thermal source is operable to generate a temperature gradient of controllable magnitude along a vertical axis extending through the core. The temperature gradient causes reduction of the local refractive index within the core relative to surrounding regions of the cladding such that a portion of the optical energy is deflected away from the thermal source and extracted from the core.
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申请公布号 |
US2002018636(A1) |
申请公布日期 |
2002.02.14 |
申请号 |
US20010919711 |
申请日期 |
2001.08.01 |
申请人 |
GEMFIRE CORPORATION |
发明人 |
BISCHEL WILLIAM K.;KOWALCZYK TONY C. |
分类号 |
G02B27/28;G02F1/01;G02F1/065;G02F1/31;H04J14/02;H04J14/06;(IPC1-7):G02B6/26 |
主分类号 |
G02B27/28 |
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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