Frank Coluccio Technology Forum - ASAP Message Board

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Technology Stocks : Frank Coluccio Technology Forum - ASAP

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To: ftth who wrote (1679)	5/29/2000 12:24:00 PM
From: ahhaha	Read Replies (2) of 1782

Hmmm. Where have I seen something like this before: consider the AOTF in more detail. In this key component, the incident light is propagated over the optical waveguide and divided into perpendicular components Transverse Electric/Transverse Magnetic (TE/TM) by a perpendicular beam splitter (PBS). An acoustic wave is generated by applying a RF signal to the inter digital transducers (IDT). This acoustic wave travels through the SAW guide and causes a periodic modulation of the refractive index of the optical waveguide. This change of refractive index induces TE-TM or TM-TE conversion for only the drop wavelength. The drop wavelength corresponds to the applied RF frequency and becomes perpendicular to the incident light. The second PBS is then used to separate the drop wavelength from the incident light. An AOTF can be used to drop a single wavelength or multiple wavelengths in a simultaneous manner. By changing the number of RF signals and their respective frequencies, it is possible to control the number and frequencies of the drop wavelengths.

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