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resistion
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re: Photonic PCBs inching closer
resistion   2/5/2013 8:22:31 AM
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Any optics person would know bends in waveguides cause light loss as total internal reflection is no longer satisfied.

IBMLabs
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re: Photonic PCBs inching closer
IBMLabs   2/5/2013 1:07:56 PM
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With waveguides, loss-less bends can be made in case the index contrast is large enough compared to the bending radius of the bend. In the optical ray model, the total internal reflection condition is then still satisfied.

resistion
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re: Photonic PCBs inching closer
resistion   2/5/2013 2:27:37 PM
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If the index difference is that large, you have to worry about coupling loss from reflection at the waveguide end.

junjunwu168
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re: Photonic PCBs inching closer
junjunwu168   2/7/2013 1:54:53 AM
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If the waveguide is not isolated it is probably in touch with the polyimide FPCB. PI has higher RI than silicone. So to form a lossless waveguide during bending in smaller diameter you will need a low RI cladding to the silicone. Fluoropolymer is probably the only choice for silicone. Am I missing something?

jeremybirch
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re: Photonic PCBs inching closer
jeremybirch   2/5/2013 3:07:13 PM
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1) silicone is a analogue of carbon based polymers - but the chain is of silicon atoms not carbon ones. There are many different silicones. 2) do they deposit the silicone in tracks or are they coating a whole board then etching it? I don't think 45 minute drying time is very practical if you have to deposit it as tracks, but as a board coating it might just work

krisi
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re: Photonic PCBs inching closer
krisi   2/5/2013 8:01:28 PM
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Cool technology...would anyone be interested in presenting it at emerging technologies symposium in Grenoble in 2014? www.cmosetr.com, kris.iniewski@gmail.com

MeirG
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re: Photonic PCBs inching closer
MeirG   2/7/2013 12:19:28 PM
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Well, we now need optical connectors to optically couple signals on a plugin board to its motherboard...



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