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Coupler device has bandwidth of >50 nm
The Helica Tapered Coupler (TC) consists of two concentric cores that have low index contrast and a cladding that has high contrast. It offers standard wavelengths of 1550, 1310 and 980 nm. It has an extension ratio of >25 dB.
Chiral Photonics, www.chiralphotonics.com
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