Optical add-drop module with low loss and high isolation

Details Optical add-drop module with low loss and high isolation Optical add-drop module with low loss and high isolation

H - Electricity

04

J

H04J 14/02 (2006.01) H04B 10/14 (2006.01)

Patent

CA 2310972

An optical add-drop module (OADM) includes in the through-path exactly two thin-film filters (TFFs) having respective passbands that approximately coincide in wavelength. Each TFF has a respective across-the-band isolation level, representing the smallest isolation achieved at and wavelength within the passband. The respective reflection characteristic curves of the two TFFs are at least partially complementary, such that the OADM isolation level exceeds the logarithmic sum of the across-the-band isolation levels of the respective TFFs.

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