A passive optical tap that uses cladding modes in a single-mode
fiber to provide continuous adjustability of tapped power, large tapping
ratios, low excess loss, and structural compatibility with integrated circuit
technology has been fabricated and demonstrated. This prototype suffers
excess loss of less than 0.07 dB and yields tapping ratios as large as 36 dB.
System performance analysis of an optical bus incorporating the integrated
fiber-optic tap is discussed, and comparison to conventional singlemode
fiber-optic taps, such as fused couplers, is made.
Paul R. Prucnal,
Edward E. Harstead,
Stuart D. Elby,
"Low-loss, high-impedance integrated fiber-optic tap," Optical Engineering 29(9), (1 September 1990). https://doi.org/10.1117/12.55684