Polarization-insensitive variable optical attenuator

摘要

A polarization-insensitive broad-band variable optical attenuator (10) includes a first Mach-Zehnder interferometer (MZI) stage (12) having a polarization dependence loss of a first polarity, and a second Mach-Zehnder interferometer (MZI) stage (14) coupled in series, or cascaded, to the first Mach-Zehnder stage (12) and having a polarization dependence loss of an opposite polarity to the first polarity.