Process and system for tunable filter optical train alignment

摘要

An alignment process for a fiber optic system, which includes at least one lens 116 and a tunable filter element 120, comprises transmitting an optical signal into the system and detecting a back-reflection from the lens and/or the tunable filter element. The position of the lens 116 relative to the tunable filter element 120 is then manipulated in response to the back-reflection. This alignment can be used to prevent the excitation of higher order modes in the filter 120. <IMAGE>