Multi-stage interferometer circuit with waveform shaping function
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United States of America Patent
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Aug 14, 2018
Grant Date -
Feb 1, 2018
app pub date -
Feb 19, 2016
filing date -
Feb 19, 2015
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Abstract
A multi-stage interferometer circuit of the present invention includes: a multiplexing port; (N−1) stages of lattice type two-beam interferometers, wherein each stage includes a two-beam delay circuit having a path length difference of an integral multiple of M·Δ L/2, and wherein the two-beam delay circuit of the lattice type two-beam interferometer of the first stage is connected to the multiplexing port; an M-beam interferometer including: two sets of 1×(M/2) optical couplers connected to the first optical coupler of the lattice type two-beam interferometer at the final stage; an M-array delay circuit, each delay circuit of which has a delay length different from each other by ΔL; and M×M optical couplers; and M demultiplexing ports, wherein one or more transversal filters are arranged inside the multi-stage interferometer circuit so that the light guided between the demultiplexing port and the multiplexing ports passes therethrough at least once.
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