A proposed integrateable optical interleaver includes an input Y-branch
coupler and at least two multi-section optical couplers. The
multi-section optical couplers of the interleaver include at least three
substantially similar optical couplers, adjacent ones of the optical
couplers interconnected via at least one set of waveguides. The
interleaver of the present invention comprises a highly compact and
fabrication-robust form that is capable of being integrated onto a single
planar lightwave circuit.