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The integration of a varifocal mirror with a scanner using wafer bonding technology is presented. The wafer bonding technology enables us to enlarge the design possibility. A 2 mm diameter varifocal mirror is bonded on the scanner. The optical scanning angle is 7° at 3.59 kHz. The focal length changes from infinity to 139 mm.
Inter-core crosstalk of multi-core fibers is stochastic and heavily dependent on various perturbations such as bend and twist, and of course on fiber structures. Characteristics of the crosstalk are described from theoretical and experimental results.
Various approaches for suppressing inter-core crosstalk of multi-core fiber and state-of-the-art low-crosstalk multi-core fiber feasible to ultra-long-haul transmission are reviewed. Additionally, preferable way to improve spatial spectral efficiency is discussed.
We propose a novel concept of cladding structure in all-solid photonic bandgap fibers. It promises low bending and confinement losses with single-mode operation. The mechanism is based on the new concept of heterostructured cladding.
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