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Single-chip 32 × 32 star coupler with tapered fiber-coupling regions

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With the advancement of the optical coherent1 and amplification technologies, a practical use of a large-scale star coupler has become more feasible. Under these circumstances, fabrications of 8 × 8 star couplers were reported2,3 recently. However, the monolithic fabrication of a star coupler larger than 8 × 8 is difficult because the available device chip size may impose a limitation on a degree of integration.

© 1991 Optical Society of America

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