High-Uniformity Star Coupler Using Diffused Light Transmission

Osamu TAKANASHI  Tsutomu HAMADA  Junji OKADA  Takeshi KAMIMURA  Hidenori YAMADA  Masao FUNADA  Takashi OZAWA  

IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.3   pp.339-345
Publication Date: 2001/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Interconnects/Optical Signal Processing)
Category: Device
optical interconnection,  star coupler,  diffused light transmission,  uniformity,  multichannel,  

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We propose a low-cost, high-uniformity, and low excess loss star coupler. The proposed star coupler comprises a planar lightguide, a diffuser, and polymer optical fibers (POFs). High-uniformity of optical power distribution was enabled by utilizing the diffused light transmission. Input light is diffused by the diffuser that is attached between the input POFs and the planar lightguide and transmitted through the planar lightguide. The optimum width-to-length ratio of the lightguide is clarified through simulations and experiments. We fabricated the star couplers based on the optimum width-to-length ratio for evaluation. The fabricated 1616 star coupler showed the excellent uniformity at the distribution ratio of 0.8 dB and the excess loss of 3.3 dB. The fabricated star coupler also provides a wide tolerance for misalignment. The maximum number of nodes to assure high transmission quality and the bandwidth of the proposed star coupler are discussed. The proposed star coupler is remarkably cost effective since it can be produced by injection-molding technology. The proposed star coupler enables easy multi-channel interconnection.