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Furukawa Review No.20

Production Engineering of Polarization Beam Combiner

Hiroshi Matsuura, Takuma Aoki, Yasuhiro Watanabe, Daeyoul Yoon, Mamichi Tsuyuki, Hidehito Kagiwada, Masaru Abe, Toshihiko Ohta


A Polarization beam combiner has been developed, which is capable of doubling the output power of semiconductor pumping lasers by way of polarization multiplexing, thereby making it applicable to Raman amplifiers and high-power optical amplifiers for DWDM (Dense Wavelength Division Multiplexing) systems. The combiner has high reliability since its mechanical parts are high-strength welded using a YAG laser and also no adhesives are used in its optical paths. By optimizing optical parts characteristics and optical coupling, a broad bandwidth ranging from 1410 nm to 1580 nm has been realized together with a low insertion loss of 0.2 dB on average.

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