[OPTICAL REVIEW Vol. 12, No. 2 (2005) 61-64]
© 2005 The Optical Society of Japan
Polarization Independent Three-Element Solc-Type Birefringent Optical Fiber Loop Filters
Noriaki ONODERA, Kenichiro TSUJI, Takuya WATANABE and Masatoshi SARUWATARI
Department of Communications Engineering, National Defense Academy 1-10-20 Hashirimizu, Yokosuka, Kanagawa, 239-8686 Japan
(Received November 26, 2004; Accepted January 18, 2005; Revised January 17, 2005)
Polarization-independent birefringent optical fiber loop filters with narrowband transmission characteristics are studied. Using Jones matrix analysis, a three-element fiber loop filter structure, performing as a Solc-type narrow band filter is designed and fabricated. By selecting proper splice angles between these three elements as well as their birefringence, a narrowband, polarization-independent periodic optical filter with 0.63-nm transmission bandwidth and 2.71-nm transmission period is realized.
Key words: optical filter, wavelength division multiplexing, fiber loop filter, birefringent filter, Solc filter, Sagnac loop mirror