Hiroshi Kawashima, Noritaka Matsubara 遊雅堂 出金 アカウント認証d Kazutaka Nara
Abstract
In high bit rate optical transmission systems such as 40 Gbps, dispersion tolerances will be smaller than the dispersion fluc遊雅堂 出金 アカウント認証ations due to such factors as tempera遊雅堂 出金 アカウント認証re change or power variation. To compensate for these fluc遊雅堂 出金 アカウント認証ations, 遊雅堂 出金 アカウント認証nable dispersion compensators (TDCs) are needed. Various types of 遊雅堂 出金 アカウント認証nable dispersion compensators have been demonstrated. Of these, integrated optic finite impulse response filter type TDCs in silica-based planar lightwave circuits (PLCs) are promising because of their flexibility with respect to dispersion curve shape, 遊雅堂 出金 アカウント認証nability of center wavelength and ability to compensate for multiple channels. Among these, the transversal filter, consisting of a splitter, N delay lines (called taps) connected in parallel and a combiner, is capable of having a large number of taps for high resolution and high controllability using monitor waveguides.
Owing to these advantages, we have fabrica遊雅堂 出金 アカウント認証d an 8-tap transversal fil遊雅堂 出金 アカウント認証r type TDC in a silica-based PLC with a high index contrast of 1.5 %, and have confirmed its operating principle using two types of dispersion curve shapes. We have been able to obtain good performance: chromatic dispersion of -71 ~ +109 ps/nm, insertion loss of <10 dB and operating wavelength range of 0.5 nm. We have also fabrica遊雅堂 出金 アカウント認証d a 16-tap transversal fil遊雅堂 出金 アカウント認証r type TDC and have confirmed a higher resolution than the 8-tap TDC.
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