Optical Single-Sideband Modulation Using a Fiber-Bragg-Grating-Based Optical Hilbert Transformer
Optical Single-Sideband Modulation Using a Fiber-Bragg-Grating-Based Optical Hilbert Transformer
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DOI：
10.1109/lpt.2011.2116114
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发表时间：
2011-05
影响因子：
2.6
通讯作者：
Ze Li;H. Chi;Xianmin Zhang;J. Yao
中科院分区：
文献类型：
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作者：
Ze Li;H. Chi;Xianmin Zhang;J. Yao
提出并演示了一种基于使用光纤布拉格光栅（FBG）实现的光学希尔伯特变换来实现光学单边带（OSSB）调制的全光学方法。在所提出的方法中，光双边带（ODSB）信号被平均分成两个通道，一个通道的输出是同相（I）分量，另一个通道的输出是正交相位（Q）分量。 Q 通道中集成了基于 FBG 的光学希尔伯特变换器 (HT)，使 HT 输出处的两个边带异相。来自两个通道的两个光信号的组合导致一侧带抵消，从而产生OSSB信号。进行了一项实验。生成频率为 6 至 15 GHz、边带抑制比 (SSR) 高达 20 dB 的 OSSB 信号。还研究了OSSB信号在45.6公里单模光纤上的传输。
An all-optical approach to realizing optical single-sideband (OSSB) modulation based on optical Hilbert transform implemented using a fiber Bragg grating (FBG) is proposed and demonstrated. In the proposed approach, an optical double-sideband (ODSB) signal is divided equally into two channels with the output at one channel being the in-phase (I) component and that at the other being the quadrature phase (Q) component. An FBG-based optical Hilbert transformer (HT) is incorporated in the Q channel, making the two sidebands out of phase at the output of the HT. The combination of the two optical signals from the two channels leads to the cancellation of one sideband, thus an OSSB signal is generated. An experiment is performed. An OSSB signal with a frequency from 6 to 15 GHz and a sideband suppression ratio (SSR) as large as 20 dB is generated. The transmission of the OSSB signal over a single-mode fiber of 45.6 km is also studied.