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Photonic generation of ultrawideband signals
using a delay interferometer |
| Fei WANG1,Xinliang ZHANG2, |
| 1.Wuhan National Laboratory
for Optoelectronics, School of Optoelectronic Science and Engineering,
Huazhong University of Science and Technology, Wuhan 430074, China；School of Mathematics
and Physics, Chongqing Institute of Technology, Chongqing 400050,
China; 2.Wuhan National Laboratory
for Optoelectronics, School of Optoelectronic Science and Engineering,
Huazhong University of Science and Technology, Wuhan 430074, China; |
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Abstract We demonstrate a novel scheme to generate ultrawideband (UWB) monocycle and doublet pulses by inputting a dark return-to-zero (RZ) signal into a delay interferometer (DI), which accords with the general features in future applied UWB system, namely, single optical source input, simple configuration and passive device. The two polarized interferential beams have a time delay and a phase difference when they propagate through the DI. By adjusting polarization controllers (PCs), the total phase difference, i.e., the sum of the relative optical-phase difference between two orthogonally polarized components caused by PCs and the optical-phase shift due to birefringence of the polarization-maintaining fiber (PMF), the orientation angle of the polarization beam-splitter (PBS) relative to the two axes of the PMF are able to be changed and controlled. When the appropriate conditions are met, UWB monocycle and doublet pulses are generated conveniently.
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Issue Date: 05 June 2010
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