期刊
OPTICS COMMUNICATIONS
卷 284, 期 12, 页码 2695-2699出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2011.02.062
关键词
True-time delay; Phase modulation; Direct detection; Periodic dispersive device
类别
资金
- National Nature Science Foundation of China (NSFC) [60736003]
- 863 Project [2009AA01Z222, 2007AA01Z256]
- 973 Project [2006CB302805]
- Italian Ministry of Foreign Affairs
We propose a novel dispersion-based optical beamforming network scheme employing phase modulation and direct detection. Optical phase modulators have the advantages of simple-structure, low loss and absence of bias. Dispersion-induced phase-to-intensity conversion is utilized to facilitate direct detection. A structure of wideband dispersive device (WDD) cascaded with periodic dispersive device (PDD) is introduced to enhance the system flexibility, so that the delay adjustability and RF response can be properly designed respectively by choosing appropriate dispersions of the WDD and PDD. A concept-proof system with a wideband chirped fiber grating (CFG) as the WDD and two multiband CFGs (MCFG1 and MCFG2) as the PDD separately is built to demonstrate the basic idea. The delay tuning range is 0-1.8 ns with increment of 164.2 ps. The passband center is 30 GHz for MCFG1 and 20 GHz for MCFG2, and the fractional bandwidth is 51.8%. The shot-noise-limited spurious-free dynamic range is also analyzed and measured to be 105.7 dB Hz(2/3) when the average photocurrent is 2.7 mA. (C) 2011 Elsevier B.V. All rights reserved.
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