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Broad-band (⩾20 GHz) laser-diode-based optoelectronic microwave phase shifter

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5 Author(s)
Gong-Ru Lin ; Inst. of Electro-Opt. Eng., Tatung Inst. of Technol., Taipei, Taiwan ; Tzung-Shi Hwang ; Chuang, Y.-H. ; Wang, S.C.
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We demonstrate a new type of broad-band microwave phase shifter with superior performance at frequencies up to 20 GHz. This is implemented by simply adding an offset voltage prior to the loop filter (LF) in a laser-diode-based digital optoelectronic phase-locked loop (OEPLL). Accurate control of the phase of microwave signals with a continuously tunable range exceeding 640° (~3.6 π) is achieved. The phase fluctuation and long-term drift of any desired phase shift are as small as ±0.40° and 0.08°, respectively, at 20 GHz. The relative phase instability can be maintained within 0.09° while operating in a phase-shift-keying (PSK) scheme. We also demonstrate accurate control of relative phase difference between dual phase-locked microwave sources using the phase shifter. Our results indicate potential application of this broad-band optoelectronic phase shifter in a phased-array antenna system

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:46 ,  Issue: 10 )