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Broad-band (>/-20 GHz) laser-diode-based optoelectronic microwave phase shifter
- Source :
- IEEE Transactions on Microwave Theory and Techniques. Oct, 1998, Vol. 46 Issue 10, p1419, 8 p.
- Publication Year :
- 1998
-
Abstract
- 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 [degrees] ([approximately]3.6[Pi]) is achieved. The phase fluctuation and long-term drift of any desired phase shift are as small as 5 [+ or -] 0.4 [degrees] and 0.08 [degrees], respectively, at 20 GHz. The relative phase instability can be maintained within 0.09 [degrees] 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. Index Terms - Microwave, optoelectronic, phase shifter.
Details
- ISSN :
- 00189480
- Volume :
- 46
- Issue :
- 10
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Microwave Theory and Techniques
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.21241798