Article

Photonic measurement of microwave frequency based on phase modulation.

Network Technology Research Centre, Nanyang Technological University, Singapore.
Optics Express (impact factor: 3.59). 05/2009; 17(9):7217-21.
Source: PubMed

ABSTRACT A photonic approach for microwave frequency measurement is proposed. In this approach, an optical carrier is modulated by an unknown microwave signal through a phase modulator. The modulated optical signal is then split into two parts; one part passes through a spool of polarization maintaining fiber (PMF) and the other one, through a dispersion compensation fiber (DCF), to introduce different microwave power penalties. After the microwave powers of the two parts are measured by two photodetectors, a fixed frequency-to-power mapping is established by obtaining an amplitude comparison function (ACF). A proof-of-concept experiment demonstrates frequency measurement over a range of 10.5 GHz, with measurement error less than +/-0.07 GHz.

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Keywords

ACF
 
amplitude comparison function
 
DCF
 
different microwave power penalties
 
dispersion compensation fiber
 
fiber
 
fixed frequency-to-power
 
measurement error
 
microwave powers
 
modulated optical signal
 
parts
 
photonic approach
 
two parts
 
unknown microwave signal