Title :
Residual phase noise measurements of long microwave optical links and photodiodes using a two-tone method
Author :
Zhewei Cao ; Chun Yang ; Dezhao Zhu
Author_Institution :
Sch. of Electron. Sci. & Eng., Southeast Univ., Nanjing, China
Abstract :
A novel approach for measuring the residual phase noise (RPN) of microwave optical links (MOLs) and individual components in the MOL is proposed in this paper. Compared with the previous RPN measurement methods, the two-tone correlation-based method suppresses the noise contributions of the uncorrelated noise sources except that of the device under test (DUT). By this method, the RPN of externally modulated long microwave optical links (MOLs) is measured, the RPN of a 6-km fiber link was successfully measured to be -130 dBc/Hz at 1-kHz offset and -140 dBc/Hz at 10-kHz offset. In addition, the RPNs of the photodiode (PD) in different operation conditions were also measured by this method, the experiments reveal that the nonlinearity of PD can deteriorate its RPN.
Keywords :
interference suppression; microwave links; noise measurement; optical communication equipment; optical fibre communication; optical links; phase noise; photodiodes; DUT; MOL PD residual phase noise measurement; device under test; long microwave optical fiber link RPN measurement; noise suppression; photodiode RPN; two-tone correlation-based method; uncorrelated noise source; Microwave communication; Microwave measurement; Noise measurement; Optical fiber communication; Phase noise; correlation; measurement; microwave optical link; nonlinearity; photodiode; residual phase noise; two-tone;
Conference_Titel :
Optical Communications and Networks (ICOCN), 2015 14th International Conference on
Conference_Location :
Nanjing
DOI :
10.1109/ICOCN.2015.7203740
