Phase Noise of Optically Generated Microwave Using Sideband Injection Locking
HUANG Jin, SUN Chang-Zheng, SONG Yu, XIONG Bing, LUO Yi
State Key Lab on Integrated Optoelectronics, Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084
Phase Noise of Optically Generated Microwave Using Sideband Injection Locking
HUANG Jin, SUN Chang-Zheng, SONG Yu, XIONG Bing, LUO Yi
State Key Lab on Integrated Optoelectronics, Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084
Optically generated 20-GHz microwave carriers with phase noise lower than -75dBc/Hz at 10kHz offset and lower than -90dBc/Hz at 100kHz offset are obtained using single- and double-sideband injection locking. Within the locking range, the effect of sideband injection locking can be regarded as narrow-band amplification of the modulation sidebands. Increasing the current of slave laser will increase the power of beat signal and reduce the phase noise to a certain extent. Double-sideband injection locking can increase the power of the generated microwave carrier while keeping the phase noise at a low level. It is also revealed that partially destruction of coherence between the two beating lights in the course of sideband injection locking would impair the phase noise performance.
Optically generated 20-GHz microwave carriers with phase noise lower than -75dBc/Hz at 10kHz offset and lower than -90dBc/Hz at 100kHz offset are obtained using single- and double-sideband injection locking. Within the locking range, the effect of sideband injection locking can be regarded as narrow-band amplification of the modulation sidebands. Increasing the current of slave laser will increase the power of beat signal and reduce the phase noise to a certain extent. Double-sideband injection locking can increase the power of the generated microwave carrier while keeping the phase noise at a low level. It is also revealed that partially destruction of coherence between the two beating lights in the course of sideband injection locking would impair the phase noise performance.
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2008, Vol. 25 
