Abstract

We demonstrate a terahertz wave signal remote dissemination system, which transfers a phase-stabilized 1THz signal over 40 km urban telecom fiber link. The phase fluctuation induced by the separate path and optical fiber transmission is detected by dual-heterodyne phase error transfer and compensated with fast response acousto-optic frequency-shifter. Moreover, the feedback network is designed with frequency independent in mind such that signal processing is performed at intermediate frequency rather than radio frequency. At laboratory tests, the residual phase noise of the remote 1THz signal is measured to be -35 dBc/Hz at 1 Hz offset, and long-term stability of 1×10^-15 at 1000s averaging time is achieved.

© 2014 Optical Society of America