All-optical AM-to-FM up-conversion for radio-over-fiber

摘要

A laser source is configured for all-optical AM-FM up-conversion. In one exemplary embodiment, an amplitude modulated (AM) optical input signal containing a baseband signal at a sub-microwave frequency, is injected into the laser source. The amplitude of the AM optical input signal and the optical carrier frequency are adjusted so as to place the laser source in a period-one dynamical state characterized by a transitioning of the laser source from a free-running optical frequency to at least two optical frequencies having a separation distance equal to a period-one microwave frequency. As a result of the period-one dynamical state, a frequency modulated (FM) optical output signal containing the baseband signal carried at the period-one microwave frequency, is propagated out of the laser source. The period-one microwave frequency is operative as a sub-carrier signal.

主权项

1. An optical up-conversion system, comprising:
a laser source configured for receiving an amplitude modulated (AM) optical input signal comprising a baseband signal at a sub-microwave frequency, and converting the baseband signal to a frequency modulated (FM) optical output signal carried by a microwave frequency generated by a single-frequency periodic oscillation of the laser and operative as a sub-carrier signal, wherein the laser source is placed in a period-one dynamical state comprising at least two optical frequency sidebands having a separation distance equal to the microwave frequency, and wherein the optical frequency sidebands comprise a first lower frequency sideband that is more than 10 dB stronger than a second higher frequency sideband.