OPTICAL-INJECTION LOCKING AND PHASE-LOCK LOOP COMBINED SYSTEMS

Optical injection locking and optical phase-lock loops have been used for laser synchronization. The use of a combined optical injection loc king and phase-lock loop system is proposed here. We have taken into a ccount the modification of the slave laser phase response induced by t he injection locking to calculated the phase-error signal spectrum and the phase-error variance for an optical injection locking and phase-l ock system. They show that this system presents both a wide locking ra nge, given by the optical injection locking action, and a low phase er ror for low frequencies, given by the optical phase-lock loop action. These results can improve the system tracking capability and decrease the final phase-error variance compared with those in isolated systems .