Injection locking for stable all-optical pulse generation via gain-induced FWM

Abstract

We propose and demonstrate a technique to stabilize pulse generation based on gain-induced four wave mixing (FWM) via injection locking with no feedback. Robust and low-phase noise pulse generation was achieved. Pulse-train generation from 230 MHz to ∼76 GHz with a linewidth of ∼1 Hz is experimentally demonstrated. The injection locking effectively narrows the linewidth of the generated pulse by four orders of magnitude. The fiber ring cavity reduces the sideband phase noise by 100 times and suppresses the residual injection signal by three orders of magnitude.

Stable broadband all-optical pulse generation with 1 Hz phase noise

“…In this work, we drastically improve upon recent all-optical short pulse genertion [4] by using injection locking. Robust and low-phase noise pulse generation ranging from 230 MHz ~ 76 GHz with a line-width ~ 1 Hz is experimentally demonstrated [5]. The technique for achieving short pulses using such low phase noise across the operating range is demonstrated in Fig.…”