Difference between Direct modulation vs External modulation
Direct Modulation - an overview | ScienceDirect Topics
Distributed Feedback Lasers Studied | Jan 2003 | Photonics Spectra
Lasers for Communications: Optical injection locking brings back direct- modulation telecom lasers | Laser Focus World
Electroabsorption‐modulated laser as optical transmitter and receiver: status and opportunities - Schrenk - 2020 - IET Optoelectronics - Wiley Online Library