With the daily increasing demands for the applications of low-cost colorless optical transmitter modules in WDMPON

hybrid integrated miniaturized external cavity tunable lasers are receiving more and more attention for their simple implementation process

high signal quality

wide tuning range and other excellent features

On the basis of investigating and analyzing the factors affecting their modulation characteristics

this paper experimentally develops specifically structured miniaturized external cavity tunable lasers and analyzes their characteristics

obtaining some valuable conclusions concerning the impacts of laser resonator cavity length on modulation bandwidth and provides theoretical support to the device development at the later stages.