▎ 摘　　要

NOVELTY - The system has a pulse signal emitting module (1) connected with a time delay scale adjusting module (8) that is connected with a computer end data coding system unit (16). The pulse signal emitting module is utilized for generating a basic mode-locked signal. The time delay scale adjusting module is utilized for modulating a bidirectional basic mode-locked pulse output by the pulse signal emitting module. The signal processing system unit receives an output signal modulated by the time delay scale adjusting module, and encoded by the signal processing system unit. USE - System for coding information of bidirectional mode-locked fiber laser in scientific research, industrial application and optical communication field. ADVANTAGE - The oxidized graphene/polyvinyl alcohol film is inserted as saturable absorber into the bidirectional laser to realize mode locking, so that the system has low cost, and has simple process steps and convenient characteristics. The system uses full optical fiber structure without external signal to modulate, and does not need modulation intervention of external signal, thus reducing the system design cost and the operation is more convenient. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a system for coding information of bidirectional mode-locked fiber laser. 1Pulse signal emitting module 2Laser diode pumping source 3Wavelength division multiplexer 3aFirst port 3bSecond port 3cThird port 4Gain light 5Polarization controller 6Optical coupler 6aFirst port 6bSecond port 7Oxidizing saturated graphene 8Time delay scale adjusting module 9First polarization independent isolator 10Second polarization-independent isolator 11First optical coupler 11aFirst port 11bSecond port 11cThird port 12First time delay modulator 13Second time delay modulator 14Second optical coupler 14aFirst port 14bSecond port 14cThird port 15Third optical coupler 15aFirst port 15bSecond port 15cThird port 16Signal processing system unit 17Photoelectric detector 18Oscillograph 19Computer terminal data coding system unit