Measurement for waveform and chirping of optical pulses generated by directly modulated DFB laser and external EA modulator

• Published in: Optics and laser technology Vol. 37; no. 1; pp. 55 - 60
• Main Authors: Yang, Han, Liu, XiangSheng, Du, Jian, Sun, Wei, Li, DeHui, Yi, MaoBin, Du, GuoTong
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-02-2005; Elsevier Science
• Subjects: Applied sciences; Chirping; DFB laser diode; Electro-absorption modulator; Exact sciences and technology; Fringe-resolved SHG; Fundamental areas of phenomenology (including applications); Laser optical systems: design and operation; Nonlinear optics; Optical communication systems, multiplexers, and demultiplexers; Optics; Physics; Resonators, cavities, amplifiers, arrays, and rings; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Ultrafast processes; optical pulse generation and pulse compression; Fringe-resolved SHG; Chirping; DFB laser diode; Electro-absorption modulator; Pulse generation; Optical interference; Second harmonic generation; Electroabsorption modulator; Distributed feedback laser; Non linear optics; Optical communication systems; Injection laser; Measurement method; Experimental study; Optical pulse
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2004.02.013

Optical pulse generated by directly modulated distributed feedback (DFB) laser and external electro-absorption modulator (EAM) in virtue of the method of fringe-resolved second-harmonic generation correlation was measured. Without the pulse's shape being assumed, through the method of iterative reconstruct interference signal, the waveform and phase of the pulse was reconstructed. The full-wave at half-maximum (FWHM) of the pulse generated by EAM under the microwave modulation of
2.5
GHz
is
30.8
ps
, whose shape is close to that of the sech
2-type pulse. The FWHM of the pulse generated by DFB laser is
18.3
ps
, whose shape is close to that of the Lorenz-type pulse. And the original chirping of EAM is smaller than that of DFB laser.