Research on Spectroscopy Modulation of a Distributed Feedback Laser Diode Based on the TDLAS Technique

Table 1

Comparison of characteristics among four wavelength modulation methods.

Parameter	Plasma effect	Electric field effect	Temperature effect	Mechanical effect
Δn	−0.04	−0.01	−0.01	——
Δλ	−8 nm	−1 nm	+5 nm	Depends on gain spectrum
Response time	∼ ns	∼ ps	∼ ms	∼ ms
Heat value	High	Very low	Very high	None
Technical difficulty	Medium	Medium	Simple	Complex