CW DFB Fiber Laser Module Manufacturers

Accurate and real-time detection of methane gas becomes critical for natural gas pipelines leakage monitoring, household safety and coal mining safety production monitoring.

The grating coupler uses grating technology to couple optical signals into optical fibers, and uses the principle of grating diffraction to connect the transmitted optical signals with the optical field inside the optical fiber. The fundamental principle is to use high-frequency acoustic wave fields as gratings to divide light waves into many small light waves, and project them into optical fibers, thereby realizing the coupling and transmission and reception of optical signals.

The wavelength of the 10G conventional SFP+ DWDM optical module is fixed, while the 10G SFP+ DWDM Tunable optical module can be configured to output different DWDM wavelengths. The wavelength tunable optical module has the characteristics of flexible selection of the working wavelength. In the optical fiber communication wavelength division multiplexing system, Optical add/drop multiplexers and optical cross-connects, optical switching equipment, light source spare parts and other applications have great practical value. Wavelength tunable 10G SFP+ DWDM optical modules are more expensive than conventional 10G SFP+ DWDM optical modules, but they are also more flexible in use.

Single-frequency fiber lasers have a very narrow limit linewidth, and their spectral line shape is Lorentz type, which is significantly different from single-frequency semiconductors. The reason is that single-frequency fiber lasers have longer laser resonant cavities and longer photon lifetimes in the cavity. This means that single-frequency fiber lasers have lower phase noise and frequency noise than single-frequency semiconductor lasers.

Femtosecond lasers are lasers that can emit optical pulses with a duration of less than 1 ps (ultrashort pulses), that is, in the femtosecond time domain (1 fs = 10−15 s). Therefore, such lasers are also classified as ultrafast lasers or ultrashort pulse lasers. For generating such short pulses, a technique called passive mode locking is often used.