Key Features of DFB Butterfly Lasers

1. Wavelength Selectivity

The DFB grating provides wavelength-selective feedback, allowing the laser to operate around a designated wavelength. This is useful in systems with specific wavelength requirements.

2. Single-Longitudinal-Mode Operation

A properly designed DFB structure can support single-longitudinal-mode operation, reducing unwanted spectral modes. Actual performance should be evaluated using specifications such as SMSR.

3. Good Wavelength Stability

When combined with a TEC and thermistor, a DFB butterfly laser can maintain a more stable operating temperature. This helps reduce wavelength variations caused by temperature changes.

4. Fiber-Coupled Output

Many butterfly laser modules are available with fiber pigtails. Depending on the application, single-mode fiber or polarization-maintaining fiber can be selected for integration into optical communication, sensing, and measurement systems.

5. Integrated Functions

Depending on the design, the butterfly package can integrate a TEC, monitor photodiode, and optical isolator. This can simplify system integration and thermal management.