Expanding amplitude-squeezing bandwidth with off-peak dispersive optical feedback

Area of Science:

• Optics and Photonics
• Semiconductor Physics

Background:

• Weak optical feedback is known to reduce semiconductor laser noise and generate amplitude-squeezed states.
• Current methods often utilize on-peak optical feedback, which has limitations in bandwidth and repeatability.

Purpose of the Study:

• To propose and analyze a novel off-peak optical feedback scheme for semiconductor lasers.
• To demonstrate the enhancement of squeezing bandwidth and repeatability using this new scheme.

Main Methods:

• Theoretical analysis and modeling of semiconductor laser dynamics under optical feedback.
• Investigation of the off-peak optical feedback condition, particularly under zero-frequency-pulling.

Main Results:

• The off-peak optical feedback scheme significantly expands the squeezing bandwidth.
• Enhanced repeatability is achieved compared to the conventional on-peak feedback method.
• The zero-frequency-pulling condition further amplifies the squeezing bandwidth enhancement.

Conclusions:

• The proposed off-peak optical feedback scheme offers a superior method for generating amplitude-squeezed states in semiconductor lasers.
• This approach provides a practical pathway to wider squeezing bandwidths and more reliable experimental outcomes.