Modified integrated optic Fresnal lens for waveguide-to-fiber coupling

Area of Science:

• Optics and Photonics
• Integrated Optics

Background:

• Traditional waveguide Fresnel lens design, adapted from bulk and micro-optics, assumes negligible lens thickness.
• This assumption is invalid for integrated optic devices with small mode-index modulations and long wavelengths.
• This leads to unpredictable focal properties and reduced lens efficiency, limiting their use as waveguide-to-fiber couplers.

Purpose of the Study:

• To modify the standard Fresnel lens design procedure to explicitly account for lens thickness.
• To compare the performance limitations of standard and modified Fresnel lenses.

Main Methods:

• Outlined both the standard and modified Fresnel lens design procedures.
• Utilized computer simulations to compare the performance of test lenses based on both designs.

Main Results:

• The modified design explicitly incorporates lens thickness, addressing a key limitation of traditional methods.
• Computer simulations predicted better performance for the modified Fresnel lens compared to the standard design.

Conclusions:

• The modified waveguide Fresnel lens design offers improved focal properties and efficiency for integrated optic devices.
• This enhanced design is crucial for effective waveguide-to-fiber coupling applications.