In this paper, we proposed a new method to generate OAM beams based on modal interference principle in two mode fiber. Micro-waveguides were specially designed to excite and combine the high order mode for realizing the two-mode interference in the two-mode fiber. Advanced femtosecond laser processing technology was employed to inscribed the micro-waveguides at the two ends of the two-mode fiber. After optimizing the waveguide size, an in-line interferometer was successfully realized with a low insertion loss of 1.3 dB and a contrast of higher than 22 dB. Finally, the experimental results demonstrated that the left- and right-handed circularly polarized fundamental mode was successfully converted into the ±1-order OAM beams.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.