Demonstration of generating a 100 Gbit/s orbital-angular-momentum beam with a tunable mode order over a range of wavelengths using an integrated broadband pixel-array structure
Abstract
We experimentally generate an orbital-angular-momentum (OAM) beam with a tunable mode order over a range of wavelengths utilizing an integrated broadband pixel-array OAM emitter. The emitter is composed of a 3-to-4 coupler, four phase controllers, and a mode convertor. An optical input is split into four waveguides by the coupler. Subsequently, the four waveguide fields are coherently combined and transformed into a free-space OAM beam by the mode convertor. By tuning the phase delay Δ φ between the four waveguides using the integrated phase controllers, the OAM order of the generated beam could be changed. Our results show that (a) a single OAM beam with a tunable OAM order ( ℓ = − 1 or ℓ = + 1 ) is generated with the intermodal power coupling of − 11 d B , and (b) in a wavelength range of 6.4 nm, a free-space link of a single 50 Gbaud quadrature-phase-shift-keying (QPSK) channel carried by the tunable OAM beam is achieved with a bit error rate below the forward-error-correction threshold. As proof of concept, a 400 Gbit/s OAM-multiplexed and WDM QPSK link is demonstrated with a ∼ 1 − dB OSNR penalty compared with a single-beam link.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 23, 2021
- Source ID
- 10.1364/ol.435725
Entities
People
- Alan E. Willner
- Amir Minoofar
- Cong Liu
- Hao Song
- Haoqian Song
- Huibin Zhou
- Kai Pang
- Kaiheng Zou
- Moshe Tur
- Nanzhe Hu
- Robert Bock
- Runzhou Zhang
- Shlomo Zach
- Xinzhou Su
Organizations
- Air Force Research Laboratory
- Defense Security Cooperation Agency
- Office of Naval Research
- Tel Aviv University
- University of Southern California