Linearized Electro-Optical Modulation for Analog Radio over Fiber
Abstract
Intermodulation distortion (IMD) in Analog Radio-over-Fiber (a-RoF) poses a severe limitation to achievable error-free transmission. In this work, an optical feed-forward linearization scheme is presented and compared to an electrical pre-distortion solution. Both techniques show identical performance for intermodulation compensation of neighboring frequencies. The former suits wideband multi-carrier transmission better because it does not present limited operational bandwidth. Proof-of-concept experiments for reducing intermodulation and distortions are offered. A 5-dB improvement in the Error Vector Magnitude (EVM) distortion floor level is achieved. Trade-off between compensating for second and third harmonics was verified. Results indicate the solution allows maximal exploitation in a-RoF capacity.
- Publication:
-
Fiber and Integrated Optics
- Pub Date:
- November 2018
- DOI:
- 10.1080/01468030.2018.1511010
- Bibcode:
- 2018FiIO...37..314Y
- Keywords:
-
- Electro-optical modulation;
- intermodulation distortion;
- linearization;
- long-term evolution;
- radio over fiber