Hardware-efficient signal generation of layered/enhanced ACO-OFDM for short-haul fiber-optic links (original) (raw)

Single-IFFT Real-Time Layered/Enhanced ACO-OFDM Transmitter

2018 Optical Fiber Communications Conference and Exposition (OFC), 2018

Using only a single middle-out Fourier transform, we are able to generate all layers of a 16-QAM-encoded layered/enhanced ACO-OFDM transmitter. We transmit over 10-km of standard single-mode fiber without error propagation in the receiver.

Enhanced asymmetrically-clipped optical OFDM

2015

Asymmetrically clipped optical orthogonal frequency-division multiplexing (ACO-OFDM) is a technique that sacrifices spectral efficiency in order to transmit an orthogonally frequency-division multiplexed signal over a unipolar channel, such as a directly modulated direct-detection fiber or free-space channel. Several methods have been proposed to regain this spectral efficiency, including: asymmetrically clipped DC-biased optical OFDM (ADO-OFDM), enhanced U-OFDM (EU-OFDM), and spectral and energy efficient OFDM (SEE-OFDM). This paper presents a new method that offers the highest receiver sensitivity for a given optical power at spectral efficiencies above 3 bit/s/Hz, having a 7-dB sensitivity advantage over DC-biased OFDM for 1024-QAM at 87.5% of its spectral efficiency, at the same bit rate and optical power.