Real-time 2037 Gb/s optical OFDM receiver for PON IM/DD systems

Abstract

This paper presents the hardware architecture of an OFDM receiver suitable for optical communications. The receiver has been implemented in an FPGA device and used to demonstrate experimentally an optical OFDM transmission in a passive optical link with a directly modulated DFB laser and DAC/ADC at 5 GS/s. A bit rate of 20.37 Gb/s is achieved using an OFDM signal with subcarrier modulation format up to 512-QAM, it has been successfully transmitted over 10 km SSMF with a spectral efficiency of 8.38 bit/s/Hz.

Performance evaluation of OFDM and SC-QAM backhaul provision on FTTH optical access networks including multi-core fiber riser

“…The cyclic prefix length is set to 16 samples to cope with the impulse response length of the filters and the chromatic dispersion of long-reach optical links. More information about the OFDM generation can be found in [7]. These electrical signals are modulated with Mach-Zehnders over two distributed feedback laser (DFB) operating at the same wavelength (1555.75 nm) to evaluate the worst-case optical crosstalk scenario.…”

“…Direct PIN photodetection is implemented before sampling the signal with an oscilloscope (DSO 91304A) for MATLAB post-processing. Integrated reception can be performed also in real-time using an FPGA device and an EV10AQ190A analog-to-digital converter (ADC) [7].…”

Research and Implementation of High-Speed Data Streams Symbol Synchronization Algorithm Using Training Sequence in IMDD-OOFDM System

“…With the increasing bandwidth of optical communication networks, the increasingly supported sampling rate of the physical layer and more application of high-speed data streams systems will be needed. At present, the intensity-modulation and directdetection optical orthogonal frequency division multiplexing (IMDD-OOFDM) systems based on FPGA can be run the bit rate of 20.37 Gb/s [1]. The increasing of sampling rate poses a challenge to the symbol synchronization of system.…”

A Computational Efficient Nyquist Shaping Approach for Short-Reach Optical Communications

“…Next-generation short reach optical systems are being researched with the aim of improving the spectrum efficiency. A large proportion of the works found in the literature related to this topic makes use of Orthogonal Frequency-Division Multiplexing (OFDM) [4], [5], [6]. In contrast to OFDM, Nyquist signaling [7], [8] offers an interesting alternative that is deeply developed throughout this work.…”