Luiz Anet Neto

Simple Estimation of Fiber Dispersion and Laser Chirp Parameters Using the Downhill Simplex Fitting Algorithm

We report on a simple and fast method to estimate the fiber dispersion and laser chirp parameters on a dispersive Intensity Modulation and Direct Detection (IM/DD) optical channel. Based on the general IM/DD small-signal frequency response, we use the Downhill-Simplex algorithm to fit the channel measurement retrieved with a network analyzer to a general mathematical model. The method is proven to be quite efficient for light sources of different natures and with different adiabatic and transient chirp characteristics, including a Distributed Feedback (DFB) laser, an Electroabsorption modulator (EAM) and even a Reflective Semiconductor Optical Amplifier with fiber-Bragg grating (RSOA-FBG).

Dispersion Compensation-Free IM/DD SSB-OFDM Transmission at 11.11 Gb/s Over 200 km SSMF Using Dual EML

We report on a novel optical single sideband-orthogonal frequency division multiplexing system for access and metro networks based on a single, low cost dual electro-absorption modulated laser. The experimental results successfully demonstrate transmissions at 11.11 Gb/s over 200 km uncompensated standard single mode fiber through intensity modulation and direct detection.

High bit rate burst mode optical OFDM for next generation passive optical networks

We experimentally demonstrate the feasibility of TDMA Adaptively Modulated Optical OFDM (TDMA-AMOOFDM) with two directly-modulated low-bandwidth VCSELs at 1310nm and an APD originally designed for continuous transmissions.

How does passive optical network tackle radio access network evolution

This paper describes full service access network operator group perspectives on the feasibility of optical access networks to carry radio access network traffic for the existing and future mobile generations. The paper discusses topics related to the evolution of radio access interfaces, such as backhaul, midhaul, and fronthaul, their transmission through optical distribution networks, and passive optical network technology feasibility based on both time and wavelength division multiplexing and multiple accesses. Technology extensions are also discussed to provide guidance for future research.

10 Gb/s Continuous Clock and Data Recovery for Burst Mode Transmissions with Externally Modulated Laser

We present the performance of a newly developed receiver with embedded CDR for 10 Gb/s burst data transmission. A 30dB loss budget with 6dB extinction ratio, 1024 bits preamble and 12.5 ?s bursts is demonstrated.

Pre-coded NRZ and electrical duo-binary transmission in C and O-band at data bit rates up to 25 Gbit/s

In this paper we present real-time transmission performances up to 25 Gbit/s for optical access network. Our solution is based at transceiver side on pre-coded NRZ and electrical duo-binary modulations using limited electrical bandwidth DML in C and O band. At the receiver side, an electrical duo-binary receiver based on an 8 GHz APD photodiode combined with an online duo-binary to binary converter is employed.

Photonic crystal SOI RF filter for channel equalization

We experimentally demonstrate the operating principles of a silicon-on-insulator interferometer for channel equalization purposes. The radio frequency filter is reconfigurable thanks to thermally controlled photonic crystal coupler and delay line.

Dispersion uncompensated IM/DD transmissions of 12GHz-wide multi-band OFDM over 100km with a D-EML

Generation of optical SSB signals by a D-EML is extended to its whole bandwidth. In an SSB context, 12GHz multi-band OFDM signal is transmitted through 100km intensity modulation/direct detection dispersive channel without frequency fading.

Experimental investigation of dispersion-induced distortions in IMDD OFDM PON transmissions

We experimentally investigate the influence of the intensity modulation index of an OFDM signal submitted to propagation through a dispersive fiber and direct detection at the receiver. We evaluate the role of the parasite phase modulation component created by the laser chirp and its influence on the systems in-band and out-of-band noise.

Optical Transmission Performance for Directly Modulated Laser Considering Laser Chirp and Fiber Dispersion Using Adaptively Modulated Optical Orthogonal Frequency Division Multiplexing

Abstract Fiber dispersion coupled with the chirp parameter of the laser impacts the optical transmission system performance. Fiber dispersion causes the propagating pulses to spread and overlap, and the chirp produces a wavelength shift arising from the intensity variation of the laser. Coupled with the Levin-Campello bit-loading algorithm, adaptively modulated optical orthogonal frequency division multiplexing optimizes the data rate by taking into consideration the channel quality. This article shows the system performance for optical links starting with an optical back-to-back and ending with 125 km of single-mode fiber with a fixed optical budget of 30 dB for all distances.