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Very high-capacity short-reach VCSEL systems exploiting multicarrier intensity modulation and direct detection.

Alberto Gatto, Debora Argenio, Pierpaolo Boffi

|July 14, 2016

Summary

This study demonstrates high-capacity optical communication systems using multicarrier modulation with Vertical-Cavity Surface-Emitting Lasers (VCSELs). Tailored frequency division multiplexing (FDM) overcomes system limitations, achieving data rates up to 34 Gb/s over 20 km.

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Area of Science:

Optical communications
Photonics
Signal processing

Background:

Bandwidth limitations in Vertical-Cavity Surface-Emitting Lasers (VCSELs) hinder high-capacity short-reach optical systems.
Direct detection systems often face challenges with non-uniform frequency responses in optical fiber transmission.

Purpose of the Study:

To develop a high-capacity, simple optical communication system for short-reach applications.
To overcome the inherent bandwidth limitations of VCSELs and fiber optic channels.

Main Methods:

Exploiting multicarrier intensity modulation with a bandwidth-limited long-wavelength VCSEL.
Employing direct detection and tailored Frequency Division Multiplexing (FDM) subcarrier modulation and allocation.
Compensating for non-uniform system frequency response caused by direct modulation, detection, and Single-Mode Fiber (SMF) propagation.

Main Results:

Demonstrated a whole transported throughput ranging from 34 Gb/s to 25 Gb/s.
Achieved these data rates over Single-Mode Fiber (SMF) propagation distances from a few hundred meters to 20 km.
Successfully utilized a 5-GHz band VCSEL source, overcoming its bandwidth limitations.

Conclusions:

Multicarrier intensity modulation combined with direct detection offers a viable solution for high-capacity short-reach optical systems.
Tailored FDM strategies effectively compensate for system impairments, enabling high data rates even with limited VCSEL bandwidth.
The experimental results validate the proposed system's performance for practical short-reach optical communication applications.