Thomas Anfray

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).

The Dual-Electroabsorption Modulated Laser, a Flexible Solution for Amplified and Dispersion Uncompensated Networks Over Standard Fiber

We propose here a monolithically integrated dual RF access electroabsorption-modulated laser called D-EML for the generation of optical single-sideband signal for both nonreturn to zero and orthogonal frequency division multiplexing formats. The benefits of optical single-sideband over double sideband in terms of resilience against chromatic dispersion effects are presented for high-bit rate intensity modulation/direct detection transmissions over standard single mode fiber in the C-band. Both simulation and experimentation exhibit transmission distance enhancement in the case of dual modulation of the D-EML, i.e., in optical single-sideband configuration, making this optical source an interesting solution because of its low-cost, low-size, and reasonable-power consumption.

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.

Simulation of SSB-LC With D-EML for Extended PON Beyond the Chromatic Dispersion Limit

The dual electro-absorption modulated laser (D-EML) is a transmitter technology based on distributed feedback laser and electro-absorption modulator integrated on the same chip with dual independent-access modulation. The D-EML allows the adjustment of its optical signal spectral content by controlling independently the laser and modulator amplitude modulations in order to enhance the transmission distance beyond usual chromatic dispersion limit without increasing consumption, cost, and complexity. We develop a D-EML model based on experimental characterization in order to demonstrate by simulation the interest of dual-modulation format for optical systems at 10, 25, and 40 Gb/s.

Dispersion-independant Transmissions Through Direct Single Sideband Modulation Using a Dual-Electroabsorption Modulated Laser

Single-sideband Intensity Modulation-Direct Detection systems are known for providing range extension of dispersion limited optical transmissions. A monolithically integrated dual RF access electro-absorption modulated laser (D-EML) has been developed and tested exhibiting record performance.

Electroabsorption modulator chirp profile influence on D-EML modulation scheme at 10 Gb/s

The Dual Electroabsorption Modulated Laser (D-EML) is a transmitter technology specially design for dual drive. It is composed of an integrated Distributed Feed Back (DFB) laser and an Electro-Absorption Modulator (EAM) with dual independent modulation access. By controlling independently laser and modulator modulation amplitudes, its possible to adjust the chirp of this optical source and thus increase the transmission distance far beyond the chromatic dispersion limit. We develop a D-EML model based on experimental characterizations in order to study benefits of dual modulation scheme for optical systems at 10 Gb/s and above. In this paper, we propose to analyze the impact of the EAM chirp profile on the performances.