Multichannel transmission of intensity- and phase-modulated signals by optical phase conjugation using a quantum-dot semiconductor optical amplifier

Abstract

We report the demonstration of optical phase conjugation using a quantum-dot semiconductor optical amplifier. The transmission performance of wavelength-multiplexed 10-Gbit/s intensity- and phase-modulated signals is investigated for different channel alignments. In a 100-km transmission, we have successfully achieved high transmission performance with low power penalties for all the transmitted signals.

The impact of parametric noise amplification on long haul transmission throughput

“…In this section, we briefly review progress in OPC device and system development, concentrating on systems employing coherent detection [22]. OPCs have been fabricated from a wide variety of materials including fibre [23][24][25][26][27][28], bulk [29] and quantum dot [30] semiconductor optical amplifiers, periodically poled lithium niobate (PPLN) [31], silicon [32], soft glass [33] and using opto-electronic devices [34]. Figure 2a compares the performance of a selection of these devices for two key parameters, the achieved channel count determining the number of devices require for a system, and the conversion efficiency which determines the ASE noise penalty.…”

“…Positive conversion efficiencies have only been observed for fibre devices acting as parametric amplifiers and employing SBS suppression techniques [23][24][25], however, parametric gain has recently been reported in a PPLN device [35]. Data points are taken from [24][25][26][27][28][29][30][31][32][33][34][35]. Figure 2b illustrates the achieved performance improvements for systems employing both OPC and coherent detection, alongside the anticipated theoretical performance enhancement.…”

Sub-harmonic injection locking of quantum-dash lasers using spectral enrichment from semiconductor optical amplifiers

“…Compared to the above-mentioned approaches, spectral enrichment using SOAs is preferred due to their superior conversion efficiencies and compact footprint. They have been successfully used in several applications that require high nonlinear conversion efficiencies such as wavelength conversion [16], phase conjugation [17], and format conversion [18].…”