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Optical frequency combs (OFCs) are a revolutionary light source for numerous applications due to their precisely spaced coherent optical wavelengths. his paper will focus on OFCs for employment in next generation dense/ultra-dense wavelength division multiplexed high-speed optical communication systems, which places stringent requirements on the OFC. These requirements include stability, linewidth,...
Optical frequency comb (OFC) sources have proven to be useful in applications such as frequency metrology [1], spectroscopy [2], millimetre wave generation [3] and dense/ultra-dense wavelength division multiplexed high speed optical communications [4]. These applications require highly coherent, stable and cost efficient optical comb sources. Other important comb parameters include a flexible free...
Optical frequency comb sources have proven to be useful in applications such as frequency metrology [1], spectroscopy [2], space-based instruments [3] and dense/ultra-dense wavelength division multiplexed high speed optical communications [4]. These applications require highly coherent, stable and cost efficient optical comb sources. Other important comb parameters include a flexible free spectral...
The concept of wavelength division multiplexing (WDM) has revolutionized the field of optical communications. However, the immense demand for bandwidth shows no sign of abating and is pushing service providers to deploy communication networks with increased capacity. Optical transport networks will soon require channel data rates in excess of 100 Gb/s in order to continue to meet the ever increasing...
Optical transport networks will soon require channel data rates in excess of 100 Gb/s in order to continue to meet the demand for bandwidth. Bandwidth flexible optical networks, based on flex-grid ROADMs, have been proposed in the literature to support 400 Gb/s and 1 Tb/s super channels [1]. In such systems, techniques including coherent optical OFDM and Nyquist WDM transmission [2] may be employed...
The authors present a multi-carrier transmitter based on a gain switched laser employed in a next generation access network. The simple, robust and cost efficient direct modulation based comb generation technique offers closely spaced coherent channels. Each of the channels is imposed with 2.5 Gbaud data using QPSK and 16-QAM formats. The authors also present a performance comparison between the commonly...
Lasers with narrow-linewidth emission are a key component for higher-order modulation formats. We report on discrete-mode laser diodes designed for narrow-linewidth emission and demonstrate linewidths less than 80 kHz. Using these devices in quadrature phase shift keying and 16-quadrature amplitude modulation transmission setups, similar performance to that of an external cavity laser is demonstrated.
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