In the measurement, the baseband bandwidth was set to 80 MHz, which was equal to the bandwidth of the APD module, and the QAM-based DMT signals consisted of 128 subcarriers (the carrier spacing was 0.625 MHz).
The spectral acceptance bandwidth of the two modules is 7 nm, using 20 mm long PPLN crystals.
The bandwidth of the up-converter module is reported also in the graph.
Considering the spectral overlap of the degenerate SPDC spectrum and of the module bandwidth, each module will only be able to up-convert about 3% of the emitted photons.
Grush (2003), following Haugeland (1998), develops an idea of modularity in terms of the bandwidth of interaction, where modules are high-bandwidth in their internal interactions and low-bandwidth in their external interactions.
In each frame, the algorithm stores the amount of bandwidth received for each connection (lines 7 and 25), and verifies, using the QoSMonitoring module, if the minimum bandwidth of the rtPS and nrtPS services is within the predefined limits (lines 36 and 41).
The system was designed to cool down an HTS sampler module below 50 K, enabling a bandwidth of the chip more than 100 GHz.
The spectral bandwidth of the tunable filter also creates a signal modulation smoothing effect due to the small but finite bandwidth of the filtered light.
The second traffic optimizer (TO2) is a module which aims to reduce the actual bandwidth of the traffic flows by using data compression.
The operating bandwidth of combiners must be wide or wider than that of the amplifier modules to not to restrict the overall bandwidth of the combined amplifiers.
