Laser mode partition noise in lightwave systems using dispersive optical fiber

Simultaneous generation of wavelength division multiplexing PON and RoF signals using a hybrid mode-locked laser

“…However, in multimode lasers, the different modes compete for the available carriers and the amplitude noise in each mode increases, resulting in high modal RIN. This effect is known as MPN and has been previously studied in [27]. MPN is specially harmful when multimode lasers are used as multi-wavelength sources, which is our case, but may be reduced by means of hybrid mode locking [17].…”

A Radio-Frequency-over-Fiber link for large-array radio astronomy applications

“…Since the dispersion effects introduced by the fiber are small near 1310 nm and for the transmission distances considered in CHIME (approximately 100 m), the noise penalty introduced by the spectral impurity of the FP laser (e.g. Mode Partition Noise, a form of noise that arises from the random distribution of the photons produced by stimulated emission in each wavelength of the laser spectrum) is negligible [13] [15]. The RFoF link has NF = 27 dB (P ni = −147 dBm/Hz) and the corresponding SFDR is 115 dB · Hz 2/3 , or 57 dB in a 425 MHz bandwidth.…”

Array Feeds

“…Thinner depletion layers for higher frequencies absorb less light and hence are less efficient. At 10 GHz, efficiencies may be high, but at 60 GHz the efficiency may be as low as 30% (Wentworth et al, 1992). For such high microwave frequencies, waveguide structures with orthogonal carrier transport and absorption obviate the need for thin depletion layer.…”