A.M. Melo

Noise suppression properties of an interferometer-based regenerator for differential phase-shift keying data

We studied the amplitude and phase noise suppression properties of an all-optical regenerator for differential phase-shift keying data. A detailed analytical investigation is performed and compared with numerical simulations for different working points. The results show that both amplitude and phase can be regenerated. However, simultaneous amplitude and phase noise suppression is possible only if the phase degradation is stronger than the amplitude degradation, for instance, due to nonlinear phase noise.

Time-domain amplified spontaneous emission noise model of semiconductor optical amplifiers

A full time-domain model for semiconductor optical amplifiers (SOA) is proposed where the whole spontaneous emission (SE) noise bandwidth is amplified by implementing the material gain dispersion as a finite impulse response (FIR) filter function. The model is validated through comparison to experimental results from a commercial device.

Frequency vs. time-domain amplified spontaneous emission (ASE) noise modeling of semiconductor optical amplifiers (SOAs)

This work investigates two modeling approaches for the amplified spontaneous emission (ASE) noise of a semiconductor optical amplifier (SOA), namely a frequency-domain approach (FDA) and a time-domain approach (TDA). The theoretical results are then compared with experimental ones obtained from a commercial device.

Design optimization of ultra-high bit-rate NOLM-based OTDM demultiplexers

The performance of a NOLM gate as an OTDM demultiplexer for 640 Gbit/s to 40 Gbit/s was investigated considering the characterization of the switching windows through the integrated contrast ratio. The results show that short loop lengths should be preferred.

Bit-rate flexible high-speed OTDM add/drop multiplexing

In this paper, we have performed numerical investigations on the ADM performance from an aggregate bit stream of 160Gbit/s to 10Gbit/s and 40Gbit/s data rates. A validated SOA model based on was used in our investigations. The input pulses are sech/sub 2/ shaped with a pulse width of 1.5ps. The delay between control pulses was set to /spl Delta/T=6ps and the average data power was assumed to be -15dBm while the control power was varied. In the present work we assume that the data signal does not saturate the amplifier, i.e., the gain and phase dynamics are determined only by the control signal.

Feasibility of 320Gbit/s OTDM Add/Drop Multiplexing Using an Optimized GT-SOA-MZI Gate

We demonstrate through numerical simulations Add/Drop multiplexing from 320Gbit/s to base data rates of 10Gbit/s, 40Gbit/s and 80Gbit/s. Such high bit rates become feasible when using a GT-SOA-MZI gate in an optimized configuration.

On the performance of OTDM receivers

The performance of OTDM receivers is analyzed. It Is shown that an OTDM receiver can be described by an equivalent ETDM receiver. The switching window shape is optimized by evaluation of exact photocurrent statistics.

Analysis of add/drop multiplexing from 160 Gbit/s to 10 Gbit/s and 40 Gbit/s with a modified SOA-MZI gate

A novel setup for add/drop multiplexing that allows independent drop and clear port optimization in a SOA-MZI gate is proposed. Numerical simulations show high extinction ratios at 160:10 and 160:40 Gbit/s with this scheme if the data wavelength is shifted towards the SOA bandgap.

Crosstalk analysis of longer SOAs for demultiplexing to the base data rate of 10 Gbit/s and 40 Gbit/s

We report on the crosstalk and transmittance performance of a Mach-Zehnder-interferometric switch for demultiplexing from 160 Gbit/s to 10 Gbit/s or 40 Gbit/s. SOA lengths of 0.4 mm, 0.8 mm, 1.5 mm and 3.0 mm are investigated.