Self-phase modulation in a highly nonlinear fiber (HNLF) had been demonstrated to have regeneration capabilities when
associated with shifted filtering. In this paper, we show how a saturated semiconductor optical amplifier (SOA) can
enhance this concept by optimally transferring the signal power to the shifted-filter's side of the spectrum. We also
provide a detailed optimization analysis of the filter's detuning and bandwidth by means of numerical simulations. In
this study, we consider an amplitude and phase noise degraded return to zero differential binary phase shift keyed signal
(RZ-DBPSK).
Photonic balancing - a scheme where logically opposite pulses derived from the two outputs of a delay-line demodulator
for phase shift keyed (PSK) signals counter-propagate in the saturated regime of a semiconductor optical amplifier
(SOA) - has been proven to enhance the receiver performance, e.g. in terms of decreased optical signal-to-noise-ratio
(OSNR) requirements for a given target bit error ratio (BER). Here, we extend the photonic balancing scheme towards a
new concept for a regenerative amplifier targeted at extending the reach and/or the number of subscribers in passive
optical networks (PON) in order to support major operators' plans to reduce the number of central offices and access
areas by approximately 90%. For a given target BER, we demonstrate experimentally (a) an 8-dB higher post-amplifier
loss tolerance, (b) an extended feeder line length (75 km) combined with high splitting ratio (10 layers) for a preamplified
version, and (c) high input power variation tolerance (> 30 dB burst-to-burst) in upstream direction as needed
for highly asymmetric tree structures.
This paper investigates serial 100 Gbit/s PM-RZ-DQPSK transmission in the presence of perturbations from neighboring
10 Gbit/s NRZ, 40 Gbit/s RZ-DPSK, and 40 Gbit/s RZ-DQPSK DWDM channels. It addresses the need to outline
upgrade paths of current hybrid DWDM systems equipped with 10 and 40 Gbit/s line cards towards 100 Gbit/s for
remaining channels. A numerical simulation approach is used to evaluate the signal quality of the central probe for
various DWDM channel constellations and power levels.
We present an optical receiver for RZ-DPSK signals that use photonic balancing. Photonic balancing is achieved through
pulse counter-propagation and collision in a saturated SOA. We explain the principles of photonic balancing and show
how it can lead to an improvement in RZ-DPSK detection by 3 dB, similar to electrical balancing. We also show how
this scheme can be used as a Mamyshev-type regenerator.
Conference Committee Involvement (1)
Metro and Data Center Optical Networks and Short-Reach Links
30 January 2018 | San Francisco, California, United States
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