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The EU FP7 ERMES project focused on the development of a wavelength division multiplexed passive optical network (WDM PON) colourless self-tuning transmitter based on reflective semiconductor optical amplifiers (RSOAs) self-seeding. These transmitters represent low cost solutions to achieve self-organized wavelength access networks. The EU ERMES project developed self-tuning transmitters both in the...
To avoid the bandwidth expansion of the optical digital fronthaul, recently it has been demonstrated that pulse-width modulation (PWM) is a viable solution for the analog optical fronthaul, as an alternative to standard radio over fiber. The PWM encodes the analog samples at the transmitter onto the duration of the on–off keyed optical signal, splitting the sampling and quantization of the radio signal...
Pulse width modulation for optical C-RAN fronthauling of 100-MHz bandwidth LTE-A signals is proved for the first time in a colorless self-tuning WDM PON, exploiting broadband-seeded RSOAs. Transmission up to 20-km SSMF is experimentally demonstrated.
Recently it has been demonstrated that pulse width modulation (PWM) can represent a viable solution for the analog optical fronthaul alternative to standard radio over fibre, which still avoids the bandwidth expansion of the digital fronthaul. The PWM encodes the analog samples at the transmitter onto the duration of the on/off keyed optical signal, splitting the sampling and quantization of the radio...
Pulse width modulation (PWM) has recently been proposed for analog optical fronthauling in centralized radio access networks (CRANs) to avoid the bandwidth expansion of digital fronthauling (e.g., common public radio interface protocol, CPRI). At the transmitter, the radio-signal is mapped onto the duration of an on/off keyed optical signal, while at the fiber receiving-end each PW optical modulated...
We propose a novel colourless self-tuning WDM PON multilevel transmitter based on self-seeding in two RSOAs co-located at the ONU in a twofold retracing circuit. We demonstrate its operation up to 20 Gb/s with BER below the FEC limit.
GEth, CPRI and 10 Gbit/s transmissions are experimented using amplified and standard self-seeded RSOA WDM PON systems. A field trial setup was exploited to test the system performance in terms of reach and optical budget.
A different approach, focusing both on the power build-up and the optical spectrum build-up of the RSOA-based self-seeded transmitter, uncovers that steady-state is reached later than expected. Initial roundtrips are analysed to enlighten the mechanism of radiation formation from ASE.
We experimentally evaluate burst-mode operation of an RSOA-based self-seeded transmitter at 2.5 Gb/s by recognizing, during the cavity build-up, different evolution of the optical power, which reaches steady-state faster than the spectrum. BER curves explore both initial and full-regime roundtrips.
An innovative architecture for access PONs is proposed to exploit the capabilities of coherent OFDM in terms of efficient use of the spectrum and fine granularity in flexible resource sharing, but maintaining simple implementation. The solution is based on the reliance on electronic DSP for the generation of the OFDM-modulated subcarriers at the transmitter and on the FFT implementation at the remote...
We present an experimental analysis on externally seeded colourless transmitters for WDM PON. We take advantage of direct modulation of a high performance MQW RSOA. Chirp is analysed as main limiting factor to SSMF propagation at 10 Gb/s. We demonstrate that off-set filtering performed by the OLT demultiplexer allows to cope with chromatic dispersion impairments and to bridge 24-km SSMF at 10 Gb/s...
10-Gb/s operation of a network-embedded self-tuning transmitter exploiting a high-PDG RSOA in a polarization preserving configuration based on two-Faraday rotators, is demonstrated bridging up to 52 km of NZD- fibre. The dispersive load tolerance is finally analysed.
Brillouin scattering effect in a colorless 25-km bidirectional WDM PON is experimentally evaluated. Downstream 10-Gb/s DPSK signal is directly received with a novel FBG, seeding an R-SOA at the ONU, for upstream 1.25-Gb/s OOK transmission.
A network-embedded self-tuning cavity is proved in WDM-PON transmission over 32 channels, with two-ONU simultaneous operation and downstream signal. Performance at 1.25 Gb/s are experimentally analyzed after 25 km and 50 km SSMF.
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