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Optical fiber is the required technology for Radio Access Network (RAN) backhaul and fronthaul. We report the evolution of RAN equipment including the advent of virtualization and an investigation of the required architecture and optical access technologies.
We propose a passive architecture mixing G-PON and VDSL2 technologies. We evaluate a single-user per port FTTdp prototype providing up to 100Mbit/s bidirectional bit rate per customer over 100m from the distribution point.
The high-order Quadrature Amplitude Modulation (QAM) of a III–V-on-Silicon laser is achieved for the first time, through Orthogonal Frequency Division Multiplexing (OFDM), allowing a 12.6Gb/s-transmission with a 4GHz-bandwidth.
We experimentally assess the limitations of IM/DD WDM-FDMA-OFDM with a single photodetector. We show that the laser chirp will influence the minimum separation between wavelengths and also the frequency response of a dispersive channel.
A WDM-PON system based on self-seeded RSOA is evaluated to provide long reach and high bit rate. For the first time, a maximum reach of 90km and a maximum bitrate of 4.9Gbit/s are achieved.
We experimentally investigate the influence of the intensity modulation index of an OFDM signal submitted to propagation through a dispersive fiber and direct detection at the receiver. We evaluate the role of the parasite phase modulation component created by the laser chirp and its influence on the system's in-band and out-of-band noise.
Energy saving is compared for long reach PONs using passive or active scenarios. Inserting active equipments such as Extender Boxes lead to energy saving when the number of COs and filling ratio are optimized.
We report the performance of a chirped laser in IMDD-based transmissions and we show that the interplay between laser chirp and fiber dispersion can be very attractive for long distance PONs if adaptive OFDM modulation is used.
We compare the performances of IMDD AMOOFDM transmissions in both amplified and unamplified configurations for long distance PON networks with 1:32 and 1:64 split ratios. Up to 40 Gb/s bit rate has been demonstrated.
Adaptively modulated optical orthogonal frequency division multiplexing (AMOOFDM) modulation is experimentally evaluated using different photodiodes. A comparison is made between positive-intrinsic-negative (pin) and avalanche photodiode (APD) receivers in next generation passive optical network (NG-PON) downlink architecture. Direct modulation in transmission as well as direct detection in reception...
We experimentally demonstrate AMOOFDM transmissions at 11.5Gb/s over 513km uncompensated standard single mode fiber (SSMF) and 30Gb/s over 650km dispersion managed fiber (DMF) through intensity modulation and direct detection.
This paper presents a view of the trends and perspectives in the next generation of optical access solutions following the 10Gbit/s Passive Optical Networks.
Fiber dispersion coupled with chirp parameter of the emitting laser impacts the optical transmission system performance. Fiber dispersion causes the propagating pulses to spread and overlap, and the chirp parameter produces a wavelength shift arising from the intensity variation of the directly modulated laser (DML). For optical transmission systems, orthogonal frequency division multiplexing (OFDM)...
A wide-band SOA is used for amplification of both downstream signals from G-PON and 10G-PON access networks. BER measurements showed a performance of 42dB on optical budget but also pointed out requirements on the SOA to improve this performance.
We experimentally demonstrate the feasibility of TDMA Adaptively Modulated Optical OFDM (TDMA-AMOOFDM) with two directly-modulated low-bandwidth VCSELs at 1310nm and an APD originally designed for continuous transmissions.
Experimental demonstration of a bit rate as high as 32 Gbit/s is achieved over 20 km SMF for NGPON in a temperature range of 5??C-60??C using AMOOFDM direct modulation of a linear laser.
Multi-band power allocation for NG-PON downlink transmission is experimentally demonstrated when implementing AMOOFDM with direct modulation of a linear laser. Multi-user power and bit-allocation allows the users datarates to be balanced according to a target QoS.
A bit rate as high as 19Gbit/s transmission was experimentally demonstrated for NG-PON without chromatic dispersion compensation by direct modulation of DFB laser using DMT signal combined with adaptive power-bit loading algorithm.
An OFDM transmission system is amplified through SOA or EDFA to provide an access network at 10Gbit/s with increased optical budgets. Bit-rate optimization and BER measurement characterize amplifier's behaviour with OFDM signals for access network.
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