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We probe the limits, both experimentally and analytically, of passive optical network (PON) monitoring using periodic coding technology. The experimental demonstration focuses on a 16 customer PON with a 20 km feeder fiber followed by either a single cluster or a tiered hierarchy. A directly modulated laser modulated at 1 GHz was used to generate the monitoring probe signals. The measured data from...
We introduce digital lightpath labeling for DP-QPSK transmission, using novel binary encoding to embed a polarization-shift-keyed subchannel. An integrated inline polarimeter powers a compact label receiver with robust tolerance to polarization rotation in a 40Gb/s demonstration.
We propose and demonstrate a 1.25-Gb/s RSOA-based WDM PON employing a novel self-homodyne receiver. The proposed receiver enables the excellent receiver sensitivity and reflection tolerance, and has potential applications in the long-reach WDM PON with high-split ratio.
We report the development of ultrasensitive photoreceivers, based on ultra high gain and low excess noise APDs, with sensitivities of -35.5 dBm at 2.488 Gbps and 10-10 BER and the potential for 6-12 dB sensitivity enhancement at higher bit rates. Current APD devices are not capable of simultaneous high gain and low noise. The developed APD detectors enable the achievement of optimum sensitivity at...
A burst-mode receiver using high-power-tolerant APD for co-existence of 10-/1 Gbps-PON systems was demonstrated. An inter-burst dynamic range as large as 25 dB for both 10 and 1 Gbps at a fixed APD bias voltage was attained.
We propose a novel 9b10b line code suitable for the XG-PON1 2.5Gb/s upstream. It provides a good balance of line conditioning and efficiency. We show that this line code outperforms the scrambled NRZ code.
An OLT receiver that includes a semiconductor optical amplifier, a ldquosoftrdquo optical filter and a PIN photodiode has significantly higher sensitivity, and lower complexity than avalanche photodiode-based OLT receivers.
We successfully demonstrate a digital lightpath labeling technique, LightLabel, for DPSK. Two DPSK modulation schemes and OOK are compared experimentally. The technique offers cost-effective lightpath management for photonic networks.
This is the first 2.5 Gb/s burst-mode receiver that satisfies GPON timing specification. The single-chip receiver IC archives -25.5 dBm sensitivity, 21 dB dynamic range, 18.5 dB loud/soft ratio with p-i-n photodiode.
We propose and experimentally demonstrate a novel coding scheme for a WDM-PON system using ASK/DPSK re-modulation corresponding to downstream/upstream signals respectively to enhance the toleration of injection signal extinction ratio.
We investigate 10-Gb/s uncooled, directly modulated free-running 1.55-mum VCSEL transmission for WDM-PONs. Wavelength variation with bias current and dispersion tolerance are evaluated for WDM-PON transmission. Errorfree transmission over 10-km SMF and 80-km SMF+DCF have been demonstrated.
In this study the author has modeled and characterizes the performance of 3times10 Gbp/s absolute polar duty cycle division (APDCDM) multiplexing in dispersive environments at 1550 nm. APDCDM technique is examined, with comparison to non-return-to-zero (NRZ) and return-to-zero (RZ) time division multiplexing. In this paper three channel operating at the same speed of 10 Gbps are multiplexed in electrical...
In this paper, we study bandwidth management of a wireless/optical based access/metro network in support of voice and data services. For voice services, we use a finite state Markov Chain to estimate the blocking probability of voice circuits over an Adaptive modulation and coding wireless channel, as a function of the channel parameters. For data services, we evaluate a rate matching and a buffer...
In conventional optical data transmission schemes, electrical filters and/or optical filters are used to improve the quality of system performance. In this paper, improved design of dense wavelength division multiplexing (DWDM) optical systems is achieved by using a selective electrical filter assignment method. The methodology objective is to optimize system design and mitigate the effects of fiber...
Optical communication systems based on dense wavelength division multiplexing (DWDM) would benefit from the ability to adjust the operating wavelength of a laser transmitter. Previous attempts, including thermal adjustment, etalon based wavelength locking, and various types of optical frequency and phase locked loops such as the Pound-Drever-Hall technique suffer from weaknesses including sensitivity...
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