We demonstrate the detection of speech signals and footsteps through a novel polarization-multiplexed coded differential-phase OTDR (optical time domain reflectometry) interrogation standard telecom fibers in different configurations. assess sensitivity to audio by measuring induced phase variation with respect sound pressure level perturbation, manage detect acoustic high reliability. Further experiments are performed using an installed fiber cable showing ability track indoor scenario....

Newly introduced polarization diversity probing codes are suggested to enhance the sensitivity and bandwidth performance of differential phase-sensitive distributed OTDR systems. This was recently demonstrated by means short-length specialized fibers with a backscattering induced equally spaced Fiber Bragg Gratings inserted in fiber itself. The work summarized this letter aims extend polarization-diversity technique widely spread standard single mode (SSMF) used for telecommunications,...

Monitoring the optical phase change in a fiber enables wide range of applications where fast variations are induced by acoustic signals or vibrations general. However, quality estimated response strongly depends on method used to modulate light sent and capture field. In this paper, we show that distributed sensing systems can advantageously exploit techniques from telecommunication domain, as those coherent transmission, enhance their performance detecting mechanical events, while jointly...

We propose a novel interrogation technique for Distributed Acoustic Sensing (DAS) and demonstrate the detection recognition of multiple vibration events over 50 km SSMF. A differential-phase optical time-domain reflectometry (Δφ-OTDR) approach is used. At transmitter side, continuous ultra-narrow-linewidth laser modulated with polarization-multiplexed orthogonal binary sequences at receiver back-scattered signal captured through polarization-diversity coherent mixer in self-homodyne...

We report detection-localization-identification of true mechanical events on a buried fiber cable up to 82km SSMF using digital sensing system copropagating with adjacent 600Gb/s WDM channels. Non-intrusive coexistence channels is demonstrated.

Nowadays, long distance optical fibre transmission systems use polarization diversity multiplexed signals to enhance performance. Distributed acoustic sensors (DAS) the same propagation medium, i.e., single mode fibre, and aim at comparable targets such as covering highest with best signal quality. In case of sensors, a noiseless enables us monitor large quantity mechanical events along fibre. This paper aims extending perspectives DAS regard technology breakthroughs introduced in haul over...

The authors consider the time and frequency resolutions associated with wavelet transform since these resolution properties are essential to evaluate a time-frequency analysis tool. A method is introduced measure of orthonormal wavelets. exploit degree freedom in construction compactly supported wavelets order find ones which yield highest concentration. It shown that some get close Heisenberg limit, makes corresponding particularly appropriate signal analysis.< <ETX...

We demonstrate the detection and localization of perturbations induced by a jackhammer an excavator over buried fiber cable from operational optical network thanks to high sensitivity Multiple-Input-Multiple-Output digital sensing.

Coherent technology developed in the past decade for transmission over core optical networks has leveraged fiber capacity with introduction of polarization diversity I/Q modulation along advanced signal processing. Meanwhile, Distributed Acoustic Sensing (DAS) telecom infrastructure recently gained interest, and its deployed in-depth supervision becomes a desirable feature operators. This paper intends to show that combination coherent solutions digital processing techniques implemented...

This paper investigates the potential reduction of energy consumption in core optical network by introducing within nodes an intermediate cross connect between optoelectronic devices and router. By bringing both efficiency flexibility at same time, solution is suitable for shaping evolution networks over mid long term towards shifting patterns dynamic resources use. The benefits power proposed are investigated through simulations compared to alternatives currently implemented nodes.

Differential phase optical time-domain reflectometry is subject to Rayleigh fading, which locally impedes proper extraction. We introduce in this Letter a reliability metric derived from the measured Jones matrix estimates of fiber sensor discriminate between true perturbations and false alarms caused by backscatter fading points. The proposed soft-decision also interest for further post-processing stages exploiting artificial intelligence based classifiers.

We present a WDM transponder that balances the power between SD-FEC receiver and Chromatic Dispersion compensator according to selected modulation format. Simulations show DSP gains of 31% at scale continental network.

From Distributed Acoustic Sensing (DAS) measurements over deployed Multi-Core Fiber (MCF), we discuss several signal processing options to enhance the sensing sensitivity, namely core combination and longitudinal averaging.

We introduce a coherent-MIMO Δϕ-OTDR based sensing technique that uses digital frequency division multiplexing of probing codes in order to mitigate the coherent fading issue Δϕ-OTDR. Orthogonal (OFDM) is used probe optical channel on several electrical subcarriers, and their responses are then combined according specific reliability criterion enhance overall sensitivity. This allows for decrease noise floor measurements standard single mode fiber (SSMF) mitigation false alarms. Coherent...

We investigate the power consumption of IP-over-WDM networks for 100G coherent systems when varying optical reach values. Benefits optimal depends on slope reach-related function. also show that "greening" transponders has a linear-like impact reduction network consumption.

We introduce a phase-OTDR multi-resolution approach to detect mechanical events through telecom fibers. Perturbations are first coarsely localized from subset of high-reflecting backscatters, followed by low complexity localization refinement.

A dual-polarization model of Rayleigh backscattering for telecom fibers is developed. The noise standard deviation over distance estimated from phase-OTDR simulation matches experimental results when accounting the laser source phase noise.

Comparing recent nonlinear timing error detectors to Gardner reference method for root-raised-cosine pulses, we show that outperforms them roll-off factors down 0.05 in presence of transmission impairments such as optical noise and residual chromatic dispersion.

We propose new polarization-coded binary sequences based on complementary codes to enhance the performance of FBG-based sensor arrays. Speech signals are sensed from optical phase with linear magnitude and frequency responses up 18 kHz.

We demonstrate the identification of an acoustic perturbation made a 6kHz bandwidth speech signature reaching 1km long SMF. The fiber is probed with phase-OTDR over two orthogonal polarization axes and backscattered signal received by polarization-diversity coherent mixer (MIMO sensing) which mitigate fading effects.

When digitally compensating for chromatic dispersion in coherent systems, we propose to adjust the number of operations according each lightpath requirement so as save energy through DSP power scaling. We achieve savings up 77% (resp. 57%) into compensation stage, when considering a core network scenario at 100 200) Gb/s.

We propose to implement bit-level network coding with novel multiflow regenerators in bidirectional links. Our are designed send two different messages out of a single transmitter. Simulations show an estimated ~20% equipment cost reduction at same performance.

Multiple input multiple output (MIMO) distributed fiber Sensing (DFS) is an innovative digital approach to phase-OTDR derived from technologies used in long-haul transmission over both terrestrial and submarine telecom networks. The probing signal composed of codes that modulate phase a highly coherent laser source two orthogonal polarization axes, the Rayleigh backscattered optical field captured by mixer set homodyne configuration. This technique estimates, after processing, without fading...