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Lightwave Technology, Journal of

Issue 19 • Date Oct.1, 2009

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  • [Front cover]

    Publication Year: 2009 , Page(s): C1
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    Freely Available from IEEE
  • Journal of Lightwave Technology publication information

    Publication Year: 2009 , Page(s): C2
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  • Table of contents

    Publication Year: 2009 , Page(s): 4187 - 4188
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  • Efficient Sharing of Fixed Wavelength Converters in Clos-Type Wavelength Interchanging Cross Connects

    Publication Year: 2009 , Page(s): 4189 - 4197
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1189 KB) |  | HTML iconHTML  

    Several structures of sharing wavelength converters (WCs) have been proposed for wavelength interchanging cross connects, including share-per-node (SPN), share-per-link (SPL), and share-per-wavelength (SPW). Among them, SPN has the highest sharing efficiency but at the expense of a complex switch fabric. In this paper, we investigate the Clos-type SPN and SPL structures and propose a novel structure, which is termed as C-SPW, to share fixed WCs based on the Clos network. The comparative simulations show that the sharing of fixed WCs in C-SPW can achieve similar drop probability (DP) with the sharing of tunable ones in Clos-type SPN under synchronous uniform traffic. The reason is that the fixed WCs in C-SPW can be accessible by all incoming packets, instead of a subset of them. Furthermore, an analytical model is derived to calculate the DP and converter utilization rate when C-SPW is operated in a synchronous mode under uniform traffic. The proposed analytical model fits well with the simulation results. View full abstract»

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  • Traffic Load Distribution-Based Excess Bandwidth Allocation in Time-Division-Multiplexed PONs

    Publication Year: 2009 , Page(s): 4198 - 4208
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (761 KB) |  | HTML iconHTML  

    Time-division-multiplexed passive optical networks (TDM-PONs) have been successful solutions for providing the huge bandwidth needed for quadruple-play services in last-mile networks. In this paper, the effects of excess bandwidth provisioning applied to a reservation-based TDM are analyzed in detail, and noble adaptive excess timeslot provisioning (ETP) mechanisms are proposed in the interoptical network unit (ONU) and intra-ONU domain in the TDM-PONs. Using traffic load distribution information observed in an optical line termination (OLT), a proposed deficit reservation-based dynamic bandwidth allocation, called dr-DBA, controls the amounts of excess timeslot bandwidths in order to efficiently serve the burst traffic of heavy-loaded ONUs while guaranteeing strict fair link-sharing. The authors also introduce a service work-based ETP bandwidth reservation as well as an optimal reservation class selection mechanism to support prioritized service in an intra-ONU so that serious node light-load penalty and bandwidth overbooking can be minimized. The performance results achieved by numerical analysis and simulations prove that proposed ETP mechanisms provide fair and optimal excess bandwidths to the ONUs according to the changes in traffic load distribution, while compensating the systematic weakness of each mechanism in both ONU domains. View full abstract»

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  • Reducing Network Cost of Many-to-Many Communication in Unidirectional WDM Rings With Network Coding

    Publication Year: 2009 , Page(s): 4209 - 4220
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB) |  | HTML iconHTML  

    In this paper, we address the problem of traffic grooming in wavelength-division multiplexing rings with all-to-all and its generalization to many-to-many service by using network coding. We consider minimizing the number of line terminating equipment on two types of unidirectional rings, namely, single-hub and unhubbed rings, as our objective. In single-hub rings, we investigate the minimum cost provisioning of uniform all-to-all traffic in two cases: where network coding is used to linearly combine data, and where it is not used and data are transmitted without coding. We generalize the service mode to many-to-many and evaluate the cost of provisioning. In unhubbed ring, we propose a multihub approach to obtain the minimum cost provisioning in the case of all-to-all and many-to-many traffic. In each type of ring topology, two network scenarios are considered: first, the distinct communication groups in the ring are node-disjoint, and second, the different groups may have common member nodes. From our numerical results, we find that under many-to-many traffic pattern for both scenarios, network coding can reduce the network cost by 10%-20% in single-hub rings and 1%-5% in unhubbed rings in both network scenarios. View full abstract»

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  • 160 Gb/s Time-Domain Channel Extraction/Insertion and All-Optical Logic Operations Exploiting a Single PPLN Waveguide

    Publication Year: 2009 , Page(s): 4221 - 4227
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1150 KB) |  | HTML iconHTML  

    160 Gb/s all-optical signal processing is demonstrated exploiting pump depletion in addition to sum and difference frequency generation (SFG/DFG) in a single periodically poled lithium-niobate (PPLN) waveguide. 160 Gb/s time-domain extraction and insertion operations of channels are obtained in an optical time division multiplexing (OTDM) system. Moreover, 160 Gb/s digital operations including half-adder, half-subtracter and AND/OR/XOR functions are carried out. The use of pump depletion effect allows to process ultrafast signals due to its high efficiency and ultrafast dynamics. 160 Gb/s bit error rate (BER) measurements confirm the effectiveness of all presented functionalities. View full abstract»

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  • Experimental Demonstration of Optical DQPSK Receiver Based on Frequency Discriminator Demodulator

    Publication Year: 2009 , Page(s): 4228 - 4232
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (572 KB) |  | HTML iconHTML  

    This paper presents experimental data demonstrating a novel differential quadrature phase-shift keying receiver based on optical frequency discriminator demodulator with direct detection. The experimental results confirm theory, showing a factor of 2times enhanced tolerance to chromatic dispersion compared with a conventional delay-interferometer-based demodulator with balanced detection. The frequency discriminator direct detection receiver also shows a significant improvement in tolerance to Gordon-Mollenauer nonlinear phase noise. View full abstract»

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  • Characterization of All-Optical Regeneration Potentials of a Bistable Semiconductor Ring Laser

    Publication Year: 2009 , Page(s): 4233 - 4240
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1136 KB) |  | HTML iconHTML  

    All-optical pulse reamplification, reshaping (2R), and retiming (3R) using a monolithic bistable semiconductor ring laser (SRL) is demonstrated for the first time. The regeneration performance of the SRL is characterized with an all-optical settable switching threshold, achieving significant increases in the extinction ratio (ER) of the output pulse for input ER as low as 1 dB. For retiming, a rectangular retiming window generated by a clean clock signal is used to eliminate the timing jitter in the input pulse. For input pulse with peak-to-peak timing jitter as high as ~ 12% of the bit period, the timing jitter in the retimed output pulse is reduced to < 2% of the bit period. The pulsewidth of the final regenerated data can be controlled by changing the width of the retiming window. The SRL is, therefore, shown to have a "hard" digital performance in both amplitude and time domain suitable for all-optical 3R. View full abstract»

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  • A Study on Unconditionally Stable FDTD Methods for the Modeling of Metamaterials

    Publication Year: 2009 , Page(s): 4241 - 4249
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (842 KB) |  | HTML iconHTML  

    We assess the performance of three unconditionally stable finite-difference time-domain (FDTD) methods for the modeling of doubly dispersive metamaterials: 1) locally one-dimensional FDTD; 2) locally one-dimensional FDTD with Strang splitting; and (3) alternating direction implicit FDTD. We use both double-negative media and zero-index media as benchmarks. View full abstract»

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  • Sensor Multiplexing Based on a Finite-Impulse Response Lattice of Unbalanced Interferometers

    Publication Year: 2009 , Page(s): 4250 - 4255
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (615 KB) |  | HTML iconHTML  

    A new approach for multiplexing interferometric fiber optic sensors is described and studied. The approach is based on a lattice of unbalanced Mach-Zehnder interferometers. This configuration is inherently low-loss and can be implemented and deployed in a simple manner. The signals from the cascaded sensors are extracted from the measured data via a layer peeling algorithm. A fifth-order polarimetric implementation of the proposed multiplexing technique has been constructed and characterized. The third sensor was buried in a sandbox while the rest of the sensors were spooled on a bobbin. The system successfully separated and monitored the pressure variations in the different sensors with minor crosstalk. View full abstract»

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  • Investigation of Transparency of FWM in SOA to Advanced Modulation Formats Involving Intensity, Phase, and Polarization Multiplexing

    Publication Year: 2009 , Page(s): 4256 - 4261
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (960 KB) |  | HTML iconHTML  

    We experimentally investigate the real transparency of four-wave mixing (FWM) in semiconductor optical amplifiers to modulation formats involving intensity, phase, and polarization multiplexing. We exploit two different FWM polarization-independent schemes (that make use of two pumps) to wavelength-convert 40 Gb/s single-polarization and 80 Gb/s polarization-multiplexed signals in case of both nonreturn-to-zero ON -OFF keying (NRZ-OOK) and NRZ differential phase-shift keying modulation formats. We found that, although FWM conversion is transparent to modulation formats employing phase and intensity, polarization-multiplexed signals pose serious limitations to all-optical processing transparency. View full abstract»

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  • FEM Design and Modeling of \chi ^{(2)} Second-Harmonic Enhancement in Circular Photonic Crystal

    Publication Year: 2009 , Page(s): 4262 - 4268
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1347 KB) |  | HTML iconHTML  

    In this paper, we analyze the enhancement of ξ(2) nonlinear process in membrane-type circular photonic crystal (PhC) based on GaAs. This unconventional kind of PhC is well suited for the generation of whispering gallery modes (WGMs) due to the circular symmetric periodic pattern. By using a laser Gaussian beam at 1.55 μm as pump signal, a WGM at 1.55 μm and a second-harmonic (SH) mode at 0.775 μm are obtained. The SH will be generated in the center of the missing-hole microcavity. The periodic pattern and the microcavity are tailored and optimized providing an SH efficiency conversion as high as 50%. We predict the resonances by an accurate 2-D time-domain model including ξ(2) nonlinearity and by a 3-D finite-element method. Finally, by using a 3-D membrane configuration, we found a total quality factor of the SH mode of the order of 35 000. View full abstract»

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  • Offset Time Configuration in Optical Burst Switching Ring Network

    Publication Year: 2009 , Page(s): 4269 - 4279
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1175 KB) |  | HTML iconHTML  

    In this paper, a detailed burst header packet (BHP) processing model is presented to characterize the BHP processing time at the switch control unit of optical burst switching ring network. The distribution function of the total BHP processing delay, which is used to configure offset time, is derived based on the proposed model by using central limit, large deviation, and phase-type distribution theorem-based methods, respectively. A simulation platform that takes the practical processing delay of BHP into consideration is developed to evaluate the efficiency of the proposed model and mechanisms. Different distribution function-based offset time configuration mechanisms are analyzed and compared with the fixed offset time configuration mechanism in terms of burst loss ratio for insufficient offset time and average offset time deviation. The results show the validity of our model. View full abstract»

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  • Numerical Rate Equation Modeling of a {\sim {\hbox {2.1}}-}\mu{\hbox {m}}-{\rm Tm}^{3+}/{\rm Ho}^{3+} Co-Doped Tellurite Fiber Laser

    Publication Year: 2009 , Page(s): 4280 - 4288
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (681 KB) |  | HTML iconHTML  

    Judd-Ofelt analysis is performed on measurements of bulk samples of Tm3+- and Ho3+-doped tellurite glass from which the host-dependent Judd-Ofelt intensity parameters are extracted. These have then been used to calculate the radiative rates and branching ratios in this particular material system. A rate-equation approach is then used to model an experimentally realized ~2.1 μm Tm3+/Ho3+ codoped tellurite fiber laser and extract values of the energy transfer and upconversion rate parameters in TeO2-ZnO-Na2O (TZN) glass. Excellent agreement is found between simulated and experimental data, which indicates the validity of the approach. View full abstract»

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  • Dynamic Programmable Scheduling Mechanism of GEPON

    Publication Year: 2009 , Page(s): 4289 - 4296
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    With the development of the gigabit-Ethernet passive optical network (GEPON), the polling mechanism is widely used in allocating bandwidth of GEPON in order to solve the bottleneck problem of an access network. The polling mechanism is effective in GEPON bandwidth allocation. However, the mechanism has some problems of its own that are quite prominent and cannot be solved by the mechanism itself, such as the waste of time slot, waste of authorized window, waste of idle queue, and so on. This paper proposes a dynamic programmable scheduling mechanism that can effectively solve the problems of the polling mechanism. At the same time, the dynamic programmable scheduling mechanism can provide a greater degree of flexibility that enables service providers to decide, adjust, and achieve their own bandwidth allocation logic after the network is fixed. In addition, to a large extent, the proposed mechanism can promote interoperability among different GEPON systems. View full abstract»

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  • Multicarrier Light Source With Flattened Spectrum Using Phase Modulators and Dispersion Medium

    Publication Year: 2009 , Page(s): 4297 - 4305
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (521 KB) |  | HTML iconHTML  

    This paper describes a phase-locked multicarrier light source that employs a continuous wave (CW) light source, two phase modulators, and a dispersion medium. A sinusoidal phase modulation (PM) with a modulation index of ??/4 and a group velocity dispersion of ??1/(4??fm 2), where fm is the modulation frequency, are applied to a CW light followed by a large sinusoidal PM. This configuration provides a multicarrier light with a flattened optical power spectrum for any modulation index of the second PM. By adopting a chirped fiber Bragg grating (FBG) as a dispersion medium instead of a long normal dispersion fiber, we can increase the stability of the optical output spectrum and reduce the size of the multicarrier light generator. We have built a prototype with this configuration that generates a 61-carrier light with a 25 GHz interval and a power deviation of less than 8 dB. View full abstract»

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  • Optical Quality Improvement of Si Photonic Devices Fabricated by Focused-Ion-Beam Milling

    Publication Year: 2009 , Page(s): 4306 - 4310
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (739 KB) |  | HTML iconHTML  

    Focused-ion-beam directly milling strategy was used to fabricate photonic resonators on crystalline silicon-on-insulator substrate. In order to reduce damages such as implanting ions, amorphous layers and re-deposition process which are induced by the ions, a sacrificed silica layer was used as an etching mask and a silicon thermal oxidation process was performed. The transmission spectra of both photonic crystal cavities and micro-ring resonators were measured. The resulting data demonstrate that the Q factors are significantly improved after the oxidation treatment. View full abstract»

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  • A Seamless Evolution Method With Protection Capability for Next-Generation Access Networks

    Publication Year: 2009 , Page(s): 4311 - 4318
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1419 KB) |  | HTML iconHTML  

    We propose and demonstrate a seamless evolution method with protection capability for next-generation (NG) access networks. Both a time-division-multiplexing passive optical network (TDM-PON) and a wavelength-division-multiplexing (WDM-PON) can be accommodated in the same fiber infrastructure and failures of feeder fibers and distribution fibers are protected for each service. Remote reconfigurations of the remote node (RN) for protection and/or evolution can be achieved within 48 ms by instantaneous optical powering at the central office (CO) while maintaining the RN in a passive state. View full abstract»

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  • System Performance of High-Order Optical DPSK and Star QAM Modulation for Direct Detection Analyzed by Semi-Analytical BER Estimation

    Publication Year: 2009 , Page(s): 4319 - 4329
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1169 KB) |  | HTML iconHTML  

    Recently, higher order modulation formats are intensively investigated to further increase spectral efficiency for building next generation optical transport networks. Direct detection receivers are capable of detecting arbitrary modulation formats with differentially encoded phases such as differentially phase shift keying (DPSK) and star shaped quadrature amplitude modulation (Star QAM) formats. In an earlier publication of the authors (M. Seimetz , ??Optical systems with high-order DPSK and star QAM modulation based on interferometric direct detection,?? J. Lightw. Technol. , vol. 25, no. 6, pp. 1515-1530, Jun. 2007) a system analysis was performed where performance was mainly characterized by eye opening penalties. Here, these investigations are extended. A tool for semi-analytical BER estimation is developed allowing to calculate the BER down to small values such as 10-9 for a wide range of modulation formats, as well as for different receiver structures. Using this module, the back-to-back OSNR requirements are calculated. CD and SPM tolerances are characterized by optical signal-to-noise ratio (OSNR) penalties at BER = 10-9 . As far as the authors know, this is the first analysis of the transmission characteristics of optical 16DPSK and Star 16QAM based on the BER. Moreover, further novel aspects such as optimization of the optical and electrical receiver filter bandwidths are investigated. View full abstract»

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  • Two-Dimensional Ferroelectric Photonic Crystal Waveguides: Simulation, Fabrication, and Optical Characterization

    Publication Year: 2009 , Page(s): 4330 - 4337
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1533 KB) |  | HTML iconHTML  

    The optical properties of two dimensional photonic crystal (PhC) waveguides were investigated using ferroelectric barium titanate (BTO) thin films as the optical medium. The photonic band structure was calculated using a 2-D finite difference time domain (FDTD) method; a broad band gap is observed that results from the high refractive index contrast. The simulated transmission spectra indicate the stop band of PhC is mainly determined by three parameters: lattice constant, refractive index contrast, and waveguide mode order. From transmission measurements the PhC with a lattice constant a = 420 nm shows a strong light dispersion and the other PhC with a = 450 nm shows a 120-nm broad stop band. Strong localization of visible light within the PhC cavities is demonstrated from the light scattering images. The observed strong light confinement and its spatial intensity profile due to resonance agree with the calculated profiles. From polarized optical microscopy we discovered the scattered light wavelength was highly sensitive to magnitude of the lattice constant. The optical scattering properties indicate BTO PhC can potentially serve as micrometer size electro-optically tunable switches and color filters. View full abstract»

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  • Accounting for Shared Regenerators in GMPLS-Controlled Translucent Optical Networks

    Publication Year: 2009 , Page(s): 4338 - 4347
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (875 KB) |  | HTML iconHTML  

    In translucent optical networks, the usage of sparse opto-electronic regenerators permits to overcome optical signal quality degradations. In dynamic translucent optical networks, where lightpaths are established upon request, regenerators can be effectively time shared. However, the current generalized multiprotocol label switching (GMPLS) protocol suite does not consider how to dynamically reserve and release shared regenerators and how to distribute regenerator availability information to network nodes. In this paper, four Translucent Lightpath Dynamic Provisioning (TLDP) schemes are proposed to establish lightpaths in dynamic distributed translucent optical networks. TLDP schemes differently combine the utilization of specific open shortest path first-traffic engineering (OSPF-TE) or resource reservation protocol-traffic engineering (RSVP-TE) extensions and shared regenerator availability information. Simulation results show that TLDP scheme based on OSPF-TE extensions obtains lower lightpath setup time, but higher control plane load than TLDP schemes based on RSVP-TE extensions. Moreover, schemes based on RSVP-TE extensions or on OSPF-TE extensions obtain the same lowest blocking probability. View full abstract»

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  • Multirate, Differentiated-QoS, and Multilevel Fiber-Optic CDMA System via Optical Logic Gate Elements

    Publication Year: 2009 , Page(s): 4348 - 4359
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1042 KB) |  | HTML iconHTML  

    In this paper, we present a novel multirate, differentiated quality of service (QoS) optical CDMA (OCDMA) system using multilevel signaling technique. The emphasis is on OCDMA systems employing multi-length variable-weight optical orthogonal codes (MLVW-OOC) as signature sequence. We begin by presenting a two-class variable-weight OCDMA system in which all users have the same energy level in one bit duration. As a consequence, high weight users transmit their corresponding optical pulses at a lower power while low weight users transmit their corresponding optical pulses at a higher power level. We show that using this multilevel signaling technique, while employing the well known optical AND logic gate receiver structure, we achieve a considerable improvement in the performance of low-weight (high-power) users while the performance of high-weight (low-power) users not altered in comparison to one-level system. In the next step, we indicate that by using the recently introduced multistage receiver structure, which employs advanced optical logic gate elements, interferences at different power levels are distinguishable so that the performance of both high-weight and low-weight users are improved. Furthermore, we employ multilevel signaling technique in OCDMA system based on MLVW-OOC (multirate, differentiated QoS system). We show that using multilevel signaling technique in such a system results to the performance improvement. To analyze the performance of the system we obtain a closed-form relation expressing an upper bound on the probability of error of the system. Finally, to validate the upper bound, the analytical results are compared to the results of system simulation. The numerical closeness between the analytical and system simulation reveals the tightness of the obtained upper bound, hence making them quite useful in evaluating the above system's performance. View full abstract»

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  • In-Line Fabry–Perot Etalons Based on Hollow-CorePhotonic Bandgap Fibers for High-Temperature Applications

    Publication Year: 2009 , Page(s): 4360 - 4365
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (834 KB) |  | HTML iconHTML  

    In this paper, we report a novel in-line fiber Fabry-Perot (F-P) etalon, consisting of a section of hollow-core photonic bandgap fiber (HC-PBGF) spliced between two single mode fibers. The fabrication process of such a sensor is simple and straightforward, including only cleaving and splicing. The sensing characteristics of the F-P etalon based on HC-PBGF, including high temperature, strain, bend, and transverse load, are fully investigated by experiments, for the first time to our knowledge. It is found that such a F-P etalon can be used under high temperatures of up to 600??C, and has a low cavity-length-to-temperature sensitivity of ~ 1.4 nm/??C, while it has a relatively high strain sensitivity of ~ 5.9 nm/????. Moreover, this F-P etalon is insensitive to bend or transverse load. Furthermore, the long cavity length (> 1 cm) of the sensor makes it suitable for multiplexing. These characteristics would make this HC-PBGF-based F-P etalon to be an excellent strain sensor or gas sensor for use in high-temperature environments. View full abstract»

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  • Study of Component Crosstalk and Obtaining Optimum Detection Threshold for Minimum Bit-Error-Rate in a WDM Receiver

    Publication Year: 2009 , Page(s): 4366 - 4373
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (643 KB) |  | HTML iconHTML  

    In this paper, bit error rate and power penalty in a WDM receiver system in the presence of component crosstalk with finite interferers are studied using a simplified analysis and some optimum detection thresholds are suggested for minimum bit error rate. Error probabilities are calculated considering a unipolar bit stream of optical signals at the receiver input. Probability density function in the presence of crosstalk deviates from conventional Gaussian function. Effects of receiver noise, number of interfering channels and crosstalk levels on the receiver performance are shown. Optimum detection thresholds for minimum bit error rates in the WDM receiver in presence of component crosstalk are investigated and summarized in tabular form. View full abstract»

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Aims & Scope

The Journal of Lightwave Technology contains articles on current research, applications and methods used in lightwave technology and fiber optics.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Peter J. Winzer
Alcatel-Lucent Bell Labs