By Topic

Lightwave Technology, Journal of

Issue 23 • Date Dec.1, 2011

Filter Results

Displaying Results 1 - 22 of 22
  • [Front cover]

    Publication Year: 2011 , Page(s): C1
    Save to Project icon | Request Permissions | PDF file iconPDF (367 KB)  
    Freely Available from IEEE
  • Journal of Lightwave Technology publication information

    Publication Year: 2011 , Page(s): C2
    Save to Project icon | Request Permissions | PDF file iconPDF (38 KB)  
    Freely Available from IEEE
  • Table of contents

    Publication Year: 2011 , Page(s): 3491 - 3492
    Save to Project icon | Request Permissions | PDF file iconPDF (158 KB)  
    Freely Available from IEEE
  • Experimental Demonstration of Optical Retiming Using Temporal Soliton Molecules

    Publication Year: 2011 , Page(s): 3493 - 3499
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1153 KB) |  | HTML iconHTML  

    We experimentally demonstrate optical retiming of a 10.7 Gb/s data stream utilizing the property of bound soliton pairs (or “soliton molecules”) to relax to an equilibrium temporal separation after propagation through a nonlinear dispersion alternating fiber span. Pulses offset up to 16 ps from bit center are successfully retimed. The results of the experiment are in agreement with numerical simulations. An enhanced version of this retiming scheme is analyzed using numerical simulations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • One-Dimensional Off-Chip Beam Steering and Shaping Using Optical Phased Arrays on Silicon-on-Insulator

    Publication Year: 2011 , Page(s): 3500 - 3505
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (744 KB) |  | HTML iconHTML  

    Optical beam steering can find applications in several domains such as laser scanning, LiDAR (Light Detection And Ranging), wireless data transfer and optical switches and interconnects. As present beam steering approaches use mechanical motion such as moving mirrors or MEMS (MicroElectroMechanical Systems) or molecular movement using liquid crystals, they are usually limited in speed and/or performance. Therefore we have studied the possibilities of the integrated silicon photonics platform in beam steering applications. In this paper, we have investigated a 16 element one-dimensional optical phased array on silicon-on-insulator with a field-of-view of 23. Using thermo-optic phase tuners, we have shown beam steering over the complete field-of-view. By programming the phase tuners as a lens, we have also shown the focusing capabilities of this one-dimensional optical phased array. The field-of-view can easily be increased by decreasing the width of the waveguides. This clearly shows the potential of silicon photonics in beam steering and scanning applications. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Novel All-Optical Frequency-Encoded Method to Develop Arithmetic and Logic Unit (ALU) Using Semiconductor Optical Amplifiers

    Publication Year: 2011 , Page(s): 3506 - 3514
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1310 KB) |  | HTML iconHTML  

    An all-optical arithmetic and logic unit is the integral part of optical computing and data processing. In this paper, the author proposes a method to develop an all-optical arithmetic and logic unit by means of which so many binary logic operations such as AND, OR, NAND, NOR, EXOR, data comparator etc., as well as some arithmetic operations, such as half-addition, half-subtraction, full-addition, full-subtraction multiplication, etc., can be performed by properly selecting the frequencies of the control signals and using the frequency encoded input data. For this purpose, the author has exploited the frequency conversion scheme of semiconductor optical amplifier (SOA) using nonlinear polarization rotation character of the probe beam in SOA and, cross-gain modulation character of reflecting semiconductor optical amplifier (RSOA). Frequency-dependent optical beam routing to different channels have done using optical add/drop multiplexer made of SOA with multiquantum well structure. Frequency conversion efficiency of SOA and RSOA are very high as well as switching speed of SOA is very fast with very good ON-OFF contrast ratio. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Wavelength Multicasting via Frequency Comb Generation in a Bandwidth-Enhanced Fiber Optical Parametric Mixer

    Publication Year: 2011 , Page(s): 3515 - 3522
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1154 KB) |  | HTML iconHTML  

    We demonstrate a self-seeded multicasting device capable of delivering a large number of signal integrity preserving spectrally-distinct copies. The new multicasting device relies on efficient higher-order mixing in a two-pump parametric mixer. Precise dispersion engineering was deployed to generate a frequency-comb spanning over a 140-nm band, and resulted in the creation of more than 60 spectral copies of the signal with conversion efficiencies higher than -3 dB. The fidelity of the multicasting device with respect to signal intensity and phase was characterized experimentally. The spectral replication process was found to induce low penalty with both ON-OFF and differential phase-shift keying signals, thereby indicating compatibility with arbitrary amplitude/phase signaling formats. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Efficient Wavelength Conversion in Optimized SOI Waveguides Via Pulsed Four-Wave Mixing

    Publication Year: 2011 , Page(s): 3523 - 3535
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2912 KB) |  | HTML iconHTML  

    In this paper a detailed investigation of Four Wave Mixing in Silicon-on-Insulator optical waveguides is carried out under pulsed regime. A number of nonlinear effects, such as two photon absorption, free carrier absorption, self and cross phase modulation are considered in the analysis, as well as walk-off, group velocity dispersion and third order dispersion. The interesting influence of pulsewidth on the space-time evolution of both signal and idler pulses is presented. Optimized phase matching conditions are found to achieve very efficient wavelength conversion in parametric amplification, considering both degenerate and non degenerate processes. Finally, waveguide parameters are optimized for rib and membrane SOI waveguides. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Wavelength-Selective Ti:LiNbO _{3} Multiple Y-Branch Coupler Based on Focused Ion Beam Milled Bragg Reflectors

    Publication Year: 2011 , Page(s): 3536 - 3541
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (832 KB) |  | HTML iconHTML  

    This paper described a wavelength-selective couplers dedicated to drop functionality (spectral-selective couplers dedicated to wavelength demultiplexing). It is consist of two Y junctions: an input two drop channels and an output. The Y-branches distributors of optical power were carried out by a specific geometry of Ti:LiNbO3 waveguides. Each Y junction is composed by two identical bends jointed at one with a weak inclination angle to decrease losses. On each arm of the Y-branches, a Bragg grating (BG) is etched by Focused Ion Beam (FIB) in order to extract a specific wavelength band. A two-channel configuration is adopted which demonstrate a drop functionality of two spectral bands centered at 1123 nm and 1527 nm. The complementary spectrum is avalaible at the coupler output. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Single Passband Microwave Photonic Filter With Continuous Wideband Tunability Based on Electro-Optic Phase Modulator and Fabry–Pérot Semiconductor Optical Amplifier

    Publication Year: 2011 , Page(s): 3542 - 3550
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (658 KB) |  | HTML iconHTML  

    We propose and experimentally demonstrate a microwave photonic filter based on an electro-optic phase modulator (EOPM) and a Fabry-Pérot semiconductor optical amplifier (FP-SOA). A microwave photonic filter with a single passband between 0 and 40 GHz is obtained. In the single passband microwave photonic filter, the microwave subtraction effect is introduced in optical domain to improve the performance. A theoretical model is established to describe the operation principle of the microwave photonic filter, and the predicted results show good agreement with the experimental results. In the experiment, the center frequency and the 3-dB bandwidth are 18.3 GHz and 99.5 MHz, respectively, with the corresponding Q factor of 184, and the rejection ratio and shape factor are 34.3 dB and 5, respectively. The continuous wideband tunability of the microwave photonic filter is also demonstrated by adjusting the bias current of FP-SOA. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Phase and Amplitude Stability of EHF-Band Radar Carriers Generated From an Active Mode-Locked Laser

    Publication Year: 2011 , Page(s): 3551 - 3559
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1281 KB) |  | HTML iconHTML  

    We study the phase and amplitude stability of RF signals, generated at different frequencies by heterodyning pairs of modes from the optical spectrum of an active mode-locked laser, and we focus on the dependence of noise on the RF frequency. A specific theoretical model is derived, and the amplitude and timing jitter behaviour of the RF signals are analyzed and experimentally validated. The timing jitter reveals to be constant at any RF generated frequency, making the considered RF generation method suitable for the realization of flexible and highly stable micro- and millimeter-wave coherent radar transceivers. The performance of the considered RF generation architecture are compared with a state-of-the-art RF synthesizer, proving that the optically generated RF signals meet the high stability requirements of the new generation of coherent radar systems, even at extremely high frequencies (EHF). View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Two-Octave Spanning Supercontinuum in a Soft Glass Photonic Crystal Fiber Suitable for 1.55 \mu m Pumping

    Publication Year: 2011 , Page(s): 3560 - 3565
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB) |  | HTML iconHTML  

    In this paper, we present the results of a two-octave spanning supercontinuum (1000-3200 nm) generated in a highly nonlinear photonic crystal fiber that can be fabricated using a stack-and-draw process with SF57. The fiber can be pumped at 1.55 μm using a commercially available laser source with an average power of 5 mW. The fiber has two zero dispersion wavelengths at 1388 and 2068 nm with very high nonlinearity (~500 W-1 km-1 at 1550 nm). View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fabrication of Polymer Waveguides by Laser Ablation Using a 355 nm Wavelength Nd:YAG Laser

    Publication Year: 2011 , Page(s): 3566 - 3576
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1858 KB) |  | HTML iconHTML  

    The demand for optical waveguides integrated into Printed Circuit Boards (PCBs) is increasing as the limitations of copper interconnects for greater than 10 Gb/s data rates are being reached. Optical polymer materials offer a good solution due to their relatively low cost and compatibility with traditional PCB manufacturing processes. Laser ablation is one method of manufacture, for which excimer lasers have been used, but UV Nd:YAG (Neodymium-doped Yttrium Aluminium Garnet) lasers are an attractive alternative due to their widespread use within the PCB industry for drilling vias. In this paper, 355 nm, 60 ns pulse length UV Nd:YAG laser ablation of Truemode™ acrylate-based optical polymer was investigated. The UV Nd:YAG laser was found to be able to ablate the polymer efficiently and the effects of laser ablation power and pulse repetition frequency (PRF) on depth of ablation were studied and used to determine preferred settings. 45 μm × 45 μm multimode optical waveguides were fabricated to demonstrate the process and optical loss measurements were carried out. These measurements demonstrated that the structures were able to transmit light at the data communications wavelength of 850 nm (NIR), but further work is required to reduce the level of loss. The use of UV Nd:YAG as a possible alternative to excimer for laser micromachining would facilitate the rapid deployment of the optical technology within the PCB industry. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-Order Distortion in Directly Modulated Semiconductor Lasers in High-Loss Analog Optical Links With Large RF Dynamic Range

    Publication Year: 2011 , Page(s): 3577 - 3586
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1333 KB) |  | HTML iconHTML  

    A theoretical and experimental investigation of the effects of high-order nonlinear distortion products produced by directly modulated semiconductor lasers on the performance of high-loss analog optical communication links requiring large RF dynamic range is reported. In order to provide sufficient RF dynamic range to support radio services in links with high optical transmission loss, for example in radio over free-space optics (RoFSO), while keeping costs low, it is necessary to use directly modulated lasers. However, in these applications the lasers must be driven to high modulation depths to maximize dynamic range. Simulations show that under these unique conditions the first detectable nonlinear distortion is often the result of dynamic distortion due to the laser being driven near threshold. It is shown that this type of distortion is characterized by a sharp increase in the contribution of high-order (fourth order or greater) nonlinear terms resulting from the influence of laser relaxation oscillations. As a consequence, the third-order spurious-free dynamic range (SFDR) metric no longer accurately reflects the performance of such links as it assumes that third order effects are dominant. An alternative measure of dynamic range called dynamic-distortion-free dynamic range (DDFDR) is proposed. This differs in that the upper limit is defined as the modulating power at which the peak optical modulation index (OMI) reaches unity. At this point the error vector magnitude (EVM) measured for a range of different wireless services starts to increase rapidly due to high order distortion. This makes DDFDR a practical, service-independent metric of dynamic range. For two different wireless services it is observed experimentally that on average the DDFDR upper limit predicts the EVM knee point to within 1.1 dB, while the third-order SFDR predicts it to within 6.2 dB. The DDFDR is thus shown to be a more accurate indicator of real link performance when high-order distorti- - on is dominant. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 40 Gbps WDM Transmission Performance Comparison Between Legacy and Ultra Low Loss G.652 Fibers

    Publication Year: 2011 , Page(s): 3587 - 3598
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1958 KB) |  | HTML iconHTML  

    G.652 standard single-mode fiber (SSMF) is today considered as the most efficient solution to transport 40 Gbps and 100 Gbps data traffic over ultra long-haul distances on terrestrial transport networks. In the early 2000s, there was a trend to replace legacy G.652 fibers, which were strongly impaired by polarization mode dispersion (PMD), by G.655 fibers. For economic reasons, incumbent operators decided to keep their legacy G.652 fiber infrastructure, while replacing gradually the most impaired fibers by low PMD G.652 fibers over the links transporting the highest amount of traffic. In this context, we performed in 2009 an experimental evaluation of the performance of a new ultra low loss (ULL) and low PMD G.652 fiber to carry 40 Gbps WDM systems over ultra long-haul distances by using various modulation formats (NRZ-OOK and NRZ-DPSK) and amplification schemes (hybrid Raman-EDFA and EDFA only). We demonstrated record transmission distance of 4400 km at 40 Gbps line rate when NRZ-DPSK was combined with hybrid Raman-EDFA amplification. We complete here this previous study with new results, coming in particular from an extensive experimental and numerical comparison of the transmission performance of this new ULL G.652 fiber with the legacy G.652 fiber, used in the field for 20 years. We demonstrate in particular that this new SMF-28® ULL optical fiber increases the maximum transmission reach by ~30%, whatever the amplification scheme, when NRZ-DPSK is used. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Blank page

    Publication Year: 2011 , Page(s): 3599 - 3600
    Save to Project icon | Request Permissions | PDF file iconPDF (6 KB)  
    Freely Available from IEEE
  • IEEE EnergyTech 2012

    Publication Year: 2011 , Page(s): 3601
    Save to Project icon | Request Permissions | PDF file iconPDF (722 KB)  
    Freely Available from IEEE
  • 2012 IEEE International Reliability Physics Symposium (IRPS)

    Publication Year: 2011 , Page(s): 3602
    Save to Project icon | Request Permissions | PDF file iconPDF (809 KB)  
    Freely Available from IEEE
  • IEEE Foundation [advertisement]

    Publication Year: 2011 , Page(s): 3603
    Save to Project icon | Request Permissions | PDF file iconPDF (320 KB)  
    Freely Available from IEEE
  • Quality without compromise [advertisement]

    Publication Year: 2011 , Page(s): 3604
    Save to Project icon | Request Permissions | PDF file iconPDF (324 KB)  
    Freely Available from IEEE
  • Journal of Lightwave Technology information for authors

    Publication Year: 2011 , Page(s): C3
    Save to Project icon | Request Permissions | PDF file iconPDF (29 KB)  
    Freely Available from IEEE
  • Blank page [back cover]

    Publication Year: 2011 , Page(s): C4
    Save to Project icon | Request Permissions | PDF file iconPDF (5 KB)  
    Freely Available from IEEE

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