# IEEE Photonics Technology Letters

## Filter Results

Displaying Results 1 - 25 of 30

Publication Year: 2007, Page(s):53 - 54
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• ### Monolithic Integrated Modulator on Silicon for Optical Interconnects

Publication Year: 2007, Page(s):55 - 57
Cited by:  Papers (2)
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A modulator structure based on the electrical field modified saturation absorption is proposed. Adequate modulation depth of 90% is expected from simulation results. Thirty-six percent modulation depth and 6-dB insertion loss are achieved in the prototype device. Higher modulation depth can be achieved via improved matching of the cavity mode with the laser wavelength. With its ability of forming ... View full abstract»

• ### Transition From Perturbed to Coupled-Cavity Behavior With Asymmetric Spectral Emission in Ridge Lasers Emitting at 1.55 $mu$m

Publication Year: 2007, Page(s):58 - 60
Cited by:  Papers (5)
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We have investigated a series of ridge waveguide lasers with deeply etched slots in the ridges. The slots do not penetrate the active region, but are deep enough to strongly perturb the longitudinal modes. By the addition of slots, a transition between perturbed-mode and coupled-cavity behavior is crossed. With a group of four or more slots, the below-threshold amplified spontaneous emission spect... View full abstract»

• ### Coupling of Organic Semiconductor Amplified Spontaneous Emission Into Polymeric Single-Mode Waveguides Patterned by Deep-UV Irradiation

Publication Year: 2007, Page(s):61 - 63
Cited by:  Papers (10)
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Single-mode waveguides were fabricated by deep ultraviolet radiation in poly(methyl methacrylate) (PMMA). Using a masking process, the radiation modifies the refractive index of the PMMA forming core and cladding regions for waveguiding. Following the fabrication of the waveguides, the small molecule material aluminum tris(8-hydroxyquinoline) doped with the laser dye DCM is deposited directly onto... View full abstract»

• ### Rayleigh Scattering Reduction by Means of Optical Frequency Dithering in Passive Optical Networks With Remotely Seeded ONUs

Publication Year: 2007, Page(s):64 - 66
Cited by:  Papers (15)
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With the purpose of reducing the crosstalk caused by Rayleigh scattering in bidirectional centralized light systems, we propose and experimentally demonstrate an optical frequency modulation to broaden the optical spectrum effectively. Analytic expressions for the Q-parameter of the signal affected by Rayleigh backscattering are also given and experimentally checked, both for optical frequency sta... View full abstract»

• ### An Improved Technique for Suppression of Intrachannel Four-Wave Mixing in 40-Gb/s Optical Transmission Systems

Publication Year: 2007, Page(s):67 - 69
Cited by:  Papers (9)  |  Patents (1)
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This letter presents an efficient method for testing the efficiency of modulation techniques for countering the effects of intrachannel four-wave mixing by calculating the sum of all the contributors at a given resonance position (the position affected by the surrounding pulses). In addition to this method, we are proposing a modulation technique that shows a significant Q-factor improvement of up... View full abstract»

• ### Tunable GHz Repetitive ps Pulse InGaN Laser

Publication Year: 2007, Page(s):70 - 72
Cited by:  Papers (10)
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Using sinusoidal waveform, an InGaN laser unit which incorporated a 50-Omega impedance-matching unit was used to generate <70-ps pulses with a repetition frequency ranging from 800MHz to 3.0 GHz. At 1.0 GHz, the pulses with a pulsewidth of 31ps and a peak power of >450 mW were obtained using +27dBm of RF power. Tuning characteristics of this gain-switching laser were studied View full abstract»

• ### Joint Maximum Likelihood Sequence Estimation for Chromatic-Dispersion Compensation in ASK-DPSK Modulation Format

Publication Year: 2007, Page(s):73 - 75
Cited by:  Papers (2)
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We determine the fundamental impairment mechanism in the chromatic-dispersion (CD)-limited hybrid amplitude shift keying (ASK)-differential phase-shift keying (DPSK) modulation format and propose the employment of joint maximum likelihood sequence estimation (J-MLSE) for CD compensation to extend the transmission reach of such format. We find that it is not the intrasubchannel interference of the ... View full abstract»

• ### Message Encryption by Phase Modulation of a Chaotic Optical Carrier

Publication Year: 2007, Page(s):76 - 78
Cited by:  Papers (21)  |  Patents (2)
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We present a numerical and experimental evaluation of message encryption by phase modulation, using a chaotic optical carrier generated by a laser subject to delayed optical feedback. This method offers better security than the conventional amplitude masking, where the signal is simply added to the chaotic waveform View full abstract»

• ### Impact of Pump Phase-Modulation on the Bit-Error Rate in Fiber-Optical Parametric-Amplifier-Based Systems

Publication Year: 2007, Page(s):79 - 81
Cited by:  Papers (8)  |  Patents (2)
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Pump phase-modulation is often needed to suppress stimulated Brillouin scattering in fiber-optical parametric amplifiers. We show that while this causes a gain variation with a corresponding Q-value penalty, the actual bit-error-rate degradation is not always significant. The findings are supported by experimental studies View full abstract»

• ### Simulations and Experiments on the Effective Optical Gain of FEC in a GPON Uplink

Publication Year: 2007, Page(s):82 - 84
Cited by:  Papers (6)
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This letter studies the effective optical gain of Reed-Solomon (RS) forward-error correction (FEC) in a burst-mode gigabit passive optical network (GPON) uplink. Numerical simulations are made of the performance of an RS (255, 239) FEC code. For the first time, FEC performance is measured in a 1.25-Gb/s burst-mode GPON uplink in the presence of mode partition noise (MPN). Measurements show that th... View full abstract»

• ### Study of Multichannel Parallel Anti-Symmetric Waveguide Bragg Gratings for Telecom Applications

Publication Year: 2007, Page(s):85 - 87
Cited by:  Papers (4)
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We theoretically demonstrate the viability of parallel anti-symmetric waveguide Bragg gratings within a two-mode waveguide. These gratings produce reflections with mode conversions. This is the functional equivalent of superimposed Bragg gratings in silica-on-silicon without requiring multilevel etches. Also, due to their weaker coupling constant, these gratings allow for devices with narrow spect... View full abstract»

• ### Noise in Orthogonally Pumped Fiber-Optical Parametric Amplifiers

Publication Year: 2007, Page(s):88 - 90
Cited by:  Papers (2)  |  Patents (3)
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The noise figure (NF) of a fiber-optical parametric amplifier, driven by pumps with orthogonal polarizations, is quantified experimentally. It is shown that this amplifier has a signal-polarization-dependent gain, with a corresponding polarization-dependent NF. The polarization dependence of the NF is particularly large when higher input-signal powers are amplified, in which case pump-induced nois... View full abstract»

• ### Surface Plasmon Bragg Gratings Formed in Metal-Insulator-Metal Waveguides

Publication Year: 2007, Page(s):91 - 93
Cited by:  Papers (216)  |  Patents (1)
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We propose and numerically analyze surface plasmon Bragg gratings formed by a periodic variation of the width of the insulator in a metal-insulator-metal waveguide. The results indicate that very good filtering characteristics can be achieved in these plasmonic Bragg gratings. To suppress the sidelobes in the transmission spectrum, we further propose S-shaped Bragg cells and find better performanc... View full abstract»

• ### Ultrashort Pulses From a Mode-Locked Diode-Oscillator Yb-Fiber-Amplifier System

Publication Year: 2007, Page(s):94 - 96
Cited by:  Papers (3)
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Ultrashort optical pulses are generated using a hybrid master oscillator power amplifier source. Pulses 2.2 ps in duration generated by a two-contact, bent-waveguide passively mode-locked semiconductor laser are amplified in a ytterbium-doped fiber amplifier to an average power of 0.8 W. External pulse compression yields durations as low as 765 fs with peak powers as high as 0.9kW. Amplification o... View full abstract»

• ### Gain-Stabilized Erbium-Doped Waveguide Amplifier for Burst Transmission

Publication Year: 2007, Page(s):97 - 99
Cited by:  Papers (6)
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We demonstrate an optical gain-clamped waveguide amplifier robust against wavelength-division-multiplexing (WDM) burst transmission transients even with synchronous arrival of all packets. A maximum power excursion of about 0.3 dB is reported for the worst case under repeated burst arrivals. We show that a very small difference in burst periodicity generates completely different transient dynamics... View full abstract»

• ### Self-Locked Excitation Scheme for Microsphere Resonators

Publication Year: 2007, Page(s):100 - 102
Cited by:  Papers (5)
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We propose a new scheme for exciting a resonant mode of a glass microsphere resonator. The concept is based on unique properties of coupled resonators. In the proposed setup, the microsphere plays the role of a feedback mirror in an erbium-doped fiber laser, where the lasing wavelength is automatically locked to a resonant mode of the microsphere. As a result, the laser radiation builds up to very... View full abstract»

• ### Receiver Optimization in Turbulent Free-Space Optical MIMO Channels With APDs and $Q$-ary PPM

Publication Year: 2007, Page(s):103 - 105
Cited by:  Papers (28)
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We propose an accurate, robust avalanche photodiode (APD) receiver optimization scheme for multiple-input/multiple-output (MIMO) free-space optical links with Q-ary pulse position modulation in the presence of atmospheric turbulence. Through extensive error probability (Pe ) analysis, we show that selecting the APD gain such that the nonfading receiver-array signal-to-noise ratio is max... View full abstract»

• ### Intrinsic Dynamic Properties of High-Characteristic Temperature GaInNAs Laser Diodes Operating at 1.3 $mu$m

Publication Year: 2007, Page(s):106 - 108
Cited by:  Papers (5)
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The properties of a high-characteristic temperature (T0=155K) 1.3-mum GaInNAs-GaAs laser are presented with an emphasis on laser dynamic characteristics evaluated by linewidth enhancement factor and relative intensity noise. It is found that the relatively high differential gain of GaInNAs-GaAs quantum wells leads to a small linewidth enhancement factor of 2.8, indicating a small magnit... View full abstract»

• ### High-Power 1.3-$mu$m Quantum-Dot Superluminescent Light-Emitting Diode Grown by Molecular Beam Epitaxy

Publication Year: 2007, Page(s):109 - 111
Cited by:  Papers (8)
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In this letter, we demonstrate the improved performance of 1.3-mum seven-layered InAs-GaAs quantum-dot superluminescent light-emitting diodes by the engineering of the epitaxial growth conditions alone, namely the thickness of the low-temperature GaAs spacer layer between quantum-dot layers. For laser devices, a significant reduction in threshold current density and increase in external efficiency... View full abstract»

• ### Real-Time Photobleaching and Stable Operation at 204 mW of a Tm : ZBLAN Blue Fiber Laser

Publication Year: 2007, Page(s):112 - 114
Cited by:  Papers (6)
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We report the observation of a stable output power of 204 mW in a Tm3+ : ZBLAN upconversion blue fiber laser, which we believe to be the highest reported to date as being stable in the long term. For the first time, we also present results of the dynamics of a real-time photobleaching of the color centers by an external laser source during laser oscillation. The dependence of the photoi... View full abstract»

• ### In-Band OSNR Monitoring Using Spectral Analysis After Frequency Down-Conversion

Publication Year: 2007, Page(s):115 - 117
Cited by:  Papers (3)  |  Patents (3)
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A novel method for simultaneous optical signal-to-noise ratio and chromatic dispersion monitoring in wavelength-division multiplexed 40-Gb/s systems is proposed and demonstrated. This technique has a fast response time of <10 ms, applicable to dynamically reconfigurable networks, and is able to simultaneously monitor multiple impairments across multiple channels View full abstract»

• ### 650-nm InGaP Broad Area Lasers With 5000-h Reliable Operation at 600 mW

Publication Year: 2007, Page(s):118 - 120
Cited by:  Papers (6)
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Reliable operation of 650-nm broad area laser diodes with InGaP quantum-wells embedded in AlGaInP waveguide layers and n-AlInP and p-AlGaAs cladding layers is reported. Mounted on chemical vapor deposition (CVD)-diamond heat spreader and standard C-mounts, the 100-mum stripe width lasers showed reliable operation over 5000 h at 15 degC and 600 mW View full abstract»

• ### Cavity Mode—Gain Peak Tradeoff for 1320-nm Wafer-Fused VCSELs With 3-mW Single-Mode Emission Power and 10-Gb/s Modulation Speed Up to 70 $^{circ}$C

Publication Year: 2007, Page(s):121 - 123
Cited by:  Papers (34)  |  Patents (1)
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Room-temperature cavity mode red-shift of about 45nm from the photoluminescence peak is found to be optimal for tradeoff between high modulation bandwidth and good high-temperature performance for InAlGaAs(InP)-AlGaAs fused vertical-cavity surface-emitting lasers (VCSELs) employing tunnel junction carrier injection. Single-mode output power up to 5.4 and 3.1 mW, at 25 degC and 75 degC, respectivel... View full abstract»

• ### Higher Order Polarization-Mode Dispersion in the Presence of Polarization-Dependent Loss in Optical Fiber Systems

Publication Year: 2007, Page(s):124 - 126
Cited by:  Papers (4)
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The statistics of first- and second-order polarization-mode dispersion and statistical dependencies between corresponding quantities are investigated with regard to fiber-optic links with polarization-dependent loss (PDL). We show the occurrence of an infinite depolarization rate of the principal states of polarization (PSPs) caused by an abrupt interchange of the two PSPs with a probability that ... View full abstract»

## Aims & Scope

IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Prof. Jianping Yao
University of Ottawa