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# IEEE Photonics Technology Letters

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Displaying Results 1 - 25 of 36
• ### Front Cover

Publication Year: 2012, Page(s): C1
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• ### IEEE Photonics Technology Letters publication information

Publication Year: 2012, Page(s): C2
| PDF (128 KB)

Publication Year: 2012, Page(s):1787 - 1788
| PDF (113 KB)
• ### All-Optical Generation of Optical BPSK/QPSK Signals Interleaved With Reference Light

Publication Year: 2012, Page(s):1789 - 1791
Cited by:  Papers (2)
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In this letter, all-optical generation of multilevel modulated signals interleaved with reference light is proposed and experimentally demonstrated. Four Gbaud BPSK and QPSK signals interleaved with reference light are generated using a based 22 optical switch, and the generated signals are demodulated by self-homodyne detection using an optical delay interferometer and a single photodetector. Mor... View full abstract»

• ### Mechanically Exfoliated Graphene for Four-Wave-Mixing-Based Wavelength Conversion

Publication Year: 2012, Page(s):1792 - 1794
Cited by:  Papers (26)
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In this letter, we present an experimental observation of four-wave-mixing (FWM)-based wavelength conversion in an all-fiber configuration by a thin film of mechanically exfoliated graphene. In addition, using the optical deposition method, we fabricate carbon nanotube and graphene thin film and compare the third-order nonlinearity of three types of nanomaterials-based nonlinear devices by FWM. View full abstract»

• ### 100-Hz Linewidth Diode Laser With External Optical Feedback

Publication Year: 2012, Page(s):1795 - 1798
Cited by:  Papers (9)
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We present a narrow-linewidth diode laser with optical feedback from a high-finesse two-mirror nonconfocal cavity. The laser's full-width-at-half-maximum linewidth is reduced to 100 Hz, and its instantaneous linewidth to 30 Hz in the Lorentzian fitting. To the best of our knowledge, it is the narrowest linewidth ever achieved with the optical feedback method. The laser phase noise has been signifi... View full abstract»

• ### Prediction of Dispersion Relation and PBGs in 2-D PCs by Using Artificial Neural Networks

Publication Year: 2012, Page(s):1799 - 1801
Cited by:  Papers (1)
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The prediction of dispersion relation and photonic band gaps in 2-D photonic crystals using artificial neural networks is demonstrated in this letter. Two case studies are carried out in order to evaluate the advantages of using this approach in conjunction with numerical methods. The results obtained present values that are very close to those obtained by a numerical solver and with short time-pr... View full abstract»

• ### Adaptive Speckle Reduction in OCT Volume Data Based on Block-Matching and 3-D Filtering

Publication Year: 2012, Page(s):1802 - 1804
Cited by:  Papers (1)
| | PDF (533 KB) | HTML

An adaptive speckle denoising method called Volume-BM3D is developed for optical coherence tomography (OCT) volume data processing, including an adaptive noise level estimation algorithm and a denoising strategy based on block-matching and filtering in a highly sparse local 3-D transform domain. Noise level estimation, an important step for denoising, is obtained from estimating signal fluctuation... View full abstract»

• ### Tunable Microwave Photonic Notch Filter and Bandpass Filter Based on High-Birefringence Fiber-Bragg-Grating-Based Fabry–Pérot Cavity

Publication Year: 2012, Page(s):1805 - 1808
Cited by:  Papers (6)
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We propose and successfully demonstrate a microwave photonic filter based on phase modulation (PM) and a fiber-Bragg-grating-based Fabry-Pérot (FBG-FP) cavity etched in a high-birefringence fiber. It can switch between continuously tunable single notch filter and bandpass filter operation. The principle of the tunable notch filter is based on the reflection response of the FBG-FP to break ... View full abstract»

• ### GaN-Based LEDs With Double Strain Releasing MQWs and Si Delta-Doping Layers

Publication Year: 2012, Page(s):1809 - 1811
Cited by:  Papers (6)
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In this letter, we report the fabrication of GaN-based light-emitting diodes (LEDs) with double strain releasing multiquantum wells and Si delta-doping (Si-DD) layers. We find that Si-DD can enhance current spreading in the in-plane direction and also suppress dislocation in the epitaxial layers. By inserting the Si-DD layers, we find that we can achieve a smaller forward voltage. We also find tha... View full abstract»

• ### Near-Common-Path Self-Reference Quantitative Phase Microscopy

Publication Year: 2012, Page(s):1812 - 1814
Cited by:  Papers (2)
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We report a near-common-path self-reference quantitative phase microscope, wherein a quantitative phase image is formed through the off-axis interference of the sample wave with a 180-degree rotated version of itself. A pair of dove prisms, oriented in different directions, is used to effect the relative transformation between the beams. Our technique features a simple optical design that requires... View full abstract»

• ### Polarization-Time Code and 4$\,\times\,$ 4 Equalizer-Decoder for Coherent Optical Transmission

Publication Year: 2012, Page(s):1815 - 1818
Cited by:  Papers (2)
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A linear polarization-time code in conjunction with an adaptive multi-tap 4 4 joint equalizer-decoder is proposed to average the effects of polarization-dependent impairments on two polarizations. For the first time in the context of polarization-time coding, there is no assumption of polarization-dependent loss (PDL) of knowledge at the receiver. This method compensates the performance loss penal... View full abstract»

• ### Demonstration of a Plasmonic MMI Switch in 10-Gb/s True Data Traffic Conditions

Publication Year: 2012, Page(s):1819 - 1822
Cited by:  Papers (5)
| | PDF (556 KB) | HTML

We report the first experimental performance evaluation of a 75-μm-long plasmonic multimode interference switch that is hetero-integrated on a silicon-on-insulator platform, operating with 10-Gb/s data signals. The switch exhibits a 2.9-μs response time and 44.5% modulation depth, while the extinction ratio between the ports alters from 5.4 to -1.5 dB for 35-mW electrical (switching)... View full abstract»

• ### Simplex-Coded BOTDA Sensor Over 120-km SMF With 1-m Spatial Resolution Assisted by Optimized Bidirectional Raman Amplification

Publication Year: 2012, Page(s):1823 - 1826
Cited by:  Papers (23)
| | PDF (479 KB) | HTML

Bidirectional low-noise Raman amplification and simplex coding based on the return-to-zero modulation format are optimized through numerical simulations for long-range Brillouin optical time-domain analysis sensing. Experimental results are reported on sensing capabilities along 120-km distance with 1-m spatial resolution, and worst-case temperature and strain resolution values of 1.3 and 26 , res... View full abstract»

• ### Simple Algorithm for Calculation of Trapezoidal Recursive Convolution-Locally 1-D Finite-Difference Time-Domain Equations at Metal-Dielectric Interface

Publication Year: 2012, Page(s):1827 - 1829
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In this letter, to model surface plasmon polaritons, trapezoidal recursive convolution-locally 1-D finite-difference time-domain (TRC-LOD-FDTD) equations at metal-dielectric interface are derived using the Drude model. The integral form of Maxwell's curl equation for magnetic field is applied on Yee's lattice to establish boundary conditions. Then, the TRC technique is used for the analysis of the... View full abstract»

• ### Programming and Projection of Near IR Images Using ${rm VO}_{2}$ Films

Publication Year: 2012, Page(s):1830 - 1833
Cited by:  Papers (6)
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This letter reports the use of programmed optical states in a vanadium dioxide (VO2) thin film for the projection of near infrared (NIR) images. The optical states are programmed by photothermal actuation from scanning a focused red laser on localized regions of the VO2 thin film. The abrupt change in transmissivity of NIR wavelengths across VO2's solid-to-solid ph... View full abstract»

• ### Planar Waveguide Polarization Beam Splitter Based on Form Birefringence

Publication Year: 2012, Page(s):1834 - 1837
| | PDF (430 KB) | HTML

A novel polarization beam splitter is designed on a slab waveguide platform where light is vertically confined. Planar lenses are formed to collimate and refocus a light beam by converting the phase front of the beam. A planar subwavelength grating of a wedge shape induces the form birefringence, where the transverse electric and transverse magnetic waves have different effective refractive indice... View full abstract»

• ### Infrared Inhibition of Flashover in Photoconductive Semiconductor Switch in High Electric Field

Publication Year: 2012, Page(s):1838 - 1840
| | PDF (616 KB) | HTML

Semi-insulating GaAs photoconductive switches hold great potential for use in high-voltage switching applications. However, the utility is restricted by surface flashover, which resulted in breakdown in previous experiments. In this letter, we designed a configuration based on infrared inhibition to suppress the surface flashover in high-voltage operation. Bias voltage can be up to 32 kV with a 0.... View full abstract»

• ### Tunable Master-Oscillator Power-Amplifier Based on Chirped Quantum-Dot Structures

Publication Year: 2012, Page(s):1841 - 1844
Cited by:  Papers (6)
| | PDF (1110 KB) | HTML

A broadly tunable master-oscillator power-amplifier (MOPA) picosecond optical pulse source is demonstrated, consisting of an external cavity passively mode-locked laser diode with a tapered semiconductor amplifier. By employing chirped quantum-dot structures on both the oscillator's gain chip and amplifier, a wide tunability range between 1187 and 1283 nm is achieved. Under mode-locked operation, ... View full abstract»

• ### Edge-Triggered Ultra-Wideband Pulse Shaper Using Polarization-to-Intensity Conversion

Publication Year: 2012, Page(s):1845 - 1848
Cited by:  Papers (1)
| | PDF (934 KB) | HTML

A simple edge-triggered and chirp-free ultra-wideband (UWB) monocycle pulse shaper was proposed and demonstrated utilizing a nonlinearly operated polarization-to-intensity converter, which mainly consists of a polarization modulator (PolM), two polarization controllers (PCs), and a time-delay device. As static phase shift of the incident light φ0=π, a 500-MHz monocycle pul... View full abstract»

• ### Integration of Edge-Emitting Laser Diodes With Dielectric Waveguides on Silicon

Publication Year: 2012, Page(s):1849 - 1851
Cited by:  Papers (3)
| | PDF (913 KB) | HTML

Edge-emitting 1.55- platelet InGaAs/InP laser diodes are bonded in 6.5--deep recesses etched into a thick layer on an Si substrate so that they are aligned and coaxially coupled to SiON dielectric waveguides fabricated within the layer. The integrated lasers show room temperature pulsed and continuous wave (CW) lasing at threshold currents of 17 and 19 mA, respectively. The CW output power measure... View full abstract»

• ### High-Speed Photon-Number Resolving With Sinusoidally Gated Multipixel Photon Counters

Publication Year: 2012, Page(s):1852 - 1855
Cited by:  Papers (5)
| | PDF (685 KB) | HTML

We demonstrate a high-speed photon-number-resolving detector based on a sinusoidally gated multipixel photon counter (MPPC) at a repetition rate of 200 MHz. Two steps of low-pass filters are used to minimize the MPPC's capacitive response noise in sinusoidally gated Geiger mode, resulting in the efficient detection of weak photon-induced avalanche currents. Compared with passive quenching schemes,... View full abstract»

• ### Reconfigurable Linear Optical FM Discriminator

Publication Year: 2012, Page(s):1856 - 1859
Cited by:  Papers (9)
| | PDF (541 KB) | HTML

We present a reconfigurable optical discriminator filter for frequency modulated microwave-photonics link applications. The filter is based on a simplified ring-assisted Mach-Zehnder interferometer configuration. It enables conversion of a highly linear frequency to amplitude modulation. Operations in a fixed bandwidth (BW) of 30 GHz and a tunable bandwidth from 10 to 30 GHz are achieved using thi... View full abstract»

• ### Multilevel Modulations for Gigabit Access in a Simple Millimeter-Wave Radio-Over-Fiber Link

Publication Year: 2012, Page(s):1860 - 1863
Cited by:  Papers (4)
| | PDF (451 KB) | HTML

A spectrally efficient and simplified full-duplex millimeter-wave (mm-wave) radio-over-fiber (RoF) link is proposed and experimentally demonstrated. For downlink, a multilevel amplitude-shift-keying (M-ASK) modulation, such as 4-ASK, for a total data rate of 5 Gb/s, is applied on two uncorrelated optical carriers at the central station (CS) for remote heterodyning at the photodetector. The mm-wave... View full abstract»

• ### All-Fiber Counter-Propagation Pumped Single Frequency Amplifier Stage With 300-W Output Power

Publication Year: 2012, Page(s):1864 - 1867
Cited by:  Papers (25)
| | PDF (676 KB) | HTML

We present a single frequency ytterbium-doped fiber amplifier, counter-propagation pumped with an all-fiber pump and signal combiner. The fiber combiner is capable of handling 440 W of pump power as well as the maximum achieved output power of 301 W. The threshold of stimulated Brillouin scattering of the high-power fiber amplifier was shifted from 175 to 280 W by external thermal management in co... View full abstract»

## Aims & Scope

This letters journal 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
Dr. Seb J. Savory
University of Cambridge