Optical polarization

About: Optical polarization is a research topic. Over the lifetime, 13992 publications have been published within this topic receiving 244284 citations.

Optical Switches Based on Silicon Photonics for ROADM Application

Abstract: We demonstrate compact and low-loss $8 \times 8$ silicon photonic switch modules, which are applicable to transponder aggregators (TPAs) in colorless, directionless, and contentionless reconfigurable optical add-drop multiplexers. Newly designed silicon optical switch chips incorporating spot size converters with polarization insensitive and wavelength insensitive properties over C/L bands are packaged. The developed module shows about 6-dB average excess optical loss, including optical coupling loss, on all 64 optical paths with low-polarization-dependent loss and low crosstalk. Using these compact optical switch modules, we construct a TPA prototype featuring over 100-port optical switch subsystem densely mounted on one board and confirm its feasibility.

Observation of BER degradation due to fading in long-distance optical amplifier system

Abstract: 4500 km optical fibre transmission at 5 Gbit/s was successfully carried out using 138 erbium-doped fibre amplifiers. However, the long term performance measurement shows BER fluctuation. It is found that such BER fluctuation can be correlated to the fading of the optical signal-to-noise ratio presumably due to the polarisation effect.

Combined optical and microwave approach for performing quantum spin operations on the nitrogen-vacancy center in diamond

Abstract: Electron spin echoes were performed on nitrogen-vacancy $(\mathrm{N}\ensuremath{-}V)$ centers in diamond using optical polarization and detection and 35 GHz microwave control. The experiments demonstrate an approach to quantum information in the solid state. A phase memory time of $3.6 \ensuremath{\mu}\mathrm{s}$ was measured, and coupling of the electronic spin to the ${}^{14}\mathrm{N}$ nuclear spin was observed. Because of the favorable properties of the $\mathrm{N}\ensuremath{-}V$ center, interesting extensions of these single-qubit operations can be proposed.

Optical Injection-Induced Polarization Switching Dynamics in 1.5- $\mu$ m Wavelength Single-Mode Vertical-Cavity Surface-Emitting Lasers

Abstract: We report the first experimental invetigation of the polarization-mode switching dynamics and injection-wavelength-dependent polarization-mode bistability of a 1.5-m wavelength single-mode vertical-cavity surface-emitting lasers (VCSELs) under external laser beam injection. An injection beam with polarization orthogonal to that of the stand-alone VCSEL caused polarization-mode instability and switching of the VCSEL output. By varying the optical injection detuning for fixed injection power observation was made of a novel form of polarization bistability which will have applications in a new type of all-optical flip-flop and signal processing scheme.

Stabilized (3)He-(20)Ne transverse Zeeman laser.

Abstract: Tuning characteristics of power, intramode beat frequency, and polarization of 633-nm internal mirror lasers filled with natural Ne or 20Ne are studied. It is found that the tuning curve of a polarization signal is S-shaped for the natural Ne laser, whereas that of the intramode beat frequency is S-shaped for the 20Ne laser. The characteristic parameters of the tuning curve of the intramode beat frequency are determined. The axial modes of a 3He–20Ne laser are collapsed into one by a transverse magnetic field and frequency stabilized by cooling the laser tube with a fan to keep the intramode beat constant. Frequency fluctuation of 3 × 10−10 is obtained by the Allan variance analysis for the integration period range of 0.1–100 sec. Absolute accuracy and interinstrumental reproducibility of stabilized wavelengths can be expected for a 3He–20Ne transverse Zeeman laser stabilized at the central frequency of the intramode beat.