Signal beam

About: Signal beam is a research topic. Over the lifetime, 1881 publications have been published within this topic receiving 20717 citations.

Signal amplification based on the local nonlinear Mach–Zehnder interferometer

Abstract: Using the phase modulation of spatial solitons, a new scheme for all-optical signal amplification has been proposed in this paper The considered structure is composed of the nonlinear Mach–Zehnder interferometer (NMZI) with the straight control waveguide (CWG), the uniform nonlinear medium (NLM) and the linear output waveguide The local NMZI functions like a phase shifter The light-induced index changes in the local nonlinear MZI are responsible for the input beam routing in the uniform nonlinear medium The coupling of the input beam to the output waveguide depends on its propagation direction in the NLM It is shown that the signal launched at CWG can deflect the beam launched at the NMZI (input beam) and a modulated (amplified) output could be obtained at the output waveguide Further, signal pulse may be reshaped by appropriately increasing the NLM length In addition, amplification factor may be enhanced by increasing the NLM length and injecting an appropriate continuous wave beam along with the signal beam at CWG

Two-wavelength switching with 1.55 μm VCSOA

Abstract: Two-wavelength switching of a signal beam by a control signal at a different wavelength is demonstrated for the first time in a 1550 nm vertical cavity semiconductor optical amplifier (VCSOA). This result offers promise for the use of VCSOAs in all-optical switching/routing applications.

Compact broadband spectrometer based on upconversion and downconversion luminescence.

Abstract: In this Letter, a compact spectrometer based on upconversion and downconversion luminescence for operation in the infrared, visible, and ultraviolet bands is presented. The proposed spectrometer has three components that are used for dispersion, frequency conversion, and detection. The conversion component converts the incident signal beam into a spectral window appropriate for the detection component. The detection component images the speckle pattern generated by scattering or diffraction in the random structure of the dispersion component. With the two-dimensional intensity data captured from both the speckle pattern and a calibration measurement process, one can reconstruct the spectra of the signal beam by solving a matrix equation. A smoothing simulated annealing algorithm has been implemented to improve the accuracy of the spectral reconstruction. We have analyzed possible sources of error in the algorithm and the corresponding limits of operation. The reported broadband, compact, high-resolution, luminescence-based spectrometer is well suited for portable spectroscopy applications.

Holographic data recording apparatus and method

Abstract: A holographic data recording apparatus includes: a signal beam patterning unit (48) for irradiating a signal beam onto a holographic medium (50), the signal beam including a data pattern to be recorded; a cylindrical optical body (102) including a cylindrical reflective surface, by which a first and a second reference beams alternatively incident thereto at incident angles are reflected toward the holographic medium, alternatively; and an incident angle control unit for controlling the incident angles of the first and the second reference beams incident on the cylindrical optical body, wherein the data pattern is recorded on the holographic medium by interfering the signal beam with the first and the second reference beams on the holographic medium. The holographic data recording apparatus do not require the replacement of the conventional conical mirrors while recording a plurality of data on a holographic medium, thereby increasing the recording speed and reducing the manufacturing cost thereof.