| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 359337400 | Complementary, adjusting stages | 7 |
| 20080225385 | MULTI-STAGE OPTICAL AMPLIFIER AND METHOD OF CONTROLLING THE SAME - The present invention provides a multi-stage optical amplifier including a high SN ratio and a method of controlling the same. A multi-stage optical amplifier is configured such that the gain of an amplifying unit in a first stage is greater than that of an amplifying unit in another stage. Therefore, it is possible to increase signal components that have been reduced due to spontaneously emitted light in the first stage, and thus relatively reduce noise. As a result, the obtained signals including a high SN ratio can be maintained in another stage, and it is possible to obtain a high SN ratio. | 09-18-2008 |
| 20090091820 | Real-time terahertz imaging system for the detection of concealed objects - A terahertz imaging system and method of use including a compact Yb-doped fiber laser-pumped ZGP crystal as a THz source and an uncooled microbolometer array as a detector. According to the present invention, semiconductor lasers are also drive current modulated to produce desired laser pulsewidth, repetition rate and wavelengths needed for DFG THz generation in various non-linear crystals. The fiber-coupled semiconductor lasers provide at least two wavelengths that will produce THz radiation by DFG in non-linear converter. These two wavelengths are combined and amplified in a single Yb fiber amplifier chain. Yb amplifier is staged in continually increasing core diameters to provide significant signal amplification while suppressing deleterious non-linear effects. | 04-09-2009 |
| 20100128344 | TECHNIQUE FOR COMPENSATING UNDESIRED EFFECTS IN OPTICAL LINKS OF AN OPTICAL COMMUNICATION NETWORK - A technique for compensating undesired effects in optical links of an optical communication network, using adjustment modules suitable for inserting into optical links, preferably into the links incoming network nodes. Each of the adjustment modules serves for compensating two or more different physical effects accumulated in the optical link when transmitting an optical signal there-along. The module comprises at least two controllable blocks respectively comprising a variable gain optical amplifier VGA for selectively compensating power loss and a tunable dispersion compensation module TDCM for selectively compensating chromatic dispersion. | 05-27-2010 |
| 20100315699 | Phase Control and Locking Method for Coherently Combining High-Gain Multi-Stage Fiber Amplifiers - Presented is a method and system for phase locking a multi-stage parallel fiber amplifier. The method comprises receiving a signal beam from a first stage, in one path of the multi-stage fiber amplifier, onto a fiber that is pumped to produce a saturated signal beam that is then output to a second stage that outputs an amplified beam. A characteristic of the of the saturated signal beam is that its phase and amplitude do not substantially change based on the amplitude of the signal beam input onto the fiber. The method further detects a portion of the amplified beam to produce a phase indication of the amplified beam relative to amplified beams of the other paths of the multi-stage fiber amplifier. The method modulates the pump level of the first stage to control the phase of amplified beam, and further controls the phases of the other amplified beams of the other paths to phase lock the multi-stage parallel amplifier. The saturated signal beam reduces phase changes in the second stage that would be opposite to, and therefore counteract, the phase changes intentionally modulated in the first stage. | 12-16-2010 |
| 20130016422 | Q-switching-induced Gain-switched Erbium Pulse Laser SystemAANM TSAI; Tzong-YowAACI Tainan CityAACO TWAAGP TSAI; Tzong-Yow Tainan City TW - The present invention relates to a Q-switching-induced gain-switched erbium pulse laser system, capable of generating erbium laser pulses within the 2.5 μm to 3.0 μm wavelength region, by means of Q-switching operation at 1.6 μm. At first, an Er | 01-17-2013 |
| 20150295379 | METHOD AND SYSTEM FOR PARITY-TIME SYMMETRIC OPTICS AND NONRECIPROCAL LIGHT TRANSMISSION - A method and system for optical systems based on parity-time symmetry and its breaking, and for nonreciprocal light transmission in a parity-time symmetric micro-resonator system are provided. The system includes an optical assembly that includes a first dissipative optical system and a second optical system coupled in energy transfer communication with the first optical system. The second optical system is configured to receive a continuous flow of energy from an external source and to transfer energy to the first optical system through the couple wherein the energy transferred to the first optical system from the second optical system is approximately equal to the energy dissipated in the first optical system, where the energy transferred to the first optical system from the second optical system is selectable using at least one of an amount of couple between the first optical system and the second optical system and a gain of the second optical system. | 10-15-2015 |
| 20160141828 | Method and Apparatus for Polarization Determination and/or Control in Optical Fiber Amplifying Systems - Methods and apparatuses for determining the polarization state and for providing polarization control in optical fiber lasers and amplifiers. One embodiment of the invention is an optical fiber amplifying system including a circulator ( | 05-19-2016 |
