Patent application number | Description | Published |
20090135408 | Method for reducing the uncertainty of the measured average PMD of a long fiber - A methodology, device and memory medium for measuring the polarization mode dispersion (PMD) of an optical fiber is disclosed. The root mean square (rms) differential group delay (DGD) of fiber sections is estimated, the multisection DGD value τ | 05-28-2009 |
20090147244 | Method and apparatus for measuring the birefringence autocorrelation length in optical fibers - Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle. | 06-11-2009 |
20090180776 | Architecture for reconfigurable quantum key distribution networks based on entangled photons by wavelength division multiplexing - A system and method for securing communications over a wave division multiplexing optical network between a plurality of users connected to the network. The system utilizes a primary optical source generator that is either tunable, or capable of generating a plurality of wavebands of different frequencies equal to the sum of wavebands serving individual users of the network to facilitate a key exchange between the individual users of the network using summed wavebands, each of which serving an individual user. | 07-16-2009 |
20100067903 | Interferometric optical signal-to-noise ratio measurement using a calibration factor - Systems and methods are described that measure the OSNR of an optical channel. Embodiments provide OSNR measurement methods that distinguish the intensities of the coherent modulated signal from the incoherent noise intensity occupying the same optical band using a calibration factor ζ. | 03-18-2010 |
20100067904 | Calibration factor for interferometric optical signal-to-noise ratio measurement - Systems and methods are described that measure the OSNR of an optical channel. Embodiments provide OSNR measurement methods that distinguish the intensities of the coherent modulated signal from the incoherent noise intensity occupying the same optical band using a calibration factor ζ. | 03-18-2010 |
20100123896 | Method and Apparatus for Measuring the Birefringence Autocorrelation Length in Optical Fibers - Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.) | 05-20-2010 |
20100239244 | System and method for measuring the extinction ratio of an optical transmitter using an interferogram wing-to-peak ratio - Systems and methods are described that derive a relationship between an optical transmitter's extinction ratio (E | 09-23-2010 |
20110110657 | Method for Measuring Signal Quality in WDM Optical Networks - A method and memory medium in a wavelength division multiplexing (WDM) network that communicates multiplexed signals representing a plurality of communication channels to determine received signal quality are disclosed. Generally, the signals format the plurality of communication channels to impart a distinctive noise profile in time or frequency for each channel; and collectively process the channels at a digital signal processing device to measure the signal-to-noise ratio. | 05-12-2011 |
20110129215 | Method and Apparatus for Broadband Mitigation of Polarization Mode Dispersion - Described is a method and system for reducing system penalty from polarization mode dispersion. The method includes receiving a plurality of signals at a receiving end of a transmission line, each signal being received on one of a plurality of channels of the transmission line and measuring a signal degradation of at least one of the channels of the transmission line. An amount of adjustment of a polarization controller is determined based on the signal degradation, the amount of adjustment being selected to reduce the polarization mode dispersion. The amount of adjustment is then transmitted to the polarization controller. | 06-02-2011 |