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| Number | Title | Issue Date |
| 8184972 | Method and apparatus relating to secure communication Data is encrypted onto an electromagnetic beam by providing an electromagnetic beam having a signal component having a modal state, wherein the signal component is susceptible to accumulation of a geometric phase, and a reference component, transmitted along a path ... | 05/22/2012 |
| 8180218 | PON system and terminal operation registering method In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an u... | 05/15/2012 |
| 8126327 | System for intercepting signals to be transmitted over a fiber optic network and associated method A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as... | 02/28/2012 |
| 8000601 | Method and apparatus for securing fiber in an optical network A method and apparatus for securing an optical communication link includes the step of identifying a profile of the link by measuring, at the transmitter, optical back-reflections from optical pulses forwarded to a receiver. The profile is stored at the transmitter.... | 08/16/2011 |
| 7949254 | Security message filtering using OCDMA encoding To achieve secure optical communications, a messaging encoding scheme is utilized in which optical communication signals are encoded based upon a known unique code. This encoding methodology allows for the broad transmission across an optical network which will incl... | 05/24/2011 |
| 7899325 | Protecting secret data entry from infrared and audio eavesdropping A method for protecting a data entry device from eavesdropping includes masking a signature of entry resulting from entry of data by a user of the data entry device so as to reduce the detectability of the signature by eavesdropping. The signature may include a temp... | 03/01/2011 |
| 7835644 | System for intercepting signals to be transmitted over a fiber optic network and associated method A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as... | 11/16/2010 |
| 7822342 | Secure quantum optical communications system and method An optical communication system is provided. In one embodiment, a source creates a multiplicity of photon pairs, with each photon pair comprising a first photon and a second photon. The first photon is sent to a transmitter, and either remains in the transmitter or ... | 10/26/2010 |
| 7684701 | Photonic quantum information system using unpolarised light A photon emitter including a photon generator configured to generate photons having a first polarization state or a second polarization state, the first polarization state being orthogonal to the second polarization state; and a time delay device which delays photon... | 03/23/2010 |
| 7680413 | Optical network monitoring system and method An optical network monitoring system and method provide for optical network diverting or further legal intercept, operational and/or other monitoring of general or specific transmission information that may be transmitted via a network optical branch. In one embodim... | 03/16/2010 |
| 7493040 | Method and apparatus for securing fiber in an optical network A method and apparatus for securing an optical communication link includes the step of identifying a profile of the link by measuring, at the transmitter, optical back-reflections from optical pulses forwarded to a receiver. The profile is stored at the transmitter.... | 02/17/2009 |
| 7362973 | Protecting secret data entry from infrared and audio eavesdropping A method for protecting a data entry device from eavesdropping includes masking a signature of entry resulting from entry of data by a user of the data entry device so as to reduce the detectability of the signature by eavesdropping. The signature may include a temp... | 04/22/2008 |
| 7330653 | Quantum dense coding system A Quantum Dense Coding System. The system includes a source, a transmitter and a receiver. The source is capable of down-converting a pump photon into a signal photon and an idler photon and outputting probability amplitudes, the signal photon and the idler photon, ... | 02/12/2008 |
| 7317574 | Long-distance quantum communication Apparatus and methods for high fidelity quantum communication over long communication channels even in the presence of significant loss in the channels are disclosed. The invention employs laser manipulation of quantum correlated atomic ensembles using linear optic ... | 01/08/2008 |
| 7302352 | Method and system for providing dying gasp support for a network component A method for providing dying gasp support for a network component is disclosed. The method includes detecting an imminent loss of power to the network component and disabling all sub-systems of the network component except a designated sub-system of the network comp... | 11/27/2007 |
| 7302187 | Minimum transmitted photon quantum optical communications system A system parametrically down-converts a photon into a pair of first and second quantum-entangled photons. A transmitter is coupled to receive the first photon and includes an irreversible collapse event device for collapsing the quantum-entangled state of each photo... | 11/27/2007 |
| 7283743 | Systems and methods for active monitoring and management of fiber links Systems and methods for actively monitoring and managing the integrity of an optical fiber communications link. The optical fiber link integrity is monitored to guard against intrusions and other security breaches. In one embodiment, a local and a remote active moni... | 10/16/2007 |
| 7266304 | System for secure optical transmission of binary code An optical binary code transmission system comprising a sender comprising: means for generating a light beam; phase-shifter means; attenuator means whereby the intensity of the lateral modes is sufficiently low for there to exist at the most only one photon in the l... | 09/04/2007 |
| 7248802 | Distribution of a synchronization signal in an optical communication system The invention relates to the distribution of a synchronization signal in an optical communication system which is inherently asynchronous. In order to accomplish a cost-efficient mechanism for transmitting a synchronization signal in such a system, the amplitude of ... | 07/24/2007 |
| 7231145 | Processing of optical performance data in an optical wavelength division multiplexed communication system Optical performance measurements are taken in an optical network and displayed in a form that allows an operator to enter fault information related to the measurements, or to automatically generate fault alarms to the operator, based on processing of the measurement... | 06/12/2007 |
| 7220954 | Quantum state transfer between matter and light Disclosed are apparatus and methods that provide for a coherent quantum state transfer of information from a two-level atomic system (matter) to a single photon (light). Entanglement between a single photon (signal) and a two-component atomic ensemble of cold Rubidi... | 05/22/2007 |
| 7146098 | Optical protection scheme A method for triggering an optical protection event in an optical layer of a network comprising the following steps: i) monitoring the optical performance of an optical signal transmitted within the optical layer of the network; ii) provisioning optical protection i... | 12/05/2006 |
| 7095960 | Spurious free dynamic range in optical communications systems The present invention is directed towards an optical transmitter including a noise generator. The noise generator provides noise signals that are filtered to below a frequency spectrum. The filtered noise signals are combined with RF signals to provide continuous mo... | 08/22/2006 |
| 7049961 | Key control system using separated ID and location detection mechanisms An object control and tracking system and related methods using separate object identification and location detection mechanisms for objects, such as keys, that are maintained in a secure enclosure, such as a key drawer. A plurality of object slots are located on th... | 05/23/2006 |
| 7046888 | Enhancing fiber-optic sensing technique using a dual-core fiber An optical fiber for use in fiber optic sensing of a test sample includes a first core and a second core. The second core is generally coaxially disposed within the first core and is sized smaller than the first core. The second core is capable of delivering pulsed ... | 05/16/2006 |
| 6978093 | Free space optical communication network The present invention provides a method and network for communicating over free space links. The network includes a plurality of buildings, each housing at least one of a residence and a business. Pluralities of free-space optical links are established, where each o... | 12/20/2005 |
| 6971805 | Techniques for providing multiple communications pathways A communications assembly includes a transmitter configured to receive a first electrical input signal and a second electrical input signal, and to provide a light signal having (i) light modulation based on the first electrical input signal and (ii) average power o... | 12/06/2005 |
| 6801700 | Optical fiber design for secure tap proof transmission The specification describes optical fibers that are constructed to prevent theft of optical signals. One construction is designed to block access of the core of the fiber to the “writing” radiation necessary to form a grating tap. In this embodiment the optical ... | 10/05/2004 |
| 6727490 | Method and apparatus for detecting malfunctions in communication systems Apparatus and techniques for detecting malfunctions, anomalies and attacks upon optical devices of a transparent all-optical network, including amplified links and optical nodes, of the network. A portion of an input signal of the optical device and a portion of an ... | 04/27/2004 |
| 6404523 | Wavelength division multiplexing system and its termination A computer for controlling a pre-emphasis process is provided at end terminal stations which are the terminal stations of a trunk. When a pre-emphasis process is performed to an optical signal directing from a terminal station to another terminal station,... | 06/11/2002 |
| 6289104 | Free-space quantum cryptography system A system and method for quantum key delivery in a single-photon, free-space cryptography scheme including a transmitter and a receiver. The transmitter includes two pairs of photon sources, each of which represents a specific photon polarization direction... | 09/11/2001 |
| 6104517 | Secure communications system A secure communications system which comprises a laser-sending system and a light receiver. The laser light is divided into two beams, one beam is modulated to add the signal thereto, then the beams are recombined and directed to the receiver. The receive... | 08/15/2000 |
| 6018582 | Optical transmission system implementing encrypting by deterministic chaos The invention relates to an optical transmission system that implements encrypting of an information carrying signal by deterministic chaos. The system includes a transmitter (1), a receiver (4), and one transmission channel coupled between the transmitte... | 01/25/2000 |
| 5966224 | Secure communications with low-orbit spacecraft using quantum cryptography Apparatus and method for secure communication between an earth station and spacecraft. A laser outputs single pulses that are split into preceding bright pulses and delayed attenuated pulses, and polarized. A Pockels cell changes the polarization of the p... | 10/12/1999 |
| 5953421 | Quantum cryptography In a method of communication using quantum cryptography, single-photon signals from a highly attenuated source are modulated and subsequently detected. In the step of detecting the modulated signal, the signal is split between two branches according to it... | 09/14/1999 |
| 5850441 | System and method for key distribution using quantum cryptography A method of communication based on quantum cryptography is modified to include an initial step of outputting from, e.g., a transmitter, a single-photon signal, which may be unmodulated. A receiver then randomly selects one of a plurality of encryption alp... | 12/15/1998 |
| 5825516 | Optical power meter for detecting loss factors in fiber optic communications An optical power meter for a fiber optic link includes a photodetector that generates a current proportional to the energy of the light transmission in the fiber optic, a current-to-voltage converter that converts the current to a proportional voltage, an... | 10/20/1998 |
| 5757912 | System and method for quantum cryptography In a method of communication using quantum cryptography an encryption alphabet is used for coding signals for transmission on a quantum channel. The encryption alphabet comprises pairs of operators applied successively to single-photon signals transmitted... | 05/26/1998 |
| 5675648 | System and method for key distribution using quantum cryptography A method of communication uses quantum cryptography to encode and decode a signal. A key is distributed on a quantum channel, and information subsequent communicated between the transmitter and receiver on a public channel to determine whether the key has... | 10/07/1997 |
| 5559623 | Method and arrangement for arranging an interception-proof optical link A communication method and system for securely communicating between a first station and a second station over an optical link. Information is transmitted from the first station in a pulse position modulation (PPM) form which has a high proportion of nois... | 09/24/1996 |
