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| Number | Title | Issue Date |
| 8184988 | Optical modulating device with frequency multiplying technique for electrical signals The present invention relates to an optical modulating device with frequency multiplying technique for electrical signals, which primary comprises a mixer, which generates a mixed data signal from a first electrical signal and a second electrical signal. The mixed d... | 05/22/2012 |
| 8064775 | Generation of at least 100 Gbit/s optical transmission A method includes generating at least two lightwave carriers from a lightwave source, the carriers having a wavelength spacing, creating an up-subchannel and a down-subchannel orthogonal to one another and spaced apart based on the fixed wavelength spacing from modu... | 11/22/2011 |
| 8064776 | Dispersion tolerant optical system and method An optical communication system and method of use are described. The system comprises an optical source adapted to receive a digitally encoded data signal comprising sequences of data at a data rate (B) and comprising two signal levels representing a first state and... | 11/22/2011 |
| 8014684 | Modulation light signal generating device and FSK modulation signal generating device The object of the present invention is to provide a modulated optical signal generator utilizing the mechanism of a multiply optical modulator, and a modulated signal generator capable of outputting millimeter waves and the like utilizing the modulated optical signa... | 09/06/2011 |
| 7526209 | Optical frequency shift keying modulator An optical FSK modulator which can be used for an optical information communication is provided. The optical FSK is provided with: a second sub Mach-Zehnder waveguide (MZB) 3; a main Mach-Zehnder waveguide (MZC) 4 including the MZ... | 04/28/2009 |
| 7424228 | High dynamic range radio frequency to optical link A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential drive signal from an input signal and delivers the differential drive s... | 09/09/2008 |
| 7421209 | Optical wavelength multiplexing FSK modulation method An optical wavelength multiplexing frequency shift keying modulation system. The system includes an optical wavelength multiplexing signal acquisition unit for outputting an optical wavelength multiplexing signal. A n optical frequency shift keying modulation unit a... | 09/02/2008 |
| 7415212 | Data communication system, data transmitter and data receiver A transmitter formed of two or more light-emitting sections such as LEDs, which are physically arranged in a predetermined manner, is disposed in the real world object, and each light-emitting section transmits data by flashing at a flashing pattern representing the... | 08/19/2008 |
| 7412173 | Apparatus for generating optical carrier suppressed return-to-zero An apparatus for generating a Carrier-Suppressed Return-to-Zero (CS-RZ) signal is disclosed. The apparatus includes a mixer, a Low Pass Filter (LPF), a driver amplifier and a single external modulator. The mixer generates a modulator input by mixing data with a half... | 08/12/2008 |
| 7406267 | Method and apparatus for transmitting a signal using thermal chirp management of a directly modulated transmitter A fiber optic transmitter comprising a digital driver adapted to adjust the crossing point of a digital base signal, an optical source adapted to receive the digital base signal and produce a frequency modulated optical signal, and an optical spectrum reshaper adapt... | 07/29/2008 |
| 7398022 | Optical return-to-zero phase-shift keying with improved transmitters An apparatus and a method for transmitting at least a digital optical signal with return-to-zero phase-shift keying, employing a single optical modulator with dual-drive design, the encoded optical signal having improved spectral efficiency and performances and bein... | 07/08/2008 |
| 7398023 | Method and apparatus for bias and alignment control in an optical signal transmitter A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation format. Output power in dither signals applied to the bias signals m... | 07/08/2008 |
| 7394985 | Wavelength access server (WAS) architecture A wavelength access server (WAS) architecture provides aggregation of traffic streams of diverse data communication protocols as well as provision of wavelength resources in an optical transport network. The WAS provides functions such as service traffic adaptation,... | 07/01/2008 |
| 7391550 | Method and apparatus for optical broadband frequency chirp Techniques for producing an optical broadband frequency sweep or chirp, include generating a narrowband frequency chirp and a frequency-shifted replica. The narrowband chirp has an optical carrier frequency, a pulse duration and a pulse bandwidth. A frequency-shifte... | 06/24/2008 |
| 7391978 | Optical signal transmitter and optical signal transmission system The invention provides an optical signal transmitter low in noise and in distortion and provides an optical signal transmission system using this optical signal transmitter. The optical signal transmitter includes a plurality of frequency modulation means for... | 06/24/2008 |
| 7389053 | Tunable filtering of RF or microwave signals based on optical filtering in Mach-Zehnder configuration Devices and techniques for achieving signal filtering in RF or microwave frequencies by optical filtering using two separate optical paths. Each optical path may include one or more optical resonators to achieve desired optical filtering. ... | 06/17/2008 |
| 7382986 | Signal converter, optical transmitter and optical fiber transmission system The signal converter of the present invention receives a multichannel video signal and converts the video signal into a microwave signal, the phase of which has been modulated with the video signal. The signal converter includes: a laser light source; a modulating s... | 06/03/2008 |
| 7382524 | Photo-electronic frequency multiplier An exemplary photo-electronic frequency multiplier (100) includes an intervening optical signal generator (10), a pair of photo-electronic conversion circuits (21, 22), a differential amplifier circuit (30), and a signal processing circui... | 06/03/2008 |
| 7376352 | Chirp managed laser fiber optic system including an adaptive receiver A fiber optic communication system comprising: an optical signal source adapted to produce a frequency modulated signal; and an optical spectrum reshaper (OSR) adapted to convert the frequency modulated signal into... | 05/20/2008 |
| 7376358 | Location specific optical monitoring An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and launching the spike signal into the a transmitter end of the optical l... | 05/20/2008 |
| 7376356 | Optical data transmission system using sub-band multiplexing In accordance with the invention, an optical data transmission system of enhanced flexibility is provided by sub-band multiplexing of a WDM channel. Specifically, an exemplary optical data transmission system comprises an optical source for generating a plurality of... | 05/20/2008 |
| 7373091 | Multicasting optical switch fabric and method of detection based on novel heterodyne receiver The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, wh... | 05/13/2008 |
| 7373086 | Standard radio frequency signal generating method and standard radio frequency signal generating device With a single laser light source, the line width of a beat signal is set to a few tens of kHz or less without it fluctuating over time, and the frequency thereof is set as desired. CW light from a CW laser light source is input into an electroabsorption modulator to... | 05/13/2008 |
| 7373084 | Optical network termination device for use in passive optical network based on WDM/SCM scheme A termination device for use in a WDM-SCM PON system can effectively support a multi-channel integration function of a WDM/SCM PON system. The termination device contained in a termination end of a WDM/SCM (Wavelength Division Multiplexing/Sub-Carrier Multiplexing) ... | 05/13/2008 |
| 7352968 | Chirped managed, wavelength multiplexed, directly modulated sources using an arrayed waveguide grating (AWG) as multi-wavelength discriminator There is provided a fiber optic system comprising: a multi-wavelength source adapted to generate frequency modulated signals having different wavelengths, λ1, λ2, . . . , λn; and | 04/01/2008 |
| 7340183 | Optical communications systems, devices, and methods A method of transmitting an optical communications signal, comprising receiving a first signal, encoding the signal with a differential or duobinary encoding scheme, encoding the signal with an oscillating signal component, and sub-carrier modulating the signal onto... | 03/04/2008 |
| 7336605 | Bandwidth allocation for link aggregation A method for establishing a connection with a guaranteed bandwidth for transmitting data over a logical link that includes a plurality of parallel physical links between first and second endpoints. A link bandwidth is allocated on each of the physical communication ... | 02/26/2008 |
| 7330611 | Method and apparatus for enhancing the extinction ratio in mode converters A method and apparatus for optimizing a non-ideal, real mode converter to substantially achieve the performance of an ideal mode converter. The method consists of optimizing the input linear polarization to the mode converter to balance the power in the principal mo... | 02/12/2008 |
| 7330665 | Optical frequency modulated transmitter An optical frequency modulated transmitter includes a plurality of separately phased-controlled slave lasers, the outputs of which are combined to form a single output beam of the transmitter. A master optical oscillator outputs an optical signal for injection locki... | 02/12/2008 |
| 7324760 | Apparatus and method for phase synchronization control in RZ optical transmitter An optical RZ transmitter comprises an optical signal source and a pair of electro-optical modulators in tandem, one arranged to receive a NRZ electrical data signal and the other a clock signal at the data rate of the data signal. The phase difference between the d... | 01/29/2008 |
| 7317845 | Optical modulator having reduced bandwidth requirements and method of operation thereof An optical modulator is overdriven to increase its nonlinearity and therefore improve its response as it pertains to differential phase shift keyed (DPSK) transmission and a method of operating the same. In one embodiment, the MZM includes an MZM drive circuit coupl... | 01/08/2008 |
| 7305189 | Phase modulation for an optical transmission system A data modulation apparatus is proposed that includes a data modulator (20) for modulating data onto an optical signal at a predetermined bit rate. The resulting encoded optical signal is phase modulated by a phase modulator (50) that is driven by at l... | 12/04/2007 |
| 7302185 | Device and method for millimeter wave detection and block conversion The device includes a first fiber optic transmitter (FOT) to receive a millimeter wave (MMW) signal and to generate a multiple sideband optical signal, and a second FOT to generate a second optical signal, from a reference signal. A first wavelength division multipl... | 11/27/2007 |
| 7292792 | High speed modulation of optical subcarriers A method for transmitting digital data includes splitting a coherent optical carrier having a subcarrier into mutually coherent optical carriers, producing corresponding sequences of phase shifts in each of the mutually coherent optical carriers, and then, interferi... | 11/06/2007 |
| 7286734 | Optical microresonator with coupling elements for changing light direction An optical microresonator includes a microcylinder and resonant waveguide formed on the microcylinder as a plurality of spaced resonant elements, for example, spaced ridges, and coupling elements operative with the resonant elements for optically coupling light from... | 10/23/2007 |
| 7280721 | Multi-ring resonator implementation of optical spectrum reshaper for chirp managed laser technology There is provided a fiber optic transmission system, comprising: an optical signal source adapted to produce a frequency modulated signal; and a multi-ring resonator optical spectrum reshaper (OSR) adapted to conve... | 10/09/2007 |
| 7277645 | High-bit-rate long-haul fiber optic communication system techniques and arrangements A 90 degree Alternate-Phase (AP) on-off keying (OOK) transmission format for high bit rate, long-haul optical transmission systems employing a chirped or a chirp-free pulse stream generated by a pulse generator (e.g., Mach Zehnder modulator) driven by mixing two ele... | 10/02/2007 |
| 7266301 | Interference resistant repeater systems including controller units A repeater unit is provided that includes a receiver module and a controller unit. The receiver module is responsive to an infrared signal. The controller unit is adapted to determine whether a signal based on the infrared signal corresponds to a remote control sign... | 09/04/2007 |
| 7263137 | Multivalued FSK modulation system A multivalued FSK modulation system is provided in which when data to be transmitted is multivalued and transmitted/received, the detection level is different every symbol. When a two-valued signal is transmitted as one symbol, data (11), (01), (00) and (10) are pre... | 08/28/2007 |
| 7263287 | Method and apparatus for assessing performance of optical systems An apparatus for accelerating assessment of an optical transmission system using Bit Error Rate (BER) tests calculates Q-factors for at least two different extinction ratios from measured test BER values, and extrapolates to determine a Q-factor for an operational e... | 08/28/2007 |
