| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 121 | OPTICAL DIGITAL-TO-ANALOG CONVERSION | EP09779061.2 | 2009-02-16 | EP2396698A1 | 2011-12-21 | PORZI, Claudio; POTI, Luca; BOGONI, Antonella |
| The present invention relates to Digital-to-Analog conversion in the optical or photonic domain. The present invention provides a digital-to-analog converter (DAC) (100) arranged to receive an N-bit digital optical signal (105) and to process the N-bit digital optical signal to generate an analog optical signal (110). The DAC comprises a photonic circuit (120a, 120b) arranged to adjust the amplitude of each bit of the N-bit digital optical signal dependent on the amplitudes of at least one of the other bits of the N-bit digital optical signal. The amplitudes are adjusted using a non-linear optical effect in order to generate respective outputs for each bit. The DAC also comprises a photonic combiner (145) arranged to combine the outputs for each bit to generate the analog output signal (110). | ||||||
| 122 | OPTICAL FLIP-FLOP | EP08749762.4 | 2008-04-25 | EP2269115B1 | 2011-12-21 | BERRETTINI, Gianluca; MALACARNE, Antonio; POTI, Luca; BOGONI, Antonella |
| An optical flip-flop comprises first (102) and second (104) flip-flop elements arranged to respectively provide first (output 1) and second (output 3) optical outputs. Each output is in one of a plurality of states, wherein switching the output from a relatively high power state to a relatively low power state has an associated falling edge transition time, and switching the output from a relatively low power state to a relatively high power state has an associated rising edge transition time. The rising edge transition time is greater than the falling edge transition time. The optical flip-flop also comprises a processor (106) arranged to process the first and second outputs to provide an optical flip-flop output, being one of a plurality of state outputs, wherein switching the flip-flop output froma relatively high power state to a relatively low power state has an associated falling edge transition time, and switching the flip-flop output froma relatively low power state to a relatively high power state has an associated rising edge transition time. The processor is arranged to process the first and second outputs such that both the falling edge transition time and the rising edge transition time of the flip-flop output are independent of the rising edge transitiontimes of boththe first and second flip-flop elements. The invention also provides a method of operating the flip-flop, an optical switching arrangement and an optical switching method. | ||||||
| 123 | OPTICAL ANALOGUE TO DIGITAL CONVERTER | EP08875253.0 | 2008-10-31 | EP2356512A1 | 2011-08-17 | BOGONI, Antonella; POTI, Luca; SCAFFARDI, Mirco; LAZZERI, Emma; FRESI, Francesco |
| An analogue to digital converter (100) is arranged to receive and process an analogue optical input signal (110) to produce an N bit digital optical output signal (140) quantised to 2 N levels, where N is greater than or equal to 2. The converter (100) has an input (115) for receiving the optical input signal (110) and N processing channels (131, 132, 133) which are each coupled to the input, at least one of said processing channels comprising an optical processing circuit (201, 202, 203, 204, 205, 206, 207) arranged to generate a plurality of digital optical output signals. The optical processing circuit is arranged to change the state of each digital optical output signal corresponding to a respective different value of the analogue optical input signal, and an optical combining circuit (301, 302, 303, 304) for combining the optical output signals in order to generate one bit of the N-bit digital optical signal. | ||||||
| 124 | Optical signal processing device and method of processing optical signal | EP09178024.7 | 2009-12-04 | EP2224625A1 | 2010-09-01 | Futami, Fumio |
An optical signal processing device for shaping a waveform of an optical signal, including: an intensity inversion wavelength converter (102) configured to generate an intensity-modulated optical signal of a second wavelength obtained by inverting a signal intensity of an input intensity-modulated optical signal of a first wavelength; an optical coupler (103) configured to multiplex the intensity-modulated optical signal of the first wavelength and the intensity-modulated optical signal of the second wavelength at a timing at which signal intensities of those signals become opposite; and an optical limiter (104) configured to input coupled light output from the optical coupler (103), and suppress gain as power of the coupled light becomes higher.
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| 125 | OPTICAL PROCESSING APPARATUS | EP06829888.4 | 2006-12-28 | EP2126626A1 | 2009-12-02 | BOGONI, Antonella; POTI, Luca; SCAFFARDI, Mirco |
| An optical 1-bit comparator has at least two inputs for receiving a respective first input signal A and a second input signal B, each comprising a single bit word, and at least three outputs, each of the three outputs providing a respective solution to the logical expressions: A > B, A < B and A = B, characterised in that each logical expression is obtained using at least one semiconductor optical amplifier (SOA) capable of providing cross gain modulation. Preferably the complete circuit requires only 3 identical SOAs to provide the three logical outputs, each operating with cross gain modulation. | ||||||
| 126 | OPTICAL SIGNAL AMPLIFYING TRIODE AND, OPTICAL SIGNAL TRANSFER METHOD, OPTICAL SIGNAL RELAY DEVICE, AND OPTICAL SIGNAL STORAGE DEVICE USING THE SAME. | EP03809436 | 2003-09-19 | EP1560062A4 | 2007-05-09 | MAEDA YOSHINOBU |
| When in an optical signal amplifying triode 10, light of a second wavelength lambda 2, selected from among light from a first optical amplifier 26, into which a first input light L1 of a first wavelength lambda 1 and a second input light L2 of second wavelength lambda 2 have been input, and a third input light (control light) L3 of a third wavelength lambda 3 are input into a second optical amplifier 34, an output light L4 of the third wavelength lambda 3, selected from among the light output from the second optical amplifier 34, is light that is modulated in response to the intensity variation of one or both of the first input light L1 of the first wavelength lambda 1 and the third input light L3 of the third wavelength lambda 3 and is an amplified signal, with which the signal gain with respect to the third input light (control light) L3 of the third wavelength lambda 3 is of a magnitude of 2 or more. An optical signal amplifying triode 10, which can directly perform an optical signal amplification process using control input light, can thus be provided. <IMAGE> | ||||||
| 127 | Optical pulse pattern generator | EP02259015.2 | 2002-12-30 | EP1328077B1 | 2006-06-14 | Takiguchi, Koichi, c/o NTT IP Center; Shibata, Tomohiro, c/o NTT IP Center |
| 128 | Optical amplifier | EP02022533.0 | 2002-10-07 | EP1300918A3 | 2004-01-07 | Shibata, Yasuo; Kikuchi, Nobuhiro; Oohashi, Hiromi; Thomori, Yuichi |
An optical amplifier includes a first optical path, second optical path, semiconductor optical amplifier, and multi-mode interference 3-dB coupler. The first optical path guides oscillation light. The second optical path guides signal light. The semiconductor optical amplifier causes oscillation on the first optical path. The multi-mode interference 3-dB coupler crosses the first and second optical paths in the gain medium of the semiconductor optical amplifier. |
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| 129 | Optical pulse pattern generator | EP02259015.2 | 2002-12-30 | EP1328077A2 | 2003-07-16 | Takiguchi, Koichi, c/o NTT IP Center; Shibata, Tomohiro, c/o NTT IP Center |
An optical pulse pattern generator can generate optical pulse signals with various periods and patterns. It supplies an optical pulse from an optical pulse source (9) to a variable optical delay line circuit including cascade-connected characteristic-variable asymmetrical Mach-Zehnder interferometers (102 and 103) via an optical combiner and splitter (101). The optical pulse is fed back to the optical combiner and splitter (101) from the final stages of the cascade-connected characteristic-variable a symmetrical Mach-Zehnder interferometers (102 and 103) via an optical exclusive OR circuit (104) and optical amplifier (14). Making directional couplers with variable coupling ratio (11-1 to 11-5 and 11-7 to 11-11), and directional couplers with variable coupling ratio (11-6 and 11-12) in operation can cause the final stage of the cascade-connected characteristic-variable asymmetrical Mach-Zehnder interferometer (103) to produce a random pulse train. |
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| 130 | Optical amplifier | EP02022533.0 | 2002-10-07 | EP1300918A2 | 2003-04-09 | Shibata, Yasuo; Kikuchi, Nobuhiro; Oohashi, Hiromi; Thomori, Yuichi |
An optical amplifier includes a first optical path, second optical path, semiconductor optical amplifier, and multi-mode interference 3-dB coupler. The first optical path guides oscillation light. The second optical path guides signal light. The semiconductor optical amplifier causes oscillation on the first optical path. The multi-mode interference 3-dB coupler crosses the first and second optical paths in the gain medium of the semiconductor optical amplifier. |
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| 131 | All-optical timing recovery | EP97309353.7 | 1997-11-20 | EP0854379A2 | 1998-07-22 | Kim, Byron Roberts |
Optical timing detection, for phase comparison of optical signals, or clock recovery is achieved by arranging an interferometer to be responsible to data transitions. A pulse train is fed into both arms of the interferometer. An optical amplifier (20) enables the interference condition to be changed when the data is fed into one arm. The output changed if the data transitions lose synchronisation with the pulse train. |
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| 132 | Self-tuned silicon-photonic WDM transmitter | US15346565 | 2016-11-08 | US10120211B2 | 2018-11-06 | Xuezhe Zheng; Ying Luo; Ashok V. Krishnamoorthy |
| An optical transmitter includes: a set of reflective silicon optical amplifiers (RSOAs), a set of ring modulators, a shared broadband reflector, a set of intermediate waveguides, and a shared waveguide. Each intermediate waveguide channels light from an RSOA in proximity to an associated ring modulator to cause optically coupled light to circulate in the associated ring modulator. The shared waveguide is coupled to the shared broadband reflector, and passes in proximity to the set of ring modulators, so that light circulating in each ring modulator causes optically coupled light to flow in the shared optical waveguide. During operation, each RSOA forms a lasing cavity with the shared broadband reflector, wherein each lasing cavity has a different wavelength, which is determined by a resonance of the associated ring modulator. The different wavelengths are combined in the shared waveguide to produce a combined output. | ||||||
| 133 | WAVELENGTH-TUNABLE III-V/Si HYBRID OPTICAL TRANSMITTER | US15357358 | 2016-11-21 | US20180143461A1 | 2018-05-24 | Xuezhe Zheng; Ying Luo; Jin Yao; Ashok V. Krishnamoorthy |
| An optical transmitter includes a reflective semiconductor optical amplifier (RSOA) coupled to an input end of a first optical waveguide. An end of the first optical waveguide provides a transmitter output for the optical transmitter. Moreover, a section of the first optical waveguide between the input end and the output end is optically coupled to a ring modulator that modulates an optical signal based on an electrical input signal. A passive ring filter (or a 1×N silicon-photonic switch and a bank of band reflectors) is connected to provide a mirror that reflects light received from the second optical waveguide back toward the RSOA to form a lasing cavity. Moreover, the ring modulator and the passive ring filter have different sizes, which causes a Vernier effect that provides a large wavelength tuning range for the lasing cavity in response to tuning the ring modulator and the passive ring filter. | ||||||
| 134 | Dual-ring-modulated laser that uses push-pull modulation | US15421300 | 2017-01-31 | US09939663B2 | 2018-04-10 | Ying Luo; Shiyun Lin; Ashok V. Krishnamoorthy; Jock T. Bovington; Xuezhe Zheng |
| A dual-ring-modulated laser includes a gain medium having a reflective end coupled to a gain-medium reflector and an output end coupled to a reflector circuit to form a lasing cavity. This reflector circuit comprises: a first ring modulator; a second ring modulator; and a shared waveguide that optically couples the first and second ring modulators. The first and second ring modulators have resonance peaks, which are tuned to have an alignment separation from each other. During operation, the first and second ring modulators are driven in opposing directions based on the same electrical input signal, so the resonance peaks of the first and second ring modulators shift wavelengths in the opposing directions during modulation. The modulation shift for each of the resonance peaks equals the alignment separation, so the resonance peaks interchange positions during modulation to cancel out reflectivity changes in the lasing cavity caused by the modulation. | ||||||
| 135 | Systems and methods for optical frequency comb generation using a microring resonator | US15399321 | 2017-01-05 | US09891500B1 | 2018-02-13 | Sai Tak Chu; Kun Zhu |
| Systems and methods which provide for the generation of optical frequency combs using a microring resonator optical frequency comb generator configuration are described. A microring resonator optical frequency comb generator configuration of embodiments comprises a plurality of fiber loop laser cavities and at least one microring cavity are utilized. For example, an optical frequency comb generator may include a first fiber loop laser cavity, a second fiber loop laser cavity that is symmetrical with the first fiber loop laser cavity, and a microring resonator that is coupled into both of the first and second fiber loop laser cavities. The microring resonator may be configured to provide a high quality factor, Q, value. The microring resonator of embodiments works together with optical bandpass filters and amplifiers in the multiple fiber loops to make the generated optical frequency comb stable and flexible. | ||||||
| 136 | Fast wavelength-tunable hybrid optical transmitter | US15357452 | 2016-11-21 | US09812845B1 | 2017-11-07 | Jin-Hyoung Lee; Xuezhe Zheng; Daniel Y. Lee; Ying Luo; Ashok V. Krishnamoorthy |
| An optical transmitter includes: a set of reflective semiconductor optical amplifiers (RSOAs) or other reflective gain media, a set of ring filters, a set of intermediate waveguides, a shared waveguide, a shared loop mirror, and an output waveguide. Each intermediate waveguide channels light from an RSOA in proximity to an associated ring filter to cause optically coupled light to circulate in the associated ring filter. The shared waveguide is coupled to the shared loop mirror, and is located in proximity to the set of ring filters, so that light circulating in each ring filter causes optically coupled light to flow in the shared waveguide. Each RSOA forms a lasing cavity with the shared loop reflector, wherein each lasing cavity has a different wavelength associated with a resonance of its associated ring filter. The output waveguide is optically coupled to the shared loop mirror and includes an electro-optical modulator. | ||||||
| 137 | OPTICAL MODULATOR | US15416719 | 2017-01-26 | US20170146886A1 | 2017-05-25 | Yusuke SAITO; Takehito Tanaka |
| The present invention provides an optical modulator, which can be reduced in size with size reduction of an optical waveguide and electric wiring as compared to a conventional optical modulator. An optical modulator according to an embodiment includes a substrate; an optical waveguide provided on the substrate and configured to guide light; a modulation unit formed of part of the optical waveguide and configured to modulate the light; and electric wires provided on the substrate and configured to supply a high-frequency electric signal to the modulation unit. One end portion and another end portion of the optical waveguide are provided on a first end surface, one end portion of the electric wiring is provided along the first end surface, another end portion of the electric wiring is provided along a second end surface being different from the first end surface. | ||||||
| 138 | DUAL-RING-MODULATED LASER THAT USES PUSH-PULL MODULATION | US15421300 | 2017-01-31 | US20170139237A1 | 2017-05-18 | Ying Luo; Shiyun Lin; Ashok V. Krishnamoorthy; Jock T. Bovington; Xuezhe Zheng |
| A dual-ring-modulated laser includes a gain medium having a reflective end coupled to a gain-medium reflector and an output end coupled to a reflector circuit to form a lasing cavity. This reflector circuit comprises: a first ring modulator; a second ring modulator; and a shared waveguide that optically couples the first and second ring modulators. The first and second ring modulators have resonance peaks, which are tuned to have an alignment separation from each other. During operation, the first and second ring modulators are driven in opposing directions based on the same electrical input signal, so the resonance peaks of the first and second ring modulators shift wavelengths in the opposing directions during modulation. The modulation shift for each of the resonance peaks equals the alignment separation, so the resonance peaks interchange positions during modulation to cancel out reflectivity changes in the lasing cavity caused by the modulation. | ||||||
| 139 | Three port transceiver | US13733108 | 2013-01-02 | US09195079B2 | 2015-11-24 | Christopher Doerr; Benny Mikkelsen; Eric Swanson |
| An optical coherent transceiver comprising a polarization and phase-diversity coherent receiver and a polarization and phase-diversity modulator on the same substrate interfaced by three grating couplers, on grating coupler coupling in a signal, one grating coupler coupling in a laser signal, and a third grating coupler coupling out a modulated signal. | ||||||
| 140 | Optical analogue to digital converter | US13127085 | 2008-10-31 | US08514115B2 | 2013-08-20 | Antonella Bogoni; Francesco Fresi; Emma Lazzeri; Mirco Scaffardi; Luca Poti |
| An analogue to digital converter is arranged to receive and process an analogue optical input signal to produce an N bit digital optical output signal quantised to 2N levels, where N is greater than or equal to 2. The converter has an input for receiving the optical input signal and N processing channels which are each coupled to the input, at least one of said processing channels comprising an optical processing circuit arranged to generate a plurality of digital optical output signals. The optical processing circuit is arranged to change the state of each digital optical output signal corresponding to a respective different value of the analogue optical input signal, and an optical combining circuit for combining the optical output signals in order to generate one bit of the N-bit digital optical signal. | ||||||
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