公开(公告)号：US11493710B2

公开(公告)日：2022-11-08

申请号：US16981926

申请日：2019-02-15

Applicant: NEC Corporation

Inventor： Shinya Maruyama

IPC: G02B6/42 ,  G02F1/225 ,  H04B10/07 ,  H04B10/516 ,  H04J14/06 ,  G02F1/21

Abstract: A pluggable optical module according to the present invention includes a pluggable electric connector configured so as to be insertable into and removable from an optical transmission apparatus, and capable of transmitting/receiving a data signal to/from the optical transmission apparatus, a drive unit configured to output first/second driving signals by amplifying the data signal, an optical signal output unit configured to output a first/second optical signal modulated according to the first/second drive signal, a light-intensity monitoring unit configured to monitor intensities of the first/second optical signals, a control unit configured to control a gain of the drive unit so as to adjust a difference between the intensities of the first/second optical signals based on a result of the monitoring by the light-intensity monitoring unit, and a pluggable optical receptor configured so that an optical fiber can be inserted thereinto and removed therefrom, and configured to output the first/second optical signals.

公开(公告)号：US20220352989A1

公开(公告)日：2022-11-03

申请号：US17845934

申请日：2022-06-21

Applicant: Infinera Corporation

Inventor： Steven Joseph Hand ,  Ahmed Awadala ,  Luis A. Perez ,  Vincent G. Dominic ,  Kuang-Tsan Wu

IPC: H04B10/564 ,  H04L1/00 ,  H04B10/516 ,  H04B10/61

Abstract: Optical network systems are disclosed, including systems having transmitters with a digital signal processor comprising forward error correction circuitry that provides encoded first electrical signals based on input data; and power adjusting circuitry that receives second electrical signals indicative of the first electrical signals, the power adjusting circuitry supplying third electrical signals, wherein each of the third electrical signals is indicative of an optical power level of a corresponding to one of a plurality of optical subcarriers output from an optical transmitter.

公开(公告)号：US20220345226A1

公开(公告)日：2022-10-27

申请号：US17763158

申请日：2020-09-16

Applicant: Microsoft Technology Licensing, LLC

Inventor： Kai SHI ,  Paolo COSTA ,  Hitesh BALLANI ,  Istvan HALLER ,  Daniel Jonathan Finchley CLETHEROE ,  Sophie Gloria LANGE ,  Raphael Eric Alfred BEHRENDT ,  Foteini KARINOU ,  Krzysztof JOZWIK

IPC: H04B10/69 ,  H04B10/508 ,  H04B10/516

Abstract: A switching network for effecting point-to-point communication between nodes has a time-varying switching configuration, which causes successive activation and deactivation of multiple channels of the switching network, a first of the channels connecting, when activated, a transmitter node and a first receiver node, and a second of the channels connecting, when activated, the transmitter node and a second receiver node. In a training phase, a method comprises: transmitting from the transmitter node via each channel a known training signal, to cause each receiver node to receive a distorted training signal, using the first distorted training signal and knowledge of the first known training signal to determine respective one or more transmit-side equalizer (EQ) coefficients for each channel, and storing, in memory accessible to the transmitter node, the first transmit-side EQ coefficients, in association with each channel, for use in conducting scheduled communications over the switching network in a communications phase.

公开(公告)号：US11483075B2

公开(公告)日：2022-10-25

申请号：US17127389

申请日：2020-12-18

Applicant: Infinera Corp.

Inventor： Steven William Beacall ,  Sumudu Geethika Edirisinghe

IPC: H04B10/54 ,  H04L27/36 ,  H04B10/516 ,  H04B10/50 ,  H04B17/373 ,  H04L27/38

Abstract: A transmitter block, comprising an optical source, a modulator, a transmission circuit and a control circuit. The optical source has a laser providing an optical signal. The modulator is configured to encode data into the optical signal using an m-quadrature amplitude modulation format. The transmission circuit has circuitry to receive data to be encoded into the optical signal. The transmission circuit has at least one drive circuit supplying driver signals to the modulator to cause the modulator to encode data into the optical signal using the m-quadrature amplitude modulation format. The control circuit supplies control signals to the transmission circuit to cause the transmission circuit to change the m-quadrature amplitude modulation format from a first m-quadrature amplitude modulation format to a second m-quadrature amplitude modulation format based upon predicted degradation of a link to receive modulated data from the modulator.

公开(公告)号：US11476945B2

公开(公告)日：2022-10-18

申请号：US17219269

申请日：2021-03-31

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Sang-Pil Han ,  Sungil Kim ,  Jaegyu Park ,  Minhyup Song

IPC: H04B10/516 ,  H04B10/50 ,  H04B10/548 ,  H04B10/54

Abstract: Disclosed is a multi-channel optical signal generating apparatus, which includes a CW laser that generates a single optical signal, an optical signal processor unit that processes the single optical signal, an oscillator that generates an electrical signal, and an electrical signal processor unit that generates a modulation signal, based on the electrical signal, and the optical signal processor unit includes ‘n’ optical circulators, at least one optical intensity modulator, (m-1) optical phase modulators, and ‘n’ BiODLs, the electrical signal processor unit includes a RF power divider which divides the electrical signal, and ‘m’ RF power amplifiers, the RF power divider divides the electrical signal into ‘m’ divided electrical signals, and the optical signal processor unit modulates and outputs the single optical signal by the at least one optical intensity modulator and the (m-1) optical phase modulators, based on the ‘m’ divided electrical signals divided from the RF power divider.

公开(公告)号：US11467342B1

公开(公告)日：2022-10-11

申请号：US17326524

申请日：2021-05-21

Applicant: The Government of the United States as represented by the Director, National Security Agency

Inventor： Ramesh Bhandari

IPC: G02B6/14 ,  H04B10/25 ,  H04B10/516 ,  G02B6/44

Abstract: The present invention provides a method for converting the topological charge of an orbital angular momentum mode of light to an opposite topological charge by applying the light to a spool of optical fiber having a bend radius R and length L. The length of the fiber used to form the spool is defined by ½ the bend-induced 2π walk-off length Ll,mb(2π). The length of the fiber L and the bend radius R of the spool may be adjusted to account for an ellipticity-induced 2π walk-off length Ll,m3(2π). Using the proportionality rules, Ll,mb(2π)∝R2l and Ll,m3(2π)∝ε−l adjustments to account for ellipticity induced 2π walk-off length Ll,me(2π), or to account for a change in the bend radius ΔR of the spool can be easily determined.

公开(公告)号：US20220303166A1

公开(公告)日：2022-09-22

申请号：US17473537

申请日：2021-09-13

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Deyuan Chan ,  Han Henry Sun ,  Sandy Thomson ,  Kuang-Tsan Wu

IPC: H04L27/36 ,  H04L25/06 ,  H04L1/00 ,  H04L27/34 ,  H04L25/49 ,  H04B10/54 ,  H04B10/516 ,  H04B10/077 ,  H04J14/02

Abstract: Consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. Preferably, each symbol of the codeword is generated during a corresponding clock cycle, such that after n clock cycles, a complete codeword corresponding to the input bit sequence is output. On a receive end of the link, a decoder is provided that outputs the k-bit sequence every n clock cycles. Accordingly, buffers need not be provided at the output of the encoder and the input of the decoder, such that processing of the input sequence, codewords, and output sequence may be achieved efficiently without large buffers and complicated circuitry. Moreover, the input sequence, with any binary alphabet may be matched to a desired output distribution with any arbitrary alphabet. Accordingly, probabilistic constellation shaping may be achieved over constellations of arbitrary size. In addition, relatively long codewords, may be encoded and decoded with the apparatus and method disclosed herein. Accordingly, for a fixed SNR a higher SE (more bits per symbol) can be achieved. Alternatively, for a fixed SE, a lower SNR may be sufficient. Moreover, the resulting SE may be finely tailored to a particular optical link SNR to provide data transmission rates that are higher than the low order modulation formats that would otherwise be employed for optical signals carried by such links.

公开(公告)号：US11444694B2

公开(公告)日：2022-09-13

申请号：US17291228

申请日：2019-11-06

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shuto Yamamoto ,  Akira Masuda ,  Hiroki Taniguchi ,  Yoshiaki Kisaka

IPC: H04J14/02 ,  H04B10/2507 ,  H03M13/41 ,  H04B10/516 ,  H04B10/61 ,  H04L25/49

Abstract: Provided is an optical transmission system that includes an optical transmitter, and an optical receiver. The optical transmitter includes: a signal coding unit configured to perform nonlinear trellis coding, which corresponds to nonlinear calculation, on a symbol sequence; and a modulator configured to modulate the symbol sequence subjected to the nonlinear trellis coding by the signal coding unit, and transmit the modulated symbol sequence to the optical receiver. The optical receiver includes: a light receiving unit configured to receive an optical signal transmitted from the optical transmitter, and convert the received optical signal into an electrical signal; and a digital signal processing unit configured to perform digital signal processing on the electrical signal to reconstruct the symbol sequence.

公开(公告)号：US11424824B2

公开(公告)日：2022-08-23

申请号：US17270713

申请日：2019-08-14

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Hiroki Kawahara ,  Kohei Saito ,  Takeshi Seki ,  Tsutomu Kubo

IPC: H04B10/07 ,  H04B10/079 ,  H04B10/516 ,  H04J14/02

Abstract: An OSNR spectrum estimation apparatus includes an OSNR estimation unit configured to cause an optical node to estimate an OSNR of a predetermined transmission line using a probe light of a predetermined wavelength in a predetermined number of wavelength channels, the predetermined number being less than the number of all wavelength channels; and an OSNR spectrum calculation unit configured to calculate an OSNR spectrum of all the wavelength channels from OSNRs of the predetermined number of wavelength channels measured by the optical node.

公开(公告)号：US20220263582A1

公开(公告)日：2022-08-18

申请号：US17645001

申请日：2021-12-17

Applicant: Celestial AI Inc.

Inventor： Yangjin Ma ,  Nikolaos Pleros ,  David Lazovsky ,  George Giamougiannis ,  Apostolos Tsakyridis ,  Angelina Totovic ,  Martinus Bos ,  Philip Winterbottom

IPC: H04B10/516 ,  H04B10/61 ,  H04J14/02

Abstract: Vector and matrix multiplications can be accomplished in photonic circuitry by coherently combining light that has been optically modulated, in amplitude and/or phase, in accordance with the vector and matrix components. Disclosed are various beneficial photonic circuit layouts characterized by loss- and delay-balanced optical paths. In various embodiments, loss balancing across paths is achieved with suitable optical coupling ratios and balanced numbers of waveguide crossings (using dummy crossings where needed) across the paths. Delays are balanced in some embodiments with geometrically delay-matched optical paths.