WO2023178517A1 - Modulateur optique, appareil d'émission, système de communication et procédé de modulation - Google Patents

Modulateur optique, appareil d'émission, système de communication et procédé de modulation Download PDF

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Publication number
WO2023178517A1
WO2023178517A1 PCT/CN2022/082288 CN2022082288W WO2023178517A1 WO 2023178517 A1 WO2023178517 A1 WO 2023178517A1 CN 2022082288 W CN2022082288 W CN 2022082288W WO 2023178517 A1 WO2023178517 A1 WO 2023178517A1
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optical
optical signal
signal
electro
phase shifter
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PCT/CN2022/082288
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English (en)
Chinese (zh)
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秦扬
吴阳博
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华为技术有限公司
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Priority to PCT/CN2022/082288 priority Critical patent/WO2023178517A1/fr
Publication of WO2023178517A1 publication Critical patent/WO2023178517A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference

Definitions

  • the present application relates to the field of communication technology, and in particular, to an optical modulator, a transmitting device, a communication system and a modulation method.
  • FIG. 1 is a schematic diagram of the chirp characteristics of optical signals. As shown in Figure 1, the abscissa represents time changes, and the ordinate represents the frequency of the optical signal. Optical signals will exhibit chirp characteristics during transmission, that is, the instantaneous frequency of the optical signal will change with time. When signals are transmitted over a certain distance in optical fibers, due to different transmission rates, the signals will disperse from each other, resulting in pulse broadening and signal waveform distortion, which is called dispersion. The existence of optical fiber dispersion causes the transmission signal pulse to be distorted, limiting the transmission capacity and transmission bandwidth of the optical fiber.
  • dispersion will cause inter-code interference, increase the bit error rate, and ultimately lead to a decrease in the transmission capacity of the optical fiber communication system.
  • the chirped characteristics of optical signals can even lead to increased dispersion. Therefore, how to compensate for dispersion is an urgent problem to be solved in optical fiber transmission.
  • This application provides an optical modulator, a transmitting device, a communication system and a modulation method to achieve dispersion compensation, thereby achieving high-speed, large-capacity, and long-distance communications.
  • the present application provides an optical modulator.
  • the optical modulator includes an optical splitter, a first electro-optical phase shifter, a second electro-optical phase shifter and a combiner, wherein the first electro-optical phase shifter and the second electro-optical phase shifter are arranged between the optical splitter and the combiner.
  • the optical splitter includes a signal input end, a first output end and a second output end.
  • the light splitting ratio between the first output terminal and the second output terminal is 1:m, where m ⁇ 1.
  • the combiner includes a first input terminal, a second input terminal and a signal output terminal.
  • the first electro-optical phase shifter can be connected to the first output terminal
  • the second electro-optical phase shifter can be connected to the second output terminal.
  • the optical splitter receives the optical signal through the signal input end, and divides the optical signal into a first optical signal and a second optical signal according to the above-mentioned splitting ratio.
  • the first optical signal is output from the first output terminal
  • the second optical signal is output from the second output terminal.
  • the first electro-optical phase shifter performs first phase modulation on the first optical signal
  • the second electro-optical phase shifter performs second phase modulation on the second optical signal.
  • the first optical signal after the first phase modulation enters the combiner through the first input end
  • the second optical signal after the second phase modulation enters the combiner through the second input end.
  • the combiner is used for combining the phase-modulated first optical signal and the second optical signal to form a modulated optical signal. Finally, the combiner outputs the modulated optical signal from the signal output end.
  • the modulated optical signal output by the optical modulator has been phase modulated and pre-compensated. Therefore, even if the modulated optical signal undergoes dispersion during long-distance transmission in the optical fiber link, the phase modulation of the optical signal by the optical modulator and Pre-compensation can also compensate for dispersion, thereby enabling high-speed, large-capacity, and long-distance communications.
  • the specific type of the above-mentioned spectrometer is not limited.
  • it can be a multi-mode interferometer, a coupler or a Mach-Zehnder interferometer.
  • the optical splitter may be a coupler.
  • the type of coupler is not limited, for example, it can be a Y-type coupler or a directional coupler.
  • the spectrometer may also be a Mach-Zehnder interferometer.
  • the number of Mach-Zehnder interferometers is not limited.
  • the light modulator may include at least two Mach-Zehnder interferometers connected in series.
  • the light splitting ratio of the above-mentioned Mach-Zehnder interferometer may be adjustable.
  • a Mach-Zehnder interferometer may be of the thermally tuned type.
  • the light modulator also includes a heater, and the heater is arranged corresponding to the Mach-Zehnder interferometer.
  • the heater is used to heat the Mach-Zehnder interferometer, so that the spectroscopic ratio of the Mach-Zehnder interferometer changes with temperature.
  • the Mach-Zehnder interferometer can be of the electrically modulated type. By applying different voltages or currents to the Mach-Zehnder interferometer, the concentration of carriers in the Mach-Zehnder interferometer can be changed, thereby changing the refraction of the optical signal, thereby adjusting the light splitting ratio.
  • the splitting ratio between the first input terminal and the second input terminal may be 1:n.
  • the specific value of n is not limited.
  • n can be equal to m, or n can also be equal to 1.
  • the first electro-optical phase shifter and the second electro-optical phase shifter can be arranged in parallel, which can reduce the size of the first electro-optical phase shifter and the second electro-optical phase shifter, which is beneficial to the miniaturization of the optical modulator.
  • this application provides a launching device.
  • the transmitting device includes a housing, a circuit board and the light modulator of the first aspect.
  • the light modulator and the circuit board are arranged in the housing, and the light modulator is arranged on the circuit board.
  • the optical splitter divides the input optical signal into a first optical signal and a second optical signal
  • the first electro-optical phase shifter performs first phase modulation on the first optical signal
  • the second electro-optical phase shifter performs first phase modulation on the first optical signal.
  • the two optical signals undergo second phase modulation.
  • the phase shift of the first optical signal is different from that of the second optical signal.
  • the phase shifts will not completely cancel out. Therefore, compared with the input optical signal, the final output modulated optical signal will be superimposed with additional phase modulation, thereby achieving pre-compensation.
  • the modulation of the optical signal by the optical modulator can compensate for the dispersion, so that the quality of the modulated optical signal received by the receiving device is better, thereby achieving high speed and large capacity. , long-distance communication.
  • this application provides a communication system.
  • the communication system includes a receiving device, an optical fiber link and a transmitting device of the second aspect, and the optical fiber link connects the transmitting device and the receiving device.
  • the modulated optical signal emitted by the transmitting device will undergo dispersion after long-distance transmission in the optical fiber link.
  • the pre-compensation of the optical signal by the optical modulator can compensate for the dispersion, thereby making the receiving
  • the quality of the modulated optical signal received by the device is better, enabling high-speed, large-capacity, and long-distance communications.
  • the present application provides a modulation method.
  • the modulation method is performed using the optical modulator of the first aspect.
  • modulation methods include:
  • the optical splitter receives the optical signal from the signal input end
  • the optical splitter divides the optical signal into a first optical signal and a second optical signal, and the splitting ratio of the first optical signal and the second optical signal is 1:m, where m>0 and m ⁇ 1;
  • the first electro-optical phase shifter performs first phase modulation on the first optical signal
  • the second electro-optical phase shifter performs second phase modulation on the second optical signal
  • the combiner performs multiplexing processing on the first optical signal modulated by the first phase and the second optical signal modulated by the second phase to obtain the modulated optical signal and output it.
  • the optical signal is phase modulated and pre-compensated before entering the fiber link. Therefore, even in long-distance transmission scenarios of optical fiber links, dispersion can be compensated to achieve high-speed, large-capacity, and long-distance communications.
  • Figure 1 is a schematic diagram of the chirp characteristics of optical signals
  • Figure 2 is a schematic structural diagram of an optical modulator in an embodiment of the present application.
  • Figure 3 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • Figure 4 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • Figure 5 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • Figure 6 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • Figure 7 is a schematic structural diagram of a transmitting device in an embodiment of the present application.
  • Figure 8 is a schematic structural diagram of a communication system in an embodiment of the present application.
  • Figure 9 is a schematic flowchart of the modulation method in the embodiment of the present application.
  • dispersion compensation technologies commonly used in optical fiber transmission mainly include optical domain dispersion compensation and electrical domain dispersion compensation.
  • optical domain dispersion compensation usually uses dispersion compensation optical fiber.
  • Dispersion compensating fiber is a fiber with negative dispersion. It can be added to the existing G652 standard optical fiber to compensate for the dispersion in the G652 standard optical fiber to ensure that the total dispersion of the entire optical fiber line is approximately zero. In other words, using this method, different lengths of dispersion compensation fibers must be added according to the different lengths of the G652 standard fiber. Therefore, the optical fiber deployment of the existing network must be modified, resulting in increased network deployment costs and link insertion loss.
  • Electrical domain dispersion compensation mainly uses equalization technology to increase the falling edge of the signal spectrum, amplify the signal in a specific frequency band, thereby broadening the receivable spectrum range, thereby compensating for the bandline filtering effect caused by dispersion, and thus improving the quality of the signal after dispersion. 3dB bandwidth value.
  • electrical domain dispersion compensation requires the use of an Optical Digital Signal Processor (ODSP) in the transceiver, which increases the cost compared to the commonly used clock data recovery (Clock Data Recovery, CDR) solution.
  • ODSP Optical Digital Signal Processor
  • CDR clock Data Recovery
  • the dispersion compensation function will increase the power consumption of the optical digital signal processor, resulting in an increase in the overall power consumption of the optical module.
  • this application provides an optical modulator, a transmitting device, a communication system and a modulation method to achieve dispersion compensation, thereby achieving high-speed, large-capacity, and long-distance communications.
  • FIG. 2 is a schematic structural diagram of an optical modulator in an embodiment of the present application.
  • the optical modulator 10 includes a beam splitter 11 , a first electro-optical phase shifter 12 , a second electro-optical phase shifter 13 and a combiner 14 , wherein the first electro-optical phase shifter 12 and the second electro-optical phase shifter
  • the detector 13 is arranged between the optical splitter 11 and the combiner 14.
  • the light modulator 10 can be fabricated on a chip, or can also be directly assembled in the light processing module.
  • the optical modulator 10 can be applied in long-distance transmission scenarios of wireless fronthaul, mid-backhaul, data center, access network or backbone network and other networks.
  • the optical modulator 10 can perform phase modulation on the input optical signal, thereby realizing pre-compensation of the optical signal.
  • the optical modulator 10 can be disposed on a transmitting device, so that the optical signal can be phase modulated and pre-compensated before the optical signal enters the optical fiber link. Therefore, even if the optical signal output by the optical modulator 10 occurs dispersion after long-distance transmission in the optical fiber link, the modulated optical signal received by the receiving device has been compensated for the dispersion and has better quality. Therefore, the optical modulator 10 of the present application can perform dispersion compensation on optical signals, thereby achieving high-speed, large-capacity, and long-distance communications.
  • Figure 3 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • the optical splitter 11 may include a signal input terminal 111 , a first output terminal 112 and a second output terminal 113 .
  • the signal input terminal 111 can be used as an input port of the optical modulator 10
  • the optical splitter 11 receives the optical signal through the signal input terminal 111 .
  • the optical splitter 11 is used to divide the optical signal into a first optical signal and a second optical signal, and output the first optical signal from the first output terminal 112 and the second optical signal from the second output terminal 113 .
  • the splitting ratio of the first output terminal 112 and the second output terminal 113 is assumed to be 1:m, and m>0 and m ⁇ 1. That is to say, the beam splitter 11 is a non-equal-proportion beam splitter.
  • the first optical signal and the second optical signal are not in equal proportions, after the first optical signal and the second optical signal are combined, the first optical signal The phase shift of the signal will not completely cancel out the phase shift of the second optical signal. Therefore, compared with the input optical signal, the final output optical signal will be superimposed with additional phase modulation, thereby achieving pre-compensation.
  • the pre-compensation described in the embodiments of this application occurs before the optical fiber link, that is to say, the optical signal has been modulated before dispersion occurs, such as phase modulation on the transmitting device side. Therefore, the optical signal output by the optical modulator 10 cannot reflect the effect of dispersion compensation before entering the optical fiber link. Only when the optical signal is dispersed in the optical fiber link, the optical signal received by the receiving device can reflect the pre-compensation effect of the optical modulator 10 on the optical signal.
  • the spectrometer 11 may be a multi-mode interferometer (Multi-mode Interferometer, MMI).
  • MMI Multi-mode Interferometer
  • the multi-mode interferometer divides the input optical signal into a first optical signal and a second optical signal according to a split ratio of 1:m, and outputs the first optical signal to the first electro-optical phase shifter 12 through the first output terminal 112, and through The second output terminal 113 outputs a second optical signal to the second electro-optical phase shifter 13 .
  • Figure 4 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • the optical splitter 11 can also be a coupler.
  • the optical splitter 11 may be a Y-type coupler.
  • Figure 5 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • the optical splitter 11 may also be a directional coupler.
  • the above-mentioned optical splitter 11 is not limited to these two types of couplers, and other types of couplers will not be described in detail in this application.
  • FIG 6 is another structural schematic diagram of an optical modulator in an embodiment of the present application.
  • the spectrometer 11 may be a Mach-Zehnder Interferometer (MZI).
  • MZI Mach-Zehnder Interferometer
  • the Mach-Zehnder interferometer can also perform low-speed phase shifting on the first optical signal and the second optical signal.
  • the specific number of optical splitters 11 is not limited, and may be 1, 2 or 4, for example.
  • light modulator 10 may package at least two Mach-Zehnder interferometers.
  • the above-mentioned at least two Mach-Zehnder interferometers can be connected in series, so that the splitting ratio of the first optical signal and the second optical signal finally output is 1:m.
  • these Mach-Zehnder interferometers can also be arranged in other ways, such as in a matrix distribution.
  • the above-mentioned Mach-Zehnder interferometer can also be set to be adjustable to achieve adjustment of the light splitting ratio.
  • the Mach-Zehnder interferometer may be thermally tuned.
  • the light modulator 10 may also include a heater provided corresponding to the Mach-Zehnder interferometer. The heater is used to heat the Mach-Zehnder interferometer. When the light modulator 10 is working, the heater can heat the Mach-Zehnder interferometer, so that the spectroscopic ratio of the Mach-Zehnder interferometer changes with changes in temperature, thereby changing the spectroscopic ratio of the Mach-Zehnder interferometer.
  • the Mach-Zehnder interferometer may also be electrically adjustable. By applying different voltages or currents to the Mach-Zehnder interferometer, the motion of carriers in the Mach-Zehnder interferometer can be changed, thereby changing the concentration of carriers. Since carriers of different concentrations have different refractive indexes, they refract light signals differently, so that the spectroscopic ratio of the Mach-Zehnder interferometer can be adjusted.
  • the electro-optical phase shifter is used to phase-modulate the optical signal.
  • the first electro-optical phase shifter 12 is connected to the first output terminal 112 of the optical splitter 11 , and the first optical signal is output from the first output terminal 112 and then enters the first electro-optical phase shifter 12 .
  • the first electro-optical phase shifter 12 may apply a first high-speed electrical signal to perform first phase modulation on the first optical signal.
  • the second electro-optical phase shifter 13 is connected to the second output terminal 113 of the spectrometer 11 , and the second optical signal is output from the second output terminal 113 and then enters the second electro-optical phase shifter 13 .
  • the second electro-optical phase shifter 13 may apply a second high-speed electrical signal, thereby performing second phase modulation on the second optical signal.
  • the first phase modulation and the second phase modulation may be the same or different. In practical applications, the first phase modulation and the second phase modulation can also be set according to factors such as the optical fiber link, transmission distance, etc., so that the quality of the optical signal received by the receiving device is better.
  • first electro-optical phase shifter 12 and second electro-optical phase shifter 13 can be arranged in parallel between the spectrometer 11 and the combiner 14, which can reduce the The size is beneficial to the miniaturization of the light modulator 10.
  • first electro-optical phase shifter 12 and the second electro-optical phase shifter 13 may not be arranged in parallel, and are not specifically limited in the embodiments of this application.
  • the combiner 14 includes a first input terminal 141 , a second input terminal 142 and a signal output terminal 143 .
  • the first optical signal is output from the first electro-optical phase shifter 12 and enters the combiner 14 from the first input terminal 141 .
  • the second optical signal is output from the second electro-optical phase shifter 13 and enters the combiner 14 from the second input terminal 142 .
  • the combiner 14 combines the modulated first optical signal and the second optical signal to obtain a modulated optical signal, and outputs the modulated optical signal from the signal output terminal 143 .
  • the type of the combiner 14 is not specifically limited.
  • it may be a coupler-based combiner, or it may be a multi-mode interferometer-based combiner, or it may also be a coupler-based combiner.
  • various types of optical splitters 11 can be paired with different types of combiners 14 without specific limitations.
  • the splitting ratio of the first input terminal 141 and the second input terminal 142 may be 1:n.
  • the electric field of the first optical signal is:
  • x(t) represents the composite signal.
  • x(t) represents the composite signal of the real signal s(t) and the DC bias b, that is:
  • A is the optical signal component output by the first output terminal 112 of the optical splitter 11
  • B is the optical signal component output by the second output terminal 113 of the optical splitter 11 .
  • a and B also satisfy:
  • the electric field after combining the first optical signal and the second optical signal is:
  • the optical signal is transmitted in a 10km long optical fiber link as an example.
  • the transfer function generated by the dispersion effect is h
  • the electric field of the optical signal received by the receiving device is:
  • the intensity of the optical signal received by the receiving device is:
  • FIG. 7 is a schematic structural diagram of a transmitting device in an embodiment of the present application.
  • the transmitting device 70 includes a housing 71 , a circuit board 72 and the light modulator 10 of the above embodiments.
  • the optical modulator 10 and the circuit board 72 are arranged in the housing 71 , and the optical modulator 10 is arranged on the circuit board 72 .
  • the optical splitter 11 divides the input optical signal into a first optical signal and a second optical signal, and the splitting ratio of the first optical signal and the second optical signal is 1:m, where m>0 and m ⁇ 1.
  • the first electro-optical phase shifter 12 performs first phase modulation on the first optical signal
  • the second electro-optical phase shifter 13 performs second phase modulation on the second optical signal. Since the first optical signal and the second optical signal are not in equal proportions, after the first optical signal and the second optical signal are combined, the phase offset of the first optical signal and the phase offset of the second optical signal will not completely cancel out. Therefore, compared with the input optical signal, the final output modulated optical signal will be superimposed with additional phase modulation, thereby achieving pre-compensation.
  • the modulation of the optical signal by the optical modulator 10 can compensate for the dispersion, so that the quality of the optical signal received by the receiving device is better.
  • FIG. 8 is a schematic structural diagram of a communication system in an embodiment of the present application.
  • the communication system 80 includes a transmitting device 70 , an optical fiber link 81 and a receiving device 82 .
  • the optical fiber link 81 connects the transmitting device 70 and the receiving device 82.
  • the modulated optical signal emitted by the transmitting device 70 will undergo dispersion after long-distance transmission in the optical fiber link 81, and the pre-compensation of the optical signal by the optical modulator 10 can compensate for the dispersion.
  • the quality of the optical signal received by the receiving device 82 is better, thereby achieving high-speed, large-capacity, and long-distance communication.
  • FIG. 9 is a schematic flowchart of the modulation method in the embodiment of the present application.
  • the optical modulator 10 of the above embodiment is used to perform the modulation method on the optical signal.
  • modulation methods include:
  • Step S901 The optical splitter receives the optical signal from the signal input end.
  • the signal input end 111 of the optical splitter 11 can be used as an input port of the optical modulator 10 , and the optical signal enters the optical splitter 11 from the signal input end 111 .
  • Step S902 The optical splitter divides the optical signal into a first optical signal and a second optical signal.
  • the splitting ratio of the first optical signal and the second optical signal is 1:m, where m>0 and m ⁇ 1.
  • the optical signal is divided into a first optical signal and a second optical signal, so that the first optical signal is subsequently input to the first electro-optical phase shifter 12, and the second optical signal is input to the second electro-optical phase shifter 12. 13 performs modulation respectively.
  • Step S903 The first electro-optical phase shifter performs first phase modulation on the first optical signal.
  • Step S904 The second electro-optical phase shifter performs second phase modulation on the second optical signal.
  • the phase modulations of the modulated first optical signal and the second optical signal will not completely cancel each other.
  • Step S905 The combiner performs multiplexing processing on the first optical signal modulated by the first phase and the second optical signal modulated by the second phase to obtain a modulated optical signal and output it.
  • the combined modulated optical signal is superimposed with additional phase modulation.
  • the modulated optical signal will undergo dispersion during the long-distance transmission of the optical fiber link 81, but the superimposed phase modulation can compensate for the dispersion, so that it can be transmitted in high-speed, large-capacity, and long-distance communications.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un modulateur optique, un appareil d'émission, un système de communication et un procédé de modulation. Le modulateur optique comprend un diviseur optique, un premier déphaseur électro-optique, un second déphaseur électro-optique et un combineur d'ondes, le diviseur optique étant utilisé pour diviser un signal optique en un premier signal optique et un second signal optique, et le rapport de division du premier signal optique au second signal optique étant de 1 : m, m étant supérieur à 0 et m n'étant pas égal à 1 ; le premier déphaseur électro-optique est connecté à une première extrémité de sortie et est utilisé pour effectuer une première modulation de phase sur le premier signal optique ; le second déphaseur électro-optique est connecté à une seconde extrémité de sortie et est utilisé pour effectuer une seconde modulation de phase sur le second signal optique ; et le combineur d'ondes est utilisé pour effectuer un traitement de combinaison d'ondes sur un premier signal optique modulé et un second signal optique modulé, de façon à obtenir un signal modulé et à le délivrer en sortie. Lorsque le modulateur optique est appliqué à un système de communication, même si un phénomène de dispersion se produit après qu'un signal optique entre dans une liaison de fibre optique et a été transmis sur une longue distance, la dispersion peut être compensée au moyen de la modulation et de la pré-compensation du modulateur optique pour le signal optique, de telle sorte qu'une communication à grande vitesse, à grande capacité et à longue distance est réalisée.
PCT/CN2022/082288 2022-03-22 2022-03-22 Modulateur optique, appareil d'émission, système de communication et procédé de modulation WO2023178517A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6650458B1 (en) * 2002-09-26 2003-11-18 Bookham Technology Plc Electro-optic modulator with continuously adjustable chirp
US10078232B1 (en) * 2014-07-11 2018-09-18 Acacia Communications, Inc. Advanced optical modulation generation by combining orthogonal polarized optical signals
CN110224758A (zh) * 2019-06-27 2019-09-10 云南德通科技有限公司 一种光信号调制系统及其传输系统
CN113721403A (zh) * 2020-05-25 2021-11-30 莫列斯有限公司 光调制装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6650458B1 (en) * 2002-09-26 2003-11-18 Bookham Technology Plc Electro-optic modulator with continuously adjustable chirp
US10078232B1 (en) * 2014-07-11 2018-09-18 Acacia Communications, Inc. Advanced optical modulation generation by combining orthogonal polarized optical signals
CN110224758A (zh) * 2019-06-27 2019-09-10 云南德通科技有限公司 一种光信号调制系统及其传输系统
CN113721403A (zh) * 2020-05-25 2021-11-30 莫列斯有限公司 光调制装置

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