CN109639352B - Intensity modulation direct detection system and method based on carrier support - Google Patents
Intensity modulation direct detection system and method based on carrier support Download PDFInfo
- Publication number
- CN109639352B CN109639352B CN201811625121.XA CN201811625121A CN109639352B CN 109639352 B CN109639352 B CN 109639352B CN 201811625121 A CN201811625121 A CN 201811625121A CN 109639352 B CN109639352 B CN 109639352B
- Authority
- CN
- China
- Prior art keywords
- signal
- phase noise
- pnc
- optical
- carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a system and a method for directly detecting intensity modulation based on carrier support, which relate to the field of direct detection optical communication and comprise the following steps: an optical signal transmitting device for transmitting an intensity-modulated optical signal based on a carrier support; and an optical signal receiving device for converting the intensity modulated optical signal into a digital signal r (n), converting the digital signal r (n) into a phase noise free signal r _ pnc (n), and demodulating the phase noise free signal into an original intensity signal. The intensity modulation direct detection system based on carrier support can reduce the implementation cost.
Description
Technical Field
The invention relates to the field of direct detection optical communication, in particular to an intensity modulation direct detection system and method based on carrier support.
Background
With the rapid increase of the mutual demand of information, the requirements of communication capacity and distance between a metropolitan area network and a data center are further improved, and the traditional direct alignment detection low-cost optical transmission cannot meet the communication demand. Although the conventional coherent detection technology can meet the requirements of capacity and distance, the number of users of the metropolitan area network is huge, and the high cost of coherent light transmission cannot be borne. Therefore, a direct detection technique based on a carrier support method has been widely studied in recent years. However, the conventional direct detection technology based on the carrier support method generally modulates the signal into a complex signal, and due to the frequency difference and the phase difference between the carrier and the signal light source, a narrow linewidth laser is required for signal recovery, which increases the implementation cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a carrier support-based intensity modulation direct detection system with low implementation cost.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a carrier support based intensity modulation direct detection system, comprising:
an optical signal transmitting device for transmitting an intensity-modulated optical signal based on a carrier support; and
and an optical signal receiving device for converting the intensity-modulated optical signal into a digital signal r (n), converting the digital signal r (n) into a phase-noise-free signal r _ pnc (n), and demodulating the phase-noise-free signal r _ pnc (n).
On the basis of the above technical solution, the optical signal transmitting apparatus includes:
a signal generator for generating an intensity signal for modulation;
a first laser for outputting a first optical carrier;
a Mach-Zehnder modulator (MZM) for receiving the intensity signal and modulating and outputting the first optical carrier as an optical signal;
a second laser for outputting a second optical carrier;
the polarization control unit comprises a first polarization controller and a second polarization controller, the first polarization controller is connected with the MZM, the second polarization controller is connected with the second laser, and the first polarization controller and the second polarization controller are used for enabling the optical signal and the second optical carrier to be in polarization consistency; and
and the coupler is connected with the first polarization controller and the second polarization controller and is used for synthesizing the optical signal with consistent polarization and the second optical carrier into an intensity modulation optical signal based on carrier support.
On the basis of the above technical solution, the optical signal receiving apparatus includes:
a photodetector for converting the intensity modulated optical signal into a received electrical signal;
an analog-to-digital converter for converting the received electrical signal into the digital signal r (n); and
and the digital signal processing module is used for converting the digital signal r (n) into a signal r _ pnc (n) without phase noise and demodulating the signal r _ pnc (n) without phase noise into an original intensity signal.
On the basis of the above technical solution, the digital signal processing module includes:
a signal self-beat frequency noise elimination unit for eliminating the self-beat frequency noise of the digital signal to obtain a processed signal
Wherein
sign (ω) is a sign function, which is 1 when ω > 0, 0 when ω ═ 0, and-1 when ω < 0;
a compensation unit, configured to perform dispersion and frequency offset compensation on the r _ ssbi (n) to obtain a signal r _ foc (n) with phase noise;
a phase noise compensation unit for converting the signal with phase noise into a signal r _ pnc (n) without phase noise; and
a demodulation unit for demodulating the phase noise free signal r _ pnc (n) into a raw strength signal.
On the basis of the above technical solution, the phase noise compensation unit includes:
a digital low-pass filter for filtering the signal with phase noise to obtain a modulated carrier signal c (n);
the amplifier is used for amplifying the carrier signal c (n) to obtain an amplified carrier signal k.c (n), wherein k is an amplification coefficient;
and a processing unit which obtains a phase noise free signal r _ pnc (n) according to a formula r _ pnc (n) ═ r _ foc (n) + k · c (n) | - | k · c (n) | based on the phase noise carrying signal and the amplified carrier signal.
The invention aims to provide a carrier support-based intensity modulation direct detection method with low implementation cost.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a carrier support-based intensity modulation direct detection method comprises the following steps:
transmitting an intensity-modulated optical signal based on a carrier support by using an optical signal transmitting apparatus;
the optical signal receiving device is used for converting the intensity modulation optical signal into a digital signal r (n), converting the digital signal r (n) into a signal r _ pnc (n) without phase noise, demodulating the signal r _ pnc (n) without phase noise and then detecting.
On the basis of the technical scheme, the optical signal transmitting device is used for transmitting the intensity modulation optical signal based on carrier wave support, and the specific steps are as follows:
a signal generator for generating an intensity signal for modulation;
the first laser outputs a first optical carrier;
the MZM receives the intensity signal and modulates and outputs the first optical carrier wave as an optical signal;
the second laser outputs a second optical carrier;
enabling the optical signal and the second optical carrier to be in polarization consistency by utilizing a first polarization controller and a second polarization controller in a polarization control unit; and
and synthesizing the optical signal with consistent polarization and the second optical carrier into an intensity modulation optical signal based on carrier support by using a coupler.
Based on the above technical solution, an optical signal receiving apparatus is used to convert the intensity-modulated optical signal into a digital signal r (n), convert the digital signal r (n) into a signal r _ pnc (n) without phase noise, and demodulate the signal r _ pnc (n) without phase noise into an original intensity signal, and the specific steps are as follows:
the photoelectric detector converts the intensity modulation optical signal into a receiving electric signal;
the analog-to-digital converter converts the received electric signal into the digital signal r (n);
and the digital signal processing module converts the digital signal into a signal r _ pnc (n) without phase noise and demodulates the signal r _ pnc (n) without phase noise into an original intensity signal.
On the basis of the technical scheme, a digital signal processing module converts the digital signal into a signal r _ pnc (n) without phase noise, and demodulates the signal r _ pnc (n) without phase noise into an original intensity signal, and the specific steps are as follows:
the signal self-timer frequency noise elimination unit eliminates the self-timer frequency noise of the digital signal r (n) to obtain a processed signal
Wherein
sign (ω) is a sign function, which is 1 when ω > 0, 0 when ω ═ 0, and-1 when ω < 0;
the compensation unit carries out dispersion and frequency offset compensation on the r _ ssbi (n) to obtain a signal r _ foc (n) with phase noise;
the phase noise compensation unit converts the signal r _ foc (n) into a signal r _ pnc (n) without phase noise; and
a demodulation unit for demodulating the phase noise free signal r _ pnc (n) into a raw strength signal.
On the basis of the above technical solution, the phase noise compensation unit converts the signal r _ foc (n) into a signal r _ pnc (n) without phase noise, and the specific steps are as follows:
filtering the signal with the phase noise by a digital low-pass filter to obtain a modulated carrier signal c (n);
the amplifier amplifies the carrier signal c (n) to obtain an amplified carrier signal k.c (n), wherein k is an amplification coefficient;
the processing unit obtains a phase noise free signal r _ pnc (n) according to the formula r _ pnc (n) ═ r _ foc (n) + k · c (n) | - | k · c (n) |.
Particular embodiments of the subject matter described in this specification can be implemented to realize one or more of the following advantages. After the carrier support-based intensity modulation direct detection system in this embodiment is adopted, a low-cost laser may be adopted at the transmitting end, that is, the first laser and the second laser may adopt Distributed FeedBack lasers (DFB), that is, the adopted laser has low requirements on line width, and the influence on the line width is eliminated by using a digital signal processing technology, so as to ensure the transmission performance of the system, and meanwhile, an IQ modulator is replaced by a mach-zehnder modulator, so that the system implementation cost is well reduced by using the low-cost laser and the mach-zehnder modulator.
The details of one or more embodiments of the subject matter described in this specification are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages of the subject matter will become apparent from the description, the drawings, and the claims.
Drawings
Fig. 1 is a block diagram of a structure block diagram of an intensity modulation direct detection system based on carrier support according to an embodiment of the present invention;
fig. 2 is a block diagram of a digital signal processing module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application.
In the present application, when a specific component is described as being located between a first component and a second component, there may or may not be intervening components between the specific component and the first component or the second component; when it is described that a specific component is connected to other components, the specific component may be directly connected to the other components without having an intervening component or may be directly connected to the other components with an intervening component.
Referring to fig. 1, fig. 1 is a block diagram of a carrier support-based intensity modulation direct detection system, which includes an optical signal transmitting apparatus and an optical signal receiving apparatus.
The optical signal transmitting device is used for transmitting an intensity modulation optical signal supported based on a carrier wave.
The optical signal receiving device is used for converting the intensity modulation optical signal into a digital signal r (n), converting the digital signal r (n) into a signal r _ pnc (n) without phase noise, and demodulating the signal r _ pnc (n) without phase noise.
As a preferred implementation manner, the optical signal transmitting apparatus in this embodiment specifically includes a signal generator, a first laser, a Mach-Zehnder Modulator (MZM), a second laser, a polarization control unit, and a coupler.
Wherein the signal generator is used for generating an intensity signal for modulation, and the first laser is used for outputting a first optical carrier.
The Mach-Zehnder modulator MZM is respectively connected with the signal generator and the first laser, and is used for receiving the intensity signal and modulating and outputting the first optical carrier as an optical signal.
The second laser is used for outputting a second optical carrier; the polarization control unit comprises a first polarization controller and a second polarization controller, the first polarization controller is connected with the MZM, the second polarization controller is connected with the second laser, and the first polarization controller and the second polarization controller are used for enabling the optical signal and the second optical carrier to be in polarization consistency.
The coupler is connected with the first polarization controller and the second polarization controller and is used for synthesizing the optical signal with consistent polarization and the second optical carrier into an intensity modulation optical signal based on carrier support.
Further, the optical signal receiving apparatus in this embodiment includes a photodetector, an analog-to-digital converter, and a digital signal processing module.
Wherein the photodetector is configured to convert the intensity modulated optical signal into a received electrical signal.
The analog-to-digital converter is used for converting the received electric signal into a digital signal.
The digital signal processing module is used for converting the digital signal r (n) into a signal r _ pnc (n) without phase noise and demodulating the signal r _ pnc (n) without phase noise into an original intensity signal. The original intensity signal refers to the intensity signal generated by the recovered signal generator.
Specifically, referring to fig. 2, the digital signal processing module includes a signal self-timer noise removing unit, a compensating unit, a phase noise compensating unit, and a demodulating unit.
The signal self-beat frequency noise elimination unit is used for eliminating the self-beat frequency noise of the digital signal to obtain a processed signal
Wherein
sign (ω) is a sign function, and is 1 when ω > 0, 0 when ω ═ 0, and-1 when ω < 0.
The compensation unit is used for carrying out dispersion and frequency offset compensation on r _ ssbi (n) to obtain a signal r _ foc (n) with phase noise.
The phase noise compensation unit is used for converting the signal with the phase noise into a signal r _ pnc (n) without the phase noise.
The demodulation unit is used for demodulating the signal r _ pnc (n) without phase noise into an original strength signal.
As a preferred implementation, the phase noise compensation unit in this embodiment includes a digital low-pass filter, an amplifier, and a processing unit.
The digital low-pass filter is used for filtering a signal with phase noise to obtain a modulated carrier signal c (n);
the amplifier is used for amplifying the carrier signal c (n) to obtain an amplified carrier signal k · c (n), wherein k is an amplification coefficient.
And a processing unit which obtains a phase noise free signal r _ pnc (n) according to the formula r _ pnc (n) ═ r _ foc (n) + k · c (n) | - | k · c (n) | based on the phase noise carrying signal and the amplified carrier signal.
After the carrier support-based intensity modulation direct detection system in this embodiment is adopted, a low-cost laser may be adopted at the transmitting end, that is, the first laser and the second laser may adopt distributed feedback lasers (DFB), that is, the adopted laser has low requirements on line width, and the influence on the line width is eliminated by a digital signal processing technology, so as to ensure the transmission performance of the system, and meanwhile, an IQ modulator is replaced by a mach-zehnder modulator, so that the system implementation cost is well reduced by the low-cost laser and the mach-zehnder modulator.
The embodiment also provides a carrier support-based intensity modulation direct detection method, which comprises the following steps:
s1, sending an intensity modulation optical signal based on carrier support by using an optical signal sending device;
specifically, an optical signal transmitting device is used for transmitting an intensity modulated optical signal supported by a carrier wave, and the method specifically comprises the following steps:
s11, a signal generator generates an intensity signal for modulation;
s12, outputting a first optical carrier by a first laser;
s13, MZM receives the intensity signal and modulates and outputs the first optical carrier as an optical signal;
s14, outputting a second optical carrier by a second laser;
s15, enabling the polarization of the optical signal to be consistent with that of the second optical carrier by utilizing a first polarization controller and a second polarization controller in a polarization control unit; and
and S16, synthesizing the optical signal with consistent polarization and the second optical carrier into an intensity modulation optical signal based on carrier support by using a coupler.
S2, converting the intensity modulation optical signal into a digital signal r (n) by using an optical signal receiving device, converting the digital signal r (n) into a signal r _ pnc (n) without phase noise, demodulating the signal r _ pnc (n) without phase noise, and then detecting.
Specifically, step S2 specifically includes the following steps:
s21, converting the intensity modulation optical signal into a receiving electrical signal by the photoelectric detector;
s22, converting the received electric signals into digital signals r (n) by an analog-to-digital converter;
s23, the digital signal processing module converts the digital signal into a signal r _ pnc (n) without phase noise, and then demodulates the signal r _ pnc (n) without phase noise into an original intensity signal.
As a preferred embodiment, step S23 specifically includes the following steps:
s231, the signal self-timer frequency noise elimination unit eliminates the self-timer frequency noise of the digital signal r (n) to obtain a processed signal
Wherein
sign (ω) is a sign function, which is 1 when ω > 0, 0 when ω ═ 0, and-1 when ω < 0;
s232, the compensation unit carries out dispersion and frequency offset compensation on r _ ssbi (n) to obtain a signal r _ foc (n) with phase noise;
s233, the phase noise compensation unit converts the signal r _ foc (n) into a signal r _ pnc (n) without phase noise;
s234, a demodulation unit for demodulating the phase noise free signal r _ pnc (n) into a raw strength signal.
As a preferred embodiment, step S233 specifically includes the following steps:
s2331, filtering a signal with phase noise by using a digital low-pass filter to obtain a modulated carrier signal c (n);
s2332, an amplifier amplifies a carrier signal c (n) to obtain an amplified carrier signal k · c (n), wherein k is an amplification coefficient;
s2333, the processing unit obtains the phase noise free signal r _ pnc (n) according to the formula r _ pnc (n) ═ r _ foc (n) + k · c (n) | - | k · c (n) |.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. A carrier-supported intensity modulation direct detection system, comprising:
an optical signal transmitting device for transmitting an intensity-modulated optical signal based on a carrier support; and
an optical signal receiving device for converting the intensity-modulated optical signal into a digital signal r (n), converting the digital signal r (n) into a phase-noise-free signal r _ pnc (n), and demodulating the phase-noise-free signal r _ pnc (n);
the optical signal transmitting apparatus includes:
a signal generator for generating an intensity signal for modulation;
a first laser for outputting a first optical carrier;
a Mach-Zehnder modulator (MZM) for receiving the intensity signal and modulating and outputting the first optical carrier as an optical signal;
a second laser for outputting a second optical carrier;
the polarization control unit comprises a first polarization controller and a second polarization controller, the first polarization controller is connected with the MZM, the second polarization controller is connected with the second laser, and the first polarization controller and the second polarization controller are used for enabling the optical signal and the second optical carrier to be in polarization consistency; and
the coupler is connected with the first polarization controller and the second polarization controller and is used for synthesizing the optical signal with consistent polarization and the second optical carrier into an intensity modulation optical signal based on carrier support;
the optical signal receiving apparatus includes:
a photodetector for converting the intensity modulated optical signal into a received electrical signal;
an analog-to-digital converter for converting the received electrical signal into the digital signal r (n); and
and the digital signal processing module is used for converting the digital signal r (n) into a signal r _ pnc (n) without phase noise and demodulating the signal r _ pnc (n) without phase noise into an original intensity signal.
2. The carrier supported intensity modulation direct detection system of claim 1, wherein the digital signal processing module comprises:
a signal self-beat frequency noise elimination unit for eliminating the self-beat frequency noise of the digital signal to obtain a processed signal
Wherein
sign (ω) is a sign function, which is 1 when ω > 0, 0 when ω ═ 0, and-1 when ω < 0;
a compensation unit, configured to perform dispersion and frequency offset compensation on the r _ ssbi (n) to obtain a signal r _ foc (n) with phase noise;
a phase noise compensation unit for converting the signal with phase noise into a signal r _ pnc (n) without phase noise; and
a demodulation unit for demodulating the phase noise free signal r _ pnc (n) into a raw strength signal.
3. The carrier supported intensity modulation direct detection system of claim 1 wherein the phase noise compensation unit comprises:
a digital low-pass filter for filtering the signal with phase noise to obtain a modulated carrier signal c (n);
the amplifier is used for amplifying the carrier signal c (n) to obtain an amplified carrier signal k.c (n), wherein k is an amplification coefficient;
and a processing unit which obtains a phase noise free signal r _ pnc (n) according to a formula r _ pnc (n) ═ r _ foc (n) + k · c (n) | - | k · c (n) | based on the phase noise carrying signal and the amplified carrier signal.
4. A method for directly detecting intensity modulation based on carrier support is characterized by comprising the following steps:
transmitting an intensity-modulated optical signal based on a carrier support by using an optical signal transmitting apparatus;
converting the intensity modulated optical signal into a digital signal r (n) by using an optical signal receiving device, converting the digital signal r (n) into a signal r _ pnc (n) without phase noise, demodulating the signal r _ pnc (n) without phase noise, and detecting the demodulated signal r _ pnc (n);
the method for transmitting the intensity modulation optical signal based on the carrier support by using the optical signal transmitting device comprises the following specific steps:
a signal generator for generating an intensity signal for modulation;
the first laser outputs a first optical carrier;
the MZM receives the intensity signal and modulates and outputs the first optical carrier wave as an optical signal;
the second laser outputs a second optical carrier;
enabling the optical signal and the second optical carrier to be in polarization consistency by utilizing a first polarization controller and a second polarization controller in a polarization control unit; and
synthesizing the optical signal with consistent polarization and a second optical carrier into an intensity modulation optical signal based on carrier support by using a coupler;
converting the intensity modulated optical signal into a digital signal r (n) by using an optical signal receiving device, converting the digital signal r (n) into a signal r _ pnc (n) without phase noise, and demodulating the signal r _ pnc (n) without phase noise into an original intensity signal, specifically comprising the following steps:
the photoelectric detector converts the intensity modulation optical signal into a receiving electric signal;
the analog-to-digital converter converts the received electric signal into the digital signal r (n);
and the digital signal processing module converts the digital signal into a signal r _ pnc (n) without phase noise and demodulates the signal r _ pnc (n) without phase noise into an original intensity signal.
5. The method according to claim 4, wherein the digital signal processing module converts the digital signal into a signal r _ pnc (n) without phase noise, and demodulates the signal r _ pnc (n) without phase noise into an original intensity signal, and comprises the following steps:
the signal self-timer frequency noise elimination unit eliminates the self-timer frequency noise of the digital signal r (n) to obtain a processed signal
Wherein
sign (ω) is a sign function, which is 1 when ω > 0, 0 when ω ═ 0, and-1 when ω < 0;
the compensation unit carries out dispersion and frequency offset compensation on the r _ ssbi (n) to obtain a signal r _ foc (n) with phase noise;
the phase noise compensation unit converts the signal r _ foc (n) into a signal r _ pnc (n) without phase noise; and
a demodulation unit for demodulating the phase noise free signal r _ pnc (n) into a raw strength signal.
6. The method as claimed in claim 5, wherein the phase noise compensation unit converts the signal r _ foc (n) into a signal r _ pnc (n) without phase noise by the following steps:
filtering the signal with the phase noise by a digital low-pass filter to obtain a modulated carrier signal c (n);
the amplifier amplifies the carrier signal c (n) to obtain an amplified carrier signal k.c (n), wherein k is an amplification coefficient;
the processing unit obtains a phase noise free signal r _ pnc (n) according to the formula r _ pnc (n) ═ r _ foc (n) + k · c (n) | - | k · c (n) |.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811625121.XA CN109639352B (en) | 2018-12-28 | 2018-12-28 | Intensity modulation direct detection system and method based on carrier support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811625121.XA CN109639352B (en) | 2018-12-28 | 2018-12-28 | Intensity modulation direct detection system and method based on carrier support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109639352A CN109639352A (en) | 2019-04-16 |
| CN109639352B true CN109639352B (en) | 2020-08-25 |
Family
ID=66078953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811625121.XA Active CN109639352B (en) | 2018-12-28 | 2018-12-28 | Intensity modulation direct detection system and method based on carrier support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109639352B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553560A (en) * | 2015-12-07 | 2016-05-04 | 武汉邮电科学研究院 | Polarization-independence direct detection system and method based on light intensity modulation signal |
| CN108768540A (en) * | 2018-05-25 | 2018-11-06 | 武汉邮电科学研究院有限公司 | Light signal receiving, method and the relevant optical transmission system with the device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA3038074C (en) * | 2016-09-27 | 2019-11-19 | Raytheon Company | Systems and methods for demodulation of free space optical signals without wavefront correction |
-
2018
- 2018-12-28 CN CN201811625121.XA patent/CN109639352B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553560A (en) * | 2015-12-07 | 2016-05-04 | 武汉邮电科学研究院 | Polarization-independence direct detection system and method based on light intensity modulation signal |
| CN108768540A (en) * | 2018-05-25 | 2018-11-06 | 武汉邮电科学研究院有限公司 | Light signal receiving, method and the relevant optical transmission system with the device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109639352A (en) | 2019-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108768540B (en) | Optical signal receiving device, method and coherent optical transmission system with the device | |
| US7330667B2 (en) | Electrical compensation of optical impairments | |
| Zhou et al. | Enabling technologies for high spectral-efficiency coherent optical communication networks | |
| CN108566250B (en) | Modulation and demodulation method and system based on carrier quadrature bias single sideband signal | |
| CN107634814B (en) | A kind of removing method of the carrier path crosstalk from homodyne detection mode division multiplexing system | |
| CN101771471B (en) | Method, device and system for multicarrier polarization multiplex transmission | |
| JP3072259B2 (en) | Low bias heterodyne optical fiber communication link | |
| JP6024169B2 (en) | Local optical communication system and method using coherent detection | |
| US20120121264A1 (en) | Apparatus and method for transmitting light, and apparatus and method for receiving light | |
| CN110350982B (en) | Self-coherent signal receiving and transmitting method and device | |
| CN103051375B (en) | Wireless laser communication heterodyne detection system and detection method thereof | |
| CN111130650B (en) | Method and device for generating intensity-modulated directly received optical signal and method and device for receiving intensity-modulated directly received optical signal | |
| US8538274B2 (en) | Optical relay system and method | |
| CN109639352B (en) | Intensity modulation direct detection system and method based on carrier support | |
| CN106877934B (en) | Carrier suppression mode radio-on-fiber vector wave system based on phase factor optimization | |
| EP3497825A1 (en) | Encoding for optical transmission | |
| WO2018171483A1 (en) | Coherent optical device | |
| CN111200464A (en) | SSB signal generation method based on alignment of signal and carrier phase of double MZM | |
| JP7164092B2 (en) | Polarization division multiplexed intensity modulation system and method of using same | |
| CN105871469A (en) | Realization method of 100-G CFP optical module | |
| JP5042054B2 (en) | All-optical regenerative repeater | |
| CN112653523B (en) | SSB signal generation method and device and intensity modulation direct detection system | |
| CN115459856B (en) | Direct alignment light detection communication system and method based on module multiplexing | |
| WO2023246089A1 (en) | Mobile fronthaul system and method, and storage medium | |
| Lowery et al. | Nanosecond-latency IM/DD/DSB to coherent/SSB converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |