CN113949455B - Optical communication device and optical communication system - Google Patents
Optical communication device and optical communication system Download PDFInfo
- Publication number
- CN113949455B CN113949455B CN202111087839.XA CN202111087839A CN113949455B CN 113949455 B CN113949455 B CN 113949455B CN 202111087839 A CN202111087839 A CN 202111087839A CN 113949455 B CN113949455 B CN 113949455B
- Authority
- CN
- China
- Prior art keywords
- optical
- signal
- output
- communication
- dispersion compensation
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
-
- 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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/2931—Signal power control using AGC
-
- 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
- H04B10/564—Power control
Abstract
The present disclosure relates to an optical communication apparatus and an optical communication system. The optical communication apparatus includes: the distance measurement module is used for determining the transmission distance between the sending end and the receiving end; the dispersion compensation module is used for carrying out dispersion compensation on the received communication signals when the received communication signals are first-class signals; the controller is used for determining the compensation amount of dispersion compensation based on the transmission distance when the communication signal is determined to be the first type signal; and the automatic power adjusting module adjusts the gain of the optical amplifier by taking the detected power information of each wavelength as a reference so as to realize the automatic power adjusting function. The first type of signal in this application may be an incoherent optical signal. When incoherent light transmission is carried out in a metropolitan area network, the dispersion compensation module can be automatically controlled by the controller to carry out dispersion compensation on the communication signals according to the dispersion compensation amount determined by the transmission distance, so that the dispersion compensation amount can be accurately controlled according to the transmission distance, the error rate can be effectively reduced, and the signal transmission quality can be improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an optical communication device and an optical communication system.
Background
In an optical communication system, when an optical signal is transmitted through an optical fiber, chromatic dispersion occurs, which affects the transmission quality of the optical signal. The optical fiber dispersion means that signals transmitted by an optical fiber are carried by different frequency components and different mode components, and the transmission speeds of the different frequency components and the different mode components are different, so that the signals are distorted. In digital fiber optic communication systems, dispersion causes optical pulses to spread. When the dispersion is serious, the front and the back of the optical pulse are mutually overlapped, so that intersymbol interference is caused, and the error rate is increased. The dispersion of the optical fiber not only affects the transmission capacity of the optical fiber but also limits the relay distance of the optical fiber communication system.
Disclosure of Invention
In view of the above, it is desirable to provide an optical communication apparatus and an optical communication system.
The technical scheme of the disclosure is realized as follows:
in one aspect, the present disclosure provides an optical communication device.
The optical communication device provided by the embodiment of the present disclosure includes:
the distance measurement module is used for determining the transmission distance between the home terminal and the opposite terminal;
the dispersion compensation module is at least used for carrying out dispersion compensation on the communication signals when the received communication signals are first-class signals;
the power adjusting module is used for detecting the power of each channel in the transmitting and receiving directions through the optical channel monitoring unit and amplifying the power of the communication signal through the optical amplifier, and the gain of the optical amplifier is adjusted by referring to the power of each channel detected by the optical channel monitoring unit;
and the controller is connected with the ranging module, the dispersion compensation module and the power adjusting module, and is used for automatically adjusting the power of the communication signal and determining the compensation amount of the dispersion compensation based on the transmission distance when the communication signal is determined to be the first type of signal.
In some embodiments, the dispersion compensation module comprises:
a first transmission path having a dispersion compensator thereon, the dispersion compensator being configured to perform dispersion compensation on the first type of signal transmitted through the first transmission path;
a second transmission path on which the dispersion compensator is not provided, the second transmission path being for passing a second type of signal different from the first type of signal.
In some embodiments, the dispersion compensation module comprises: a first optical switch, the dispersion compensator, and a second optical switch;
the first transmission path includes: from an input of the first optical switch, through a first output of the first optical switch, through an input of the dispersion compensator to an output of the dispersion compensator, through a first input of the second optical switch to an output of the second optical switch;
the second transmission path includes: from the input of the first optical switch, through the second output of the first optical switch, through the second input of the second optical switch, to the output of the second optical switch.
In some embodiments, the controller is connected to the first optical switch and the second optical switch, and configured to control the input terminal of the first optical switch to be conducted with a first output terminal and the first input terminal of the second optical switch to be conducted with an output terminal when the communication signal is determined to be the first type signal, where the first output terminal of the first optical switch is connected to the input terminal of the dispersion compensator, and the output terminal of the dispersion compensator is connected to the first input terminal of the second optical switch; or the like, or a combination thereof,
and when the communication signal is determined to be the second type signal, controlling the input end and the second output end of the first optical switch to be conducted, and controlling the second input end and the output end of the second optical switch to be conducted, wherein the second output end of the first optical switch is connected with the second input end of the second optical switch.
In some embodiments, the controller is specifically configured to determine a compensation amount for performing dispersion compensation on the communication signal according to the transmission distance and a dispersion compensation algorithm; and sending a dispersion compensation instruction to the dispersion compensator based on the compensation amount, wherein the dispersion compensation instruction is used for instructing the dispersion compensator to carry out dispersion compensation on the communication signal.
In some embodiments, the optical amplifier comprises at least:
and the first optical amplifier is connected with the dispersion compensation module and used for amplifying the optical power of the communication signal input in the receiving direction.
In some embodiments, further comprising:
the first coupler is connected with the output end of the first optical amplifier and is used for coupling the communication signal output by the first optical amplifier into a first split optical signal and a second split optical signal according to the determined first split optical ratio; the first optical signal is used for being output to an output port of the optical communication device, and the second optical signal is used for being output to an optical channel monitoring unit of the optical communication device.
In some embodiments, further comprising:
and the network management channel module is connected with the controller and used for sending the wavelength and power information of the communication signals in each channel to the controller.
In some embodiments, the optical amplifier further comprises:
the second optical amplifier is connected with the controller and used for carrying out optical power amplification on the communication signal in the sending direction according to a first control instruction sent by the controller; wherein the content of the first and second substances,
the controller is used for adjusting the gain of the second amplifier according to the power of each wavelength and the target power information detected by the optical channel monitoring unit and sending the first control instruction to the second amplifier.
In some embodiments, further comprising:
the second coupler is connected with the output end of the second optical amplifier and is used for coupling the communication signal output by the second optical amplifier into a third optical signal and a fourth optical signal according to the determined second splitting ratio; the third optical signal is used to output to the opposite terminal, and the fourth optical signal is used to output to an optical channel monitoring unit of the optical communication device.
In some embodiments, further comprising:
the variable attenuator is connected with the second coupler and the controller and is used for attenuating the optical power of the third optical splitting signal output by the coupler according to a second control instruction of the controller; wherein the controller is configured to determine an attenuated optical power of the third optical signal based on an optical power of the communication signal output by the second optical amplifier, an
And sending the second control instruction to the variable attenuator based on the attenuated optical power of the third optical signal.
In some embodiments, further comprising:
a first multiplexer component, an input end of which is connected to the input port of the sending direction and an output end of which is connected to an input end of a second optical amplifier, and configured to combine a plurality of optical signals with different wavelengths input by the input port into a first composite optical signal and output the first composite optical signal to the second optical amplifier;
and the input end of the first wavelength division component is connected with the first coupler, the output end of the first wavelength division component is connected with the output port in the receiving direction, and the first wavelength division component is used for splitting the first optical signal output by the first coupler into a plurality of single-wavelength optical signals with different wavelengths and outputting the plurality of single-wavelength optical signals to the output port.
In some embodiments, further comprising:
and the second wave-combining component at least comprises two input ends which are respectively connected with the output end of the variable attenuator and the network management channel module and used for combining the third optical signals output by the variable attenuator and the optical monitoring signals output by the network management channel module and outputting the combined communication signals to the opposite end.
In some embodiments, further comprising:
a second wavelength division component at least comprising an input terminal, a first output terminal, a second output terminal and a third output terminal,
the input end is connected to the opposite end, and is configured to receive a second composite optical signal that is sent by the opposite end and that at least includes the communication signal and the optical supervisory signal;
the first output end is connected with the network management channel module and used for outputting the optical monitoring signal obtained by splitting the second composite optical signal by the second wavelength division component to the network management channel module;
the second output end is connected to the first optical amplifier, and configured to output, to the first optical amplifier, the communication signal obtained by splitting the second composite optical signal by the second wavelength division component.
And the third output end is connected with the distance measuring module and used for outputting a distance measuring signal which is obtained by splitting the second wave splitting component and is reflected back from the opposite end to the distance measuring module, wherein the distance measuring signal is sent to the opposite end by the distance measuring module at the local end.
Optical supervisory signal
In another aspect, the present disclosure also provides an optical communication system, the system at least comprising:
the optical communication device as the home terminal according to the above embodiment.
The optical communication device of the embodiment of the disclosure comprises a distance measurement module, a dispersion compensation module, an optical power adjusting module and a controller. The distance measurement module determines the transmission distance of a receiving line through measurement; when the received communication signal is a first type signal, the dispersion compensation module carries out dispersion compensation on the communication signal; when the controller determines that the communication signal is the first type signal, the controller determines the compensation amount of dispersion compensation based on the transmission distance, and automatically controls the dispersion compensation module to perform dispersion compensation on the communication signal which is the first type signal based on the compensation amount. The first type of signal in this application may comprise an incoherent optical signal. In metropolitan networks for incoherent optical transmission, the communication signal can be severely dispersed. Therefore, the automatic dispersion compensation module is controlled by the controller based on the dispersion compensation amount determined by the transmission distance to carry out dispersion compensation on the communication signal, so that the dispersion compensation of the communication signal in the transmission distance can be realized, the dispersion compensation amount is accurately controlled, the effective reduction of the error rate is facilitated, the signal transmission quality is improved, the automatic power adjustment module monitors the current channel power according to the optical channel monitoring unit, determines the adjustment of the gain value of the amplifier according to the target power value of the channel and the current gain value of the amplifier, and realizes the automatic power adjustment function through the adjustment of the gain value of the amplifier.
Drawings
FIG. 1 is a schematic diagram of an optical communication device configuration shown in accordance with an exemplary embodiment;
fig. 2 is a schematic diagram illustrating a dispersion compensation module structure in an optical communication device according to an exemplary embodiment;
fig. 3 is a block diagram of a home optical communication device according to an example embodiment;
fig. 4 is a schematic diagram illustrating a peer optical communication device architecture according to an exemplary embodiment;
fig. 5 is a schematic diagram of an optical communication system configuration shown in accordance with an example embodiment.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the drawings and the specific embodiments of the specification. Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
In the optical communication metropolitan area system, high-speed and large-capacity transmission can be carried out by using coherent signals or non-coherent signals, the coherent signals do not need additional dispersion compensation on a receiving side, but the non-coherent signals need dispersion compensation. When an optical signal is transmitted in an optical fiber, chromatic dispersion occurs, and the transmission quality of the optical signal is affected. The optical fiber dispersion means that signals transmitted by an optical fiber are carried by different frequency components and different mode components, and the transmission speeds of the different frequency components and the different mode components are different, so that the signals are distorted. In digital fiber optic communication systems, dispersion causes optical pulses to spread. When the dispersion is serious, the front and the back of the optical pulse are mutually overlapped, so that intersymbol interference is caused, and the error rate is increased. The dispersion of the optical fiber not only affects the transmission capacity of the optical fiber, but also limits the relay distance of the optical fiber communication system.
Based on this, the present disclosure provides an optical communication apparatus. Fig. 1 is a schematic diagram illustrating an optical communication device structure according to an exemplary embodiment. As shown in fig. 1, the optical communication apparatus includes:
the distance measurement module 1 is used for determining the transmission distance between the home terminal and the opposite terminal;
the dispersion compensation module 3 is at least used for carrying out dispersion compensation on the communication signals when the received communication signals are first-class signals;
the power adjusting module 4 is used for detecting the power of each channel in the transmitting and receiving directions through the optical channel monitoring unit respectively, amplifying the power of the communication signal through the optical amplifier, and adjusting the gain of the optical amplifier by referring to the power of each channel detected by the optical channel monitoring unit;
and the controller 2 is connected with the ranging module, the dispersion compensation module and the power adjusting module, and is used for automatically adjusting the power of the communication signal and determining the compensation amount of the dispersion compensation based on the transmission distance when the communication signal is determined to be the first type of signal.
In the exemplary embodiment, the distance measuring module may be an OTDR (optical time-domain reflectometer), or other distance measuring module that can be used to measure the transmission distance of a signal in an optical fiber.
The optical time domain reflectometer is an instrument for knowing several properties of optical fiber, such as uniformity, defects, breakage, joint coupling and the like, through analyzing a measurement curve. The optical fiber attenuation measuring device is manufactured according to the backward scattering and Fresnel backward principle of light, obtains attenuation information by utilizing the backward scattering light generated when the light propagates in the optical fiber, can be used for measuring the attenuation of the optical fiber, the joint loss, the positioning of an optical fiber fault point, knowing the loss distribution condition of the optical fiber along the length and the like, and is an essential tool in the construction, maintenance and monitoring of the optical cable.
In this exemplary embodiment, the optical time domain reflectometer may send the ranging signal into an optical fiber for verification. The ranging signal is scattered and reflected back when encountering media with different refractive indexes. Since the intensity of the optical signal reflected from the transmitted ranging signal is measured and is a function of time, it can be converted to the length of the optical fiber. For example, d = (c × t)/2 (IOR), in this formula, c is the speed of light in vacuum, t is the total time from signal transmission to signal reception (two-way) (the distance of one-way after two values are multiplied by 2), and d is the length of the optical fiber between the transmitting end and the receiving end, i.e. the transmission distance of the communication signal in the optical fiber. Because light is slower in glass than in vacuum, the fiber under test must be index of refraction (IOR) in order to accurately measure distance. IOR is designated by the fiber manufacturer.
In the present exemplary embodiment, the communication signal may include a first type signal and a second type signal. The first type of signal may be a non-coherent signal and the second type of signal may be a coherent signal. High-order modulated coherent signals are mainly used for long-distance transmission of thousands of kilometers because of their small dispersion. However, the modulation cost of the high-order modulated coherent signal is relatively high, and when the high-order modulated coherent signal is used for short-distance transmission of dozens of kilometers in a metropolitan area network, the unit transmission cost is obviously too high. It is therefore conceivable to use incoherent signals for short-range transmissions of several tens of kilometers in metropolitan networks. However, the dispersion of the incoherent signal is relatively severe, so that the optical communication device in the present application can be used for dispersion compensation of the incoherent signal.
In this exemplary embodiment, when the communication signal is a first type signal, that is, a non-coherent signal, the controller may determine a compensation amount of the dispersion compensation according to the transmission distance determined by the ranging module. The compensation quantity of the dispersion compensation is determined according to the transmission distance determined by the distance measuring module, and the compensation quantity comprises the following steps: determining the type of the optical fiber and the wavelength range of the communication signal, and determining the dispersion amount of the communication signal when the unit length of optical fiber is transmitted based on the type of the optical fiber and the wavelength of the communication signal; the compensation amount for the dispersion compensation is determined based on the dispersion amount of the communication signal when transmitted over a unit length of optical fiber and the transmission distance. Wherein different types of optical fibers have different dispersion levels for the same communication signal. The dispersion degree of optical signals with different wavelengths in the same optical fiber is also different.
In the exemplary embodiment, the power adjusting module has an optical channel monitoring unit therein to detect the communication signal power of each channel.
The optical communication device of the embodiment of the present disclosure includes a ranging module, a dispersion compensation module, a power automatic adjustment module, and a controller. The distance measurement module determines the transmission distance between the home terminal and the opposite terminal through measurement; when the received communication signal is a first type signal, the dispersion compensation module carries out dispersion compensation on the communication signal; when the controller determines that the communication signal is the first type signal, the controller determines the compensation amount of dispersion compensation based on the transmission distance, and automatically controls the dispersion compensation module to perform dispersion compensation on the communication signal which is the first type signal based on the compensation amount. The first type of signal in this application may comprise an incoherent optical signal. In the case of incoherent optical transmission in metropolitan networks, the communication signals are severely dispersed. Therefore, the dispersion compensation module is automatically controlled by the controller based on the dispersion compensation amount determined by the transmission distance to carry out dispersion compensation on the communication signal, so that the dispersion compensation of the communication signal in the transmission distance can be realized, the dispersion compensation amount can be accurately controlled, the bit error rate can be effectively reduced, and the signal transmission quality can be improved.
In some embodiments, the dispersion compensation module comprises:
a first transmission path having a dispersion compensator thereon, the dispersion compensator being configured to perform dispersion compensation on the first type of signal transmitted through the first transmission path;
a second transmission path not having the dispersion compensator thereon, the second transmission path being for passing a second type of signal different from the first type of signal.
In the present exemplary embodiment, in order to be compatible with communication transmission of coherent signals and incoherent signals, the dispersion compensation module may have a first transmission path and a second transmission path. The first transmission path has a dispersion compensator for dispersion compensating the incoherent signal. Coherent signals can be transmitted through a path without a dispersion compensator, so that the communication output of the second type of signals can be facilitated while the dispersion compensation processing of the first type of signals can be realized through the selection of the transmission path.
In the exemplary embodiment, when the dispersion compensator performs dispersion compensation on the incoherent signal, if the communication signal is a composite optical signal including a plurality of single wavelengths, the dispersion compensation slopes corresponding to the wavelengths can be set in the dispersion compensator according to the dispersion difference of the wavelengths in the optical fiber. And after determining the compensation amount of the total dispersion compensation, the controller performs dispersion compensation on the optical signals with different wavelengths according to the dispersion compensation slopes. For example, if the total dispersion compensation amount is M and the dispersion compensation slope of the a-wavelength light is a, the total dispersion compensation amount is M × a.
In some embodiments, the dispersion compensation module comprises: a first optical switch, the dispersion compensator, and a second optical switch;
the first transmission path includes: from the input of the first optical switch, through the first output of the first optical switch, through the input of the dispersion compensator to the output of the dispersion compensator, through the first input of the second optical switch to the output of the second optical switch;
the second transmission path includes: from the input of the first optical switch, through the second output of the first optical switch, through the second input of the second optical switch, to the output of the second optical switch.
In the present exemplary embodiment, fig. 2 is a schematic diagram illustrating a structure of a dispersion compensation module in an optical communication device according to an exemplary embodiment. As shown in fig. 2, the first transmission path and the second transmission path may be implemented by a first optical switch, a dispersion compensator, and a second optical switch. Wherein the first optical switch may comprise an input, a first output 21 and a second output 22 and the second optical switch may comprise a first input 23, a second input 24 and an output.
A first transmission path is formed from the input end of the first optical switch, the first output end of the first optical switch, the input end of the dispersion compensator to the output end of the dispersion compensator, and the first input end of the second optical switch to the output end of the second optical switch;
a second transmission path is formed from the input end of the first optical switch to the output end of the second optical switch through the second output end of the first optical switch and the second input end of the second optical switch; wherein the output of the second optical switch is connectable to an output port of the optical communication device.
In some embodiments, the controller is connected to the first optical switch and the second optical switch, and configured to control the input terminal of the first optical switch to be conducted to the first output terminal and the first input terminal of the second optical switch to be conducted to the output terminal when the communication signal is determined to be the first type signal, wherein the first output terminal of the first optical switch is connected to the input terminal of the dispersion compensator, and the output terminal of the dispersion compensator is connected to the first input terminal of the second optical switch; or the like, or, alternatively,
and when the communication signal is determined to be the second type of signal, controlling the input end of the first optical switch to be conducted with the second output end, and controlling the second input end of the second optical switch to be conducted with the output end, wherein the second output end of the first optical switch is connected with the second input end of the second optical switch.
Fig. 3 is a schematic diagram illustrating a structure of a local optical communication device according to an exemplary embodiment. As shown in fig. 3, the optical communication device as the home terminal includes a controller, a ranging module (OTDR), and a dispersion compensation module (including an optical switch 1, a dispersion compensator, and an optical switch 2, where the optical switch 1 is a first optical switch, and the optical switch 2 is a second optical switch); the controller is connected to the optical switch 1 (first optical switch), the dispersion compensator, and the optical switch 2 (second optical switch).
In some embodiments, the controller is specifically configured to determine a compensation amount for performing dispersion compensation on the communication signal according to the transmission distance and a dispersion compensation algorithm;
and sending a dispersion compensation instruction to the dispersion compensator based on the compensation amount, wherein the dispersion compensation instruction is used for instructing the dispersion compensator to carry out dispersion compensation on the communication signal.
In the present exemplary embodiment, the dispersion compensation algorithm is used to determine the amount of dispersion of the communication signal per unit length of optical fiber upon transmission based on the type of optical fiber and the wavelength of the communication signal; the compensation amount for the dispersion compensation is determined based on the dispersion amount of the communication signal when transmitted over a unit length of optical fiber and the transmission distance.
In the present exemplary embodiment, the dispersion compensation command contains at least the total compensation amount for dispersion compensation, and/or the transmission distance. The dispersion compensator can carry out dispersion compensation on the communication signal according to the received total compensation amount, and can also carry out dispersion compensation on each wavelength according to the transmission distance respectively according to the preset compensation slope and dispersion compensation algorithm.
In some embodiments, the optical amplifier comprises at least:
and the first optical amplifier is connected with the dispersion compensation module and used for amplifying the optical power of the communication signal input in the receiving direction.
In the present exemplary embodiment, as shown in fig. 3, the optical communication device further includes a first amplifier, i.e., the optical amplifier 1 in fig. 3; the first optical amplifier may be an optical amplifier having an intermediate stage function, and is connected to a dispersion compensation module, which is disposed at the intermediate stage of the first amplifier.
In some embodiments, further comprising:
a first coupler, i.e. the coupler 1 shown in fig. 3, connected to the output end of the first optical amplifier, and configured to couple the communication signal output by the first optical amplifier into a first split optical signal and a second split optical signal according to a determined first splitting ratio; the first optical signal is used for being output to an output port of the optical communication device, and the second optical signal is used for being output to an optical channel monitoring unit of the optical communication device.
In the present exemplary embodiment, as shown in fig. 3, an optical channel monitoring unit is further included in the optical communication device. The Optical Channel monitoring unit may be an OCM (Optical Channel Monitor) configured to Monitor a wavelength of the communication signal output after the Optical power amplification of the Optical amplifier and an Optical power of each Channel in real time, and provide a data reference for adjusting the Optical power of the communication signal. In the present exemplary embodiment, the first light splitting ratio may be an arbitrary ratio. A first optical splitting signal with a larger proportion is output to an input port of the wavelength division component 1; and outputting the second split optical signal with a smaller proportion to an optical channel monitoring unit.
In this exemplary embodiment, as shown in fig. 3, the optical communication device further includes a network management channel module. The network management Channel module may be an OSC (Optical Supervisory Channel). The network management channel is mainly used for monitoring the transmission condition of each channel in the system, including the power attenuation condition, dispersion condition and the like of communication signals in the channel, optical monitoring signals with the wavelength of A (for example, 1510 nm) generated by the node are inserted into the local terminal, and the optical monitoring signals and the optical signals of the main channel are multiplexed and output; in the receiving direction, the optical supervisory signals sent from the opposite end are separated from the received optical signals.
In some embodiments, the optical communication device further comprises:
the second optical amplifier, i.e. the optical amplifier 2 shown in fig. 3, is connected to the controller,
the optical power amplifier is used for amplifying the optical power of the communication signal in the sending direction according to a first control instruction sent by the controller; wherein the content of the first and second substances,
the controller is used for adjusting the gain of the second amplifier according to the power of each wavelength and the target power information detected by the optical channel monitoring unit and sending the first control instruction to the second amplifier.
In the present exemplary embodiment, in addition to sending the communication signal, the optical monitoring signal of the local end is also sent to the opposite end. And the received communication signal is input by the input port and then is subjected to optical power amplification through the second optical amplifier. Specifically, the controller determines a gain value to be adjusted by the second amplifier according to the current power information and the target power information of each channel and the current gain of the second amplifier, which are tested by the optical channel monitoring unit, and instructs the second optical amplifier to perform power amplification on the communication signal by sending a first control instruction.
In the present exemplary embodiment, the target power information at least includes optical power related information that the communication signal needs to have when being transmitted to the opposite end, for example, an optical power value that the communication signal needs to have when being transmitted to the opposite end, and the like.
In some embodiments, the optical communication device further comprises:
the second coupler may be the coupler 2 shown in fig. 3, and is connected to the output end of the second optical amplifier, and configured to couple the communication signal output by the second optical amplifier into a third optical signal and a fourth optical signal according to a determined second splitting ratio; the third optical signal splitter is configured to output the third optical signal to the opposite end, and the fourth optical signal splitter is configured to output the fourth optical signal to an optical channel monitoring unit of the optical communication device.
In the present exemplary embodiment, when the communication signal is transmitted in the transmission direction, data such as optical power of the communication signal also needs to be monitored in real time, and therefore, the communication signal can be coupled into the third optical signal and the fourth optical signal according to the second splitting ratio by the second coupler; outputting a larger proportion of the third optical signal to the third optical signal; the fourth light signal with a smaller proportion is output to the optical channel monitoring unit to monitor data such as optical power of the communication signal in real time, and provide data reference for adjustment of the optical power of the communication signal.
In some embodiments, the optical communication device further comprises:
the variable attenuator shown in fig. 3 is connected to the second coupler and the controller, and is configured to attenuate the optical power of the third optical signal output by the coupler according to a second control instruction of the controller; wherein the controller is configured to determine an attenuated optical power of the third optical signal based on an optical power of the second optical amplifier output communication signal, an
And sending the second control instruction to the variable attenuator based on the attenuation optical power of the third optical signal.
In the exemplary embodiment, in order to ensure accurate attenuation of the optical power of the communication signal transmitted to the receiving end, a variable attenuator may be connected after the second coupler to achieve further attenuation of the optical power of the communication signal.
Determining an attenuated optical power of the third optical signal based on an optical power of the second optical amplifier output communication signal, comprising:
if the optical power of the communication signal output by the second optical amplifier is greater than the optical power theoretically required to be output, the optical power of the communication signal is attenuated by the variable attenuator, so that the optical power output by the variable attenuator is equal to the optical power theoretically required to be output, and the accurate adjustment of the optical power of the communication signal is realized.
In this exemplary embodiment, the variable attenuator may further adjust the variable attenuator of the local end according to the power of the communication signal received by the first optical amplifier of the opposite end, which is sent by the network management channel module of the opposite end. In some embodiments, the optical communication device further comprises:
a first multiplexing component, that is, a component having a multiplexing function 1 shown in fig. 3, an input end of the first multiplexing component is connected to the input port in the transmission direction, and an output end of the first multiplexing component is connected to an input end of a second optical amplifier, and is configured to multiplex a plurality of optical signals with different wavelengths input by the input port into a first composite optical signal and output the first composite optical signal to the second optical amplifier;
the first wavelength division component, that is, the component with the wavelength division function 1 shown in fig. 3, has an input end connected to the first coupler and an output end connected to the output port in the receiving direction, and is configured to split the first optical signal output by the first coupler into a plurality of single-wavelength optical signals with different wavelengths and output the plurality of single-wavelength optical signals to the output port.
In the present exemplary embodiment, the optical communication device may further include a first multiplexing component, configured to combine the optical signals with the multiple different wavelengths (i.e., λ 1 to λ n shown in fig. 3) into a first composite optical signal and output the first composite optical signal to the second optical amplifier; the first demultiplexing component is configured to demultiplex the first demultiplexed optical signal output by the first coupler into a plurality of single-wavelength optical signals (i.e., λ 1 to λ n shown in fig. 3) with different wavelengths and output the single-wavelength optical signals to an output port of the optical communication device, so that multi-wavelength multiplexing can be performed in a sending direction, and the received composite optical signal is analyzed into a plurality of single-wavelength signals, so as to perform signal analysis.
In some embodiments, the optical communication device further comprises:
the second wave-combining component, that is, the component with the wave-combining function 2 shown in fig. 3, at least includes two input ends, which are respectively connected to the output end of the variable attenuator and the network management channel module, and is configured to combine the third optical signal output by the variable attenuator and the optical monitoring signal output by the network management channel module, and output the combined communication signal to an optical fiber line for transmission. In this exemplary embodiment, the optical communication device further includes a second wave-combining component, configured to combine the composite optical signal output by the variable attenuator with the optical monitoring signal output by the network management channel module, and output the combined communication signal to the line side for transmission, so as to implement multiple signal transmission in the same optical fiber.
In some embodiments, the optical communication device further comprises:
the second wavelength-division component is the component with the wavelength-division function 2 shown in figure 3,
at least comprises an input end, a first output end, a second output end and a third output end,
the input end is connected to the opposite end, and is configured to receive a second composite optical signal that is sent by the opposite end and that at least includes the communication signal and the optical supervisory signal;
the first output end is connected with the network management channel module and used for outputting the optical monitoring signal obtained by splitting the second composite optical signal by the second wavelength division component to the network management channel module;
the second output end is connected to the first optical amplifier, and is configured to output the communication signal obtained by splitting the second composite optical signal by the second wavelength division component to the first optical amplifier.
And the third output end is connected with the ranging module and used for outputting a ranging signal obtained by splitting the second wave splitting component and reflected back from the opposite end to the ranging module, wherein the ranging signal is a network management signal sent by the ranging module at the local end to the opposite end.
In this exemplary embodiment, the optical communication device further includes a second demultiplexing component, configured to demultiplex a communication signal and an optical monitoring signal sent by an opposite end from the second composite optical signal, and send the demultiplexed communication signal to the first optical amplifier for optical power amplification; the output optical monitoring signal is output to the network management channel module for processing the optical monitoring signal. And the third output end of the second wave-splitting component is connected with the ranging module and used for sending the ranging signal to the line for ranging by the ranging module.
In another aspect, the present disclosure also provides an optical communication system, the system at least comprising:
the optical communication device as the home terminal according to the above embodiment.
In this exemplary embodiment, the optical communication system may further include another optical communication device that is the same as the local terminal as the opposite terminal, in addition to the optical communication device that is the local terminal. Fig. 4 is a schematic structural diagram of a peer optical communication device according to an exemplary embodiment. As shown in fig. 4, the optical communication device at the opposite end includes a corresponding device in the optical communication device at the home end. The optical communication equipment of the local terminal and the optical communication equipment of the opposite terminal can be respectively distributed in two different cities or places to realize remote communication. Fig. 5 is a schematic diagram of an optical communication system configuration shown in accordance with an example embodiment. As shown in fig. 5, the optical communication system includes a home terminal and an opposite terminal that can be distributed at two different locations for opposite-terminal communication respectively.
In an optical communication system, with the maturity of a high-order modulation coherent receiving technology, currently, both 100G and over 100G long-distance transmission systems are basically the high-order modulation coherent receiving transmission technology. The high-order modulation coherent receiving technology has the characteristics of high spectrum utilization, large transmission capacity and suitability for long-distance transmission, and benefits from a powerful digital signal processing chip (DSP), the dispersion in the current transmission can be compensated in an electrical domain by using a coherent algorithm, for example, the dispersion tolerance can reach 100ns/nm for 100G QPSK as an example, and the dispersion tolerance of a 1550nm window of a G.652 optical fiber is 17ps/nm, so that the dispersion tolerance of 100ns/nm is equivalent to the capability of transmitting 5882km without additional dispersion compensation. Although there are many advantages to the high-order modulation coherent reception technique, the cost is relatively expensive, and the cost is acceptable for long distance transmission of hundreds of kilometers, but the cost is relatively high for coherent transmission within 80 km.
Schemes for incoherent transmission are constantly being explored for transmission over tens of kilometres, for example for incoherent transmission within 80km, PAM 4-based transmission has now emerged. For a transmission signal of 100G, 2 wavelengths are used, each wavelength being transmitted by coding and decoding with PAM 4. Thus, in a C-band 96-wave system, a 4.8T transmission capacity can be realized. Such a transmission capacity is also suitable for situations where the traffic volume is not particularly large. However, PAM4 signal transmission with double wavelength for 100G has smaller dispersion tolerance (+ -100 ps/nm), the dispersion for 1550nm window of G.652 optical fiber is 17ps/nm, and the dispersion tolerance for 100ps/nm is equivalent to that 5.882km can be transmitted without additional dispersion compensation. For transmission over tens of kilometres in urban applications, dispersion compensation must be required over the link.
The optical communication equipment can be applied to the transmission of incoherent light for dozens of kilometers, can save cost compared with coherent light transmission, can reduce optical dispersion, and ensures the transmission quality of optical signals.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or in other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
In some cases, any two technical features described above may be combined into a new method solution without conflict.
In some cases, any two of the above technical features may be combined into a new device solution without conflict.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media capable of storing program codes, such as a removable Memory device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (15)
1. An optical communication device, characterized in that the optical communication device comprises:
the distance measurement module is used for determining the transmission distance between the home terminal and the opposite terminal;
the dispersion compensation module comprises a dispersion compensator and a dispersion compensation module, wherein the dispersion compensator is at least used for carrying out dispersion compensation on the communication signals when the received communication signals are first-class signals; wherein the first type of signal is a non-coherent signal;
the power adjusting module is used for detecting the power of each channel in the transmitting and receiving directions through the optical channel monitoring unit and amplifying the power of the communication signal through the optical amplifier, and the gain of the optical amplifier is adjusted by referring to the power of each channel detected by the optical channel monitoring unit;
the controller is connected with the ranging module, the dispersion compensation module and the power adjusting module, and is used for automatically adjusting the power of the communication signal and determining the compensation amount for performing dispersion compensation on the communication signal based on the transmission distance and a dispersion compensation algorithm when the communication signal is determined to be the first type of signal; and sending a dispersion compensation instruction to the dispersion compensator based on the compensation amount, wherein the dispersion compensation instruction is used for instructing the dispersion compensator to carry out dispersion compensation on the communication signal.
2. The optical communication apparatus of claim 1, wherein the dispersion compensation module comprises:
a first transmission path having a dispersion compensator thereon, the dispersion compensator being configured to perform dispersion compensation on the first type of signal transmitted through the first transmission path;
a second transmission path on which the dispersion compensator is not provided, the second transmission path being for passing a second type of signal different from the first type of signal.
3. The optical communication apparatus of claim 2, wherein the dispersion compensation module comprises: a first optical switch, the dispersion compensator, and a second optical switch;
the first transmission path includes: from an input of the first optical switch, through a first output of the first optical switch, through an input of the dispersion compensator to an output of the dispersion compensator, through a first input of the second optical switch to an output of the second optical switch;
the second transmission path includes: from the input of the first optical switch, through the second output of the first optical switch, through the second input of the second optical switch, to the output of the second optical switch.
4. The optical communication device of claim 3,
the controller is connected to the first optical switch and the second optical switch, and configured to control an input end of the first optical switch to be electrically connected to a first output end of the first optical switch, and a first input end of the second optical switch to be electrically connected to an output end of the second optical switch, where the first output end of the first optical switch is connected to an input end of the dispersion compensator, and the output end of the dispersion compensator is connected to the first input end of the second optical switch; or the like, or a combination thereof,
and when the communication signal is determined to be the second type of signal, controlling the input end of the first optical switch to be conducted with the second output end, and controlling the second input end of the second optical switch to be conducted with the output end, wherein the second output end of the first optical switch is connected with the second input end of the second optical switch.
5. The optical communication device according to claim 3, wherein the controller is specifically configured to determine a compensation amount for performing dispersion compensation on the communication signal according to the transmission distance and a dispersion compensation algorithm; the method comprises the following steps: determining the type of the optical fiber and the wavelength range of the communication signal, and determining the dispersion amount of the communication signal when the unit length of optical fiber is transmitted based on the type of the optical fiber and the wavelength of the communication signal; the compensation amount for the dispersion compensation is determined based on the dispersion amount of the communication signal when transmitted over a unit length of optical fiber and the transmission distance.
6. The optical communication device of claim 1, wherein the optical amplifier comprises at least:
and the first optical amplifier is connected with the dispersion compensation module and is used for amplifying the optical power of the communication signal input in the receiving direction.
7. The optical communication device of claim 6, further comprising:
the first coupler is connected with the output end of the first optical amplifier and is used for coupling the communication signal output by the first optical amplifier into a first split optical signal and a second split optical signal according to the determined first split optical ratio; the first optical signal is used for being output to an output port of the optical communication device, and the second optical signal is used for being output to an optical channel monitoring unit of the optical communication device.
8. The optical communication device of claim 6, further comprising:
and the network management channel module is connected with the controller and used for sending the wavelength and power information of the communication signals in each channel to the controller.
9. The optical communication device of claim 7, wherein the optical amplifier further comprises:
the second optical amplifier is connected with the controller and used for carrying out optical power amplification on the communication signal in the sending direction according to a first control instruction sent by the controller; wherein the content of the first and second substances,
and the controller is used for adjusting the gain of the second amplifier according to the power of each wavelength and the target power information detected by the optical channel monitoring unit and sending the first control instruction to the second amplifier.
10. The optical communication device of claim 9, further comprising:
the second coupler is connected with the output end of the second optical amplifier and is used for coupling the communication signal output by the second optical amplifier into a third optical signal and a fourth optical signal according to the determined second splitting ratio; the third optical signal splitter is configured to output the third optical signal to the opposite end, and the fourth optical signal splitter is configured to output the fourth optical signal to an optical channel monitoring unit of the optical communication device.
11. The optical communication device of claim 10, further comprising:
the variable attenuator is connected with the second coupler and the controller and is used for attenuating the optical power of the third optical splitting signal output by the coupler according to a second control instruction of the controller; wherein the controller is configured to determine an attenuated optical power of the third optical signal based on an optical power of the second optical amplifier output communication signal, an
And sending the second control instruction to the variable attenuator based on the attenuated optical power of the third optical signal.
12. The optical communication device of claim 11, further comprising:
a first multiplexer component, an input end of which is connected to the input port of the sending direction and an output end of which is connected to an input end of a second optical amplifier, and configured to combine a plurality of optical signals with different wavelengths input by the input port into a first composite optical signal and output the first composite optical signal to the second optical amplifier;
and the input end of the first wavelength division component is connected with the first coupler, the output end of the first wavelength division component is connected with the output port in the receiving direction, and the first wavelength division component is used for splitting a first light division signal output by the first coupler into a plurality of single-wavelength light signals with different wavelengths and outputting the plurality of single-wavelength light signals to the output port.
13. The optical communication device of claim 8, further comprising:
and the second wave combining component at least comprises two input ends which are respectively connected with the output end of the variable attenuator and the network management channel module and used for combining the third optical splitting signal output by the variable attenuator and the optical monitoring signal output by the network management channel module and outputting the combined communication signal to the opposite end.
14. The optical communication device of claim 8, further comprising:
a second wavelength-division component at least comprising an input end, a first output end, a second output end and a third output end,
the input end is connected with the opposite end and is used for receiving a second composite optical signal which is sent by the opposite end and at least comprises the communication signal and the network management signal;
the first output end is connected with the network management channel module and used for outputting the optical monitoring signal obtained by splitting the second composite optical signal by the second wave splitting component to the network management channel module;
the second output end is connected to the first optical amplifier, and configured to output the communication signal obtained by splitting the second composite optical signal by the second wavelength division component to the first optical amplifier;
and the third output end is connected with the distance measuring module and used for outputting a distance measuring signal which is obtained by splitting the second wave splitting component and is reflected back from the opposite end to the distance measuring module, wherein the distance measuring signal is sent to the opposite end by the distance measuring module at the local end.
15. An optical communication system, characterized in that the system comprises at least:
the optical communication device of any one of claims 1-14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111087839.XA CN113949455B (en) | 2021-09-16 | 2021-09-16 | Optical communication device and optical communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111087839.XA CN113949455B (en) | 2021-09-16 | 2021-09-16 | Optical communication device and optical communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113949455A CN113949455A (en) | 2022-01-18 |
| CN113949455B true CN113949455B (en) | 2023-02-14 |
Family
ID=79328699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111087839.XA Active CN113949455B (en) | 2021-09-16 | 2021-09-16 | Optical communication device and optical communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113949455B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677145A (en) * | 2004-03-30 | 2005-10-05 | 富士通株式会社 | Method and device for wavelength dispersion compensation |
| CN1790072A (en) * | 2004-12-17 | 2006-06-21 | 日立通讯技术株式会社 | Variable dispersion compensation equipment, optical transmission system using it and method of setting dispersion compensation quantity |
| CN101145855A (en) * | 2007-09-27 | 2008-03-19 | 中兴通讯股份有限公司 | A color dispersion compensation device and its method for optical network |
| JP2008098975A (en) * | 2006-10-12 | 2008-04-24 | Fujitsu Ltd | Receiver, transmitter, reception method and transmission method |
| JPWO2006137138A1 (en) * | 2005-06-23 | 2009-01-08 | 富士通株式会社 | Chromatic dispersion compensation control method and apparatus |
| CN101697499A (en) * | 2009-10-30 | 2010-04-21 | 中兴通讯股份有限公司 | Device and method for dispersion compensation |
| CN102843194A (en) * | 2012-09-12 | 2012-12-26 | 武汉邮电科学研究院 | Chromatic dispersion compensating system and method for wavelength selector switch type ROADM (Reconfigurable Optical Add Drop Multiplexer) |
| CN104320192A (en) * | 2014-09-26 | 2015-01-28 | 国网四川省电力公司信息通信公司 | High-speed optical transmission system for optical fiber |
| KR20160133874A (en) * | 2015-05-13 | 2016-11-23 | 주식회사 쏠리드시스템스 | Optical communication device for compensating dispersion of optical signal according to the transmission distance |
| CN106817168A (en) * | 2015-11-27 | 2017-06-09 | 埃弗顿网络股份有限公司 | Close optical transceiver module with optical amplifier |
| CN109067463A (en) * | 2018-08-01 | 2018-12-21 | 武汉光迅科技股份有限公司 | Zoom out optical fiber dispersion compensation device and method, remote access product, electronic equipment, non-transient computer readable storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004228715A (en) * | 2003-01-20 | 2004-08-12 | Fujitsu Ltd | Optical transmission system |
| US20110318019A1 (en) * | 2010-06-29 | 2011-12-29 | Tyco Electronics Subsea Communication LLC | Communication transmission system with optically aided digital signal processing dispersion compensation |
| US20120087661A1 (en) * | 2010-10-12 | 2012-04-12 | Christopher Michael Look | Long Distance Transmission Of Incoherent Optical Signals In An Optical Network |
| US9690049B2 (en) * | 2013-07-01 | 2017-06-27 | Tongqing Wang | Optical line protection with digital dispersion compensation module |
| CN115694621A (en) * | 2021-03-31 | 2023-02-03 | 北京百度网讯科技有限公司 | Signal processing method and signal processing system |
-
2021
- 2021-09-16 CN CN202111087839.XA patent/CN113949455B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677145A (en) * | 2004-03-30 | 2005-10-05 | 富士通株式会社 | Method and device for wavelength dispersion compensation |
| CN1790072A (en) * | 2004-12-17 | 2006-06-21 | 日立通讯技术株式会社 | Variable dispersion compensation equipment, optical transmission system using it and method of setting dispersion compensation quantity |
| JPWO2006137138A1 (en) * | 2005-06-23 | 2009-01-08 | 富士通株式会社 | Chromatic dispersion compensation control method and apparatus |
| JP2008098975A (en) * | 2006-10-12 | 2008-04-24 | Fujitsu Ltd | Receiver, transmitter, reception method and transmission method |
| CN101145855A (en) * | 2007-09-27 | 2008-03-19 | 中兴通讯股份有限公司 | A color dispersion compensation device and its method for optical network |
| CN101697499A (en) * | 2009-10-30 | 2010-04-21 | 中兴通讯股份有限公司 | Device and method for dispersion compensation |
| CN102843194A (en) * | 2012-09-12 | 2012-12-26 | 武汉邮电科学研究院 | Chromatic dispersion compensating system and method for wavelength selector switch type ROADM (Reconfigurable Optical Add Drop Multiplexer) |
| CN104320192A (en) * | 2014-09-26 | 2015-01-28 | 国网四川省电力公司信息通信公司 | High-speed optical transmission system for optical fiber |
| KR20160133874A (en) * | 2015-05-13 | 2016-11-23 | 주식회사 쏠리드시스템스 | Optical communication device for compensating dispersion of optical signal according to the transmission distance |
| CN106817168A (en) * | 2015-11-27 | 2017-06-09 | 埃弗顿网络股份有限公司 | Close optical transceiver module with optical amplifier |
| CN109067463A (en) * | 2018-08-01 | 2018-12-21 | 武汉光迅科技股份有限公司 | Zoom out optical fiber dispersion compensation device and method, remote access product, electronic equipment, non-transient computer readable storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 基于峰均值功率比的色散估计算法研究;王炫等;《光通信研究》;20201010(第05期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113949455A (en) | 2022-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7469104B2 (en) | COTDR arrangement for an undersea optical transmission system comprising multiple cable stations and multiple transmission segments | |
| KR19980081611A (en) | Signal transmission system and supervisory control method | |
| EP1182806B1 (en) | Optical transmission path monitoring system | |
| US7991287B2 (en) | Optical communication system with suppressed SBS | |
| Monroy et al. | Data transmission over polymer optical fibers | |
| WO2005086779A2 (en) | Method and apparatus for obtaining status information concerning an in-service optical transmission line | |
| Wakayama et al. | 400GBASE-LR4 and 400GBASE-LR8 transmission reach maximization using bismuth-doped fiber amplifiers | |
| Steenbergen | Everything You Always Wanted to Know About Optical Networking–But Were Afraid to Ask | |
| CN113949455B (en) | Optical communication device and optical communication system | |
| EP4160941A1 (en) | Distributed sensing and monitoring using amplified optical links | |
| US10128942B2 (en) | Method of transmitting an optical data signal via a fiber optical medium in opposite directions at the same carrier wavelength | |
| Zhu et al. | High capacity 400Gb/s real-time transmissions over AllWave ULL fibres by 400ZR/ZR+ pluggable modules | |
| MacHale et al. | 10Gb/s bidirectional transmission in a 116km reach hybrid DWDM-TDM PON | |
| Kim et al. | Novel in-service supervisory system using OTDR for long-haul WDM transmission link including cascaded in-line EDFAs | |
| Chen et al. | Demonstration of in-service supervisory repeaterless bidirectional wavelength-division-multiplexing transmission system | |
| Virgillito et al. | Propagation Impairment in Single-Wavelength, Single-Fiber Bidirectional Optical Transmission | |
| Luis et al. | Investigation of inter-core crosstalk and Raman nonlinearity in wideband MCF transmission | |
| Otani et al. | Fault localization of optical WDM submarine cable networks using coherent-optical time-domain reflectometry | |
| Willner et al. | Optical characterization, diagnosis, and performance monitoring for PON | |
| Ivaniga et al. | The In-Line placement of EDFA in CWDM/DWDM system for BER comparison at 1540 nm. | |
| Araki et al. | Extended optical fiber line testing system using new eight-channel L/U-band crossed optical waveguide coupler for L-band WDM transmission | |
| Kuo et al. | In-service OTDR-monitoring-supported fiber-Bragg-grating optical add-drop multiplexers | |
| EP2321679A1 (en) | Remote larger effective area optical fiber | |
| HASNI | Design and Optimization of Optical Fiber Network with a Mixed Technology 10Gbit/s TDM and 80Gbit/s WDM. | |
| Ji et al. | 700G/280G SDM-TWDM-PON over 20km Seven-Core Fibre based on 10G-Class Optical Components |
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 |