CN115988361A - High-speed low-cost PON realization method, equipment and system - Google Patents

High-speed low-cost PON realization method, equipment and system Download PDF

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Publication number
CN115988361A
CN115988361A CN202211537411.5A CN202211537411A CN115988361A CN 115988361 A CN115988361 A CN 115988361A CN 202211537411 A CN202211537411 A CN 202211537411A CN 115988361 A CN115988361 A CN 115988361A
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China
Prior art keywords
tap
tap coefficient
error rate
fir filter
bit error
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CN202211537411.5A
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李婕
罗鸣
张旭
杨超
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Wuhan Research Institute of Posts and Telecommunications Co Ltd
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Wuhan Research Institute of Posts and Telecommunications Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

The invention discloses a high-speed low-cost PON realization method, equipment and a system, relating to the technical field of optical access networks, wherein the high-speed low-cost PON realization method comprises the following steps: determining all tap coefficients of the corresponding FIR filter under the lowest bit error rate based on the received handshake data packet; and receiving a normal data packet by using the FIR filter with all the tap coefficients configured for communication. The invention can achieve the purpose of reducing the power consumption and the cost of the system and avoid the problem of time delay caused by a self-adaptive filter.

Description

High-speed low-cost PON realization method, equipment and system
Technical Field
The invention relates to the technical field of optical access networks, in particular to a high-speed low-cost PON (passive optical network) implementation method, equipment and a system.
Background
The popularity of smart phones, tablets, and portable devices has led to a continuous growth in home internet traffic. Heavy traffic data, both current and future, typically requires greater broadband access. Some technologies for future optical access communication have been extensively studied, but the most major challenge is to design low-cost optoelectronic devices to achieve higher transmission rates.
The high speed passive optical network (HSP) proposed by the International Telecommunication Union (ITU) specifies a 50Gb/s rate for the downlink and a 12.5, 25 or 50Gb/s rate for the uplink recommendations. The optical modulation signals are transmitted bidirectionally through a Standard Single Mode Fiber (SSMF), the maximum fiber length difference between the farthest subscriber and the nearest subscriber connected on the same PON system being 20 km.
However, due to two major problems faced by PONs 1) bandwidth limitations with low-cost optical components, 2) optical impairments due to chirp, noise and dispersion. As a result, the optical transmission signal experiences intersymbol interference (ISIs) and channel distortion that greatly degrades system performance. Digital Signal Processing (DSP) can be used to reduce ISIs, helping high-speed PON systems to achieve high optical power budget (> 29 dB) at 50 Gb/s. But this solution is complex to implement and process, power consuming and costly.
Disclosure of Invention
In view of the defects in the prior art, a first aspect of the present invention provides a method for implementing a high-speed and low-cost PON, which can achieve the purpose of reducing system power consumption and cost, and avoid the delay problem caused by an adaptive filter.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a high-speed low-cost PON realization method comprises the following steps:
determining all tap coefficients of the corresponding FIR filter under the lowest bit error rate based on the received handshake data packet;
and receiving a normal data packet by using the FIR filter with all the tap coefficients configured for communication.
In some embodiments, the determining all tap coefficients of the corresponding FIR filter at the lowest bit error rate based on the received handshake data packet includes:
initializing all tap coefficients except the center tap of the FIR filter pair to 0;
based on the received handshake data packet, adjusting the tap coefficient of the center tap, calculating the corresponding bit error rate, and taking the tap coefficient corresponding to the lowest bit error rate as the final tap coefficient of the center tap;
and determining the final tap coefficient again through the lowest bit error rate for the taps on two adjacent sides of the pair of taps with the determined final tap coefficient until all tap coefficients of the FIR filter are configured.
In some embodiments, the adjusting tap coefficients of the center tap based on the received handshake data packet, calculating a corresponding bit error rate, and using the tap coefficient corresponding to the lowest bit error rate as a final tap coefficient of the center tap, includes:
traversing from an initial value by a set step length in a set tap coefficient region, and calculating a corresponding bit error rate of each configuration data;
and determining the minimum bit error rate and the corresponding tap coefficient size as the final tap coefficient of the center tap.
In some embodiments, the tap coefficient region is [ -63,63], and the step size is 2.
A second aspect of the present invention provides a high-speed low-cost PON device, which can achieve the purpose of reducing system power consumption and cost, and avoid the delay problem caused by an adaptive filter.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-speed low-cost PON device comprising a receiving end unit, the receiving end unit comprising:
the FIR filter comprises a configuration state and a communication state, and is used for receiving a handshake data packet of a transmitting end when in the configuration state;
the error code calculation module is used for calculating the error code rate of the FIR filter under each tap coefficient based on the received handshake data packet;
the tap coefficient setting module is used for configuring the tap coefficients of all the taps into corresponding tap coefficients under the lowest bit error rate;
and when the FIR filter is in a communication state, the FIR filter receives a normal data packet at a sending end for communication based on the configured tap coefficient.
In some embodiments, the tap coefficient setting module is configured to configure the tap coefficients of all taps as corresponding tap coefficients at the lowest bit error rate, and includes:
initializing all tap coefficients except the center tap of the FIR filter pair to 0;
based on the received handshake data packet, adjusting a tap coefficient of a center tap, and based on the corresponding error rate calculated by the error code calculation module, taking the tap coefficient corresponding to the lowest error rate as a final tap coefficient of the center tap;
and determining the final tap coefficient again through the lowest bit error rate for the taps on two adjacent sides of the pair of taps with the determined final tap coefficient until all tap coefficients of the FIR filter are configured.
In some embodiments, the tap coefficient setting module adjusts a tap coefficient of the center tap based on the received handshake data packet, calculates a corresponding bit error rate, and uses the tap coefficient corresponding to the lowest bit error rate as a final tap coefficient of the center tap, including:
traversing from an initial value by a set step length in a set tap coefficient region, and recording a corresponding error rate calculated by the error code calculation module under each configuration data;
and determining the minimum bit error rate and the corresponding tap coefficient size as the final tap coefficient of the center tap.
In some embodiments, further comprising:
a semiconductor optical amplifier SOA for amplifying the optical signal input to the FIR filter.
In some embodiments, further comprising:
and the balanced photoelectric detector APD is used for performing photoelectric conversion on the optical signal amplified by the SOA and inputting the optical signal to the FIR filter.
A third aspect of the present invention provides a high-speed and low-cost PON system, which can achieve the purpose of reducing system power consumption and cost, and avoid the delay problem caused by an adaptive filter.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a high-speed low-cost PON system comprises a sending end unit, an optical distribution network unit and a receiving end unit;
the transmitting end unit is used for outputting the modulated optical signal to the receiving end unit through the optical distribution network unit;
the receiving end unit includes:
the FIR filter comprises a configuration state and a communication state, and is used for receiving a handshake data packet of a transmitting end when in the configuration state;
the error code calculation module is used for calculating the error code rate of the FIR filter under each tap coefficient based on the received handshake data packet;
the tap coefficient setting module is used for configuring the tap coefficients of all the taps into corresponding tap coefficients under the lowest bit error rate;
and when the FIR filter is in a communication state, the FIR filter receives a normal data packet at a sending end for communication based on the configured tap coefficient.
Compared with the prior art, the invention has the advantages that:
the high-speed low-cost PON realizing method of the invention determines all tap coefficients of the corresponding FIR filter under the lowest bit error rate based on the received handshake data packet; and receiving a normal data packet by using the FIR filter with all the tap coefficients configured for communication. Namely, a finite impulse response FIR filter is adopted at a receiving end of a direct detection PON system, and tap coefficients are set at the system initialization stage, so that the purposes of reducing the system power consumption and cost are achieved, and the problem of time delay caused by a self-adaptive filter is solved.
Drawings
Fig. 1 is a flowchart of a high-speed low-cost PON implementation method according to an embodiment of the present invention;
FIG. 2 is a flowchart of step S1 in FIG. 1;
FIG. 3 is a schematic diagram of a center tap selection in an embodiment of the present invention;
FIG. 4 is a diagram illustrating the determination of tap coefficients for a center tap in an embodiment of the present invention;
fig. 5 is a block diagram of a high-speed low-cost PON system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Aiming at the problems in the prior art, the embodiment of the invention adopts the finite impulse response FIR filter at the receiving end of the direct detection PON system and sets the tap coefficient at the system initialization stage, thereby achieving the purpose of reducing the system power consumption and the cost and avoiding the delay problem caused by the self-adaptive filter.
Specifically, referring to fig. 1, an embodiment of the present invention discloses a high-speed low-cost PON implementation method, which includes the following steps:
s1, determining all tap coefficients of the corresponding FIR filter under the lowest bit error rate based on the received handshake data packet.
It should be noted that, since the transmission length and the signal environment of each user are different, the tap coefficients of the FIR filter need to be configured separately. The use of adaptive dynamic configuration of filter tap coefficients results in a significant increase in data delay due to the use of a feedback structure. Therefore, the embodiment of the invention adopts the training packet to carry out the initialization configuration of the filter coefficient in the handshake phase. In the handshake phase, all tap coefficients except the two center taps are initialized to 0. And then according to the calculation and settlement result of the error code calculation module, the configuration is carried out from the center tap until all tap coefficients are configured.
Specifically, referring to fig. 2, step S1 includes:
and S11, initializing all tap coefficients except the center tap of the FIR filter pair to 0.
And S12, adjusting the tap coefficient of the center tap based on the received handshake data packet, calculating the corresponding error rate, and taking the tap coefficient corresponding to the lowest error rate as the final tap coefficient of the center tap.
Specifically, the middle two tap coefficients are selected in the region of [ -63,63], traversed by step 2 starting from-63, and the corresponding bit error rate is calculated for each configuration data. And selecting the pair of central tap coefficients corresponding to the lowest bit error rate as the final tap coefficient of the central tap.
It can be understood that the selection region of the tap coefficient and the step size can be reasonably set according to the needs, and the embodiment of the present invention is not limited herein.
And S13, determining the final tap coefficient again through the lowest bit error rate for the taps on the two adjacent sides of the pair of taps with the determined final tap coefficient until all tap coefficients of the FIR filter are configured.
And after the middle two tap coefficients are determined, setting the values of the two adjacent tap coefficients according to the error rate result by adopting the same method. For example, as shown in fig. 3 and 4, for a filter with 9 taps, the middle pair of taps W is first set 4 And W 5 Then, W shown in FIG. 3 is set 3 And W 6 . And setting all tap pairs in such a way until all tap coefficients are set. And for filters with an odd number of taps, the last step is to set the remaining single tap. And when all the tap coefficients are set, the initial group of tap coefficients of the FIR filter are searched.
And S2, receiving a normal data packet by using the FIR filter with all the tap coefficients configured for communication.
It should be noted that, if the corresponding set of coefficient data is set at the ONU receiving end, the initialization is terminated. If the OLT receives the data, different coefficients corresponding to different ONUs need to be recorded, and the data is set in the time slot of the ONU. And after the filter tap coefficient is set, ending the handshake packet and starting to transmit a normal data packet. When the operating environment changes, such as the transmission distance, and the number of users changes, the initialization process, i.e., the filter setting process, needs to be restarted.
In summary, in the high-speed low-cost PON implementation method of the present invention, all tap coefficients of a corresponding FIR filter at a lowest bit error rate are determined based on a received handshake data packet; and receiving a normal data packet by using the FIR filter with all the tap coefficients configured for communication. Namely, a finite impulse response FIR filter is adopted at a receiving end of a direct detection PON system, and tap coefficients are set at the system initialization stage, so that the purposes of reducing the system power consumption and cost are achieved, and the problem of time delay caused by a self-adaptive filter is solved.
Referring to fig. 5, an embodiment of the present invention further discloses a high-speed low-cost PON device, which includes a receiving end unit, where the receiving end unit includes an FIR filter, an error code calculation module, and a tap coefficient setting module.
The FIR filter comprises a configuration state and a communication state, and is used for receiving a handshake data packet of a sending end when in the configuration state; the error code calculation module calculates the error rate of the FIR filter under each tap coefficient based on the received handshake data packet; the tap coefficient setting module is used for configuring tap coefficients of all taps into corresponding tap coefficients under the lowest bit error rate; and when the FIR filter is in a communication state, the FIR filter receives a normal data packet of a sending end based on the configured tap coefficient for communication.
In some embodiments, the tap coefficient setting module is configured to configure the tap coefficients of all taps as corresponding tap coefficients at the lowest bit error rate, and includes:
initializing all tap coefficients outside the center tap of the FIR filter pair to 0;
based on the received handshake data packet, the tap coefficient of the center tap is adjusted, and based on the corresponding error rate calculated by the error code calculation module, the tap coefficient corresponding to the lowest error rate is used as the final tap coefficient of the center tap;
and determining the final tap coefficient again through the lowest error rate for the taps positioned at two adjacent sides of the pair of taps with the determined final tap coefficient until all tap coefficients of the FIR filter are configured.
In some embodiments, the tap coefficient setting module adjusts a tap coefficient of a center tap based on the received handshake data packet, calculates a corresponding bit error rate, and uses the tap coefficient corresponding to the lowest bit error rate as a final tap coefficient of the center tap, including:
traversing from an initial value by a set step length in a set tap coefficient region, and recording a corresponding error rate calculated by the error code calculation module under each configuration data;
and determining the minimum bit error rate and the corresponding tap coefficient size as the final tap coefficient of the center tap.
In some embodiments, further comprising:
a semiconductor optical amplifier SOA for amplifying the optical signal input to the FIR filter.
In some embodiments, further comprising:
and the balanced photoelectric detector APD is used for performing photoelectric conversion on the optical signal amplified by the SOA and inputting the optical signal to the FIR filter.
Referring to fig. 5, an embodiment of the present invention further discloses a high-speed low-cost PON system, which includes a sending end unit, an optical distribution network unit, and a receiving end unit.
The transmitting end unit is used for outputting the modulated optical signal to the receiving end unit through the optical distribution network unit.
The receiving end unit includes:
the FIR filter comprises a configuration state and a communication state, and is used for receiving a handshake data packet of a transmitting end when in the configuration state;
the error code calculation module is used for calculating the error code rate of the FIR filter under each tap coefficient based on the received handshake data packet;
the tap coefficient setting module is used for configuring the tap coefficients of all the taps into corresponding tap coefficients under the lowest bit error rate;
and when the FIR filter is in a communication state, the FIR filter receives a normal data packet at a sending end for communication based on the configured tap coefficient.
In some embodiments, the tap coefficient setting module is configured to configure the tap coefficients of all taps as corresponding tap coefficients at the lowest bit error rate, and includes:
initializing all tap coefficients outside the center tap of the FIR filter pair to 0;
based on the received handshake data packet, adjusting a tap coefficient of a center tap, and based on the corresponding error rate calculated by the error code calculation module, taking the tap coefficient corresponding to the lowest error rate as a final tap coefficient of the center tap;
and determining the final tap coefficient again through the lowest bit error rate for the taps on two adjacent sides of the pair of taps with the determined final tap coefficient until all tap coefficients of the FIR filter are configured.
In some embodiments, the tap coefficient setting module adjusts a tap coefficient of the center tap based on the received handshake data packet, calculates a corresponding bit error rate, and uses the tap coefficient corresponding to the lowest bit error rate as a final tap coefficient of the center tap, including:
traversing from an initial value by a set step length in a set tap coefficient region, and recording a corresponding error rate calculated by the error code calculation module under each configuration data;
and determining the minimum bit error rate and the corresponding tap coefficient size as the final tap coefficient of the center tap.
In some embodiments, further comprising:
a semiconductor optical amplifier SOA for amplifying the optical signal input to the FIR filter.
Specifically, in the embodiment of the present invention, NRZ data at a transmitting end is modulated by an MZM modulator, and then sent to a single-mode optical fiber for transmission, and then sent to a receiving end for reception after passing through a coupler or an optical splitter in an Optical Distribution Network (ODN). The optical signal sent to the receiving end is amplified through the SOA and then enters a balanced photoelectric detector (APD) for photoelectric conversion.
In summary, the high-speed low-cost PON system in the present invention includes a receiving end unit, where the receiving end unit determines all tap coefficients of a corresponding FIR filter at a lowest bit error rate based on a received handshake data packet; and receiving a normal data packet by using the FIR filter with all the tap coefficients configured for communication. Namely, a finite impulse response FIR filter is adopted at a receiving end of a direct detection PON system, and tap coefficients are set at the system initialization stage, so that the purposes of reducing the system power consumption and cost are achieved, and the problem of time delay caused by a self-adaptive filter is solved.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A high-speed low-cost PON realization method is characterized by comprising the following steps:
determining all tap coefficients of the corresponding FIR filter under the lowest bit error rate based on the received handshake data packet;
and receiving a normal data packet by using the FIR filter with all the tap coefficients configured for communication.
2. A high-speed low-cost PON implementation method according to claim 1, wherein the determining all tap coefficients of the corresponding FIR filter at the lowest error rate based on the received handshake data packet includes:
initializing all tap coefficients outside the center tap of the FIR filter pair to 0;
based on the received handshake data packet, adjusting the tap coefficient of the center tap, calculating the corresponding bit error rate, and taking the tap coefficient corresponding to the lowest bit error rate as the final tap coefficient of the center tap;
and determining the final tap coefficient again through the lowest bit error rate for the taps on two adjacent sides of the pair of taps with the determined final tap coefficient until all tap coefficients of the FIR filter are configured.
3. A high-speed low-cost PON realization method according to claim 2, wherein the adjusting tap coefficients of the center tap based on the received handshake data packets, calculating the corresponding bit error rate, and using the tap coefficient corresponding to the lowest bit error rate as the final tap coefficient of the center tap comprises:
traversing from an initial value by a set step length in a set tap coefficient region, and calculating a corresponding error rate of each configuration data;
and determining the minimum bit error rate and the corresponding tap coefficient size as the final tap coefficient of the center tap.
4. A high-speed low-cost PON realization method according to claim 3, characterized in that: the tap coefficient region is [ -63,63], and the step size is 2.
5. A high-speed low-cost PON device comprising a receiving-end unit, the receiving-end unit comprising:
the FIR filter comprises a configuration state and a communication state, and is used for receiving a handshake data packet of a transmitting end when in the configuration state;
the error code calculation module is used for calculating the error code rate of the FIR filter under each tap coefficient based on the received handshake data packet;
the tap coefficient setting module is used for configuring the tap coefficients of all the taps into corresponding tap coefficients under the lowest bit error rate;
and when the FIR filter is in a communication state, the FIR filter receives a normal data packet of a sending end based on the configured tap coefficient for communication.
6. The high-speed low-cost PON apparatus of claim 5, wherein the tap coefficient setting module is configured to configure the tap coefficients of all taps as corresponding tap coefficients at a lowest bit error rate, and comprises:
initializing all tap coefficients except the center tap of the FIR filter pair to 0;
based on the received handshake data packet, adjusting a tap coefficient of a center tap, and based on the corresponding error rate calculated by the error code calculation module, taking the tap coefficient corresponding to the lowest error rate as a final tap coefficient of the center tap;
and determining the final tap coefficient again through the lowest bit error rate for the taps on two adjacent sides of the pair of taps with the determined final tap coefficient until all tap coefficients of the FIR filter are configured.
7. The high-speed low-cost PON device according to claim 6, wherein the tap coefficient setting module adjusts a tap coefficient of the center tap based on the received handshake packet, calculates a corresponding bit error rate, and uses the tap coefficient corresponding to the lowest bit error rate as a final tap coefficient of the center tap, comprising:
traversing from an initial value by a set step length in a set tap coefficient region, and recording a corresponding error rate calculated by the error code calculation module under each configuration data;
and determining the minimum bit error rate and the corresponding tap coefficient size as the final tap coefficient of the center tap.
8. A high-speed, low-cost PON apparatus as recited in claim 5, further comprising:
a semiconductor optical amplifier SOA for amplifying the optical signal input to the FIR filter.
9. A high-speed low-cost PON device according to claim 8, further comprising:
and the balanced photoelectric detector APD is used for performing photoelectric conversion on the optical signal amplified by the SOA and inputting the optical signal to the FIR filter.
10. A high-speed low-cost PON system is characterized by comprising a sending end unit, an optical distribution network unit and a receiving end unit;
the transmitting end unit is used for outputting the modulated optical signal to the receiving end unit through the optical distribution network unit;
the receiving end unit includes:
the FIR filter comprises a configuration state and a communication state, and is used for receiving a handshake data packet of a transmitting end when in the configuration state;
the error code calculation module is used for calculating the error code rate of the FIR filter under each tap coefficient based on the received handshake data packet;
the tap coefficient setting module is used for configuring the tap coefficients of all the taps into corresponding tap coefficients under the lowest bit error rate;
and when the FIR filter is in a communication state, the FIR filter receives a normal data packet of a sending end based on the configured tap coefficient for communication.
CN202211537411.5A 2022-12-01 2022-12-01 High-speed low-cost PON realization method, equipment and system Pending CN115988361A (en)

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CN202211537411.5A CN115988361A (en) 2022-12-01 2022-12-01 High-speed low-cost PON realization method, equipment and system

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