KR20130085461A - Optical power control method of epon olt in optical line termination system - Google Patents

Optical power control method of epon olt in optical line termination system Download PDF

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KR20130085461A
KR20130085461A KR1020110127296A KR20110127296A KR20130085461A KR 20130085461 A KR20130085461 A KR 20130085461A KR 1020110127296 A KR1020110127296 A KR 1020110127296A KR 20110127296 A KR20110127296 A KR 20110127296A KR 20130085461 A KR20130085461 A KR 20130085461A
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ont
onts
optical
epon
reception
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KR1020110127296A
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Korean (ko)
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윤호성
박형진
김진희
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주식회사 케이티
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/08—Time-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE: A light power control method of an ethernet passive optical network (EPON) optical line terminal (OLT) in an optical line terminal system is provided to gather information of a light power level and the receive sensitivity of already installed optical network terminals (ONT) and new ONTs in a registration stage of the new ONTs for managing the optimal OLT light power output level. CONSTITUTION: A protocol processing unit (111) sets the level of the light power output based on the difference between the reception power and the receive sensitivity from messages received from more than one ONTs through a process of receiving the messages. The messages include information of the reception power and the receive sensitivity of a corresponding ONT. A transmitter outputs in the light power output level set by the data transmission to the ONTs after the setting from the protocol processing unit. [Reference numerals] (111) Protocol processing unit

Description

Optical Power Control Method of EPON OLT in Optical Line Termination System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical line termination system, and more particularly, to an optical line terminal (OLT) that applies an Ethernet passive optical network (EPON) protocol based on a time division multiplexing (TDM) connection scheme. The present invention relates to an optical line termination system for improving optical power efficiency during OLT downlink data transmission in data transmission between an optical line termination device) and an ONT (Optical Network Terminal).

EPON technology is one of the FTTH (Fiber To The Home) technologies standardized by ITU-T and IEEE, which are standardization bodies, to effectively provide the data required for the subscriber end, and many ONTs are passive devices such as splitters (optical splitters). By sharing a single OLT, Ethernet-based broadband data transmission is possible.

In line with the trend of lowering network power, the development of technology to improve power consumption by integrating multiple PON OLTs such as Quad (4) / Octal (8) in one EPON OLT chipset, but waste in the EPON OLT transmitter There is no technology for optimizing the optical power.

For example, if the equipment is developed and operated to have a preset power budget of 27 to 30 dB for the downlink data transmission of the OLT to the ONT in such an EPON optical communication network, the loss is actually within 20 dB in a typical subscriber accommodation environment within 3 km. Since only 7dB or more of optical power is wasted, there is a problem in that unnecessary optical power loss occurs when the OLT transmitter (laser diode) is operated with a predetermined power budget.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to transmit downlink data of an OLT transmitter (laser diode) in data transmission between an OLT and an ONT applying an EPON protocol based on a TDM connection scheme. In order to optimize the city's optical power, it is possible to set and operate an optimized OLT optical power output level by combining information on the already installed ONTs, the reception sensitivity and the received optical power level of the new ONTs during the registration process of the new ONT. An optical line termination system is provided.

In the following detailed description of the preferred embodiment of the present invention with reference to the accompanying drawings and the contents described in the accompanying drawings in the following detailed description of the invention, the features of the present invention, in summary, According to an aspect of the present invention, an operation method of an optical line termination system for data transmission between one optical line terminal (OLT) and a plurality of optical network terminals (ONTs) shared through a splitter may include a message transmitted from the OLT to the ONT. Performing a process of receiving, by the OLT, a message including information on a reception optical power level and a reception sensitivity of the corresponding ONT; And setting a level for the optical power output based on a difference between the reception power and the reception sensitivity of the one or more ONTs according to the message received from the one or more ONTs in the OLT through the process and the transmitter being configured for subsequent data transmission to the ONT. Controlling to output at a level for the optical power output.

The OLT receives the burst mode data transmitted from the ONT in a time division multiplexing (TDM) connection scheme and is based on the Point-to-Multipoint Control Protocol (MPCP) of the Ethernet Passive Optical Network (EPON). Characterized by processing the process for setting the level for the power output.

The OLT classifies 1G (bps) and 10G (bps) data transmission and reception, and performs optical communication in a WDM (Wavelegth Division Multiplexing) scheme and a TDM (Time Division Multiplexing) scheme in a downward direction.

The operation method of the optical line termination system includes the optical power output of a 1G (bps) data transmitter or a 10G (bps) data transmitter for data transmission to the ONT of each group of 1G EPON ONTs or a group of 10G EPON ONTs. You can set the level.

Receive a message containing information on reception power and reception sensitivity from a new ONT newly installed at the OLT, and the differences in reception power and reception sensitivity already stored for at least one ONT already installed and the reception power for the new ONT. And the level of the optical power output may be set to determine the minimum value of the difference between the and the reception sensitivity to lower the optical power output of the transmitter by less than the minimum value. At this time, if the new ONT belongs to the 1G EPON ONT group, the minimum value of the difference between the received power and reception sensitivity already stored for the one or more 1G EPON ONTs already installed and the difference between the reception power and the reception sensitivity for the new ONT is determined. Judge and adjust the optical power output of the 1G (bps) data transmitter, and if the new ONT belongs to the 10G EPON ONT group, the differences in received power and reception sensitivity already stored for one or more 10G EPON ONTs already installed and the new The optical power output of the 1G0 (bps) data transmitter can be adjusted by determining the minimum value of the difference between the received power and the sensitivity of the ONT.

Alternatively, the OLT receives a message including information on reception power and reception sensitivity from a plurality of ONTs already installed, and determines a minimum value among differences between reception power and reception sensitivity for the plurality of ONTs to determine the minimum value. The level of the optical power output may be set to lower the optical power output of the transmitter by the following. Here, respectively, the group of 1G EPON ONTs and the group of 10G EPON ONTs are respectively determined, and the corresponding minimum value is determined for a plurality of already installed 1G EPON ONTs to adjust the optical power output of the 1G (bps) data transmitter, or a plurality of already installed The optical power output of the 10G (bps) data transmitter can be adjusted by determining the corresponding minimum value for the 10G EPON ONT.

According to another aspect of the present invention, an optical line termination system includes a plurality of optical network terminals (ONTs) and optical line terminals (OLTs) for data transmission and reception, which are shared through a splitter, and the OLTs are configured as ONTs. The process of receiving a message containing information about the reception power and reception sensitivity that the corresponding ONT responds to according to the transmitted message, thereby determining the difference between the reception power and reception sensitivity of one or more ONTs according to the messages received from the one or more ONTs. A protocol processor configured to set a level for the optical power output based on the result; And a transmitter for outputting at the level for the optical power output set in the data transmission to the ONT after the setting.

According to the optical line termination system according to the present invention, the information on the reception sensitivity and optical power of the already installed ONTs and the new ONTs in the registration process of the new ONT is optimized for the downlink data transmission of the OLT transmitter (laser diode). By setting and operating the optical power output level, the power efficiency of the OLT can be improved.

1 is a view for explaining an optical line termination system according to an embodiment of the present invention.
2 is a flow chart for explaining the operation of the optical line termination system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

1 is a view for explaining an optical line termination system 100 according to an embodiment of the present invention.

Referring to FIG. 1, an optical line termination system 100 according to an embodiment of the present invention includes a plurality of ONTs shared through one optical line terminal (OLT) 110 and a splitter 120. (Optical Network Terminal) 130, and based on the EPON (Ethernet Passive Optical Network) protocol to enable the transmission of data using the optical signal between the OLT 120 and the ONT (130).

Hereinafter, the optical line termination system 100 will be described as having an EPON structure in an optical communication network method using FTTH (Fiber To The Home) technology. However, the present invention is not limited thereto. The operation technology of the optical line termination system 100 can be applied to other optical communication network systems having a point-to-multipoint structure such as G-PON (Gigabit-capable PON) and XG-PON (10 Gigabit-capable PON). Note that it can be applied similarly.

As shown in FIG. 1, the OLT 110 may include a protocol processor 111 that is responsible for data processing of an EPON protocol-based MAC (media access control) layer and a physical layer, and WDM (Wavelegth Division Multiplexing). WDM filter 115 for combining up and down optical signals in a manner, and 1G (bps) or 10G (bps) data data in burst mode transmitted upward in the ONT 130 of a time division multiplexing (TDM) connection scheme. Transmitting the data processed for transmission in the dual-rate burst mode receiver (BMR) 114 and the protocol processor 111 at a 10G (bps) / 1G (bps) data rate using a laser diode (or photodiode), respectively. 10G transmitter 112 / 1G transmitter 113 for.

Here, the OLT 110 distinguishes between 1G (bps) and 10G (bps) data transmission and reception so as to cope with ONT of a 1G-EPON structure or a 10G-EPON structure, a dual-rate BMR 114 and a 10G transmitter. 112, but described as having a 1G transmitter 113, but is not limited to this, BMR for receiving data of a single data rate instead of these to correspond to only the ONT of the 1G-EPON structure or 10G-EPON structure And only one of 10G transmitter and 1G transmitter.

According to such a structure, when the burst mode data (1G (bps) or 10G (bps)) is transmitted from the ONT 130 of the TDM (Time Division Multiplexing) connection method, the WDM filter 115 passes through the splitter 120. Therefore, the uplink optical signal data of the ONT 130 coming through the optical path may be received, and the received uplink signal may be digitally processed through the BMR 114 and transmitted to the protocol processor 111. In addition, the protocol processing unit 111 processes the corresponding 1G (bps) or 10G (bps) data according to the destination ONT of the downlink data, and transmits the data to the transmitters 112 and 113, and transmits the corresponding wavelengths through the WDM filter 115. The downlink optical signal data may be transmitted to the splitter 120 along the optical path to be received by the ONT 130 according to the distribution of the splitter 120.

In particular, in the present invention, the optimized optical power output for downlink data transmission to the ONT of the OLT 110 transmitter by combining information on the ONTs already installed in the registration process of the new ONT and the reception sensitivity and the received optical power level of the new ONT. The level can be set and operated. The protocol processing unit 111 may process a process for setting the level for the optimized optical power output based on the point-to-multipoint control protocol of EPON by receiving the burst mode data transmitted from the ONT of the TDM connection method. have.

For example, the protocol processing unit 111 receives a reception power (eg, response) of the corresponding ONT 130 according to a message (eg, Discovery_Gate) transmitted to the ONT (eg, a newly installed new ONT) 130 for registration. Through the process of receiving a message (for example, REGISTER_REQ) that contains information about RSSI) and reception sensitivity (e.g., SENS), one or more ONTs (e.g., there may be ONTs already installed in addition to the new ones installed). Sets the level for the optimized optical power output based on the difference between the received power of one or more ONTs and the received sensitivity (eg, multiple as above as RSSI-SENS) in accordance with the message received from (eg REGISTER_REQ). Can be. Accordingly, when the level for the optimized optical power output is set, the protocol processing unit 111 transmits the data to the transmitter 112/113 in the subsequent data transmission to the ONT (for example, there may be an ONT installed in addition to the new ONT newly installed). ) Can be controlled to output at the level for the optical power output set as above by using an optical signal generating means such as a laser diode.

At this time, since the protocol processing unit 111 transmits corresponding 1G (bps) or 10G (bps) data through the transmitters 112 and 113, respectively, according to the destination ONT of the downlink data, 1G EPON ONTs and 10G EPON ONTs. By dividing the downlink signal with respect to the 10G transmitter 112 and 1G transmitter 113, it is possible to set the level for the optimized optical power output, respectively.

Hereinafter, the operation of the optical line termination system 100 according to an embodiment of the present invention will be described in more detail with reference to the flowchart of FIG. 2.

In order to set the level for the optimized optical power output of the OLT 110 transmitter 112/113 in the optical line termination system 100 according to an embodiment of the present invention, a discovery process defined in IEEE 802.3 Process can be changed and utilized.

First, the level of the optical power output of the transmitter 112/113 of the OLT 110 at the start of the registration process may be set to a maximum in advance (S10), the protocol processing unit 111, registration through the registration process According to a message (eg, Discovery_Gate) broadcast to the transmitter 112/113, ONT (eg, a newly installed new ONT) 130 through the WDM filter 115 (S11), unregistered to receive it The ONT 130 responds with a registration request message (e.g., REGISTER_REQ) after a certain time for grant, and at this time, the registration request message (e.g., REGISTER_REQ) receives a received power (e.g., RSSI, Received Signal Strength Indicator) Information on sensitivity (eg, SENS, Sensitivity) may be included (S12). The ONT 130 has information on reception sensitivity (eg, SENS), and may measure reception power (eg, RSSI) for a signal received from the OLT 110 transmitter 112/113. Receive sensitivity (e.g., SENS) represents the lowest received power that guarantees communication quality, i.e., corresponds to the received power that can guarantee communication quality for further received power according to the specification of the device. For example, if the receive sensitivity (eg SENS) is -25 dBm and the receive power (eg RSSI) for the signal received from the OLT 110 transmitter 112/113 is -15 dBm, then the ONT yields a margin of 10 dB. Communicate with them.

Through this registration process, some other ONTs may simultaneously respond with the above registration request message (eg, REGISTER_REQ) within the Discovery_Window at a given time.

The protocol processing unit 111 that receives the above registration request message (eg, REGISTER_REQ), the splitter 120, the WDM filter 115, and the BMR 114 from the ONT or the ONTs 130 stores the same. In operation S20, the level of the optimized optical power output may be set based on a difference between the reception power of the one or more ONTs and the reception sensitivity (for example, there may be a plurality as RSSI-SENS).

For example, when the protocol processor 111 receives a message (eg, REGISTER_REQ) including information on reception power (eg, RSSI) and reception sensitivity (eg, SENS) from a new ONT newly installed as described above, The difference between the reception power and reception sensitivity previously stored for one or more installed ONTs, and the difference between the reception power and reception sensitivity for the new ONT as described above are determined to determine the minimum of the differences. For example, if ONT 1 is a new ONT newly installed, and ONT 2 to ONT N are already installed and installed ONTs through the above registration process, the received power and reception sensitivity of ONT 2 to ONT N that have already been stored The difference and the difference between the received power and receive sensitivity of the new ONT 1 are combined to determine the minimum of the differences.

For example, ONT 1 driven by 1G-EPON has a received power (eg RSSI) of -15 dBm for a 1G (bps) signal received from the OLT 110 transmitter 112/113, and a receive sensitivity (eg, SENS) is -25 dBm, the difference (RSSI-SENS) has a margin of 10 dBm. In addition, in the same manner, the protocol processing unit 111 may calculate respective corresponding differences RSSI-SENS between ONT 2 and ONT N , and may obtain a minimum value among all the corresponding differences. Accordingly, since the margins should be greater than or equal to 0 for all ONTs, the protocol processing unit 111 may use the optical power of the transmitter 112/113 as much as the minimum value obtained above, for example, the minimum value or a value smaller than a minimum reference value. The level of the optical power output of the optical signal generating means of the transmitter 112/113 can be set to lower the output (eg, modulation current, bias current).

At this time, the protocol processing unit 111 may calculate the above minimum values for the 1G downlink signal and the 10G downlink signal separately, and set the level of the optimized optical power output for each group of the destination ONTs. That is, when the newly installed new ONT belongs to the 1G EPON ONT group, the protocol processing unit 111 performs the difference between the received power and reception sensitivity previously stored for the one or more installed 1G EPON ONTs, and the new ONT as described above. By combining the difference between the reception power and the reception sensitivity for the minimum value of the difference can be determined, according to the above method it is possible to set the level for the optical power output optimized for the 1G transmitter 113. In addition, when the new ONT newly installed as described above belongs to the 10G EPON ONT group, the protocol processing unit 111 may determine the differences in the received power and reception sensitivity that have already been stored for one or more installed 1G EPON ONTs, and the new 10G as described above. The difference between the reception power and the reception sensitivity for the EPON ONT can be combined to determine the minimum of the differences, and thus the level for the optimized optical power output for the 10G transmitter 112 can be set in this manner. .

As such, an optimal level for optical power output can be set by receiving a registration request message (eg, REGISTER_REQ) through a registration process for a newly installed ONT. You will also need to reset and update the level for the power output. For example, the protocol processor 111 may broadcast the above Discovery_Gate message to ONTs already installed at regular intervals and receive a REGISTER_REQ message including information on reception power and reception sensitivity from the ONTs in response thereto. The design may be modified so as to determine a minimum value among the differences based on the information on the reception power and the reception sensitivity received from the ONTs as described above. Reset the level for the optical power output of the optical signal generating means of the transmitter 112/113 to lower the optical power output (e.g., modulation current, bias current) of the transmitter 112/113 by a value as small as a predetermined reference value. Could be Here, the protocol processing unit 111 is divided into a group of 1G EPON ONTs and a group of 10G EPON ONTs, respectively, so that the transmitter 113 corresponding to the 1G EPON ONTs and the transmitter 112 corresponding to the 10G EPON ONTs are respectively provided. You can also update by resetting the level for the optical power output.

On the other hand, when the level for the optimized optical power output is set, the protocol processor 111 transmits the transmitter (in all data transmissions to a later ONT (eg, there may be an ONT already installed in addition to the newly installed ONT). 112/113 may be controlled to output the level of the optical power output optimized and set as described above using an optical signal generating means such as a laser diode.

When the level for the optimized optical power output is set as above, the protocol processing unit 111 continues the registration process with the above output level and transmits the registration request message (eg, REGISTER_REQ) to the ONT where the registration message (eg, REGISTER) is transmitted. In this case, a registration message (eg, REGISTER) may be transmitted by adding an information flag indicating that the level of the optimized optical power output is set as described above.

In addition, the protocol processing unit 111 continues the registration process and transmits a message (for example, GATE) for causing the ONT that has transmitted a registration request message (for example, REGISTER_REQ) to respond to the registration confirmation (S22). May respond with a message (REGISTER_ACK) indicating the registration confirmation (S23).

Accordingly, the process for determining the level of the optimized optical power output through the registration process in the OLT (110) is completed, the OLT (110) to the subsequent Ethernet-based 1G (bps) or 10G (bps) data corresponding to the ONT In this case, power efficiency can be improved by transmitting at the optimized optical power level.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

110: OLT
120: splitter
130: ONT

Claims (9)

In a method for operating an optical line termination system for data transmission between a single optical line terminal (OLT) and a plurality of optical network terminals (ONT) shared through a splitter,
Performing a process of receiving a message including information on reception power and reception sensitivity to which the ONT responds according to the message transmitted from the OLT to the ONT; And
The process sets the level for the optical power output based on the difference between the received power and the received sensitivity of the one or more ONTs according to the message received from the one or more ONTs in the OLT and the transmitter sets the level for subsequent data transmission to the ONT. Controlling the output to a level for the power output
Operating method of the optical line termination system comprising a. The method of claim 1,
The OLT receives the burst mode data transmitted from the ONT of a time division multiplexing (TDM) connection scheme and outputs the optical power based on a point-to-multipoint control protocol (EPON) of the Ethernet Passive Optical Network (EPON). Operating a process for setting a level for an optical line termination system. The method of claim 1,
The OLT classifies 1G (bps) and 10G (bps) data transmission and reception, and performs optical communication in a WDM (Wavelegth Division Multiplexing) method and a TDM (Time Division Multiplexing) method in a downward direction. Operation method of optical line termination system. The method of claim 1,
For setting the level of optical power output of a 1G (bps) data transmitter or a 10G (bps) data transmitter for data transmission to a ONT of a group of 1G EPON ONTs or each group of a group of 10G EPON ONTs. How to operate a line termination system. The method of claim 1,
Receive a message containing information on reception power and reception sensitivity from a new ONT newly installed at the OLT, and the differences in reception power and reception sensitivity already stored for at least one ONT already installed and the reception power for the new ONT. And determining the minimum value of the difference between the receiver sensitivity and setting the level of the optical power output to adjust the optical power output of the transmitter by less than the minimum value. The method of claim 5,
If the new ONT belongs to the 1G EPON ONT group, the minimum value of the difference between the already stored reception power and reception sensitivity for one or more 1G EPON ONTs already installed and the difference between the reception power and reception sensitivity for the new ONT is determined. Adjust the optical power output of the 1G (bps) data transmitter,
If the new ONT belongs to the 10G EPON ONT group, the minimum value of the difference between the already stored reception power and reception sensitivity for one or more 10G EPON ONTs already installed and the difference between the reception power and reception sensitivity for the new ONT is determined. A method of operating an optical line termination system, characterized by adjusting the optical power output of a 1G0 (bps) data transmitter. The method of claim 1,
In the OLT, a message including information on reception power and reception sensitivity is respectively received from a plurality of ONTs already installed, and the minimum value of the differences between the reception power and reception sensitivity for the plurality of ONTs is determined to be equal to or less than the minimum value. And setting a level for the optical power output to adjust the optical power output of the transmitter. The method of claim 7, wherein
Separate the groups of 1G EPON ONTs and groups of 10G EPON ONTs, and adjust the optical power output of the 1G (bps) data transmitter by determining the corresponding minimum value for the plurality of 1G EPON ONTs already installed, or the plurality of 10G already installed A method for operating an optical line termination system, characterized by adjusting the optical power output of a 10G (bps) data transmitter by determining a corresponding minimum value for EPON ONT. It includes a plurality of ONT (Optical Network Terminal) and OLT (Optical Line Terminal) for transmitting and receiving data shared through the splitter,
The OLT is,
The process of receiving a message containing information about the reception power and reception sensitivity that the ONT responds to in response to a message sent to the ONT, and between the reception power and reception sensitivity of one or more ONTs according to messages received from the one or more ONTs. A protocol processor configured to set a level for the optical power output based on the difference; And
A transmitter for outputting at the level for the optical power output set in the data transmission to the ONT after the setting
Optical line termination system comprising a.
KR1020110127296A 2011-11-30 2011-11-30 Optical power control method of epon olt in optical line termination system KR20130085461A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150056948A (en) * 2013-11-18 2015-05-28 주식회사 쏠리드 Optical relay system capable of improvement of power consumption
US9553692B2 (en) 2014-04-30 2017-01-24 Electronics And Telecommunications Research Institute Method and system for determining and controlling power of optical transmitter of optical network unit for time and wavelength division multiplexing passive optical network

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150056948A (en) * 2013-11-18 2015-05-28 주식회사 쏠리드 Optical relay system capable of improvement of power consumption
US9553692B2 (en) 2014-04-30 2017-01-24 Electronics And Telecommunications Research Institute Method and system for determining and controlling power of optical transmitter of optical network unit for time and wavelength division multiplexing passive optical network
US9825710B2 (en) 2014-04-30 2017-11-21 Electronics And Telecommunications Research Institute Method and system for determining and controlling power of optical transmitter of optical network unit for time and wavelength division multiplexing passive optical network

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