KR102259886B1 - Apparatus and method for tuning optical transceiver wavelength - Google Patents

Abstract

The method of adjusting the wavelength of an optical transceiver using an optical transceiver management apparatus according to an embodiment of the present invention includes the steps of monitoring the wavelength of an optical signal using a measuring instrument, in the optical transceiver management apparatus, the wavelength of the monitored optical signal Selecting a channel requiring adjustment from among, adjusting the output wavelength of the tunable subcarrier transmitter of the optical transceiver management device to the channel requiring adjustment, and transmitting wavelength adjustment information to the channel requiring adjustment can be configured.

Description

Optical transceiver wavelength tuning apparatus and method using an optical splitter coupler {Apparatus and method for tuning optical transceiver wavelength}

The present invention relates to an apparatus and method for adjusting the wavelength of an optical transceiver using an optical splitter coupler.

An optical transceiver is an essential component of an optical communication network. Specifically, the optical transceiver is a compound word of a transmitter meaning an optical transmitter and a receiver meaning a receiver. It converts an electrical signal into a light signal and a light signal between an optical cable connecting the optical communication network and the transmission equipment in charge of data transmission. It serves to convert into an electrical signal and exchanges data.

Demand for such an optical transceiver is increasing rapidly due to the development of communication technology and rapid increase in data traffic.

Meanwhile, in the case of a WDM optical transmission network, AWG or TFF is used for wavelength multiplexing. In such a multiplexing/demultiplexing device, an optical wavelength that can pass through each port is determined. Therefore, the optical transceiver connected to the multiplexing/demultiplexing device must output an optical wavelength suitable for the corresponding port in order to be able to accurately communicate.

In particular, wavelength stabilization technology for fixing the wavelength of an optical transceiver is essential for high-density wavelength multiplexing.

A conventional wavelength stabilization technique includes a method of using a Wavelength Locker.

Because wavelength stabilization technology using Wavelength Locker is expensive, it was difficult to apply to optical subscriber networks where low construction cost is essential.

As another prior art for solving this problem, wavelength stabilization was implemented by adjusting only the temperature of the laser element of the optical transceiver, but the wavelength is highly likely to change in the long term due to causes such as aging of parts.

Accordingly, the present invention proposes an apparatus and method for monitoring a wavelength operation state of an optical transceiver in a high-density wavelength multiplexing optical network in an in-service state and adjusting the wavelength when a problem occurs.

The present invention uses an optical transceiver management device using an optical splitter coupler to monitor a case where a wavelength is changed during use, and proposes an apparatus and method for adjusting the wavelength when a problem occurs.

The method of adjusting the wavelength of an optical transceiver using an optical transceiver management apparatus according to an embodiment of the present invention includes the steps of monitoring the wavelength of an optical signal using a measuring instrument, in the optical transceiver management apparatus, the wavelength of the monitored optical signal Selecting a channel requiring adjustment from among, adjusting the output wavelength of the tunable subcarrier transmitter of the optical transceiver management device to the channel requiring adjustment, and transmitting wavelength adjustment information to the channel requiring adjustment can be configured.

The method of adjusting the wavelength of an optical transceiver according to another embodiment of the present invention provides a method of adjusting the transmission wavelength of an optical transceiver of multiple channels communicating with optical signals of different wavelengths through an optical transmission line and MUX/DeMUX.

The method branches the optical signals transmitted from the plurality of optical transceivers 200 from the optical transmission line to the optical transceiver management apparatus 400 through the optical splitter coupler, and extracts the optical signal of each channel, the extracted optical signal An optical signal wavelength measurement step of measuring the wavelength of an optical signal by inputting to the optical wavelength measuring instrument 900, the optical transceiver management device 400 from the wavelength information of the measured optical signal to identify a channel requiring wavelength adjustment. The channel identification step, the step of generating, by the optical transceiver management apparatus 400, a wavelength adjustment signal containing wavelength adjustment information for the identified wavelength adjustment required channel, the generated wavelength adjustment signal to a preset wavelength of the channel It may include a wavelength adjustment signal transmission step of loading the sub-carrier and transmitting it to the optical transceiver, and a wavelength adjustment step of adjusting the wavelength of the optical signal generated by the optical transceiver receiving the wavelength adjustment signal.

Also, in the present invention, the transmission of the wavelength adjustment signal may be set so that the optical transceiver is transmitted in a guard time interval inserted between subcarriers communicating with another optical transceiver in mutual subcarriers.

The wavelength adjustment method of the optical transceiver of the present invention is a wavelength measuring instrument for generating wavelength information of an optical signal by measuring the wavelength of an optical signal branched from the optical transmission line through an optical splitter coupler, and the optical signal of the optical transceiver from the wavelength measuring device It can be achieved with an optical transceiver management device that analyzes the wavelength to determine whether wavelength adjustment is necessary and transmits wavelength adjustment information to the optical transceiver through an optical splitter coupler if necessary.

The present invention remotely inspects the wavelength state while the network is in operation, and when a problem occurs, the wavelength can be adjusted.

1 is a diagram showing the configuration of a communication network including an optical transceiver management apparatus and an optical transceiver management apparatus using an optical branch coupler according to an embodiment of the present invention.
2 is a diagram illustrating a case in which a plurality of optical transceivers are connected to one optical transmission line through MUX/DeMUX.
FIG. 3 is a diagram illustrating a case in which a wavelength measuring instrument 900 (OCA) is connected to the front end of the optical transceiver management apparatus in addition to the configuration of FIG. 2 .
4 is a diagram illustrating a case in which wavelength adjustment is required according to an embodiment of the present invention.
5 is a view showing that the wavelength meter 900 is included in the optical transceiver management apparatus.
6 is a diagram illustrating communication with a guard time between subcarrier communication signals performing subcarrier communication between the COT side and the RT side between optical transceivers.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

Throughout the specification, when a part is said to be “connected” to another part, it includes not only the case where it is “directly connected” but also the case where it is “electrically connected” with another element interposed therebetween. . Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. As used throughout this specification, the term “step for” or “step for” does not mean “step for”.

The terms used in the present invention have been selected as currently widely used general terms as possible while considering the functions in the present invention, which may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, and the like. In addition, in specific cases, there are also terms arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term.

1. A communication network for adjusting the wavelength of an optical transceiver using an optical splitter coupler according to an embodiment of the present invention

1 to 3 are diagrams showing the configuration of a communication network including an optical transceiver management apparatus and an optical transceiver management apparatus using an optical branch coupler 600 according to an embodiment of the present invention.

1.1. Optical communication network including an optical transceiver management device (400)

An optical communication network including an optical transceiver management apparatus 400 that is the basis of the present invention will be described with reference to FIG. 1 .

1 is an optical communication network in which a COT (Central Office Terminal) side host device 100 and an optical transceiver 200 are connected to an RT (Remote Terminal) side host device 700 and an optical transceiver 300 through an optical transmission line 500 . shows The optical signal of the optical transmission line is branched to the optical transceiver management device 400 by the optical splitter 600, or the optical signal from the optical transceiver management device 400 is coupled to the optical transmission line through the optical splitter 600, may be transmitted to the transceivers 200 and 300 . 1A is an optical communication network using a dual core optical transmission line, and FIG. 1B is an example using a single core optical transmission line.

Meanwhile, the optical transceiver management apparatus may include a tunable subcarrier transmitter, a CPU, and an EMS, and the tunable subcarrier transmitter may include a subcarrier transmitter and a tunable optical transmitter.

FIG. 2 is a view showing the COT side of an optical communication network configured such that a plurality of optical transceivers communicate with a plurality of optical transceivers through optical transmission lines using respective channels. The N number of optical transceivers 200n or less are connected to the optical transmission line through the multiplexing device 800 having N channels and a pass wavelength of each channel is determined. Although MUX/De-MUX is illustrated as an example of the multiplexer 800 in FIG. 2 , a cyclic AWG may be applied.

Hereinafter, an optical communication network for adjusting the wavelength of an optical transceiver according to an embodiment of the present invention will be described with reference to FIG. 3 .

Compared with FIGS. 1 and 2, the optical communication network of FIG. 3 further includes an optical wavelength measuring instrument 900 for an optical signal branched from the optical transmission line.

The optical wavelength measuring device measures the wavelength of the optical signal transmitted by the optical transceiver of each channel from the optical signal branched from the optical transmission line, and transmits it to the optical transceiver management device 400 . The control unit/management unit 420 of the optical transceiver management apparatus 400 identifies a signal requiring wavelength adjustment. The optical wavelength measuring instrument 900 may be configured separately from the optical transceiver management device 400 as shown in FIG. 3 , and may be configured to be integrated into the optical transceiver management device 400 as shown in FIG. 5 .

As the optical wavelength measuring device, an optical spectrum analyzer (OSA) or a wavelength meter (WM) may be used.

1.2. Identification of channels requiring wavelength adjustment and transmission of wavelength adjustment signals

As shown in FIG. 4 , it is possible to determine a signal requiring wavelength adjustment. It is possible to identify an optical signal that deviates by W1 from a preset central wavelength with the wavelength of each channel to determine a channel requiring wavelength adjustment.

When the channel requiring wavelength adjustment is identified, the control unit/management unit 420 of the optical transceiver management apparatus 400 generates a wavelength adjustment signal and transmits the wavelength adjustment signal with the wavelength of the corresponding channel through the tunable subcarrier transmitter.

The wavelength adjustment signal may be transmitted in a guard time period set between subcarrier communication periods in which optical transceivers communicate with each other as shown in FIG. 6 .

1.3. Wavelength adjustment of optical transceivers

Meanwhile, in the present invention, the first and second optical transceivers constituting the optical transceivers constituting each communication channel through the multiplexer 800 may be the same optical transceiver.

An optical transceiver pair including the first and second optical transceivers can communicate with each other on one optical transmission line through each channel of the multiplexer 800 .

Specifically, each of the first and second optical transceivers may be configured to include a host interface, a CPU (TRx) subcarrier transmitter, a subcarrier receiver, a wavelength adjuster, an optical transmitter, an optical receiver, and an amplifier.

The wavelength adjustment signal for the channel requiring the wavelength adjustment may be transmitted on a subcarrier having the wavelength of the corresponding channel. The wavelength adjustment signal passes through only the corresponding channel of the multiplexer 800 and is transmitted to the optical transceiver of the corresponding channel, and the wavelength adjustment signal is received by the subcarrier receiver of the optical transceiver of the corresponding channel. Then, the wavelength adjustment unit of the optical transceiver adjusts the transmission wavelength of the optical transmitter to match the wavelength adjustment signal.

2. Wavelength adjustment method of an optical transceiver according to the present invention

A method of adjusting the wavelength through the optical transceiver management device and by using the optical transceiver management device will be described.

2.1. Optical signal extraction step

This is the step of branching and extracting the optical signal transmitted from the optical transceiver from the optical transmission line of the optical communication network constituting the present invention to the optical transceiver management apparatus 400 through the optical branch coupler 600 . The extracted optical signal is input to the optical wavelength meter 900 .

2.2. Wavelength measurement step of optical signal

This is a step of measuring the wavelength of the optical signal by inputting the extracted optical signal to the optical wavelength measuring instrument 900 . The optical wavelength measuring instrument 900 transmits the measured wavelength information to the optical transceiver management apparatus 400 .

2.3. Wavelength adjustment signal generation step

This is a step of generating a wavelength adjustment signal by analyzing the wavelength of the optical signal measured by the optical wavelength measuring instrument 900 .

First, it is determined whether the wavelength adjustment is necessary.

4 is an example showing an optical signal of each channel received by the optical transceiver management apparatus 400 . The vertical axis of the drawing shows the set wavelength of each channel. When the central axis of the optical signal deviates from the preset wavelength by more than a predetermined range, the control unit 420 of the optical transceiver management apparatus 400 controls the wavelength of the signal that needs to be adjusted. to be judged as In the case of FIG. 4 , the wavelength of the optical signal of the second channel is shifted by W1 from the central axis, and it is determined as a signal requiring wavelength adjustment.

Next, a wavelength adjustment signal is generated.

When it is determined that the wavelength adjustment is necessary, the optical transceiver management apparatus 400 generates a wavelength adjustment signal containing wavelength adjustment information. The wavelength adjustment information may be, for example, information containing information for shifting a wavelength to a wavelength lower by W1 in the case of the second channel in FIG. 4 .

2.4. Wavelength adjustment signal transmission step

Transmitting the generated wavelength adjustment signal to the optical transceiver.

When the wavelength adjustment signal is transmitted to the optical transceiver multiplexed by the multiplexing device 800 , the wavelength tunable subcarrier is configured including the tunable transmitter 412 and the subcarrier transmitter 411 of the optical transceiver management device 400 . The transmitter 410 may transmit a wavelength adjustment signal with a wavelength set for the channel with respect to a channel requiring wavelength adjustment.

Such transmission of the wavelength adjustment signal may be transmitted in a guard time interval set between time intervals used for subcarrier transmission between optical transceivers as shown in FIG. 6 .

2.5. Wavelength adjustment step

The optical transceiver receiving the wavelength adjustment signal adjusts the wavelength of the generated optical signal. The sub-carrier receiving unit of the optical transceiver that has received the wavelength adjustment signal through the corresponding channel of the multiplexer 800 transmits it to the CPU (TRx), and the CPU (TRx) of the optical transceiver controls the wavelength adjustment unit, so that the optical transmitter adjusts the transmission wavelength. to adjust.

For example, as shown in FIG. 4, the optical transceiver that receives the wavelength adjustment signal to shift the wavelength of channel #2 by W1 like the second signal (channel #2) shifts the transmission wavelength down by W1, so that the optical transceiver The wavelength of the transmitted optical signal can be adjusted to a set wavelength.

On the other hand, the method of adjusting the wavelength of the optical transceiver using the optical transceiver management apparatus according to an embodiment of the present invention, the step of monitoring the wavelength of the optical signal using a measuring instrument, in the optical transceiver management device, the monitored optical signal selecting a channel requiring adjustment from among the wavelengths of , adjusting the output wavelength of the tunable subcarrier transmitter of the optical transceiver management device to the channel requiring adjustment, and transmitting wavelength adjustment information to the channel requiring adjustment may be included.

In other words, the wavelength adjustment information is CPU (tube transceiver management device) -> subcarrier transmitter (optical transceiver management device) -> optical splitter coupler -> optical receiver (optical transceiver) -> subcarrier bar receiver (TRx) -> CPU (TRx) sequence.

Meanwhile, the optical transceiver management apparatus may repeat the above-described process as many as the number of channels requiring wavelength adjustment.

Meanwhile, the optical transceiver may store the received wavelength adjustment information in a non-volatile memory and use it continuously.

Meanwhile, in the present invention, the optical transceiver management apparatus has been described only as adjusting the wavelength of the COT optical transceiver, but is not limited thereto, and the wavelength of the RT optical transceiver can be adjusted.

Specifically, it is possible to monitor the wavelength of the optical signal transmitted from the RT optical transceiver to the COT optical transceiver, and transmit wavelength adjustment information to the RT transceiver via the COT optical transceiver.

On the other hand, although the technical idea of the present invention has been described in detail according to the above embodiment, it should be noted that the above embodiment is for the description and not the limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical spirit of the present invention.

100, 700: host device
200, 300: optical transceiver
400: optical transceiver management device
500: optical transmission path
600: optical splitter
800: multiplexer
900: optical wavelength meter

Claims (9)

a first optical transceiver on the COT side;
a second optical transceiver on the RT side;
an optical transmission line for transmitting an optical signal between the first optical transceiver and the second optical transceiver;
an optical branch coupler for branching or combining optical signals from or to the optical transmission line;
an optical transceiver management device for transmitting and receiving optical signals through the optical transmission line through the optical splitter;
consists of,
The optical transceiver management device 400,
a subcarrier transmitter for transmitting wavelength adjustment information to the first optical transceiver and/or the second optical transceiver through the optical splitter coupler;
Optical communication network, characterized in that it comprises a. According to claim 1,
and a wavelength measuring instrument for generating wavelength information of the optical signal by measuring the wavelength of the optical signal branched from the optical transmission line through the optical splitter coupler;
The wavelength measuring device receives an optical signal from the optical splitter coupler, measures the wavelength, and transmits wavelength information of the measured wavelength to the optical transceiver management device 400, or
being included in the optical transceiver management device 400, receiving an optical signal from the optical splitter, measuring the wavelength, and transmitting the wavelength information to the control unit of the optical transceiver management device;
Optical communication network characterized by. 3. The method of claim 2,
The optical transceiver management device 400,
generating wavelength adjustment information based on the wavelength information derived by the wavelength measuring instrument, and transmitting it to the first and/or second optical transceiver by using the subcarrier transmitter of the optical transceiver management apparatus 400 by loading it on a subcarrier;
The first and/or the second optical transceiver receiving the wavelength adjustment information,
Having a subcarrier receiving unit and a wavelength adjusting unit,
receiving the wavelength adjustment information by the subcarrier receiving unit, and adjusting the wavelength of the optical signal generated by the optical transmitter in the wavelength adjusting unit accordingly;
Optical communication network characterized by. 4. The method of claim 3,
The optical transceiver management apparatus 400 generates a subcarrier on which the wavelength adjustment information is loaded as a wavelength adjustment signal having a predetermined first wavelength and transmits it to the optical transceiver,
The first and second optical transceivers are each provided in pairs of N or less,
and a COT-side and RT-side multiplexing device 800 for accommodating N channels, respectively, between the first and second optical transceivers and the optical transmission line,
The first and second optical transceivers are respectively connected to the input terminals of the COT side and the RT side multiplexer 800,
Each channel of the COT-side and RT-side multiplexing device 800 has different pass wavelengths, so that the wavelength control information signal having a first predetermined wavelength transmitted by the optical transceiver management device 400 is the first predetermined first wavelength. that the wavelength is transmitted only to the optical transceiver connected to the channel set to the pass wavelength;
Optical communication network characterized by. 5. The method of claim 4,
The multiplexing device is
Optical communication network, characterized in that it is a MUX/DeMUX or a periodic repetition type optical wavelength filter (Cyclic AWG). A method of adjusting the transmission wavelength of an optical transceiver connected through an optical transmission line, comprising:
an optical signal extraction step of branching and extracting the optical signal transmitted from the optical transceiver from the optical transmission line to the optical transceiver management apparatus 400 through an optical branch coupler;
an optical signal wavelength measuring step of measuring the wavelength of the optical signal by inputting the extracted optical signal to the optical wavelength measuring instrument 900;
a wavelength adjustment necessary determination step in which the optical transceiver management apparatus 400 determines whether wavelength adjustment is necessary from the measured wavelength information of the optical signal;
generating, by the optical transceiver management apparatus 400, a wavelength adjustment signal containing wavelength adjustment information when it is determined that wavelength adjustment is necessary;
a wavelength adjustment signal transmission step of transmitting the generated wavelength adjustment signal to the optical transceiver;
a wavelength adjustment step of adjusting the wavelength of the optical signal generated by the optical transceiver receiving the wavelength adjustment signal;
A method of adjusting the wavelength of an optical transceiver comprising a. A method of adjusting the transmission wavelength of an optical transceiver of multiple channels communicating with optical signals of different wavelengths through an optical transmission line and a multiplexing device 800 having a plurality of channels, the method comprising:
branching the optical signals transmitted from the plurality of optical transceivers from the optical transmission line to the optical transceiver management apparatus 400 through an optical branch coupler, and extracting optical signals from each channel;
an optical signal wavelength measuring step of measuring the wavelength of the optical signal by inputting the extracted optical signal to the optical wavelength measuring instrument 900;
a wavelength adjustment required channel identification step in which the optical transceiver management apparatus 400 identifies a wavelength adjustment required channel from the measured wavelength information of the optical signal;
generating, by the optical transceiver management apparatus 400, a wavelength adjustment signal containing wavelength adjustment information for the identified wavelength adjustment required channel;
a wavelength adjustment signal transmission step of loading the generated wavelength adjustment signal on a subcarrier having a wavelength of the preset channel and transmitting the transmitted to the optical transceiver;
a wavelength adjustment step of adjusting the wavelength of the optical signal generated by the optical transceiver receiving the wavelength adjustment signal;
A method of adjusting the wavelength of an optical transceiver comprising a. 8. The method of claim 6 or 7,
Transmission of the wavelength adjustment signal in the wavelength adjustment signal transmission step,
transmitting the optical transceiver in a guard time interval inserted between subcarriers in mutual subcarrier communication with another optical transceiver; A method of adjusting the wavelength of an optical transceiver, characterized in that. 8. The method of claim 7,
The multiplexing device having the plurality of channels,
A wavelength adjustment method of an optical transceiver, characterized in that it is a MUX/DeMUX or a periodic repetition type optical wavelength filter (Cyclic AWG).

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