KR101471066B1 - Optical signal strength Measuring device using Reflection. - Google Patents

Abstract

The present invention relates to a device for analyzing a wavelength and intensity with reflection and, more specifically, to a device for analyzing a wavelength and intensity with reflection capable of integrating a filter and a photodiode in an optical conversion unit having a collimator; analyzing the intensity of incident and reflected optical signals; and accurately extracting the intensity and the optical wavelength of the optical signals.

Description

TECHNICAL FIELD [0001] The present invention relates to a wavelength and intensity analyzing apparatus using reflection.

The present invention relates to a wavelength and intensity analyzing apparatus using reflection, and more particularly, to a wavelength and intensity analyzing apparatus using reflection to integrate a filter and a photodiode in a photoelectric conversion unit including a collimator therein, And more particularly, to a wavelength and intensity analyzing apparatus using reflection to extract an optical signal intensity and an optical wavelength more precisely than the conventional method.

Due to the rapid expansion of the Internet, data traffic has been rapidly increasing due to the rapid increase in data services, and various types of networks have emerged to accommodate them.

From this point of view, recently, the use of the communication environment for meeting the surging data traffic and the super-high-speed communication has been increasing by transmitting and receiving the optical signal type data through the optical line, and the use of such communication environment is expected to be further increased in the future.

Particularly, an important communication medium in optical communication is an optical cable.

Even if it is a good equipment, if only one of hundreds of kilometers is cut off, billions of equipment is completely useless.

Therefore, in order to maintain a normal communication state, it has been developed as a system for automatically detecting the status of a cable using a monitoring device for an optical cable and a point at which a problem occurs.

In particular, telecommunication companies with domestic and overseas optical cables have been using portable power meters to measure signal quality through optical lines.

In particular, with the launch of LTE mobile communication services, optical transmission lines are widely deployed, with base stations being downsized and optical cables departing from underground and indoor areas to outdoor steel towers.

Due to this service environment, optical cable network line operators are demanding simple, light and low cost power meters.

As shown in FIG. 1, the conventional analyzing apparatus uses a 50: 50 analyzer using an analyzer.

That is, the optical power input to the input stage is divided by the 50:50 divider.

Then, a signal incident on the PD 1 is transmitted through a linear filter, photoelectrically converted by a photodiode, which is a photoelectric conversion element, and converted into an electrical signal, and a signal incident on the PD 2 is photoelectrically converted by a photodiode Signal.

At this time, as shown in FIG. 2, the PD1 analyzes the optical signal transmitted through the linear filter with a difference of loss by signal, so that the adjacent signal analysis is not accurate and the accuracy is poor.

Further, as shown in FIG. 3, the PD 2 has a problem that the power due to the 50:50 distributor is attenuated and the reception sensitivity is lowered.

Therefore, a technique for improving the accuracy and improving the reception sensitivity is required.

none.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

It is an object of the present invention to integrate a filter and a photodiode in a photoelectric conversion unit including a collimator therein to analyze intensity of an input / .

It is another object of the present invention to provide a configuration in which reflection of an optical signal is directly input to a photodiode through a collimator in a free space, thereby minimizing loss compared to the conventional method.

Another object of the present invention is to extract the wavelength information of the first PD and the second PD because the difference between the digital values of the first PD and the second PD is larger than that of the conventional method, .

In order to achieve the object of the present invention,

According to an embodiment of the present invention, there is provided an apparatus for analyzing wavelength and intensity using reflection,

An input unit 100 for connecting to an optical fiber;

A first cylindrical body 210,

A first connection part 220 formed inside the first cylindrical body and connected to the input part,

A second optical fiber collimator for providing the optical signal reflected from the linear filter unit to the half-stage optical fiber 230, and a second optical fiber collimator for providing the optical signal reflected by the linear filter unit to the half- (240)

A linear filter unit 250 formed inside the first cylindrical body to be spaced apart from the dual optical fiber collimator by a predetermined distance and providing an optical signal transmitted through the dual optical fiber collimator to the first PD,

A first photoelectric conversion unit 200 including a first PD 260 for converting an optical signal provided by the linear filter unit into an electrical signal,

A second cylindrical body 310,

A second connection part 320 connected to the half-stage optical fiber 230,

A single optical fiber collimator 330 for providing a reflected optical signal, which is formed inside the second cylindrical body and input through the second connection unit, to the second PD,

And a second PD 340 for converting an optical signal provided through the single optical fiber collimator into an electrical signal, the second PD 340 being spaced apart from the single optical fiber collimator by a predetermined distance in the second cylindrical body, (500) comprising photoelectric conversion means (300);

An analog switching unit 600 for receiving a current value transmitted from the first PD and the second PD at an intersection;

And a central processing unit 700 for obtaining a current value sent by the first PD and the second PD and converting the current value into a digital value and measuring the wavelength and intensity of the wavelength using the digital value. .

The apparatus for analyzing wavelength and intensity using reflection according to the present invention comprises:

It is possible to integrate a filter and a photodiode in a photoelectric conversion unit including a collimator in the interior thereof and to analyze intensity of an input and reflected optical signal to provide an effect of accurately extracting input optical signal intensity and optical wavelength, do.

In addition, by providing a configuration in which the light is reflected by the optical signal and input directly to the photodiode through the collimator in the free space, loss can be minimized compared to the conventional method, and the size and weight of the optical line To provide on-site personnel with convenient, inexpensive, on-site maintenance and monitoring.

In addition, since the extraction is performed by the intensity of the transmitted and reflected signals of the filter rather than the wavelength extraction method of the conventional method, the difference between the digital values of the first PD and the second PD becomes larger, so that accurate wavelength information can be extracted.

FIG. 1 is a diagram illustrating optical signal wavelength and power analysis in the conventional analysis method of the present invention.
2 is a graph showing optical signals and power in PD1 of the conventional analysis method of the present invention.
3 is a graph showing optical signals and power in PD2 of the conventional analysis method of the present invention.
4 is a configuration diagram of a wavelength and intensity analyzing apparatus using reflection according to an embodiment of the present invention.
5 is a configuration diagram of photoelectric conversion means of an apparatus for analyzing wavelength and intensity using reflection according to an embodiment of the present invention.
6 is a graph showing optical signals and power in the PD 1 of the apparatus for analyzing wavelength and intensity using reflection according to an embodiment of the present invention.
7 is a graph of optical signals and power in the PD 2 of the apparatus for analyzing wavelength and intensity using reflection according to an embodiment of the present invention.
8 is a block diagram of a central processing unit of an apparatus for analyzing wavelength and intensity using reflection according to an embodiment of the present invention.
9 is a graph of data obtained by acquiring the received signal of the first PD during the time t1 and acquiring the received signal of the second PD during the time t2.
FIG. 10 is an exemplary table of current values, digital values, and intensity values measured by PD1 and PD2.
11 is an exemplary table for analyzing the measured values of PD1 and PD2 and analyzing the wavelengths accordingly.

According to an aspect of the present invention, there is provided an apparatus for analyzing wavelength and intensity using reflection,

An input unit 100 for connecting to an optical fiber;

A first cylindrical body 210,

A first connection part 220 formed inside the first cylindrical body and connected to the input part,

A second optical fiber collimator for providing the optical signal reflected from the linear filter unit to the half-stage optical fiber 230, and a second optical fiber collimator for providing the optical signal reflected by the linear filter unit to the half- (240)

A linear filter unit 250 formed inside the first cylindrical body to be spaced apart from the dual optical fiber collimator by a predetermined distance and providing an optical signal transmitted through the dual optical fiber collimator to the first PD,

A first photoelectric conversion unit 200 including a first PD 260 for converting an optical signal provided by the linear filter unit into an electrical signal,

A second cylindrical body 310,

A second connection part 320 connected to the half-stage optical fiber 230,

A single optical fiber collimator 330 for providing a reflected optical signal, which is formed inside the second cylindrical body and input through the second connection unit, to the second PD,

And a second PD 340 for converting an optical signal provided through the single optical fiber collimator into an electrical signal, the second PD 340 being spaced apart from the single optical fiber collimator by a predetermined distance in the second cylindrical body, (500) comprising photoelectric conversion means (300);

An analog switching unit 600 for receiving a current value transmitted from the first PD and the second PD at an intersection;

And a central processing unit 700 for acquiring a current value sent by the first PD and the second PD and converting the current value into a digital value and measuring the intensity of the wavelength and the wavelength using the digital value .

At this time, the central processing unit (700)

A digital converter 710 for converting the current values received by the analog switching unit into digital values,

Acquiring a digital value of the first PD converted by the digital conversion unit, referring to the memory unit, extracting intensity values corresponding to the digital value,

A central controller 720 for calculating the difference between the digital values by acquiring the digital values of the first PD and the second PD converted by the digital converter and extracting the wavelength information corresponding to the calculated difference in the memory from the memory,

And a memory unit 730 for storing intensity value information for the current value and wavelength information for each gap value.

At this time, in the first PD 260 and the second PD 340,

A specific intensity value is input for each signal and the processed result value is stored in the memory unit to analyze the light intensity value.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a wavelength and intensity analyzing apparatus using reflection according to the present invention will be described in detail.

4 is a configuration diagram of a wavelength and intensity analyzing apparatus using reflection according to an embodiment of the present invention.

As shown in FIG. 4, the apparatus for analyzing wavelength and intensity using reflection according to the present invention includes an input unit 100 for connecting with an optical fiber; A photoelectric conversion unit 500 including a first photoelectric conversion unit 200 and a second photoelectric conversion unit 300; An analog switching unit 600; And a central processing unit (700).

The apparatus of the present invention as described above is a wavelength / optical power analyzer that integrates an optical filter and respective photodiodes corresponding thereto to extract optical signal intensity and optical wavelength inputted from the conventional method more accurately.

The above-described Wavelength / Optical Power analyzer performs the same function as the optical converter used in the WDM network, the existing optical repeater, and the optical characteristic meter, and has the characteristics of minimizing the size and excellent insertion loss characteristics.

5 is a configuration diagram of photoelectric conversion means of an apparatus for analyzing wavelength and intensity using reflection according to an embodiment of the present invention.

The photoelectric conversion means (500)

A first cylindrical body 210,

A first connection part 220 formed inside the first cylindrical body and connected to the input part,

A second optical fiber collimator for providing the optical signal reflected from the linear filter unit to the half-stage optical fiber 230, and a second optical fiber collimator for providing the optical signal reflected by the linear filter unit to the half- (240)

A linear filter unit 250 formed inside the first cylindrical body to be spaced apart from the dual optical fiber collimator by a predetermined distance and providing an optical signal transmitted through the dual optical fiber collimator to the first PD,

A first photoelectric conversion unit 200 including a first PD 260 for converting an optical signal provided by the linear filter unit into an electrical signal,

A second cylindrical body 310,

A second connection part 320 connected to the half-stage optical fiber 230,

A single optical fiber collimator 330 for providing a reflected optical signal, which is formed inside the second cylindrical body and input through the second connection unit, to the second PD,

And a second PD 340 for converting an optical signal provided through the single optical fiber collimator into an electrical signal, the second PD 340 being spaced apart from the single optical fiber collimator by a predetermined distance in the second cylindrical body, (300).

Specifically, the first photoelectric conversion portion 200 includes a first cylindrical body 210,

A first connection part 220 formed inside the first cylindrical body and connected to the input part,

A second optical fiber collimator for providing the optical signal reflected from the linear filter unit to the half-stage optical fiber 230, and a second optical fiber collimator for providing the optical signal reflected by the linear filter unit to the half- (240)

A linear filter unit 250 formed inside the first cylindrical body to be spaced apart from the dual optical fiber collimator by a predetermined distance and providing an optical signal transmitted through the dual optical fiber collimator to the first PD,

And a first PD 260 for converting the optical signal provided by the linear filter unit into an electrical signal.

A first connection part 220 connected to the input part is formed in the first cylindrical body 210 and a dual optical fiber collimator 240 is formed.

The dual optical fiber collimator is an optical lens for providing an optical signal input through the first connection unit to the linear filter unit and providing the optical signal reflected by the linear filter unit to the half-stage optical fiber 230.

The term " dual optical fiber " means two optical fibers such as a first connection part and a half-duplex optical fiber.

Since the wavelength division and wavelength intensity must be distinguished from each other, the present invention is subjected to a filtering process.

Accordingly, the linear filter unit 250 is configured to linearly increase the size of the output signal in accordance with an increase in the number of wavelengths of the input optical signal.

The linear filter unit 250 is formed within the first cylindrical body so as to be spaced apart from the dual optical fiber collimator by a predetermined distance, and provides the optical signal transmitted through the dual optical fiber collimator to the first PD.

At this time, the first PD 260 converts the optical signal provided by the linear filter unit into an electrical signal.

The second photoelectric conversion unit 300 includes a second cylindrical body 310,

A second connection part 320 connected to the half-stage optical fiber 230,

A single optical fiber collimator 330 for providing a reflected optical signal, which is formed inside the second cylindrical body and input through the second connection unit, to the second PD,

And a second PD 340 that is spaced apart from the single optical fiber collimator by a predetermined distance in the second cylindrical body and converts an optical signal provided through the single optical fiber collimator into an electrical signal.

That is, the optical signal is transmitted through the second connection unit 320 to the reflection-end optical fiber 230, and the reflected optical signal is received.

The single optical fiber collimator 330 is formed inside the second cylindrical body and provides the reflected optical signal inputted through the second connection part to the second PD.

At this time, the second PD 340 is spaced apart from the single optical fiber collimator by a predetermined distance in the second cylindrical body, and the optical signal provided through the single optical fiber collimator is converted into an electrical signal.

If only the light intensity is measured, only the first PD can be configured, but if the wavelength is measured, the first PD and the second PD are required.

In summary, the optical signal inputted to the input unit passes through the dual optical fiber collimator and becomes parallel light, so that the optical signal transmitted through the linear filter according to the characteristics of the linear filter is directly inputted to the photodiode (first PD) .

In addition, the optical signal reflected by the linear filter returns and is output to the connected half-wave optical fiber.

The advantage of this structure is that the optical signal transmitted through the linear filter is directly input to the photodiode through the lens in the free space. The size of the photodiode can be reduced, and the volume used is smaller than that of the conventional case, It can be said that it is big.

In addition, since the optical signal is transmitted and reflected and photoelectrically converted into the first PD and the second PD to analyze the power intensity of the first PD signal and the power intensity difference value of the second PD signal, the power level range is widened, Effect.

Meanwhile, the first PD 260 may be configured to input a specific intensity value for each signal and to store the processed result value in the memory unit to analyze the light intensity value. Accordingly, the effect of improving the reception sensitivity can be incidentally provided will be.

FIG. 6 is a graph of the optical signal and power output of the first PD, and FIG. 7 is a graph of the optical signal and power output of the second PD.

As shown in FIGS. 6 to 7, the power intensity of the first PD signal and the power intensity difference value of the second PD signal are widened, thereby enabling accurate analysis.

At this time, the central processing unit 700 obtains a current value sent by the first PD and the second PD, converts the current value into a digital value, and measures the wavelength and the intensity of the wavelength using the digital value.

8 is a block diagram of a central processing unit of an apparatus for analyzing wavelength and intensity using reflection according to an embodiment of the present invention.

That is, the central processing unit 700,

A digital converter 710 for converting the current values received by the analog switching unit into digital values,

Acquiring a digital value of the first PD converted by the digital conversion unit, referring to the memory unit, extracting intensity values corresponding to the digital value,

A central controller 720 for calculating the difference between the digital values by acquiring the digital values of the first PD and the second PD converted by the digital converter and extracting the wavelength information corresponding to the calculated difference in the memory from the memory,

And a memory unit 730 for storing intensity value information for the current value and wavelength information for each gap value.

Meanwhile, the analog switching unit 600 of the present invention performs a function of receiving current values transmitted from the first PD and the second PD at an intersection.

As shown in Fig. 9, the first PD receive signal is acquired during the time t1, and the second PD receive signal is acquired during the time t2.

That is, the reception signals of the first PD and the second PD are received in a crossing manner under the control of the central control unit before being processed by the digital conversion unit.

At this time, the digital conversion unit 710 converts the current values received by the analog switching unit into digital values.

Meanwhile, the central controller 720 obtains the digital value of the first PD converted by the digital converter, extracts the intensity value corresponding to the digital value with reference to the memory,

The digital value of the first PD and the second PD converted by the digital conversion unit is calculated to calculate the difference of the digital values and the wavelength information corresponding to the difference of the calculated digital values is extracted from the memory unit.

At this time, the memory unit 730 stores intensity value information for the current value and wavelength information for the gap difference.

10 to 11, the digital value corresponding to the current value is extracted by referring to the memory unit, and the intensity value corresponding thereto is extracted.

For example, when the current value of the first PD is 10 mA, the digital value is 10, the intensity value is -7 dBm,

When the current value of the second PD is 15 mA, the digital value is 11 and the intensity value is -4 dBm.

In this case, as shown in FIG. 11, the difference of the extracted intensity values is defined as | Δ│ = | PD 1 - PD 2 |, which is calculated by 3 dB as | Δ | = | -7 - (-4) do.

Thereafter, the wavelength corresponding to 3 dB stored in the memory unit is extracted at 1270 nm.

Thus, it is possible to confirm which wavelength the wavelength is.

Also, the intensity is calculated by extracting the intensity value corresponding to the current value transmitted from the first PD from the memory unit.

As described above, since the intensity value information and the wavelength information are stored in the memory part, the wavelength and intensity can be analyzed.

In the case of improving the optical power reception sensitivity, the reception sensitivity is improved because the optical signal and optical power reflected from the linear filter are directly supplied without using the conventional 50:50 splitter.

In the case of improving the optical signal analysis precision, the difference between the first PD and the optical signal reflected from the first PD and the optical power reflected from the linear filter is analyzed by the second PD, It is possible to analyze the optical signal more accurately than the method of analyzing with the optical signal and optical power.

It will be appreciated by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is to be understood, therefore, that the embodiments described above are to be considered in all respects as illustrative and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Input unit
200: a first photoelectric conversion section
300: a second photoelectric conversion section
500: photoelectric conversion means
600: analog switching section
700: central processing unit

Claims (3)

A wavelength and intensity analyzer comprising:
An input unit 100 for connecting to an optical fiber;
A first cylindrical body 210,
A first connection part 220 formed inside the first cylindrical body and connected to the input part,
A second optical fiber collimator for providing the optical signal reflected from the linear filter unit to the half-stage optical fiber 230, and a second optical fiber collimator for providing the optical signal reflected by the linear filter unit to the half- (240)
A linear filter unit 250 formed inside the first cylindrical body to be spaced apart from the dual optical fiber collimator by a predetermined distance and providing an optical signal transmitted through the dual optical fiber collimator to the first PD,
A first photoelectric conversion unit 200 including a first PD 260 for converting an optical signal provided by the linear filter unit into an electrical signal,
A second cylindrical body 310,
A second connection part 320 connected to the half-stage optical fiber 230,
A single optical fiber collimator 330 for providing a reflected optical signal, which is formed inside the second cylindrical body and input through the second connection unit, to the second PD,
And a second PD 340 for converting an optical signal provided through the single optical fiber collimator into an electrical signal, the second PD 340 being spaced apart from the single optical fiber collimator by a predetermined distance in the second cylindrical body, (500) comprising photoelectric conversion means (300);
An analog switching unit 600 for receiving a current value transmitted from the first PD and the second PD at an intersection;
And a central processing unit 700 for obtaining a current value sent by the first PD and the second PD and converting the current value into a digital value and measuring the intensity of the wavelength and the wavelength using the digital value. An apparatus for analyzing wavelength and intensity using reflection.
The method according to claim 1,
The central processing unit (700)
A digital converter 710 for converting the current values received by the analog switching unit into digital values,
Acquiring a digital value of the first PD converted by the digital conversion unit, referring to the memory unit, extracting intensity values corresponding to the digital value,
A central controller 720 for calculating the difference between the digital values by acquiring the digital values of the first PD and the second PD converted by the digital converter and extracting the wavelength information corresponding to the calculated difference in the memory from the memory,
And a memory unit 730 for storing intensity value information for the current value and wavelength information for the gap difference.
The method according to claim 1,
In the first PD 260 and the second PD 340,
Wherein a specific intensity value is input for each signal and the processed result value is stored in a memory unit to analyze the light intensity value.

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