KR20080004643A - Wavelength power meter - Google Patents

Abstract

An optical device for measuring wavelength and power is provided to easily extend multi-channels due to extension of wavelength band or high densification of wavelength division multiplexing. An optical device for measuring wavelength and power includes an input unit, a collimator, an optical unit(30), a light receiving unit(40), and an output unit(50). The input unit inputs a multi-wavelength optical signal. The collimator collimates the multi-wavelength optical signal input from the input unit. The optical unit filters a parallel light according to wavelength band. The light receiving unit receives the optical signal of each wavelength band filtered at the optical unit through an optical sensor(41). The output unit outputs wavelength and power corresponding to the optical signal received by the optical sensor of the light receiving unit.

Description

Wavelength Power Meter

1 is a view showing a conventional optical wavelength power meter.

2 is a view showing a schematic structure of a conventional optical power meter.

3 is a circuit diagram of a Mux element used in a conventional optical wavelength measuring instrument.

4 is a view showing a schematic structure of an optical wavelength power meter according to the present invention.

5 is a perspective view showing the appearance of an optical wavelength power meter according to the present invention.

Figure 6 is a perspective view showing the structure of the optical unit of the optical wavelength power meter according to the present invention.

7 is a side view showing the structure of the optical unit shown in FIG.

8 is a perspective view showing the structure of an optical unit of another form of the optical wavelength power meter according to the present invention;

9 is a side view showing the structure of the optical unit shown in FIG.

** Description of the symbols for the main parts of the drawings **

10: input 11: connector

20: collimator 30: optics

31: filter 32: rotating plate

33: step motor 34: rotation axis

40: light receiver 41: light sensor

42: collimator 50: output

51: display unit 52: selection switch

The present invention relates to an optical wavelength power meter, and more particularly, to an optical wavelength power meter for simultaneously measuring optical wavelength and power in an optical communication system or a mobile communication system.

As information and communication capacity increases exponentially, optical communication technology, which is the core of wired communication, is widely spreading from national backbone network to general subscriber network.

As the communication capacity becomes larger and higher in quality, the optical communication technology is changing into a high density multi-channel wavelength division multiplexed transmission technology.

At present, wavelength multiplexing is increasing from tens of channels to hundreds of channels, but we will establish FTTH (Fiber To The Home), which will be promoted nationwide from next year, It is predicted that optical communication transmission band will be extended to 1.7㎛ wavelength band.

As described above, the field of increasing importance as the optical wavelength band is expanded or the wavelength multiplexing is increased is the establishment of measurement standards and measurement technology related to optical communication.

Equipment for measuring the intensity of the light source, or optical power, is an optical power meter, which measures the optical power level and the loss value. It is used to make simple measurements. The measuring principle of the optical power is mainly measured by using photodiodes such as Ge, InGaAs, GaAs, etc. by converting the light intensity into an electrical signal.

The optical power meter can accurately measure the power of light, but there are various difficulties in simply measuring the optical power when installing and maintaining the optical subscriber network.

In particular, when the multiple wavelengths and the wavelength input to each subscriber are different, such as in the E / G-PON technology, WDM-PON technology, CWDM-PON technology, etc. The power meter cannot measure the exact optical power and does not know what wavelength is input. Therefore, it is necessary to know exactly the wavelength to be used, and it is necessary to know the power of the wavelength correctly. As such, since the optical power meter cannot measure the optical wavelength which is very important in the optical communication band, a separate equipment for measuring the optical wavelength or an apparatus capable of measuring the optical power and the wavelength should be used.

Optical Spectrum Analyzer is a device that can measure optical power and wavelength simultaneously. Optical wavelength analyzers are used to analyze the optical power and wavelength of multiplexed optical signals in a wavelength division multiplexing (WDM) system. The measuring principle of the optical wavelength analyzer confirms the optical wavelength by analyzing the spectrum passing through the grating period. The equipment for measuring the optical wavelength requires much more sophisticated optical technology and complicated process than the equipment for measuring the optical power, so the structure is complicated, bulky and weighty, power-consuming and shock-resistant, which can be used in the laboratory. It is only about. Therefore, there is a problem in that it is very inconvenient to measure the wavelength of the optical communication repeater installed mainly on the outdoor roof.

In order to improve such a problem, Korean Utility Model Publication No. 20-0385979 (Handheld Optical Wavelength Meter for CWDM Wavelength Measurement) has been disclosed.

As shown, an optical wavelength power meter is a light wavelength measurement and optical power measurement device for measuring optical power in an optical communication system, the CWDM optical filter 201 for dividing the wavelength component of the input optical signal, switching the multi-channel input information transmission The Mux element 202 includes an optical power measurement mechanism for amplifying a signal, performing A / D conversion, and outputting the signal after signal processing. In addition, the CWDM optical filter 201 divides the wavelength component of the input optical signal, and the 16- or 18-quarter low density wavelength division multiplexer (Coarse Wavelength Division Multiplexer), the multi-channel high-density wavelength division filter (Dense-WDM), etc. It will be produced using various commercially available filters.

2 is a view showing a schematic structure of the above-described optical wavelength power meter, Figure 3 is a circuit diagram of the Mux element 202 used here.

As illustrated, the input multi-wavelength optical signal is switched by the switching element for each wavelength band and the optical signal filtered for each wavelength band by the filter is output to each photodiode optical sensor through each coupler.

The mux element 202 requires a plurality of couplers 203 and a plurality of photodiode optical sensors 204 for outputting optical signals divided for each wavelength band. Therefore, since a large number of optical parts such as the coupler 203 and the optical sensor 204 are provided, there is a problem that the unit cost of the device is increased. In addition, these optical parts have a loss variation depending on the temperature, in particular, when the temperature deviation is large, such as summer and winter, there is a problem that the optical characteristic value can be changed, thereby reducing the reliability and optical characteristics. The biggest reason why the optical characteristic value varies with temperature deviation is that the loss of the optical package is caused by the complicated structure of the optical components as the number of channels increases and the optical components are required. As the optical components are provided in this way, the circuit is complicated and the more channels, the more the optical components are required and the size of the device is increased, which makes it difficult to increase the unit price and reduce the size. In addition, when the size of the device is limited, there is a problem that the channel expandability is not easy.

Therefore, the present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to enable the simultaneous measurement of each light wavelength and power in the optical signal input multiple wavelengths, as well as optical It is an optical wavelength power meter that can be miniaturized due to the small parts, low cost, and simple structure.

Another object of the present invention is to provide an optical wavelength power meter with little change in optical characteristic value due to temperature deviation in an optical package.

It is still another object of the present invention to provide an optical wavelength power meter that can be easily expanded in multiple channels according to the expansion of the optical wavelength band or the density of wavelength multiplexing.

In accordance with one aspect of the present invention, an optical wavelength power meter includes: an input unit to which an optical signal having a multi-wavelength is input; A collimator for collimating the multi-wavelength optical signal input from the input unit; An optical unit for filtering parallel light of multiple wavelengths collimated by the collimator for each single wavelength band; A light receiving unit for receiving an optical signal of each single wavelength band filtered by the optical unit by an optical sensor; An output unit for outputting an optical wavelength and an optical power corresponding to the optical signal received by the optical sensor of the light receiving unit; Characterized in that comprises a.

In addition, the optical unit of the present invention, a plurality of filters for filtering the parallel light of the multi-wavelength collimated in the collimator with each optical signal of a single wavelength band, the rotating plate is radially mounted on the disk and the rotating plate, the rotating plate It is characterized by consisting of a step motor for rotating the axis.

In addition, the light receiving unit of the present invention is characterized in that the collimator for collimating the light filtered by the filter is further provided to receive the collimated parallel light by the light sensor of the light receiving unit.

In addition, it is preferable that the light receiving unit of the present invention allows the optical sensor to directly receive the light filtered by the filter.

In addition, the output unit of the present invention is characterized in that it further comprises a display unit for quantizing and outputting the optical wavelength and optical power by the A / D converter.

In addition, the output unit of the present invention is characterized in that the selection switch for outputting the optical wavelength and the optical power at the same time or to the display unit is provided.

In addition, the input unit of the present invention is characterized in that the detachable connector is provided.

Hereinafter, an optical wavelength power meter according to the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

Figure 4 is a view showing a schematic structure of an optical wavelength power meter according to the present invention, Figure 5 is a perspective view showing the appearance of the optical wavelength power meter according to the present invention, Figure 6 is a structure of an optical unit of the optical wavelength power meter according to the present invention 7 is a side view showing the structure of the optical unit shown in Figure 6, Figure 8 is a perspective view showing the structure of an optical unit of another form of the optical wavelength power meter according to the present invention, Figure 9 is shown in Figure 8 It is a side view which shows the structure of the optical part.

As shown, the optical wavelength power meter according to the present invention includes an input unit 10 to which an optical signal of multiple wavelengths is input; A collimator 20 for collimating an optical signal of multiple wavelengths input from the input unit 10; An optical unit 30 for filtering the parallel light of multiple wavelengths for each single wavelength band; A light receiving unit 40 in which the filtered optical signal is received by the optical sensor; An output unit 50 for outputting an optical wavelength and an optical power corresponding to the received optical signal; It is made, including.

The input unit 10 receives an optical signal of multiple wavelengths from an optical source. The multi-wavelength optical signal input from the input unit 10 passes through the collimator 20. The input unit 10 is provided with a removable connector 11.

The collimator 20 collimates an optical signal of multiple wavelengths input from the input unit 10 to convert it into parallel light. The converted parallel light of the multiple wavelengths is moved to the optical unit 30.

The optical unit 30 filters the parallel light of the multi-wavelength collimated by the collimator 20 for each single wavelength band. The detailed structure of the optical unit 30 includes a plurality of filters 31, a rotating plate 32, and a step motor 33. The filter 31 serves to filter the parallel light of the multi-wavelength collimated by the collimator 20 into an optical signal of each single wavelength band, and the filter 31 is mounted to the rotating plate 32. . In this case, the filter 31 is provided to correspond to the number of channels. When the channel is expanded, the size of the rotating plate 32 may be increased and the number of the filters 31 may be easily expanded.

As described above, the present invention can facilitate the expansion of the channel, thereby enabling the expansion of the optical wavelength band and the high density of the wavelength multiplexing.

The rotating plate 32 is such that the filter 31 is radially mounted on the disc.

The step motor 33 serves to rotate by rotating the rotating plate 32 to the rotary shaft 34. In this case, the step motor 33 rotates the rotating plate 32 at a rotation angle corresponding to the number of channels, that is, an angle obtained by dividing one wheel by the number of channels. When the channel is extended, the rotating plate 32 may be rotated at a rotation angle corresponding to the number of channels. For example, in the case of 16 channels, the step motor 33 rotates the rotating plate 32 at a predetermined time interval at an angle of 22.5 kW (that is, 360 kW 16).

The light receiving unit 40 serves to receive an optical signal of each single wavelength band filtered by the optical unit 30 by the optical sensor 41. The light receiver 40 may further include a collimator 42 for collimating the light filtered by the filter to receive collimated parallel light by the light sensor 41 of the light receiver 40 (FIG. 6). And FIG. 7), the light sensor 41 may directly receive the light filtered by the filter 31 of the optical unit 30 (see FIGS. 8 and 9). As shown in FIGS. 8 and 9, when the optical sensor 41 directly receives the light filtered by the filter 31 of the optical unit 30, the parts of the collimator 42 are not used. Simpler.

The optical sensor 41 used in the present invention may be a photodiode mainly used for the optical sensor or another optical sensor. A photodiode is a semiconductor diode for converting an optical signal into an electrical signal. The photodiode is a photoelectric conversion device using an increase in a reverse current at a P-N junction due to photo-mechanical effects by irradiation of light. Accordingly, the optical signal received by the photodiode is digitized by the A / D converter to output the optical wavelength and the optical power. At this time, the optical sensor 41 is rotated by the rotating plate 32, the filter 31 is mounted by the rotation of the step motor 33 in the optical unit 30 by each filter to provide an optical signal of a single wavelength band Since it filters at regular intervals, one photodiode is used.

As described above, the present invention does not include a plurality of optical sensors so as to receive optical signals of each single wavelength band filtered as in the related art. In addition, the circuit can be simplified and the size of the module can be reduced. In addition, the present invention has the advantage that can improve the reliability and optical properties by improving the problem that the loss variation according to the temperature increases as the number of optical components increases as in the prior art.

The output unit 50 outputs an optical wavelength and an optical power corresponding to the optical signal received by the optical sensor 41 of the light receiving unit 40. In this case, the output unit 50 preferably further includes a display unit 51 for outputting the quantized light wavelength and optical power by an A / D converter (not shown). In addition, the output unit 50 preferably includes a selection switch 52 for simultaneously outputting or selecting and outputting the optical wavelength and the optical power to the display unit 51.

As described above, according to the present invention, the structure is not only indoors, but the structure is complicated, bulky and heavy, so that it is not possible to use it in the outdoor where most repeaters are installed. The optical wavelength and power can be measured, and the work time required for light measurement can be greatly reduced, and the work environment can be greatly improved. In addition, it requires less optical components, is inexpensive, has a simple structure, and can be miniaturized. It is possible to prevent deterioration in reliability and optical characteristics due to a small change due to temperature deviation in the optical package, and to reduce power consumption. There is little effect. In addition, the expansion of the multi-channel due to the expansion of the optical wavelength band and the densification of wavelength multiplexing is easy.

Claims (7)

In the optical wavelength power measuring device for measuring the optical wavelength and optical power of the optical communication system at the same time, An input unit to which an optical signal of multiple wavelengths is input; A collimator for collimating the multi-wavelength optical signal input from the input unit; An optical unit for filtering parallel light of multiple wavelengths collimated by the collimator for each single wavelength band; A light receiving unit for receiving an optical signal of each single wavelength band filtered by the optical unit by an optical sensor; An output unit for outputting an optical wavelength and an optical power corresponding to the optical signal received by the optical sensor of the light receiving unit; Optical wavelength power meter, characterized in that comprises a. The method of claim 1, The optical unit comprises a plurality of filters for filtering the parallel light collimated in the collimator by optical signals in each single wavelength band, a rotating plate on which the filter is radially mounted on the disc, and rotating the rotating plate by accumulating the rotating plate. An optical wavelength power meter comprising a step motor. The method of claim 2, The light receiving unit further comprises a collimator for collimating the light filtered by the filter so that the collimated parallel light is received by the light sensor of the light receiving unit. The method of claim 2, The light receiving unit of claim 1, wherein the optical sensor directly receives the light filtered by the filter. The method according to claim 3 or 4, The output unit further comprises a display unit for quantizing and outputting the optical wavelength and the optical power by the A / D converter. The method of claim 5, The output unit is an optical wavelength power meter, characterized in that the selection switch for outputting the optical wavelength and the optical power at the same time or the output to the display unit. 6. The optical wavelength power meter of claim 5, wherein the input unit is provided with a detachable connector.

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