KR100332501B1 - A Dropping and Adding Device of Optical Wavelength - Google Patents

Abstract

An optical wavelength extracting and adding device of the present invention includes an optical block for passing an optical signal of multiple wavelengths, an input collimator for focusing an input multiple wavelength optical signal and irradiating the focused optical signal to the optical block, and both sides of the optical block. A plurality of thin film filter sets each including a plurality of thin film filters zigzag and including a reflection filter for reflecting all incident multi-wavelength optical signals and a band pass filter for passing only signals having a specific wavelength band and reflecting the remaining signals. And a plurality of extraction collimators formed on the same optical axis as the optical signal incident on the filter set and focusing and extracting the optical signals passing through the plurality of thin film filter sets.

Such an optical wavelength extraction and addition device of the present invention can simultaneously extract and add multiple wavelengths with low manufacturing cost and small size.

Description

A Dropping and Adding Device of Optical Wavelength

FIELD OF THE INVENTION The present invention relates to optical wavelength extraction and addition devices, and more particularly to optical wavelength extraction and addition devices capable of simultaneously extracting and adding optical signals in multiple wavelength bands.

Optical wavelength extraction and addition devices are mainly used for optical signal transmission from the main optical transmission path of the two-way optical transmission system to the regional network and the regional ring network. That is, the light extraction and additional device extracts some wavelength signals of the optical signals transmitted through the optical transmission path such as the optical fiber from the region A (origin) to the region B (destination), for example, in the region C of the regional network of the region C. It is a device to use as a signal, add a signal of the same wavelength as the extracted wavelength signal and transmit it to the B region.

1 shows a conventional light extraction and addition apparatus.

As shown in FIG. 1, the conventional light extraction and addition apparatus passes through the collimators 11, 12, 13, and 14 for focusing incident light, and passes only the wavelength of a specific band of the incident light and rests the remaining band. The wavelength of is made of the interference thin film filter 20 to reflect.

In FIG. 1, the input collimator 11 focuses wavelengths λ1, λ2, λ3, ..., λn of multiple bands transmitted through the optical fiber and irradiates the thin film filter 20. The thin film filter 20 passes only the wavelength of λx among the irradiated multi-band wavelength signals and reflects the wavelengths of the remaining bands. The extraction collimator 12 is formed on the same optical axis as the input collimator 11, focuses the wavelength? X passing through the thin film filter 20, and transmits it to a local network or the like through the optical fiber.

The output collimator 13 receives and focuses a signal of a wavelength band reflected by the thin film filter 20 among the optical signals irradiated by the input collimator 11, and transmits the signal to a destination through an optical fiber. At this time, since the wavelength signal in the λx band passes through the thin film filter 20, the signal reflected by the thin film filter 20 is λ1, λ2, ..., λx-1 and λx + 1, ...., λn. Therefore, in order to transmit a signal of the same wavelength band as the signal input to the input collimator 11 from the output collimator 13 to the destination, a wavelength signal of the λx band must be added. The additional collimator 14 receives and focuses the signal? X having the same wavelength band as that of the optical signal extracted from the extraction collimator 12 through the optical fiber, and then irradiates the thin film filter 20 with the focused signal. Since the thin film filter 20 passes the optical signal in the λx band, the signal irradiated from the additional collimator 14 is received by the output collimator 13 through the thin film filter 20. Therefore, the signal focused by the output collimator 13 and transmitted to the destination becomes the same wavelength signal as the signal input to the input collimator 11.

However, the conventional optical wavelength extraction and addition apparatus shown in FIG. 1 can extract only an optical signal having only one wavelength band, and thus can be used when using an optical signal having two or more wavelength bands in a local network. There is a problem that can not be.

Figure 2 shows a conventional variable wavelength extraction and addition apparatus.

As shown in FIG. 2, the conventional variable wavelength extraction and addition apparatus includes a demultiplexer 30, a multiplexer 40, and a 2x2 switch set 50. As shown in FIG.

The demultiplexer 30 separates multiple band optical signals λ1 to λn inputted through optical fibers into wavelength signals of respective bands, and transmits the separated signals through n optical fibers. The multiplexer 40 synthesizes optical signals having different wavelength bands respectively input through n optical fibers, and transmits the synthesized optical signals to the destination through the optical fibers.

The 2x2 switch set 50 is composed of n 2x2 switches that connect each wavelength signal received from the demultiplexer 30 to one of an optical fiber connected to the multiplexer 40 and an optical fiber connected to the local network 60.

As shown in FIG. 3B, the 2 × 2 switch is configured to connect the terminal 1 of the optical fiber connected to the demultiplexer 30 to the extraction terminal 3 of the local network 60 or the terminal 2 of the optical fiber connected to the multiplexer 40. Switch (S2) connecting the additional terminal (4) of the local network (60) and the switch (S1) connected to the terminal (2) of the optical fiber connected to the extraction terminal (3) or multiplexer (40) of the local network (60) ).

Like the 2 × 2 switch SW1 of FIG. 3A, the switch S1 connects the terminal 1 of the optical fiber connected to the demultiplexer 30 to the terminal 2 of the optical fiber connected to the multiplexer 40, and the switch S2 is connected to a local area. When the additional terminal 4 of the network is connected to the extraction terminal 3 of the local network 60, the optical signal λ 1 transmitted from the demultiplexer 30 through the optical fiber is transmitted to the local network 60. Without being directly transmitted to the multiplexer 40 through the optical fiber.

Meanwhile, like the 2 × 2 switch SW2 of FIG. 3A, the switch S1 connects the terminal 1 of the optical fiber connected to the demultiplexer 30 to the extraction terminal 3 of the local network 60, and the switch S2 is When the additional terminal 4 of the local network is connected to the terminal 2 of the optical fiber connected to the multiplexer 40, the optical signal λ 2 transmitted from the demultiplexer 30 through the optical fiber is extracted from the local network 60. The optical signal λ 2 extracted through the terminal 3 to the local network 60 and added through the additional terminal 4 of the local network is transmitted to the multiplexer 40 through the optical fiber. As such, the conventional variable wavelength extraction and addition apparatus can simultaneously extract and add multiple wavelengths by switching operation of a 2x2 switch.

However, the conventional variable wavelength extraction and addition device has a problem of increasing the size of the device because it consists of multiple devices such as a multiplexer, a demultiplexer, and a 2x2 switch set, and also has an expensive multiplexer, a demultiplexer, and a 2x2 switch set. There was a problem that the manufacturing cost increases because of use.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve such a problem, and to provide an optical wavelength extraction and additional device capable of simultaneously extracting and adding multiple wavelengths as one device.

1 shows a conventional single wavelength light extraction and addition apparatus.

2 shows a conventional variable wavelength light extraction and addition apparatus.

3A and 3B are diagrams illustrating the 2x2 switch block of FIG.

4 is a diagram showing an optical wavelength extraction and addition apparatus according to a first embodiment of the present invention.

FIG. 5 is a diagram illustrating an example of the optical block of FIG. 4.

FIG. 6 is a detailed view of the thin film filter set of FIG.

7 is a view showing an optical wavelength extraction and additional device according to a second embodiment of the present invention.

Optical wavelength extraction and additional device according to one feature of the present invention for achieving the above object

An optical block for passing an optical signal of multiple wavelengths; An input collimator configured to focus the input multi-wavelength optical signal and irradiate the focused optical signal to the first surface of the optical block; Zigzags are formed on the first or second surface of the optical block, and the reflection filter reflects all incident multi-wavelength optical signals and the band pass filter passes only signals having a specific wavelength band and reflects the remaining signals. A plurality of thin film filter sets comprising; A plurality of additional collimators each formed on the same optical axis as the optical signals reflected from the plurality of thin film filter sets and focusing the same signal as the optical signals passing through the plurality of thin film filter sets and irradiating the thin film filter sets; An output collimator for focusing and outputting an optical signal reflected by the plurality of thin film filter sets and an optical signal added by the additional collimator and an optical signal incident on the plurality of thin film filter sets, respectively, And a plurality of extraction collimators for focusing and extracting optical signals passing through the plurality of thin film filter sets.

Here, the thin film filter set may be automatically or manually moved to select a reflection or transmission of an incident optical signal by being positioned on an optical path to which either the reflective filter or a specific band pass filter is incident.

In addition, the optical block may form a hole in the metal or ceramic body to transmit an optical signal through the hole.

On the other hand, the optical wavelength extraction and additional device according to another feature of the present invention

First and second optical blocks for passing optical signals of multiple wavelengths; A first input collimator for focusing the input multi-wavelength optical signal and irradiating the focused optical signal to the first surface of the first optical block; A broadband pass filter formed on a second surface of the first optical block and transmitting a signal having a specific broadband wavelength among the optical signals of multiple wavelengths input from the first input collimator and reflecting a signal of the remaining band; A second input collimator for focusing an optical signal having a specific broadband wavelength passing through the broadband pass filter and irradiating the focused optical signal to a first surface of the second optical block; It is formed on the first surface or the second surface of the first optical block, and passes only a signal having a specific wavelength band and a reflection filter that reflects all the optical signals reflected from the broadband pass filter and reflects the remaining signals A plurality of first thin film filter sets comprising band pass filters; A plurality of first extraction collimators each formed on the same optical axis as the optical signals incident on the plurality of first thin film filter sets, and focusing and extracting the optical signals passing through the plurality of first thin film filter sets; A band formed on a first surface or a second surface of the second optical block, the reflection filter reflecting all optical signals emitted from the second input collimator, and a band passing only a signal having a specific wavelength band and reflecting the remaining signals A plurality of second thin film filter sets comprising a pass filter; And a plurality of second extraction collimators each formed on the same optical axis as the optical signals incident on the plurality of second thin film filter sets, and focusing and extracting the optical signals passing through the plurality of second thin film filter sets. .

In addition, the light wavelength extraction and additional device

The optical signals reflected from the plurality of first thin film filter sets are respectively formed on the same optical axis, and the same signals as the optical signals passing through the plurality of first thin film filter sets are focused and irradiated to the first thin film filter sets. A plurality of first additional collimators; a first output collimator configured to focus and output the optical signals reflected by the plurality of first thin film filter sets and the optical signals added by the first additional collimators; The optical signals reflected from the plurality of second thin film filter sets are formed on the same optical axis, and the same signals as the optical signals passing through the plurality of second thin film filter sets are focused and irradiated to the second thin film filter sets. A plurality of second additional collimators; And a second output collimator configured to focus and output the optical signal reflected by the plurality of second thin film filter sets and the optical signal added by the second additional collimator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram showing an optical wavelength extraction and addition apparatus according to a first embodiment of the present invention.

As shown in FIG. 4, the apparatus for extracting and adding the wavelength of light according to the first embodiment of the present invention includes an input collimator Pin, an output collimator Pout, an extraction collimator DP1, DP2, ..., DPn, and the like. Collimators AP1, AP2, ..., APn, optical block 100 and thin film filter sets F1, F2, ..., Fn.

The input collimator Pin focuses the wavelengths λ 1, λ 2, λ 3,..., Λ n of the multiple bands transmitted through the optical fiber and transmits them to the optical block 100.

The optical block 100 transmits the light incident through the input collimator Pin or the light reflected by the thin film filter set without loss. As the optical block 100, a material having a low light loss such as glass or the like may be used. As shown in FIG. 5, a hole (slot) 110 is formed in the metal or ceramic body 100 to form a slot. The optical signal may be transmitted.

The thin film filter set is provided on both sides of the optical block 100 so as to coincide with the optical axis of the incident light. 4 and 5, thin film filter sets F1, F3, F5, ..., Fn-1 are formed on one side of the optical block 100, and the thin film filter on the other side. Sets F2, F4, ..., Fn are formed.

As shown in Fig. 6, these thin film filter sets have a reflection filter (Fx-1) that reflects all wavelengths and a bandpass filter (Fx-2) that selectively transmits only a specific wavelength (for example, λx) and reflects the remaining wavelengths. )

Each filter in these thin-film filter sets can be moved manually and automatically using solenoids, electromagnets, small motors, etc., and the user can manually and move these filters to position them on the optical path to You can choose. At this time, when automatically selecting each filter of the thin film filter set, a switch driver (not shown) for selecting a filter of the thin film filter set is separately installed. The extraction collimators DP1, DP2, ... DPn focus the wavelength signals λ1, λ2, ... λn transmitted through the thin film filter sets F1, F2, ..., Fn, respectively, Send to a network or the like.

The additional collimators AP1, AP2, ..., APn respectively receive signals λ1, λ2, ... λn of the same wavelength band as the optical signals extracted from the extraction collimators DP1, DP2, ..., DPn. After receiving and focusing through the optical fiber and the optical collimator, the focused signal is irradiated to the thin film filter set (F1, F2, ..., Fn).

The output collimator (Pout) receives and focuses an optical signal irradiated through the additional collimator and a signal of the wavelength band reflected from all the thin film filter sets among the optical signals irradiated by the input collimator (Pin), and then through the optical fiber to the destination send.

The following describes the operation of the optical wavelength extraction and addition apparatus according to the first embodiment of the present invention.

First, the case where the filters of all the thin film filter sets are selected as the reflective filters (that is, the reflective filters are placed on the optical path) will be described.

The wavelengths λ 1, λ 2, λ 3,..., Λ n of the multiple bands incident through the input collimator Pin are irradiated to the thin film filter set F1 through the optical block 100. At this time, since the thin film filter set F1 is selected as the reflective filter, all the wavelengths irradiated to the reflective filter are reflected and irradiated to the thin film filter set F2 through the optical block 100. Similarly, since the thin film filter set F2 is selected as the reflective filter, all the wavelengths irradiated on the thin film filter set F2 are also reflected, and this operation is similarly performed in other thin film filter sets. As a result, the light input through the input collimator Pin is reflected by all thin film filter sets and output through the output collimator Pout.

Next, the thin film filter set Fx is set as a band pass filter and the remaining thin film filter set is set as a reflection filter.

As described above, the wavelengths λ1, λ2, λ3, ..., λn of the multiple bands incident through the input collimator Pin are determined by the thin film filter sets F1, F2, ..., Fx-1. After being reflected in turn, the thin film filter set Fx is irradiated. In this case, since the thin film filter set Fx is set as a band pass filter that transmits only an optical signal having a wavelength of λx band, the thin film filter set Fx transmits only λx to the extraction collimator DPx and transmits the remaining band. The signals [lambda] 1, ..., [lambda] x-1, [lambda] x + 1, ..., [lambda] n) are reflected.

The signals λ1, ..., λx-1, λx + 1, ..., λn reflected by the thin film filter set Fx are reflected in the thin film filter set Fx + 1, ..., Fn in turn. Then, it is output through the output collimator (Pout). In this case, the signal output through the output collimator Pout is removed, so that the signal of the λx band is removed, so that a signal having the same wavelength band as the signal input to the input collimator Pin can be transmitted from the output collimator Pout to the destination. It is necessary to add a wavelength signal in the λx band. Therefore, after receiving and converging a signal λx having the same wavelength band as the optical signal extracted from the extraction collimator DPx through the additional collimator APx through the optical fiber, the focused signal is irradiated onto the thin film filter set Fx. do.

Meanwhile, in order to extract wavelength signals in the λy band other than λx among the incident multiband signal components, the thin film filter set Fx and the thin film filter set Fy are set as band pass filters, and the remaining thin film filters are reflected. You can set it with a filter. In this case, in order to irradiate the output collimator Pout with the same signal incident to the input collimator Pin, the additional collimator APx and the additional collimator APy are irradiated with wavelength signals in the λx and λy bands, respectively. The thin film filter set Fx and the thin film filter set Fy may be irradiated.

As described above, according to the first embodiment of the present invention, the wavelength signal of the desired band can be extracted by appropriately selecting the filter of the thin film filter set as the reflection filter or the band pass filter. In this case, when the wavelength signal to be the same as the extracted wavelength signal is transmitted to the thin film filter set through the additional collimator, the same signal as the signal of the wavelength incident on the input collimator may be output to the output collimator.

Next, an optical wavelength extraction and additional device according to a second embodiment of the present invention will be described with reference to FIG.

7 is a view showing an optical wavelength extraction and additional device according to a second embodiment of the present invention.

As shown in FIG. 7, the apparatus for extracting and adding wavelengths according to the second embodiment of the present invention includes a first input collimator Pin1, a first output collimator Pout1, a first extraction collimator Dx + 1, and a first apparatus. 1 additional collimator (APx + 1), first optical block 210 and first thin film filter set (Fx + 1, Fx + 2, ...., Fn), broadband pass filter (BF), second input Collimator (Pin2), second output collimator (Pout2), second extraction collimator (D1), second additional collimator (AP1), second optical block 220 and second thin film filter set (F1, F2, ... ., Fx).

In FIG. 7, only one first and second extraction collimator and one first and third additional collimator are shown for convenience, but are actually provided corresponding to each thin film filter set as shown in FIG. 7. Among the components according to the second embodiment of the present invention, the same components as the first embodiment of the present invention have the same operation, and overlapping descriptions are omitted.

In the second embodiment of the present invention, the wide band pass filter (BF) serves to pass a wide band signal among the input multi-band signals. For example, in FIG. 7, the optical band pass filter BF includes? 1, λ2, ..., among the input multi-band signal components λ1, λ2, ..., λx, λx + 1 ... λn. Only wavelength signals in the λx band are passed and the remaining signals (λx + 1, λx + 2, ...., λn) are reflected.

The following describes the operation of the optical wavelength extraction and addition apparatus according to the second embodiment of the present invention.

The wavelengths λ 1, λ 2, λ 3,..., Λ n of the multiple bands incident through the first input collimator Pin1 are irradiated to the optical band pass filter BF through the first optical block 210. Of the optical signals irradiated to the broadband filter BF, wavelength signals of the λ1, λ2,..., Λx bands are passed through, received by the second input collimator Pin2 and focused, and then the second optical block 220 is moved. Through the thin film filter set F1, the remaining signals? X + 1,? X + 2, ...,? N are reflected and irradiated to the thin film filter set Fx + 1.

These signals λx + 1, λx + 2, ...., λn are reflected or transmitted by the filter selection of the thin film filter set Fx + 1, Fx + 2, ..., Fn, so that the first output collimator Pout1 Is printed through). In this case, when a wavelength signal of a specific band is selected by the filter selection of the thin film filter set (for example, Fx + 2) and extracted through the extraction collimator, the same signal λx + 2 as the extracted wavelength signal is added to the additional collimator. Through the thin film filter set (Fx + 2).

Similarly, the signals λ 1, λ 2,..., Λ x passing through the optical band pass filter BF are reflected or transmitted by the filter selection of the thin film filter sets F 1, F 2,. Output through the collimator (Pout2). Also in this case, when a wavelength signal of a specific band is selected by the filter selection of the thin film filter set and extracted through the extraction collimator, the same signal as the extracted wavelength signal is irradiated onto the thin film filter set through the additional collimator.

Since the operation of the optical wavelength addition and extraction apparatus according to the second embodiment of the present invention other than the above-described optical wavelength addition and extraction apparatus of the first embodiment of the present invention can be easily understood by those skilled in the art related to the present invention. Is omitted.

The optical wavelength extracting and adding device according to the second embodiment of the present invention divides the input wavelength into two wide bands using a wide band pass filter, and then extracts and adds an optical signal for each wide band signal. Therefore, there is an advantage that the number of thin film filter sets and extraction (addition) collimators formed in one optical filter can be reduced.

As mentioned above, although embodiment of this invention was described, this invention is not limited only to the above-mentioned embodiment, Of course, other various changes and changes are possible, of course.

For example, in the second embodiment of the present invention, one wide band pass filter and two optical blocks are used. In addition, n wide band pass filters and n + 1 optical blocks may be used.

In addition, in the first and second embodiments of the present invention, a thin film filter set, extraction, and additional collimator are formed on both sides of the optical block, but on one side, a filter for reflecting all incident optical signals is formed and the other Thin film filter sets, extractions, and additional collimators may also be formed on the face only.

As described above, the present invention can provide an optical wavelength extraction and additional device capable of simultaneously extracting and adding multiple wavelengths at low manufacturing cost and small size.

Claims (7)

(Correction) an optical block for passing an optical signal of multiple wavelengths; An input collimator configured to focus the input multi-wavelength optical signal and irradiate the focused optical signal to the first surface of the optical block; Zigzags are formed on the first or second surface of the optical block, and the reflection filter reflects all incident multi-wavelength optical signals and the band pass filter passes only signals having a specific wavelength band and reflects the remaining signals. A plurality of thin film filter sets comprising; A plurality of additional collimators each formed on the same optical axis as the optical signals reflected from the plurality of thin film filter sets and focusing the same signal as the optical signals passing through the plurality of thin film filter sets and irradiating the thin film filter sets; An output collimator for focusing and outputting the optical signal reflected by the plurality of thin film filter sets and the optical signal added by the additional collimator; And And a plurality of extraction collimators each formed on the same optical axis as the optical signals incident on the plurality of thin film filter sets, and focusing and extracting the optical signals passing through the plurality of thin film filter sets. (delete) (delete) (Correction) The method according to claim 1, The thin film filter set may be automatically or manually moved to select optical reflection or transmission of an incident optical signal by being positioned on an optical path upon which either the reflective filter or a specific band pass filter is incident. Additional devices. The method of claim 4, wherein The optical block is And a hole formed in the metal or ceramic body to transmit an optical signal through the hole. First and second optical blocks for passing optical signals of multiple wavelengths; A first input collimator for focusing the input multi-wavelength optical signal and irradiating the focused optical signal to the first surface of the first optical block; A broadband pass filter formed on a second surface of the first optical block and configured to transmit a signal having a specific broadband wavelength among the multi-wavelength optical signals input from the first input collimator and reflect the signal of the remaining band; A second input collimator for focusing an optical signal having a specific broadband wavelength passing through the broadband pass filter and irradiating the focused optical signal to a first surface of the second optical block; It is formed on the first surface or the second surface of the first optical block, and passes only a signal having a specific wavelength band and a reflection filter that reflects all the optical signals reflected from the broadband pass filter and reflects the remaining signals A plurality of first thin film filter sets comprising band pass filters; A plurality of first extraction collimators each formed on the same optical axis as the optical signals incident on the plurality of first thin film filter sets, and focusing and extracting the optical signals passing through the plurality of first thin film filter sets; A band formed on a first surface or a second surface of the second optical block, the reflection filter reflecting all optical signals emitted from the second input collimator, and a band passing only a signal having a specific wavelength band and reflecting the remaining signals A plurality of second thin film filter sets comprising a pass filter; And The light includes a plurality of second extraction collimators, each of which is formed on the same optical axis as the optical signals incident on the plurality of second thin film filter sets, and focuses and extracts the optical signals passing through the plurality of second thin film filter sets. Wavelength extraction and additional devices. The method of claim 6, The optical signals reflected from the plurality of first thin film filter sets are respectively formed on the same optical axis, and the same signals as the optical signals passing through the plurality of first thin film filter sets are focused and irradiated to the first thin film filter sets. A plurality of first additional collimators; A first output collimator for focusing and outputting an optical signal reflected by the plurality of first thin film filter sets and an optical signal added by the first additional collimator; The optical signals reflected from the plurality of second thin film filter sets are formed on the same optical axis, and the same signals as the optical signals passing through the plurality of second thin film filter sets are focused and irradiated to the second thin film filter sets. A plurality of second additional collimators; And And a second output collimator for focusing and outputting the optical signal reflected by the plurality of second thin film filter sets and the optical signal added by the second additional collimator.