KR20130009134A - Optical package and erbium-doped fiber amplifier using the same - Google Patents

Abstract

PURPOSE: An optical package device and an erbium doped optical fiber amplifier using the same are provided to reduce the loss due to splicing by decreasing splicing points by applying efficient package type configuration. CONSTITUTION: An EDFA(100) includes a first optical package device(110), an erbium doped optical fiber(13) and a second optical package device(120). A first tap coupler filter, a first photodiode, a first isolator, a first wavelength division multiplexer and a first pump laser diode are modulized in the first optical package device. A second tap coupler filter, a second photodiode, a second isolator, a second wavelength division multiplexer and a second pump laser diode are modulized in the second optical package device. The erbium doped optical fiber amplifies optical signal by energy provided through pumped light received from the first optical package.

Description

OPTICAL PACKAGE AND ERBIUM-DOPED FIBER AMPLIFIER USING THE SAME

The present invention relates to an optical package device and an erbium-doped optical fiber amplifier using the same.

The optical fiber amplifier is an apparatus for transmitting an optical signal in a wavelength division multiplexing (WDM) method. In recent years, a lot of research is being conducted around EDFA (Erbium-Doped Fiber Amplify) devices, and as the traffic volume increases rapidly, more channels are required, thereby increasing the demand for improving the performance of broadband fiber amplifiers. There is a situation.

Such optical fiber amplifiers are used as key components for high density WDM optical communication systems and network construction due to their high bandwidth and low noise figure. On the other hand, since the price is very high, it is necessary to develop a low-cost, high-efficiency integrated optical amplifier that will be required to build a high-speed national network.

1 shows a configuration example of a conventional EDFA.

Conventional erbium-doped fiber amplifiers (hereinafter referred to as "EDFA") periodically amplify the optical signal to prevent attenuation of the optical signal due to the long-distance transmission when a large amount of data is transmitted over the input and output optical fiber. For reference, the 'x' mark p in FIG. 1 represents a splicing point.

As shown in FIG. 1, the EDFA includes Erbium Doped Fiber (EDF) 10 for amplifying an optical signal. One end of the erbium-doped optical fiber 10 is connected to a pump laser diode 11 that outputs pumped light to the wavelength division multiplexer 12.

In addition, the wavelength division multiplexer (WDM) 12 combines the pumped light received from the pump laser diode 11 and the optical signal of the input optical fiber 18 and transmits the optical signal to the erbium-doped optical fiber 10.

In addition, an isolator 13 and a tap coupler filter 14 are interposed between the other end of the erbium-doped optical fiber 10 and the output optical fiber 19 to monitor the operation of the EDFA or to prevent the advancing of the optical signal. Here, the tap coupler filter 14 branches a part of the optical signal and transfers it to the photodiode 15.

However, the EDFA configuration of FIG. 1 may cause splicing loss due to splicing. In addition, insertion loss may occur in the optical fiber when an additional device is inserted.

Thus, EDFA structures in the form of hybrid integrated modules have been proposed that reduce splicing losses and package individual optical devices.

For example, a package portion in the form of a conventional hybrid integrated module includes a pump reject filter, a tap coupler filter, and an isolator for removing residual pump power at an input port. In addition, an integrated fiber amplifier module (IFAM) form or an improved form of the IFAM form a package part in which a pump laser diode is added to the hybrid integrated module.

However, in the conventional hybrid EDFA structure, various optical components are integrated into a relatively large and expensive package. And, although the number of optical components integrated in one package has increased, the shape of the packaged module has become more complicated, thereby raising the problem of reliability and productivity in performing the functions of the EDFA.

One object of the present invention is to provide an erbium-doped fiber amplifier that provides a plurality of optical components in the form of a compact and inexpensive package to improve the productivity and performance of EDFA.

In addition, an embodiment of the present invention is to provide an erbium-doped fiber amplifier to reduce the splice loss by reducing the splicing point in an efficient package configuration.

According to the present invention for achieving the above object, a first lens for parallel projection of the optical signal received from the input optical fiber; A tap coupler filter which transmits the optical signal projected through the first lens to the isolator and branches the optical signal; A photodiode for sensing the branched optical signal; An isolator for fixing the flow direction of the optical signal received from the tap coupler filter; A pump laser diode for generating pumped light; A wavelength division multiplexer for coupling the pumped light and the optical signal passing through the isolator, and a second lens for projecting the optical signal in which the pumped light is coupled in parallel to an output optical fiber, wherein the input optical fiber and the output optical fiber Are spaced apart from each other, and the first lens, the tap coupler filter, and the photodiode are sequentially disposed along the same central axis as the input optical fiber, and the second lens, the wavelength division multiplexer, and the pump laser diode are Sequentially arranged along the same central axis as the output optical fiber, and the isolator is disposed between the tap coupler filter and the wavelength division multiplexer and is arranged along an imaginary straight line connecting the tap coupler filter and the wavelength division multiplexer. Provide a package device.

The display device may further include a housing configured to store the first lens, the tap coupler filter, the isolator, the wavelength division multiplexer, the second lens, the photodiode, and the pump laser diode.

The housing includes: a body housing containing the tap coupler filter, the isolator, and the wavelength division multiplexer; A first housing in which the photodiode is stored and coupled to one end of the body housing in a direction crossing the longitudinal direction of the body housing; And a second housing having the pump laser diode stored therein and coupled to the other end of the body housing in a direction crossing the longitudinal direction of the body housing so as to face the first housing.

A third lens may be interposed between the wavelength division multiplexer and the pump laser diode to project the pump light received from the pump laser diode in parallel to the wavelength division multiplexer.

An optical package device comprising: a first lens for projecting an optical signal received from an input optical fiber in parallel; A pump laser diode for generating pumped light; A wavelength division multiplexer for coupling the pumped light and the optical signal passing through the first lens; An isolator for fixing a flow direction of the optical signal projected through the first lens; A tap coupler filter for branching a portion of the optical signal passing through the isolator; A photodiode for sensing an optical signal branched through the tap coupler filter; And a second lens for projecting an optical signal passing through the tap coupler filter in parallel to an output optical fiber, wherein the input optical fiber and the output optical fiber are spaced apart from each other and arranged side by side, and the first lens, the wavelength division multiplexer, and the A pump laser diode is sequentially disposed along the same central axis as the input optical fiber, the second lens, the tap coupler filter and the photodiode are sequentially disposed along the same central axis as the output optical fiber, and the isolator divides the wavelength. An optical package device is disposed between a multiplexer and the tap coupler filter, and is disposed along an imaginary straight line connecting the tap coupler filter and the wavelength division multiplexer. The display device may further include a housing configured to store the first lens, the tap coupler filter, the isolator, the wavelength division multiplexer, the second lens, the photodiode, and the pump laser diode.

The housing includes: a body housing containing the tap coupler filter, the isolator, and the wavelength division multiplexer; A first housing in which the pump laser diode is stored and coupled to one end of the body housing in a direction crossing the longitudinal direction of the body housing; And a second housing coupled to the other end of the body housing in a direction crossing the longitudinal direction of the body housing so as to face the first housing when the photodiode is stored.

And a fourth lens interposed between the wavelength division multiplexer and the pump laser diode to project the pumped light received from the pump laser diode in parallel to the wavelength division multiplexer.

The input optical fiber and the output optical fiber may be opposed to each other in the same direction.

The housing may include: a third housing containing the input optical fiber and connected to the body housing in a direction opposite to the first housing; And a fourth housing for storing the output optical fiber and connected to the body housing in a direction opposite to the second housing.

The body housing, the first housing and the second housing may have a U-shaped shape.

The housing may have a shape of H shape.

Further, an erbium-doped optical fiber amplifier, comprising: a first optical package device corresponding to the configuration of claim 1; An erbium-doped optical fiber having one end coupled to an output optical fiber of the first optical package device; And a second optical package device corresponding to the configuration of claim 5 in which the other end of the erbium-doped optical fiber and the input optical fiber are combined.

According to the above-described problem solving means of the present invention, by providing a plurality of optical components in the form of a compact, low-cost package it is possible to improve the productivity of EDFA and the reliability of performing the function.

In addition, according to the above-described problem solving means of the present invention, it is possible to reduce the splicing point by reducing the splicing point in an efficient package configuration.

1 shows a configuration example of a conventional EDFA.
2 shows a configuration example of an EDFA.
3A and 3B are block diagrams illustrating the structure of an EDFA according to an embodiment of the present invention.
4A and 4B show a detailed structure of an optical package device according to an embodiment of the present invention.
5A and 5B show a detailed structure of an optical package device according to an embodiment of the present invention.
6 illustrates a form in which a connector is connected to an EDFA according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

2 shows a configuration example of an EDFA.

As shown in FIG. 2, the EDFA (erbium-doped fiber amplifier) includes a first tap coupler filter 51, a first photodiode 52, and a first isolator 53 disposed at one end of the erbium-doped optical fiber 60. And a first pump laser diode 54 and a first wavelength division multiplexer 55. The EDFA also includes a second pump laser diode 71, a second wavelength division multiplexer 72, a second isolator 73, a second tap coupler filter 74, and a second disposed at the other end of the erbium-doped optical fiber 60. A photodiode 75. For reference, the 'x' mark p in the drawing indicates a splicing point. Hereinafter, the components of each EDFA will be described in detail.

The first tap coupler filter 51 transmits the optical signal input through the input optical fiber a 'to the first isolator 53, branching a part of the optical signal to the first photodiode 52, and splitting the remaining optical signal. It passes to the first isolator 53. Here, the first photodiode 52 senses the branched optical signal. The optical signal sensed by the first photodiode 52 may be input to a control means (not shown), and the control means may control a current applied to the first pump laser diode 54 based on the optical signal. .

The first isolator 53 fixes the flow direction of the optical signal to prevent the reverse direction of the optical signal. That is, the first isolator 53 prevents a phenomenon in which the optical signal traveling in the reverse direction among the output lights by the ASE (Amplified Spontaneous Emission) of the erbium-doped optical fiber 60 is reflected by other photons to reduce amplification efficiency. This prevents unnecessary reverse travel of the optical signal.

The first wavelength division multiplexer 55 splits and combines the pumped light received from the first pump laser diode 54 and the optical signal received from the first isolator 53 and transmits them to the erbium-doped optical fiber 60. do. More specifically, the first wavelength division multiplexer 55 combines an optical signal of 1530 nm to 1560 nm wavelength and pumped light of 980 nm to be incident on the erbium-doped optical fiber 60 through the first isolator 53 on the input side. Can be.

Here, the first pump laser diode 54 is an active optical device that provides energy required to excite erbium, and delivers pumping light for amplifying an optical signal to the first wavelength division multiplexer 55. For example, the center wavelength of the pumped light output from the first pump laser diode 54 may be, for example, 980 nm, which is combined with the optical signal described above by the first wavelength division multiplexer 55 to erbium-doped optical fiber 60. Is delivered.

The erbium-doped optical fiber 60 amplifies the pumped light and the optical signal received from the first wavelength division multiplexer 55. For example, the erbium-doped optical fiber 60 generates an amplified optical signal by amplifying an optical signal having a wavelength of 1550 nm from the energy provided by the 980 nm pumped light.

The second wavelength division multiplexer 72 transmits the pumped light received from the second pump laser diode 71 to the erbium-doped optical fiber 60.

The second isolator 73 prevents the optical signal from traveling backward to the erbium-doped optical fiber 60 to prevent the gain reduction caused by the reflected wave.

The second tap coupler filter 74 outputs the optical signal received from the second isolator 73 to the output optical fiber b ', but splits a part of the optical signal and transfers the optical signal to the second photodiode 75. Here, the second photodiode 75 senses the branched optical signal.

3A and 3B will be described in detail with respect to the structure of the EDFA packaged as an example in FIG. 2 described above.

3A and 3B are block diagrams illustrating the structure of an EDFA according to an embodiment of the present invention.

As shown in FIGS. 3A and 3B, the EDFA 100 of the present invention includes a first optical package device 110, an erbium-doped optical fiber 130, and a second optical package device 120. This simplified and efficient configuration reduces the splicing point p, thereby reducing splicing losses due to splicing.

More specifically, the first tap coupler filter 51, the first photodiode 52, the first isolator 53, and the first wavelength division multiplexer 55 disposed at one end of the erbium-doped optical fiber 60 of FIG. 2 described above. And the first pump laser diode 54 are modularized into the first optical package device 110.

The second tap coupler filter 74, the second photodiode 75, the second isolator 73, the second wavelength division multiplexer 72, and the second pump laser disposed at the other end of the erbium-doped optical fiber 60. Diode 71 is modularized into second optical package device 120.

Here, the first optical package device 110 receives an optical signal from the input optical fiber a ₁ , combines the optical signal with the generated pumping light, and transmits the optical signal to the erbium-doped optical fiber 130. The first optical package device 110 transmits the optical signal transmitted from the input optical fiber a ₁ to the first optical package device 110 and the erbium-doped optical fiber 130 from the first optical package device 110. It comprises a plurality of lenses (lens) for the optical signal is projected.

The erbium-doped optical fiber 130 amplifies the optical signal. That is, the erbium-doped optical fiber 130 amplifies the optical signal by the energy provided by the pumping light received from the first optical package device 110.

The second optical package device 120 transmits the amplified optical signal received from the erbium-doped optical fiber 130 to the output optical fiber b ₂ . In addition, the second optical package device 120, the optical signal transmitted from the erbium-doped optical fiber 130 to the second optical package device 120 and the optical signal transmitted from the output side package portion 120 to the output optical fiber (b ₂ ). It includes a plurality of lenses to allow the call to be projected.

Meanwhile, the first optical package 110 and the second optical package 120 may be disposed to face each other as shown in FIG. 3B.

Hereinafter, the detailed structure of the optical package apparatus will be described in detail with reference to FIGS. 4 and 5. 4A and 4B show detailed structures of the first optical package device and the second optical package device according to an embodiment of the present invention, and FIGS. 5A and 5B illustrate a structure according to an embodiment of the present invention. The perspective view of a 1st optical package apparatus and a 2nd optical package apparatus is shown.

Subsequently, as shown in FIG. 4A, the first optical package apparatus 110 may include a first lens L1, a first tap coupler filter 112, a first photodiode 113, and a first isolator 114. ), A first wavelength division multiplexer 115, a second lens L2, and a first pump laser diode 116, but may further include a third lens L3.

Here, the first lens L1, the first tap coupler filter 112, and the first photodiode 113 are sequentially disposed along the same central axis as the input optical fiber a ₁ , and the second lens L2, the first lens The first wavelength division multiplexer 115 and the first pump laser diode 116 are sequentially disposed along the same central axis as the output optical fiber a ₂ , and the first isolator 114 is formed with the first tap coupler filter 112 and the first tap coupler filter 112. Disposed between one wavelength division multiplexer 115.

In this case, the first isolator 114, the first tap coupler filter 112, and the first wavelength division multiplexer 115 intersect the central axis of the input optical fiber a 'and the central axis of the output optical fiber b'. And arranged vertically as in this embodiment.

4B, the second optical package 120 includes a fourth lens L4, a second wavelength division multiplexer 122, a fifth lens L5, a second pump laser diode 123, and a first lens. And a second isolator 124, a second tap coupler filter 125, and a second photodiode 126, and may further include a sixth lens L6.

The fourth lens L4, the fifth lens L5, and the sixth lens L6 of the second optical package 120 may include the first lens L1 and the second lens L2 of the first optical package 110. And the same lens as the third lens L3.

Here, the fourth lens L4, the second wavelength division multiplexer 122, and the second pump laser diode 123 are sequentially disposed along the same central axis as the input optical fiber b ₁ , and the fifth lens L5, The second tap coupler filter 125 and the second photodiode 126 are sequentially disposed along the same central axis as the output optical fiber b ₂ , and the second isolator 124 is formed of the second wavelength division multiplexer 122 and the second wavelength coupler 122. Disposed between the two tap coupler filter 125.

In this case, like the first optical package 110 described above, the second isolator 124, the first wavelength division multiplexer 122, and the second tap coupler filter 125 may have a central axis and an output of the input optical fiber a ′. It is arrange | positioned in the direction which cross | intersects the central axis of the optical fiber b '.

Meanwhile, as shown in FIGS. 5A and 5B, the optical package apparatus 110 and 120 may include the lenses L1 to L6, the tap coupler filters 112 and 125, the isolators 114 and 124, and the wavelength division multiplexer 115. 122, housings 110 ′ and 120 ′ containing photo diodes 113 and 126 and pump laser diodes 116 and 123, respectively.

First, referring to FIG. 5A, the housing 110 'includes a body housing 110'a, a first housing 110'b and a second housing 110'c, and a first housing 110. 'b) and the second housing 110'c are connected in a direction crossing the longitudinal direction of the body housing 110'a at one end and the other end of the body housing 110'a, wherein the first housing 110 'b) and the second housing 110'c are connected to face in the same direction.

Accordingly, the shape in which the body housing 110'a, the first housing 110'b, and the second housing 110'c are connected has a U shape, and the entire housing 110 'is H shaped. Will have the shape of.

The body housing 110 ′ a houses the tab coupler filter 112, the isolator 114, and the wavelength division multiplexer 115 of the optical package device 110.

The first housing 110 ′ b of the housing 110 ′ shown in FIG. 5A houses the first photodiode 113, and the second housing 110 ′ c contains the first pump laser diode 116. do.

On the other hand, the housing 110 ′ and the third housing 110 ′ d which stores a portion of the input optical fiber a ₁ and are connected to the body housing 110 ′ a in a direction opposite to the first housing 110 ′ b. And a fourth housing 110'e that stores a portion of the output optical fiber a ₂ and is connected to the body housing 110'a in a direction opposite to the second housing 110'c.

As described above, the third housing 110'd and the fourth housing 110'e are provided to store a part of the input optical fiber a ₁ and the output optical fiber a ₂ , but the input optical fiber a _{1 is provided.} ) And the third housing 110'd and the fourth housing 110'e for storing the output optical fiber a ₂ may be omitted.

5B illustrates another embodiment of the housing 120 ′. Referring to FIG. 5B, the housing 120 ′ may include a body housing 120 ′ a, a first housing 120 ′ b and a second housing 120 ′. A housing 120'c, and the first housing 120'b and the second housing 120'c extend in the longitudinal direction of the body housing 120'a at one end and the other end of the body housing 120'a. The first housing 120'b and the second housing 120'c are connected to face in the same direction.

Accordingly, the shape in which the body housing 120'a, the first housing 120'b, and the second housing 120'c are connected has a U shape, and the entire housing 120 'is H shaped. Will have the shape of.

The body housing 120 ′ a houses the tab coupler filter 124, the isolator 124, and the wavelength division multiplexer 122 of the optical package device 120.

The first housing 120 ′ b of the housing 120 ′ shown in FIG. 5B houses the first photodiode 113, and the second housing 120 ′ c houses the first pump laser diode 123. do.

On the other hand, the housing 120 'and a third housing 120'd which stores a part of the input optical fiber b ₁ and connected to the body housing 120'a in a direction opposite to the first housing 120'b. And a fourth housing 120'e for storing a portion of the output optical fiber b ₂ and connected to the body housing 120'a in a direction opposite to the second housing 120'c.

As described above, the third housing 120'd and the fourth housing 120'e are provided to store a part of the input optical fiber b ₁ and the output optical fiber b ₂ , but the input optical fiber b _{1 is included.} ) And the third housing 120'd and the fourth housing 120'e for storing the output optical fiber b ₂ may be omitted.

The role of each component included in the optical package apparatus 110 or 120 as described above will be described in detail as follows.

First, the lenses L1 to L6 included in the first optical package apparatus 110 and the second optical package apparatus 120 project the received optical signals.

The lenses L1 to L6 may be implemented as GRIN (graded-index) lenses having a planar or spherical shape having a refractive index distribution along the radial direction on the optical axis. However, the present invention is not limited thereto, and various aspherical lenses (eg, C-lenses) or the like may be used to project the optical signal.

The tap coupler filters 112 and 125 included in the first optical package device 110 and the second optical package device 120 branch a part of the optical signal, and the isolators 114 and 124 adjust the flow direction of the signal. It is fixed to prevent the reverse direction of the optical signal.

The pump laser diodes 116 and 123 generate pumping light, and each of the photodiodes 113 and 126 senses the branched optical signal.

Hereinafter, an operation process of the optical package apparatus 110 or 120 will be described in more detail.

First, the first lens L1 disperses an optical signal received from the input optical fiber a ₁ and projects the optical signal to the first tap coupler filter 112.

In addition, the first tap coupler filter 112 transmits the incident optical signal to the first isolator 114, and branches a part of the optical signal to the first photodiode 113. The branched optical signal is transmitted to the photodiode 113b through the transparent window 113a of the first photodiode 113. For reference, the transparent windows 113a, 116a, 123a, and 126a may project and detect an optical signal or pumped light.

The first isolator 114 prevents the reverse direction of the optical signal, and fixes the flow direction of the optical signal received from the first tap coupler filter 112 and transmits it to the first wavelength division multiplexer 115.

Here, the first wavelength division multiplexer 115 couples the optical signal to the pumping light received from the first pump laser diode 116 and transmits the optical signal to the second lens L2.

More specifically, the above-described first pump laser diode 116 transfers the pumping light generated by the pump laser diode 116b to the third lens L3 through the transparent window 116a, and the third lens L3. Is transmitted in parallel to the first wavelength division multiplexer 115.

Then, the first wavelength division multiplexer 115 combines the pumped light with the optical signal passing through the first isolator 114 and transmits the light signal to the second lens L2.

Meanwhile, the erbium-doped optical fiber 130 amplifies and transmits the optical signal incident by the second lens L2 to the output side package unit 120. For example, the erbium-doped optical fiber 130 amplifies an optical signal having a wavelength of 1550 nm from energy provided by the 980 nm pumping light and transmits the optical signal to the second optical package unit 120.

Next, the fourth lens L4 of the second optical package unit 120 receives the amplified optical signal and distributes and projects the amplified optical signal to the second wavelength division multiplexer 122.

The second wavelength division multiplexer 122 transfers the pumped light received from the second pump laser diode 123 to the erbium-doped optical fiber 130.

Here, the second pump laser diode 123 transfers the pumping light generated by the pump laser diode 123b to the sixth lens L6 through the transparent window 123a. Then, the sixth lens L6 projects the pumped light in parallel to the second wavelength division multiplexer 122.

The second isolator 124 fixes the flow direction of the optical signal received from the erbium-doped optical fiber 130 and transfers it to the second tap coupler filter 125.

The second tap coupler filter 125 branches a portion of the optical signal that has passed through the second isolator to the second photodiode 126. Here, the second tap coupler filter 125 may monitor the output power of the EDFA 100. The branched optical signal is transmitted to the photodiode 126b through the transparent window 126a of the second photodiode 126.

The remaining non-branched optical signal is collected through the fifth lens L5 and transmitted to the output optical fiber b ₂ .

Meanwhile, according to the configuration of the optical components disposed at the other end of the erbium-doped optical fiber 60 of FIG. 2 described above in another embodiment, the second optical package unit 120 may include the fourth lens L4 and the second isolator ( 124, the second tap coupler filter 125, the second photodiode 126, and the fifth lens L5.

In this case, the fourth lens L4 distributes and projects the optical signal received from the erbium-doped optical fiber, and the second isolator 124 fixes the flow direction of the optical signal received from the erbium-doped optical fiber 130.

In addition, the second tap coupler filter 125 transmits the optical signal passing through the second isolator 124 to the fifth lens L5 while branching a part of the optical signal to the second photodiode 126.

The second photodiode 126 senses the branched optical signal, and the fifth lens L5 condenses and projects the optical signal received from the second tap coupler filter 125 onto the output optical fiber b '. do.

In addition, according to the configuration of the optical components disposed at one end of the erbium-doped optical fiber 60 of FIG. 2 described above in another embodiment, the first optical package unit 110 may include the first lens L1 and the first tab. The coupler filter 112, the first photodiode 113, the first isolator 114, and the second lens L2 may be formed.

In this case, the first lens L1 distributes and projects the optical signal received from the input optical fiber a ₁ . The first tap coupler filter 112 transfers the projected optical signal to the first isolator 114, and branches a part of the optical signal to the first photodiode 113.

In addition, the first photodiode 113 senses the branched optical signal, the first isolator 114 fixes the flow direction of the optical signal received from the first tap coupler filter 112, and the second lens L2. ) Condenses and projects the optical signal passing through the first isolator 114 to the erbium-doped optical fiber 130.

Hereinafter, a form in which the connector 200 is connected to the EDFA 100 of the present invention will be described with reference to FIG. 6.

6 illustrates a form in which a connector is connected to an EDFA according to an embodiment of the present invention.

The EDFA 100 of the present invention described above includes a first optical package portion and a second optical package portion 110 and 120 at one end and the other end of the erbium-doped optical fiber 130 and the erbium-doped optical fiber 130, It is configured as a low-cost package that can be arranged to increase the efficiency of optical signal transmission by placing a plurality of lenses in each package.

Therefore, as shown in FIG. 6, the connector 200 of the external device can be easily connected to the EDFA 100 due to the simplified EDFA 100 structure of the present invention. This reduces splicing losses due to splicing.

In addition, through a simplified and efficient structure composed of the first and second optical packages 110 and 120 and the erbium-doped optical fiber 130, the reliability of the EDFA 100 may be improved and performance may be improved. In addition, of course, the first optical package unit 110 and the second optical package unit 120 described above may be modularized into one package unit.

On the other hand, the above description of the present invention is for the purpose of illustration, and those skilled in the art to which the present invention pertains that it can be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. Could be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

And the scope of the present invention is represented 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 equivalent concepts are included in the scope of the present invention. Should be.

110: first optical package part
120: second optical package portion
110 ', 120': housing
110'a, 120'a: body housing
110'b, 120'b: first housing
110'c, 120'c: second housing
112, 125: tap coupler filter
113 and 126: photodiodes
114, 124: Isolator
115, 122: wavelength division multiplexer
116, 123: pump laser diode
L1 ~ L6: Lens

Claims (13)

In the optical package device,
A first lens for projecting an optical signal received from an input optical fiber in parallel;
A tap coupler filter which transmits the optical signal projected through the first lens to the isolator and branches the optical signal;
A photodiode for sensing the branched optical signal;
An isolator for fixing the flow direction of the optical signal received from the tap coupler filter;
A pump laser diode for generating pumped light;
A wavelength division far multiplexer for coupling the pumped light and the optical signal passed through the isolator;
A second lens for projecting the optical signal coupled to the pumping light in parallel to the output optical fiber,
The input optical fiber and the output optical fiber are spaced apart from each other and arranged side by side,
The first lens, the tap coupler filter and the photodiode are sequentially disposed along the same central axis as the input optical fiber,
The second lens, the wavelength division multiplexer and the pump laser diode are sequentially disposed along the same central axis as the output optical fiber,
The isolator is disposed between the tap coupler filter and the wavelength division multiplexer, the optical package device disposed along an imaginary straight line connecting the tap coupler filter and the wavelength division multiplexer. The method of claim 1,
And a housing containing the first lens, the tap coupler filter, the isolator, the wavelength division multiplexer, the second lens, the photodiode and the pump laser diode. The method of claim 2,
The housing includes:
A body housing containing the tap coupler filter, the isolator and the wavelength division multiplexer;
A first housing in which the photodiode is stored and coupled to one end of the body housing in a direction crossing the longitudinal direction of the body housing; And
And a second housing having the pump laser diode stored therein and coupled to the other end of the body housing in a direction crossing the longitudinal direction of the body housing so as to face the first housing. The method of claim 1,
And a third lens interposed between the wavelength division multiplexer and the pump laser diode to project the pump light received from the pump laser diode in parallel to the wavelength division multiplexer. In the optical package device,
A first lens for projecting an optical signal received from an input optical fiber in parallel;
A pump laser diode for generating pumped light;
A wavelength division multiplexer for coupling the pumped light and the optical signal passing through the first lens;
An isolator for fixing a flow direction of the optical signal projected through the first lens;
A tap coupler filter for branching a portion of the optical signal passing through the isolator;
A photodiode for sensing an optical signal branched through the tap coupler filter;
A second lens for projecting the optical signal passing through the tap coupler filter in parallel to the output optical fiber,
The input optical fiber and the output optical fiber are spaced apart from each other and arranged side by side,
The first lens, the wavelength division multiplexer and the pump laser diode are sequentially disposed along the same central axis as the input optical fiber,
The second lens, the tap coupler filter and the photodiode are sequentially disposed along the same central axis as the output optical fiber,
The isolator is disposed between the wavelength division multiplexer and the tap coupler filter, the optical package device disposed along an imaginary straight line connecting the tap coupler filter and the wavelength division multiplexer. The method of claim 5, wherein
And a housing containing the first lens, the tap coupler filter, the isolator, the wavelength division multiplexer, the second lens, the photodiode and the pump laser diode. The method according to claim 6,
The housing includes:
A body housing containing the tap coupler filter, the isolator and the wavelength division multiplexer;
A first housing in which the pump laser diode is stored and coupled to one end of the body housing in a direction crossing the longitudinal direction of the body housing; And
And a second housing coupled to the other end of the body housing in a direction crossing the longitudinal direction of the body housing so as to face the first housing when the photodiode is stored. The method of claim 5, wherein
And a fourth lens interposed between the wavelength division multiplexer and the pump laser diode to project the pumped light received from the pump laser diode into parallel to the wavelength division multiplexer. 6. The method according to claim 1 or 5,
And the input optical fiber and the output optical fiber face in the same direction. The method according to claim 3 or 7,
The housing includes:
A third housing containing the input optical fiber and connected to the body housing in a direction opposite to the first housing; And
And a fourth housing containing the output optical fiber and connected to the body housing in a direction opposite to the second housing. The method according to claim 3 or 7,
And the body housing, the first housing, and the second housing have a U-shaped shape. 11. The method of claim 10,
The housing has an H-shaped shape optical package device. In an erbium-doped fiber amplifier,
A first optical package device corresponding to the configuration of claim 1;
An erbium-doped optical fiber having one end coupled to an output optical fiber of the first optical package device; And
And a second optical package device corresponding to the configuration of claim 5, wherein the other end of the erbium-doped optical fiber and the input optical fiber are combined.

Images