KR20060122016A - Triplexer optical module - Google Patents

Triplexer optical module Download PDF

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KR20060122016A
KR20060122016A KR1020050043918A KR20050043918A KR20060122016A KR 20060122016 A KR20060122016 A KR 20060122016A KR 1020050043918 A KR1020050043918 A KR 1020050043918A KR 20050043918 A KR20050043918 A KR 20050043918A KR 20060122016 A KR20060122016 A KR 20060122016A
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South Korea
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optical signal
lens
digital
filter
signal
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KR1020050043918A
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Korean (ko)
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KR100656856B1 (en
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정동기
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(주)애니피아
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4246—Bidirectionally operating package structures

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Communication System (AREA)

Abstract

A triplexer optical module is provided to use a common lens, instead of an expensive collimating lens, thereby shortening the assembling time and thus reducing the cost. An optical cable outputs a digital down optical signal and an analog down optical signal, and receives a digital up optical signal. A first filter(12) extracts the analog down optical signal, and a first lens(14) collects the analog down optical signal extracted by the first filter. A first photoelectric converter(16) converts the light collected by the first lens into an electric signal. A second filter(13) extracts the analog down optical signal, and a second lens(17) collects the analog down optical signal extracted by the second filter. A second photoelectric converter(19) converts the light collected by the second lens into an electric signal. A photoelectric converter converters the digital up electric signal to an optical signal. A third lens(18) collects the light output from the photoelectric converter.

Description

트라이플렉서 광모듈{Triplexer Optical Module}Triplexer Optical Module

도1은 종래기술에 따른 트라이플렉서 광모듈의 구성도1 is a block diagram of a triplex optical module according to the prior art

도2는 본 발명에 따른 트라이플렉서 광모듈의 구성도2 is a block diagram of a triplex optical module according to the present invention

도3은 본 발명의 다른 실시 예에 따른 트라이플렉서 광모듈의 구성도3 is a block diagram of a triplex optical module according to another embodiment of the present invention

본 발명은 하나의 광케이블을 이용하여, 인터넷 등의 양방향 디지털 통신을 할 뿐만 아니라 CATV 등의 아날로그 광신호 분배까지 실행할 수 있는 트라이플렉서 광모듈에 관한 것이다.The present invention relates to a triplex optical module capable of performing not only bidirectional digital communication such as the Internet, but also analog optical signal distribution such as CATV using one optical cable.

종래에는 광케이블을 이용한 양방향 인터넷을 위해, WDM(Wavelength Division Multiplexing)기술을 이용하여 상/하향 신호의 광파장을 상이하도록 하는 다이플렉서(diplexer)가 사용되었는데, 최근에는 다양한 채널의 CATV 등의 아날로그 신호를 추가하기 위하여 트라이플렉서(Triplxer)의 필요성이 대두되어 왔다.Conventionally, for a bidirectional Internet using an optical cable, a diplexer that uses different wavelengths of up / down signals using WDM (Wavelength Division Multiplexing) technology has been used. Recently, analog signals such as CATV of various channels have been used. The need for a triplexer has emerged to add.

이러한 필요성에 따라 종래에는 도1에서와 같이 콜리메이팅 렌즈를 사용하여 렌즈의 출력이 평행광이 되도록 구성을 하였다.In accordance with such a necessity, the collimating lens is conventionally used as shown in FIG. 1 to configure the output of the lens to be parallel light.

이렇게 콜리메이팅 렌즈를 사용하여 무한 광학계를 구성한 이유는 광케이블 과 포토 다이오드 및 레이저 다이오드 간의 거리가 길어서 광손실을 줄이기 위해서이다.The reason why the infinite optical system is constructed using the collimating lens is to reduce the optical loss due to the long distance between the optical cable, the photodiode and the laser diode.

보다 자세히 설명하면, 디지털 하향 신호는 광케이블(1)에서 출력되는 광이 콜리메이팅 렌즈(2)를 거쳐 평행광으로 되어 이 평행광이 제1 WDM필터(3)(아날로그 하향 광신호(1550nm)만 반사함)를 통과하고 제2 WDM 필터(4)(디지털 하향 광신호(1490nm)만 반사함)에서 반사되어 디지털 하향 신호의 파장(1490nm)만 걸러져서 이 평행광이 다시 콜리메이팅 렌즈(5)를 거쳐 집적광으로 되어 제1 포토 다이오드(PD1: 6)에서 전기적인 신호로 변환되도록 하여 디지털 하향 전기신호가 되어 인터넷용 PC 등으로 입력되게 된다.In more detail, in the digital downlink signal, the light output from the optical cable 1 becomes parallel light through the collimating lens 2 so that the parallel light is only the first WDM filter 3 (analog downlink optical signal 1550nm). Reflected light) and reflected from the second WDM filter 4 (reflecting only the digital downlink light signal (1490 nm)) to filter only the wavelength (1490 nm) of the digital down signal so that the parallel light is again collimated lens (5). Through the integrated light is converted into an electrical signal in the first photodiode (PD1) (6) to become a digital downward electrical signal is input to the Internet PC.

또한, 디지털 상향 신호는 전기적인 신호가 레이저 다이오드(LD: 7)에 의해 1310nm의 상향 광신호로 변환되고 이 레이저 다이오드(7)의 출력이 콜리메이팅 렌즈(8)에 의해 평행광으로 변환되어 이 평행광이 콜리메이팅 렌즈(2)에서 집속광으로 변환되어 광케이블(1)로 입력되도록 한다.In addition, the digital uplink signal is converted into a 1310nm uplink optical signal by a laser diode (LD) 7, and the output of the laser diode 7 is converted into parallel light by the collimating lens 8. Parallel light is converted into collimated light from the collimating lens 2 to be input to the optical cable 1.

다음으로, CATV 등의 아날로그 하향 신호 역시 디지털 하향 신호와 동일한 방식으로, 광케이블(1)에서 나온 출력(1550nm)이 콜리메이팅 렌즈(2)에 의해 평행광으로 변환되어 이 평행광이 제1 WDM 필터(3)에서 반사되어 콜리메이팅 렌즈(9)에서 다시 집속광으로 변환되어 제2 포토 다이오드(PD2 : 10)에 의해 전기적인 신호로 변환되어 CATV 등으로 전송되게 된다.Next, the analog downlink signal such as CATV is also the same as the digital downlink signal. The output (1550 nm) from the optical cable 1 is converted into parallel light by the collimating lens 2 so that the parallel light is converted into the first WDM filter. Reflected by (3), the collimating lens 9 is converted back into focused light, and is converted into an electrical signal by the second photodiode PD2: 10 to be transmitted to CATV or the like.

결국, 이상과 같은 종래기술의 트라이플렉서는 4개의 콜리메이팅 렌즈(2, 5, 8, 9)를 사용하게 된다.As a result, the prior art triplexer uses four collimating lenses 2, 5, 8, and 9.

그런데, 이러한 콜리메이팅 렌즈는 일반 렌즈(집속광을 출력함)와 달리 평행광을 출력해야 하므로 가격이 고가이고, 광케이블과의 정렬시 각도가 틀어진 것도 보상해 주어야 하므로 트라이플렉서 광모듈의 제조시간이 많이 걸리고, 이 콜리메이팅 렌즈와 정렬된 레이저 다이오드 및 포토 다이오드의 제조가 필수적이어서, 결국 제조 단가가 높고 제조 시간이 많이 걸린다는 단점이 있다.However, since the collimating lens has to output parallel light unlike the general lens (focusing light output), the price is expensive, and the manufacturing time of the triplex optical module is compensated because the angle of alignment with the optical cable must be compensated. This takes a lot, and the manufacturing of the laser diode and the photodiode aligned with the collimating lens is essential, and thus, there is a disadvantage in that the manufacturing cost is high and the manufacturing time is very long.

본 발명은 이상과 같은 종래기술의 문제점을 감안하여, 제조단가가 낮고 제조 기간이 적게 걸리는 트라이플렉서 광모듈을 제공한다.The present invention provides a triplex optical module having a low manufacturing cost and a short manufacturing period in view of the above problems of the prior art.

이상의 목적을 달성하기 위한 본 발명은,The present invention for achieving the above object,

디지털 하향 광신호와 아날로그 하향 광신호를 출력하고 디지털 상향 광신호를 입력시키는 광케이블과; 상기 아날로그 하향 광신호를 추출하는 제1 필터와;An optical cable for outputting a digital downlink optical signal and an analog downlink optical signal and inputting a digital uplink optical signal; A first filter for extracting the analog downlink optical signal;

상기 제1 필터에서 추출된 아날로그 하향 광신호를 집속시키는 제1 렌즈와;A first lens for focusing the analog downlink optical signal extracted by the first filter;

상기 제1 렌즈에 의해 집속된 광을 전기적인 신호로 변환시키는 제1 광전 변환 장치와; 상기 디지털 하향 광신호를 추출하는 제2 필터와; 상기 제2 필터에서 추출된 디지털 하향 광신호를 집속시키는 제2 렌즈와; 상기 제2 렌즈에 의해 집속된 광을 전기적인 신호로 변환시키는 제 2 광전 변환장치와; 디지털 상향 전기신호를 광신호로 변환하는 전광 변환장치와; 상기 전광 변환장치에서 출력되는 광을 집속하여 출력하는 제3렌즈를 포함하는 것을 특징으로 한다.A first photoelectric conversion device for converting the light focused by the first lens into an electrical signal; A second filter for extracting the digital downlink optical signal; A second lens for focusing the digital downlink optical signal extracted by the second filter; A second photoelectric conversion device converting the light focused by the second lens into an electrical signal; An all-optical converter for converting a digital upward electrical signal into an optical signal; And a third lens for focusing and outputting light output from the all-optical converter.

이상과 같은 트라이플렉서 광모듈을 달성하기 위한 본 발명의 실시예를 도2 를 참고로 하여 설명하도록 한다.An embodiment of the present invention for achieving the above-described triplexer optical module will be described with reference to FIG.

광케이블(11)에서 출력되는 인터넷 등을 위한 디지털 하향 광신호(1490nm)는 일정 각도의 발산각(예를들면 6도 정도)을 가지고 출력되어, CATV용 광신호(1550nm)를 반사시키고 하향 디지털 광신호(1490nm)와 상향 디지털 광신호(1310nm)를 투과시키는 제1 WDM필터(12)를 통과하고, 디지털 하향 광신호(1490nm)를 반사시키는 제2 WDM 필터(13)에서 반사를 하여 일반 렌즈(14)에 입력되어 일반렌즈(14)의 출력에서는 집광되어 포토 다이오드(PD1:15)에서 전기적인 신호로 변환되어 디지털 하향 전기신호로 변환되어 PC등으로 출력된다.The digital downlink optical signal (1490nm) for the Internet or the like output from the optical cable 11 is output with a divergence angle (for example, about 6 degrees) at a predetermined angle, reflecting the CATV optical signal (1550nm) and downlink digital optical signal. After passing through the first WDM filter 12 that transmits the signal 1490 nm and the upward digital optical signal 1310 nm, the second WDM filter 13 reflects the digital downward optical signal 1490 nm and reflects the general lens ( 14) and is concentrated at the output of the general lens 14, converted into an electrical signal in the photodiode PD1: 15, converted into a digital downward electrical signal, and output to the PC.

또한 PC 등에서 출력되어 레이저 다이오드(LD:16)로 입력되는 디지털 상향 전기적인 신호는 레이저 다이오드(16)에서 광신호(1310nm)로 변환되어 일반 렌즈(17)에 의해 집속되어, 제2 WDM필터(13)과 제1 WDM 필터(12)를 거쳐 광케이블(11)의 측면 단부의 중심점을 통해 광케이블(11)로 들어간다.In addition, the digital up-electrical signal output from the PC or the like and input to the laser diode LD: 16 is converted into the optical signal 1310 nm from the laser diode 16 and focused by the general lens 17 to collect the second WDM filter ( 13) and the first WDM filter 12 to enter the optical cable 11 through the center point of the side end of the optical cable 11.

마지막으로, 광케이블(11)의 단부에서 출력되는 CATV 등을 위한 아날로그 하향 광신호(1550nm) 역시 일정 각도의 발산각(예를들면 6도)을 가지고 출력되어, CATV용 광신호(1550nm)를 반사시키는 제1 WDM필터(12)에서 반사되어 일반 렌즈(18)에 의해 집광되어 포토 다이오드(PD2:19)에서 전기적인 신호로 변환되어 아날로그 하향 전기신호로 변환된다.Finally, the analog downlink optical signal (1550 nm) for CATV and the like output from the end of the optical cable 11 is also output with a divergence angle (for example, 6 degrees) at a predetermined angle to reflect the optical signal for CATV (1550 nm). It is reflected by the first WDM filter 12 to be condensed by the general lens 18 and converted into an electrical signal in the photodiode (PD2: 19) is converted into an analog downward electrical signal.

결국, 이상과 같은 본 발명을 이용하면 기존의 고가이고 정열이 어려운 콜리메이팅 렌즈 대신에 일반 렌즈를 사용할 수 있게 되어 가격이 저렴해지고 제조시간이 단축될 수 있으며, 렌즈의 개수도 4개에서 3개로 줄게 되어 부품수가 적어지게 된다는 장점이 있게 된다.As a result, using the present invention as described above it is possible to use a general lens in place of the existing expensive and difficult to align the collimating lens is cheaper and the manufacturing time can be shortened, the number of lenses from four to three This reduces the number of parts is an advantage.

한편, 이상에서의 제1 WDM필터(12)와 제2 WDM필터(13)는 이상적으로는 각각 CATV용 광신호(1550nm)만 반사시키고, 디지털 하향 광신호(1490nm)만 반사시켜야 한다.On the other hand, the first WDM filter 12 and the second WDM filter 13 should ideally reflect only the CATV optical signal (1550 nm), respectively, and should reflect only the digital downlink optical signal (1490 nm).

그러나, 실제로는 이러한 성질을 가지는 WDM필터를 제조한다는 것이 현실적으로 어려움이 있어 제1WDM필터(12)의 포토 다이오드(19)쪽의 출력에서는 적으나마 디지털 하향 광신호(1490nm)도 포함하게 되어 일반 렌즈(18)로 향하는 광에는 적으나마 디지털 하향 광신호(1490nm)가 혼재하게 된다.In reality, however, it is difficult to manufacture a WDM filter having such a property, so that a small amount of digital downward optical signal (1490 nm) is also included at the output of the photodiode 19 side of the first WDM filter 12, so that a general lens ( There is a small amount of light directed to 18), but the digital downward optical signal (1490 nm) is mixed.

또한 제2 WDM 필터(13)의 포트 다이오드(15)쪽 출력에서도 마찬가지로 포토 다이오드(15)용 디지털 하향 광신호(1490nm) 뿐만 아니라 적으나마 아날로그 하향 광신호(1550nm)가 혼재하게 된다.Similarly, not only the digital downlink optical signal (1490nm) for the photodiode 15 but also the analog downlink optical signal (1550nm) are mixed in the output of the port diode 15 side of the second WDM filter 13.

따라서 본 발명의 다른 실시에서는 도3에서와 같이 일반 렌즈(18)와 일반렌즈(17) 각각에 제거 필터(rejection filter)(22, 21)를 두어 오직 하향 아날로그 광신호(1550nm)와 하향 디지털 광신호(1490nm)만이 포토다이오드(19)와 포토 다이오드(15)로 입력되게 한다면 보다 성능이 우수한 트라이플렉서를 구성할 수 있다.Accordingly, in another embodiment of the present invention, as shown in FIG. 3, the rejection filters 22 and 21 are disposed in the general lens 18 and the general lens 17, respectively, so that only the downlink analog light signal (1550 nm) and the downlink digital light are provided. If only a signal (1490nm) is input to the photodiode 19 and the photodiode 15, it is possible to construct a triplexer with better performance.

이상에서는 본 발명의 바람직한 실시예를 설명하였으나, 본 발명은 이러한 실시예에 한정되는 것이 아니라 본 발명의 사상을 벗어나지 않는 범위 내에서 다양한 변형이 가능하다는 전에 유의해야 한다.While the preferred embodiments of the present invention have been described above, it should be noted that the present invention is not limited to these embodiments, but various modifications can be made without departing from the spirit of the present invention.

예를들어, 이상에서 사용된 WDM필터 대신에 광파워 분할 필터를 사용해도 가 능하다.For example, an optical power split filter may be used instead of the WDM filter used above.

이상과 같이 본 발명을 구성하면 일반렌즈를 사용할 수 있게 되고 렌즈의 수도 줄이게 되어 트라이플렉서의 제조 단가가 저렴하게 되고 제조시간이 단축되게 된다.When the present invention is configured as described above, a general lens can be used and the number of lenses can be reduced, so that the manufacturing cost of the triplexer is inexpensive and the manufacturing time is shortened.

Claims (8)

디지털 하향 광신호와 아날로그 하향 광신호를 출력하고 디지털 상향 광신호를 입력시키는 광케이블과;An optical cable for outputting a digital downlink optical signal and an analog downlink optical signal and inputting a digital uplink optical signal; 상기 아날로그 하향 광신호를 추출하는 제1 필터와;A first filter for extracting the analog downlink optical signal; 상기 제1 필터에서 추출된 아날로그 하향 광신호를 집속시키는 제1 렌즈와;A first lens for focusing the analog downlink optical signal extracted by the first filter; 상기 제1 렌즈에 의해 집속된 광을 전기적인 신호로 변환시키는 제1 광전 변환 장치와;A first photoelectric conversion device for converting the light focused by the first lens into an electrical signal; 상기 디지털 하향 광신호를 추출하는 제2 필터와;A second filter for extracting the digital downlink optical signal; 상기 제2 필터에서 추출된 디지털 하향 광신호를 집속시키는 제2 렌즈와;A second lens for focusing the digital downlink optical signal extracted by the second filter; 상기 제2 렌즈에 의해 집속된 광을 전기적인 신호로 변환시키는 제 2 광전 변환장치와;A second photoelectric conversion device converting the light focused by the second lens into an electrical signal; 디지털 상향 전기신호를 광신호로 변환하는 전광 변환장치와;An all-optical converter for converting a digital upward electrical signal into an optical signal; 상기 전광 변환장치에서 출력되는 광을 집속하여 출력하는 제3렌즈를 포함하는 것을 특징으로 하는 트라이플렉서 광모듈 장치.And a third lens for focusing and outputting the light output from the all-optical converter. 제1항에 있어서, 상기 제1, 2 필터는 WDM 필터인 것을 특징으로 하는 트라이플렉서 광모듈 장치.The apparatus of claim 1, wherein the first and second filters are WDM filters. 제1항에 있어서, 상기 제1,2 필터는 광파워 분할필터인 것을 특징으로 하는 트라이플렉서 광모듈 장치.The apparatus of claim 1, wherein the first and second filters are optical power split filters. 제1항에 있어서, 상기 제1, 2 광전 변환장치는 포토 다이오드인 것을 특징으로 하는 트라이플렉서 광모듈 장치.The apparatus of claim 1, wherein the first and second photoelectric converters are photodiodes. 제1항에 있어서, 상기 전광 변환장치는 레이저 다이오드인 것을 특징으로 하는 트라이플렉서 광모듈 장치.The apparatus of claim 1, wherein the all-optical converter is a laser diode. 제1항에 있어서, 상기 제1, 2 렌즈의 전단에는 불필요한 파장의 광을 제거하는 제거필터가 더 포함되어 있는 것을 특징으로 하는 트라이플렉서 광모듈 장치.The apparatus of claim 1, wherein a front end of the first and second lenses further includes a removal filter for removing light having an unnecessary wavelength. 제1항에 있어서, 상기 디지털 하향 및 상향 광신호는 인터넷용인 것을 특징으로 하는 트라이플렉서 광모듈 장치.The apparatus of claim 1, wherein the digital downlink and uplink optical signals are for the Internet. 제1항에 있어서, 상기 아날로그 하향 광신호는 CATV용인 것을 특징으로 하는 트라이플렉서 광모듈 장치.The apparatus of claim 1, wherein the analog downlink optical signal is for CATV.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100871017B1 (en) * 2008-07-21 2008-11-27 김정수 Optical modulator package for triplexer type bi-directional data communication, and method for manufacturing the beam splitter/filter
CN111194420A (en) * 2018-07-23 2020-05-22 华为技术有限公司 Optical assembly, optical module and communication equipment

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US4842357A (en) 1988-08-08 1989-06-27 The Boeing Company Integrated wavelength division multiplexed optical sensor
JP3698393B2 (en) 1998-12-11 2005-09-21 富士通株式会社 Structure of optical transceiver module and manufacturing method thereof
JP2002243960A (en) 2001-02-19 2002-08-28 Ntt Advanced Technology Corp Polymer-made filter type multichannel wavelength multiplexing and branching device
KR20050029083A (en) * 2003-09-20 2005-03-24 (주) 빛과 전자 Triplexer optical sub-assembly module with a built-in wdm coupler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100871017B1 (en) * 2008-07-21 2008-11-27 김정수 Optical modulator package for triplexer type bi-directional data communication, and method for manufacturing the beam splitter/filter
CN111194420A (en) * 2018-07-23 2020-05-22 华为技术有限公司 Optical assembly, optical module and communication equipment

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