WO2008054045A1 - Appareil pour combiner et découper une bande de longueur d'ondes comportant trois ports entrée et sortie - Google Patents

Appareil pour combiner et découper une bande de longueur d'ondes comportant trois ports entrée et sortie Download PDF

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Publication number
WO2008054045A1
WO2008054045A1 PCT/KR2007/000255 KR2007000255W WO2008054045A1 WO 2008054045 A1 WO2008054045 A1 WO 2008054045A1 KR 2007000255 W KR2007000255 W KR 2007000255W WO 2008054045 A1 WO2008054045 A1 WO 2008054045A1
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WO
WIPO (PCT)
Prior art keywords
port
wavelength
band
filter
range
Prior art date
Application number
PCT/KR2007/000255
Other languages
English (en)
Inventor
Chang-Hee Lee
Ki-Man Choi
Sil-Gu Mun
Jung-Hyung Moon
Hoon-Keun Lee
Original Assignee
Korea Advanced Institute Of Science And Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020060130914A external-priority patent/KR100801329B1/ko
Application filed by Korea Advanced Institute Of Science And Technology filed Critical Korea Advanced Institute Of Science And Technology
Publication of WO2008054045A1 publication Critical patent/WO2008054045A1/fr

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Classifications

    • 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
    • G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
    • 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
    • G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
    • G02B6/29364—Cascading by a light guide path between filters or filtering operations, e.g. fibre interconnected single filter modules
    • 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
    • G02B6/29379—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 characterised by the function or use of the complete device
    • G02B6/2938—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 characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM

Definitions

  • the present invention relates to an apparatus for combining and splitting wavelength bands having three input and output ports for bi-directional transmission. More specifically, the present invention relates to an apparatus for combining and splitting wavelength bands having three input and output ports, which is capable of adding a new wavelength band for new bi-directional transmission and is necessary for combining with an existing wavelength band being transmitted bi-directionally through a one-line transmission path or for splitting from the existing wavelength band, while accommodating the existing wavelength band as it is.
  • a need for broadband services is increased rapidly since the use of Internet has been increased and image and video oriented services have been generally used, and thus an interest has been focused on a metro/access network which connects a remote node to subscribers.
  • a method of accomplishing a high-speed must be done easily and at low costs to accommodate many subscribers.
  • a new wavelength band may be added as a transmission wavelength band, in addition to an existing wavelength band which has already been used. For doing so, a new wavelength band should be combined with or split from the existing wavelength band so that an apparatus for combining and splitting wavelength bands is required.
  • the add/drop multiplexers of the prior art may combine and split only a signal having a predetermined specific wavelength.
  • usability of the add/drop multiplexers has a certain limitation. Disclosure of Invention Technical Problem
  • the object of the present invention is to solve the prior art problems and provide an optical passive element, which is capable of adding a new wavelength band for new bidirectional transmission and is necessary for combining with an existing wavelength band being transmitted bi-directionally through a one-line transmission path or for splitting from the existing wavelength band, while accommodating the existing wavelength band as it is.
  • the present invention provides an apparatus for combining and splitting wavelength bands having three input and output ports for bi-directional transmission comprising: two wavelength division multiplexing (WDM) filters, each of which splits X-band having a range of a first wavelength or less and Y-band having a range of a second wavelength or more from a wavelength band of light being transmitted though the three input and output ports; and one WDM filter for splitting one or more Z-bands having a range of a third wavelength within either X-band having the range of the first wavelength or less or Y-band having the range of the second wavelength or more.
  • WDM wavelength division multiplexing
  • the present invention provides an apparatus for combining and splitting wavelength bands having three input and output ports for bi-directional transmission according to the first aspect of the present invention, wherein any two of the three input and output ports are respectively comprised of a first edge filter for splitting X-band having the range of the first wavelength or less and Y-band having the range of the second wavelength or more from the wavelength band of light being transmitted; and a second edge filter for splitting X-band having the range of the first wavelength or less and Y-band having the range of the second wavelength or more from the wavelength band of light being transmitted, and wherein one remaining input and output port is comprised of a coarse wavelength division multiplexing (CWDM) filter for splitting one or more Z-bands having the range of the third wavelength within Y-band having the range of the second wavelength or more.
  • CWDM coarse wavelength division multiplexing
  • the present invention provides an apparatus for combining and splitting wavelength bands having three input and output ports for bi-directional transmission comprising: one wavelength division multiplexing (WDM) filter for splitting X-band having a range of a first wavelength or less and Y-band having a range of a second wavelength or more from a wavelength band of light being transmitted though the three input and output ports; and two WDM filters, each of which splits one or more Z-bands having a range of a third wavelength within either X-band having the range of the first wavelength or less or Y-band having the range of the second wavelength or more.
  • WDM wavelength division multiplexing
  • the present invention provides an apparatus for combining and splitting wavelength bands according to the third aspect of the present invention, wherein any one of the three input and output ports is comprised of an edge filter for splitting X-band having the range of the first wavelength or less and Y-band having the range of the second wavelength or more from the wavelength band of light being transmitted, and wherein two remaining input and output ports are respectively comprised of a first coarse wavelength division multiplexing (CWDM) filter for splitting one or more Z-bands having the range of the third wavelength within Y-band having the range of the second wavelength or more; and a second CWDM filter for splitting one or more Z-bands having the range of the third wavelength within Y-band having the range of the second wavelength or more.
  • CWDM coarse wavelength division multiplexing
  • An apparatus for combining and splitting wavelength bands having three input and output ports according to the present invention has the following advantages:
  • the present invention can be embodied at low costs and with a simple configuration so that it may function as the prior art add/drop multiplexers.
  • the present invention may combine a wavelength band having a certain range with or splitting it from an existing signal band so that high usability can be accomplished in the present invention.
  • the present invention may be utilized as an element for upgrading and expanding an existing metro network or an existing access network so that performance of an optical communications system can be enhanced at low costs.
  • Fig. 1 illustrates a general view of split bands of a wavelength division multiplexing filter and bi-directional wavelength bands for bi-directional transmission.
  • Fig. 2 illustrates another general view of split bands of a wavelength division multiplexing filter and bi-directional wavelength bands for bi-directional transmission.
  • FIG. 3 illustrates a first embodiment of an apparatus for combining and splitting wavelength bands according to the present invention for bi-directional transmission illustrated in Fig. 1.
  • FIG. 4 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the first embodiment of the present invention illustrated in Fig. 3.
  • FIG. 5 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the first embodiment of the present invention illustrated in Fig. 3.
  • FIG. 6 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the first embodiment of the present invention illustrated in Fig. 3.
  • Fig. 7 illustrates a second embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 1.
  • FIG. 8 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the second embodiment of the present invention illustrated in Fig. 7.
  • FIG. 9 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the second embodiment of the present invention illustrated in Fig. 7.
  • FIG. 10 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the second embodiment of the present invention illustrated in Fig. 7.
  • FIG. 11 illustrates a third embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 1.
  • Fig. 12 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the third embodiment of the present invention illustrated in Fig. 11.
  • FIG. 13 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the third embodiment of the present invention illustrated in Fig. 11.
  • Fig. 14 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the third embodiment of the present invention illustrated in Fig. 11.
  • Fig. 15 illustrates a fourth embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 2.
  • Fig. 16 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • Fig. 17 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • Fig. 16 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • Fig. 17 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • Fig. 15 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the third embodiment
  • FIG. 18 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • Fig. 19 illustrates a fifth embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 2.
  • Fig. 20 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fifth embodiment of the present invention illustrated in Fig. 19.
  • Fig. 21 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fifth embodiment of the present invention illustrated in Fig. 19.
  • Fig. 22 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fifth embodiment of the present invention illustrated in Fig. 19.
  • Fig. 23 illustrates a sixth embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 2.
  • Fig. 24 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the sixth embodiment of the present invention illustrated in Fig. 23.
  • Fig. 25 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the sixth embodiment of the present invention illustrated in Fig. 23.
  • Fig. 26 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the sixth embodiment of the present invention illustrated in Fig. 23. Mode for the Invention
  • An apparatus for combining and splitting wavelength bands having three input and output ports may be embodied by either a first type apparatus for combining and splitting wavelength bands having three input and output ports comprising a combination of a first and a second wavelength division multiplexing (WDM) filters, each of which has a function of splitting X-band and Y-band, and a third WDM filter having a function of splitting one or more Z-bands, which are a sub-band, within either X-band or Y-band, or a second type apparatus for combining and splitting wavelength bands having three input and output ports comprising a combination of a first and a second WDM filters, each of which has a function of splitting one or more Z-bands, which are a sub-band, within either X-band or Y-band, and a third WDM filter having a function of splitting X-band and Y-band.
  • WDM wavelength division multiplexing
  • first and the second WDM filters may be embodied respectively by an edge-filter and the third WDM filter may be embodied by a coarse wavelength division multiplexing (CWDM) filter in the first type apparatus for combining and splitting wavelength bands.
  • first and the second WDM filters may be embodied respectively by a CWDM filter and the third WDM filter may be embodied by an edge-filter in the second type apparatus for combining and splitting wavelength bands.
  • the apparatus for combining and splitting wavelength bands having three input and output ports according to the present invention as described above enables bidirectional transmission in at least four bands (either X-band, Z-band, Yl -band, Y2-band, or Y-band, Z-band, Xl -band, X2-band).
  • Fig. 1 illustrates a general view of split bands of a wavelength division multiplexing filter and bi-directional wavelength bands for bi-directional transmission
  • Fig. 2 illustrates another general view of split bands of a wavelength division multiplexing filter and bi-directional wavelength bands for bi-directional transmission.
  • a case of bi-directional transmission is illustrated where bidirectional transmission is made by using X-band and Z-band, while Y-band is split into two bands (i.e., Yl -band and Y2-band) with split bands and bi-directional transmission bands of WDM filters for bi-directional transmission in four bands.
  • a case of bi-directional transmission is illustrated where bi-directional transmission is made by using Y-band and Z-band, while X-band is split into two bands (i.e., Xl -band and X2-band) with split bands and bi-directional transmission bands of WDM filters for bi-directional transmission in four bands.
  • wavelength transmission and reflection characteristics of a WDM filter may vary depending on the bands of bi-directional transmission which is desired to be used.
  • an edge-filter is used for a first and a second filters, respectively, each having a function of splitting X-band and Y-band, among WDM filters being used for bi-directional transmission from Figs. 1 and 2 described above, while a CWDM filter is used for a third and a fourth filters, respectively, each having a function of splitting one or more Z-bands, which are a sub-band, within either X-band or Y-band.
  • a CWDM filter being used may be capable of splitting one or more Z-bands (Zl -band, Z2-band, ... etc.).
  • FIG. 3 illustrates a first embodiment of an apparatus for combining and splitting wavelength bands according to the present invention for bi-directional transmission illustrated in Fig. 1.
  • an apparatus for combining and splitting wavelength bands comprises a combination of a first and second edge filters, each for splitting X-band and Y-band from a wavelength band of light being transmitted, and a CWDM filter for splitting one or more Z-bands within Y-band.
  • a first and second edge filters each for splitting X-band and Y-band from a wavelength band of light being transmitted
  • a CWDM filter for splitting one or more Z-bands within Y-band.
  • a downstream signal having a wavelength band with a range of 1550 ⁇ 1560 nm within Y-band may be added as Z2-band.
  • an apparatus for combining and splitting wavelength bands comprises a first edge filter for splitting X-band having 1360 nm or less and Y-band having 1415 nm or more from a wavelength band of light being transmitted; a second edge filter for splitting X-band having 1360 nm or less and Y-band having 1415 nm or more from the wavelength band of light being transmitted; and a CWDM filter for splitting Z-bands having a range of 1480 ⁇ 1500 nm and a range of 1550 ⁇ 1560 nm within Y-band having 1415 nm or more.
  • a reflection port of the first edge filter is connected to a reflection port of the CWDM filter, while a pass port of the first edge filter is connected to a pass port of the second edge filter.
  • a reflection port of the second edge filter is connected to a common port of the CWDM filter.
  • each of the first and the second edge filters has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less among signals inputted into each common port through each pass port, and has a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more through each reflection port.
  • the CWDM filter outputs a signal having a wavelength band (Z-band) with the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm through its reflection port, while outputting a signal having a remaining wavelength band except Z-band through its common port.
  • All of the first and the second edge filters and the CDWM filter used in Fig. 3 are a passive device and have a reciprocal characteristic.
  • a Z-band signal with the rage of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm is transmitted along a path ® and an X-band signal having 1360 nm or less is transmitted along a path ® so that both the Z-band signal and the X-band signal may be used as bands for bi-directional transmission.
  • an insertion loss of a reflection port is generally less than that of a pass port in a WDM filter
  • the Z-band signal with the rage of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm is designed to pass the reflection port.
  • Yl -band and Y2-band which may be used as another band for bi-directional transmission, are transmitted along a path ®.
  • Yl -band and Y2-band can be respectively selected from anyone consisting a group of E-band (wavelength range: 1360 - 1460 nm), S-band (wavelength range: 1460 ⁇ 1530 nm), C-band (wavelength range: 1530 ⁇ 1565 nm), and L-band (wavelength range: 1565 ⁇ 1625 nm).
  • E-band wavelength range: 1360 - 1460 nm
  • S-band wavelength range: 1460 ⁇ 1530 nm
  • C-band wavelength range: 1530 ⁇ 1565 nm
  • L-band wavelength range: 1565 ⁇ 1625 nm
  • the Z-band signal with the rage of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm may be transmitted along a reverse direction of the path ® and the X-band signal having 1360 nm or less is transmitted along a reverse direction of the path ® so that both the Z-band signal and the X-band signal may be used as bands for bidirectional transmission, while Y l-band and Y2-band may be transmitted along a reverse direction of the path ®.
  • Fig. 4 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the first embodiment of the present invention illustrated in Fig. 3.
  • an apparatus for combining and splitting wavelength bands according to the first alternative embodiment of the first embodiment as illustrated in Fig. 4 illustrates a case that the functions of the pass port and the reflection port of the CWDM filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 3 so that the pass port of the CWDM filter in Fig. 3 is changed to a reflection port in Fig. 4, while the reflection port of the CWDM filter in Fig. 3 is changed to a pass port in Fig. 4.
  • the CWDM filter outputs a signal having a wavelength band (Z-band) with the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • Z-band wavelength band
  • FIG. 5 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the first embodiment of the present invention illustrated in Fig. 3.
  • an apparatus for combining and splitting wavelength bands according to the second alternative embodiment of the first embodiment as illustrated in Fig. 5 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second edge filters are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 3 so that each pass port of the first and the second edge filters in Fig. 3 is changed to a reflection port in Fig. 5, while each reflection port of the first and the second edge filters in Fig. 3 is changed to a pass port in Fig. 5.
  • each of the first and the second edge filters has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into each common port through the reflection port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the pass port.
  • X-band wavelength band
  • Y-band wavelength band
  • FIG. 6 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the first embodiment of the present invention illustrated in Fig. 3.
  • an apparatus for combining and splitting wavelength bands according to the third alternative embodiment of the first embodiment as illustrated in Fig. 6 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second edge filters and the CWDM filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 3 so that each pass port of the first and the second edge filters and the CWDM filter in Fig. 3 is changed to a reflection port in Fig. 6, while each reflection port of the first and the second edge filters and the CWDM filter in Fig. 3 is changed to a pass port in Fig. 6.
  • each of the first and the second edge filters has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into each common port through the reflection port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the pass port.
  • the CWDM filter outputs a signal having a wavelength band (Z-band) with the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • a filter for passing Z-band may be added between the first edge filter and the CWDM filter in Figs. 3 to 6, in order to reduce crosstalk of Yl -band and Y2-band which influences X-band and Z-band.
  • the filter for passing Z- band may be embodied by a CWDM filter or a band-pass filter (BPF).
  • Fig. 7 illustrates a second embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 1.
  • an apparatus for combining and splitting wavelength bands comprises a first CWDM filter for splitting Z-bands having a range of 1480 ⁇ 1500 nm and/or a range of 1550 ⁇ 1560 nm within Y-band having 1415 nm or more from a wavelength band of light being transmitted; an edge filter for splitting X-band having 1360 nm or less and Y- band having 1415 nm or more within the wavelength band of light being transmitted; and a second CWDM filter splitting Z-bands having the range of 1480 ⁇ 1500 nm and/ or the range of 1550 ⁇ 1560 nm within Y-band having 1415 nm or more.
  • a reflection port of the first CWDM filter is connected to a reflection port of the second CWDM filter, while a pass port of the first CWDM filter is connected to a pass port of the edge filter.
  • a reflection port of the edge filter is connected to a common port of the second CWDM filter.
  • FIG. 8 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the second embodiment of the present invention illustrated in Fig. 7.
  • an apparatus for combining and splitting wavelength bands according to the first alternative embodiment of the second embodiment as illustrated in Fig. 8 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 7 so that each pass port of the first and the second CWDM filters in Fig. 7 is changed to a reflection port in Fig. 8, while each reflection port of the first and the second CWDM filters in Fig. 7 is changed to a pass port in Fig. 8.
  • each of the first and the second CWDM filters outputs a signal having a wavelength band (Z-band) with the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • Z-band wavelength band
  • FIG. 9 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the second embodiment of the present invention illustrated in Fig. 7.
  • an apparatus for combining and splitting wavelength bands according to the second alternative embodiment of the second embodiment as illustrated in Fig. 9 illustrates a case that the functions of the pass port and the reflection port of the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 7 so that the pass port of the edge filter in Fig. 7 is changed to a reflection port in Fig. 9, while the reflection port of the edge filter in Fig. 7 is changed to a pass port in Fig. 9.
  • the edge filter has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into the common port through the reflection port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the pass port.
  • FIG. 10 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the second embodiment of the present invention illustrated in Fig. 7.
  • an apparatus for combining and splitting wavelength bands according to the third alternative embodiment of the second embodiment as illustrated in Fig. 10 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters and the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 7 so that each pass port of the first and the second CWDM filters and the edge filter in Fig. 7 is changed to a reflection port in Fig. 10, while each reflection port of the first and the second CWDM filters and the edge filter in Fig. 7 is changed to a pass port in Fig. 10.
  • each of the first and the second CWDM filters outputs a signal having a wavelength band (Z-band) with the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • the edge filter has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into the common port through the reflection port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the pass port.
  • a filter for passing X-band may be added between the first
  • the filter for passing X-band may be embodied by an edge filter or a band-pass filter (BPF).
  • FIG. 11 illustrates a third embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 1.
  • an apparatus for combining and splitting wavelength bands comprises a first CWDM filter for splitting Z-bands having a range of 1480 ⁇ 1500 nm and/or a range of 1550 ⁇ 1560 nm within Y-band having 1415 nm or more from a wavelength band of light being transmitted; a second CWDM filter for splitting Z-bands having the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm within Y-band having 1415 nm or more from the wavelength band of light being transmitted; and an edge filter for splitting X-band having 1360 nm or less and Y-band having 1415 nm or more within the wavelength band of light being transmitted.
  • a reflection port of the first CWDM filter is connected to a reflection port of the edge filter, while a pass port of the first CWDM filter is connected to a pass port of the second CWDM filter.
  • a reflection port of the second CWDM filter is connected to a common port of the edge filter.
  • Fig. 12 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the third embodiment of the present invention illustrated in Fig. 11.
  • an apparatus for combining and splitting wavelength bands according to the first alternative embodiment of the third embodiment as illustrated in Fig. 12 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 11 so that each pass port of the first and the second CWDM filters in Fig. 11 is changed to a reflection port in Fig. 12, while each reflection port of the first and the second CWDM filters in Fig. 11 is changed to a pass port in Fig. 12.
  • each of the first and the second CWDM filters has a function of splitting a signal having a wavelength band (Z-band) with the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm from a signal inputted into the common port through the reflection port, while having a function of splitting a signal having a remaining wavelength band except Z-band through the pass port.
  • Z-band wavelength band
  • FIG. 13 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the third embodiment of the present invention illustrated in Fig. 11.
  • an apparatus for combining and splitting wavelength bands according to the second alternative embodiment of the third embodiment as illustrated in Fig. 13 illustrates a case that the functions of the pass port and the reflection port of the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 11 so that the pass port of the edge filter in Fig. 11 is changed to a reflection port in Fig. 13, while the reflection port of the edge filter in Fig. 11 is changed to a pass port in Fig. 13.
  • the edge filter outputs a signal having a wavelength band (X-band) with 1360 nm or less through the pass port, while outputting a signal having a wavelength band (Y-band) with 1415 nm or more through the reflection port.
  • FIG. 14 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the third embodiment of the present invention illustrated in Fig. 11.
  • an apparatus for combining and splitting wavelength bands according to the third alternative embodiment of the third embodiment as illustrated in Fig. 14 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters and the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 11 so that each pass port of the first and the second CWDM filters and the edge filter in Fig. 11 is changed to a reflection port in Fig. 14, while each reflection port of the first and the second CWDM filters and the edge filter in Fig. 11 is changed to a pass port in Fig. 14.
  • each of the first and the second CWDM filters has a function of splitting a signal having a wavelength band (Z-band) with the range of 1480 ⁇ 1500 nm and/or the range of 1550 ⁇ 1560 nm from a signal inputted into the common port through the reflection port, while having a function of splitting a signal having a remaining wavelength band except Z-band through the pass port.
  • the edge filter outputs a signal having a wavelength band (X-band) with 1360 nm or less through the pass port, while outputting a signal having a wavelength band (Y-band) with 1415 nm or more through the reflection port.
  • a filter for passing X-band may be added between the first
  • the filter for passing X-band may be embodied by an edge filter or a band-pass filter (BPF).
  • FIG. 15 illustrates a fourth embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 2.
  • an apparatus for combining and splitting wavelength bands comprises a combination of a first and second edge filters, each for splitting X-band and Y-band from a wavelength band of light being transmitted, and a CWDM filter for splitting one or more Z-bands within X-band.
  • a first and second edge filters each for splitting X-band and Y-band from a wavelength band of light being transmitted
  • a CWDM filter for splitting one or more Z-bands within X-band.
  • a signal having a wavelength band with a range of 1260 ⁇ 1280 nm within X-band may be added as Z- band.
  • a reflection port of the first edge filter is connected to a reflection port of the CWDM filter, while a pass port of the first edge filter is connected to a pass port of the second edge filter.
  • a reflection port of the second edge filter is connected to a common port of the CWDM filter.
  • each of the first and the second edge filters has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less among signals inputted into each common port through each reflection port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more among signals inputted into each common port through each pass port.
  • the CWDM filter outputs a signal having a wavelength band (Z-band) with the range of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm through its reflection port, while outputting a signal having a remaining wavelength band except Z-band through its pass port.
  • All of the first and the second edge filters and the CDWM filter used in Fig. 15 are a passive device and have a reciprocal characteristic.
  • a Z-band signal with the rage of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm is transmitted along a path ® and a Y-band signal having 1415 nm or more is transmitted along a path ⁇ so that both the Z-band signal and the Y-band signal may be used as bands for bi-directional transmission.
  • Xl-band and X2-band which may be used as another band for bi-directional transmission, are transmitted along a path ®.
  • Xl-band and X2-band can be respectively selected from a wavelength of O-band (wavelength range: 1260 ⁇ 1360 nm).
  • any existing bi-directional signal is inputted into and outputted from the number one port (1) of an apparatus for combining and splitting wavelength bands having three ports according to the present invention as illustrated in Fig. 15 while any newly added bidirectional signals are inputted into and outputted from the number three port (3) thereof, and both any existing bi-directional signals and any newly added bi-directional signals are inputted into and outputted from the number two port (2) thereof.
  • the Z-band signal with the rage of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm may be transmitted along a reverse direction of the path ® and the Y-band signal having 1415 nm or more is transmitted along a reverse direction of the path ⁇ so that both the Z-band signal and the Y-band signal may be used as a band for bi-directional transmission, while Xl-band and X2-band may be transmitted along a reverse direction of the path ®.
  • FIG. 16 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • an apparatus for combining and splitting wavelength bands according to the first alternative embodiment of the fourth embodiment as illustrated in Fig. 16 illustrates a case that the functions of the pass port and the reflection port of the CWDM filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 15 so that the pass port of the CWDM filter in Fig. 15 is changed to a reflection port in Fig. 16, while the reflection port of the CWDM filter in Fig. 15 is changed to a pass port in Fig. 16.
  • the CWDM filter outputs a signal having a wavelength band (Z-band) with the range of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • Z-band wavelength band
  • FIG. 17 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • an apparatus for combining and splitting wavelength bands according to the second alternative embodiment of the fourth embodiment as illustrated in Fig. 17 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second edge filters are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 15 so that each pass port of the first and the second edge filters in Fig. 15 is changed to a reflection port in Fig. 17, while each reflection port of the first and the second edge filters in Fig. 15 is changed to a pass port in Fig. 17.
  • each of the first and the second edge filters has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into each common port through the pass port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the reflection port.
  • Fig. 18 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fourth embodiment of the present invention illustrated in Fig. 15.
  • an apparatus for combining and splitting wavelength bands according to the third alternative embodiment of the fourth embodiment as illustrated in Fig. 18 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second edge filters and the CWDM filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 15 so that each pass port of the first and the second edge filters and the CWDM filter in Fig. 15 is changed to a reflection port in Fig. 18, while each reflection port of the first and the second edge filters and the CWDM filter in Fig. 15 is changed to a pass port in Fig. 18.
  • each of the first and the second edge filters has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into each common port through the pass port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the reflection port.
  • the CWDM filter outputs a signal having a wavelength band (Z-band) with the range of 1260 ⁇ 1280 nm and the range of 1300 ⁇ 1320 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • a filter for passing Z-band may be added between the first edge filter and the CWDM filter in Figs. 15 to 18, in order to reduce crosstalk of Xl -band and X2-band which influences Y-band and Z-band.
  • the filter for passing Z-band may be embodied by a CWDM filter or a band-pass filter (BPF).
  • Fig. 19 illustrates a fifth embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 2.
  • an apparatus for combining and splitting wavelength bands comprises a first CWDM filter for splitting Z-bands having a range of 1260 ⁇ 1280 nm and a range of 1300 ⁇ 1320 nm within X-band having 1360 nm or less from a wavelength band of light being transmitted; an edge filter for splitting X-band having 1360 nm or less and Y-band having 1415 nm or more within the wavelength band of light being transmitted; and a second CWDM filter splitting Z-bands having the range of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm within X-band having 1360 nm or less.
  • a reflection port of the first CWDM filter is connected to a reflection port of the second CWDM filter, while a pass port of the first CWDM filter is connected to a pass port of the edge filter.
  • a reflection port of the edge filter is connected to a common port of the second CWDM filter.
  • FIG. 20 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fifth embodiment of the present invention illustrated in Fig. 19.
  • an apparatus for combining and splitting wavelength bands according to the first alternative embodiment of the fifth embodiment as illustrated in Fig. 20 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 19 so that each pass port of the first and the second CWDM filters in Fig. 19 is changed to a reflection port in Fig. 20, while each reflection port of the first and the second CWDM filters in Fig. 19 is changed to a pass port in Fig. 20.
  • each of the first and the second CWDM filters outputs a signal having a wavelength band (Z-band) with the range of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • Z-band wavelength band
  • FIG. 21 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fifth embodiment of the present invention illustrated in Fig. 19.
  • an apparatus for combining and splitting wavelength bands according to the second alternative embodiment of the fifth embodiment as illustrated in Fig. 21 illustrates a case that the functions of the pass port and the reflection port of the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 19 so that the pass port of the edge filter in Fig. 19 is changed to a reflection port in Fig. 21, while the reflection port of the edge filter in Fig. 19 is changed to a pass port in Fig. 21.
  • the edge filter has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into the common port through the pass port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the reflection port.
  • Fig. 22 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the fifth embodiment of the present invention illustrated in Fig. 19.
  • an apparatus for combining and splitting wavelength bands according to the third alternative embodiment of the fifth embodiment as illustrated in Fig. 22 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters and the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 19 so that each pass port of the first and the second CWDM filters and the edge filter in Fig. 19 is changed to a reflection port in Fig. 22, while each reflection port of the first and the second CWDM filters and the edge filter in Fig. 19 is changed to a pass port in Fig. 22.
  • each of the first and the second CWDM filters outputs a signal having a wavelength band (Z-band) with the range of 1260 ⁇ 1280 nm and/or the range of 1300 - 1320 nm through the pass port, while outputting a signal having a remaining wavelength band except Z-band through the reflection port.
  • the edge filter has a function of splitting a signal having a wavelength band (X-band) with 1360 nm or less from a signal inputted into the common port through the pass port, while having a function of splitting a signal having a wavelength band (Y-band) with 1415 nm or more therefrom through the reflection port.
  • a filter for passing Y-band may be added between the first
  • the filter for passing Y-band may be embodied by an edge filter or a band-pass filter (BPF).
  • FIG. 23 illustrates a sixth embodiment of an apparatus for combining and splitting wavelength bands for bi-directional transmission according to the present invention illustrated in Fig. 2.
  • an apparatus for combining and splitting wavelength bands comprises a first CWDM filter for splitting Z-bands having a range of 1260 ⁇ 1280 nm and a range of 1300 ⁇ 1320 nm within X-band having 1360 nm or less from a wavelength band of light being transmitted; a second CWDM filter for splitting Z-bands having the range of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm within X-band having 1360 nm or less from the wavelength band of light being transmitted; and an edge filter for splitting X- band having 1360 nm or less and Y-band having 1415 nm or more within the wavelength band of light being transmitted.
  • a reflection port of the first CWDM filter is connected to a reflection port of the edge filter, while a pass port of the first CWDM filter is connected to a pass port of the second CWDM filter.
  • a reflection port of the second CWDM filter is connected to a common port of the edge filter.
  • FIG. 24 illustrates a first alternative embodiment of an apparatus for combining and splitting wavelength bands according to the sixth embodiment of the present invention illustrated in Fig. 23.
  • an apparatus for combining and splitting wavelength bands according to the first alternative embodiment of the sixth embodiment as illustrated in Fig. 24 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 23 so that each pass port of the first and the second CWDM filters in Fig. 23 is changed to a reflection port in Fig. 24, while each reflection port of the first and the second CWDM filters in Fig. 23 is changed to a pass port in Fig. 24.
  • each of the first and the second CWDM filters has a function of splitting a signal having a wavelength band (Z-band) with the range of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm from a signal inputted into the common port through the reflection port, while having a function of splitting a signal having a remaining wavelength band except Z-band through the pass port.
  • Z-band wavelength band
  • FIG. 25 illustrates a second alternative embodiment of an apparatus for combining and splitting wavelength bands according to the sixth embodiment of the present invention illustrated in Fig. 23.
  • an apparatus for combining and splitting wavelength bands according to the second alternative embodiment of the sixth embodiment as illustrated in Fig. 25 illustrates a case that the functions of the pass port and the reflection port of the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 23 so that the pass port of the edge filter in Fig. 23 is changed to a reflection port in Fig. 25, while the reflection port of the edge filter in Fig. 23 is changed to a pass port in Fig. 25.
  • the edge filter outputs a signal having a wavelength band (X-band) with 1360 nm or less through the reflection port, while outputting a signal having a wavelength band (Y-band) with 1415 nm or more through the pass port.
  • FIG. 26 illustrates a third alternative embodiment of an apparatus for combining and splitting wavelength bands according to the sixth embodiment of the present invention illustrated in Fig. 23.
  • an apparatus for combining and splitting wavelength bands according to the third alternative embodiment of the sixth embodiment as illustrated in Fig. 26 illustrates a case that the functions of the respective pass ports and the respective reflection ports of the first and the second CWDM filters and the edge filter are switched each other in an apparatus for combining and splitting wavelength bands illustrated in Fig. 23 so that each pass port of the first and the second CWDM filters and the edge filter in Fig. 23 is changed to a reflection port in Fig. 26, while each reflection port of the first and the second CWDM filters and the edge filter in Fig. 23 is changed to a pass port in Fig. 26.
  • each of the first and the second CWDM filters has a function of splitting a signal having a wavelength band (Z-band) with the range of 1260 ⁇ 1280 nm and/or the range of 1300 ⁇ 1320 nm from a signal inputted into the common port through the reflection port, while having a function of splitting a signal having a remaining wavelength band except Z-band through the pass port.
  • the edge filter outputs a signal having a wavelength band (X-band) with 1360 nm or less through the reflection port, while outputting a signal having a wavelength band (Y-band) with 1415 nm or more through the pass port.
  • a filter for passing Y-band may be added between the first
  • the filter for passing Y-band may be embodied by an edge filter or a band-pass filter (BPF).
  • an apparatus for combining and splitting wavelength bands having three ports according to the present invention is comprised of a combination of three WDM filters (either two edge filters and one CWDM filter, or one edge filter and two CWDM filters), any skilled person on the art may understand fully that an apparatus for combining and splitting wavelength bands having three ports according to the present invention can be embodied by any one integral device having the same function as the combination of three WDM filters described above. Such a one integral device has an advantage that it is capable of minimizing an insertion loss through the three input and output ports, when compared with the combination of three WDM filters.
  • the ranges of X- band, Y-band, and Z-band used in an apparatus for combining and splitting wavelength bands according to the present invention described above is illustrative, the scope of the present invention is not intended to be limited to the specific ranges of X-band, Y- band, and Z-band.
  • an apparatus for combining and splitting wavelength bands according to the present invention is embodied by using wavelength-tunable WDM filters, each of which is capable of varying the ranges of X- band, Y-band, and Z-band depending on necessity.
  • a CWDM filter used in an apparatus for combining and splitting wavelength bands according to the present invention described above may have a function of splitting one or more Z-bands (Zl -band, Z2-band, ... etc.) so that it may expand a wavelength band to be combined and split additionally.
  • An apparatus for combining and splitting wavelength bands according to the present invention described above has a function of combining and splitting wavelength bands for new bi-directional transmission, while accommodating an existing wavelength band as it is, where the existing wavelength band is transmitted bi-directionally through a transmission path in a one-line. Accordingly, when applying apparatus for combining and splitting wavelength bands according to the present invention to an existing metro network or access network, it is possible to expand the existing metro network or access network for the purpose of upgrading.
  • Yl -band and Y2-band as bi-directional signal bands for a WDM-PON in bi-directional transmission signals of a TDM-PON where a wavelength band (X-band) with a range of 1260 - 1280 nm is used as an upstream signal, while a wavelength band (Zl-band) with a range of 1480 ⁇ 1500 nm is used as a downstream signal. Further, it is possible to add a wavelength band (Z2-band) with a range of 1550 ⁇ 1560 nm as wavelength band for a video overlay signal.
  • an added apparatus for combining and splitting wavelength bands according to the present invention can perform a function of combining and splitting new signals for bi-directional transmission, while simultaneously performing a function of upgrading an existing access network (i.e., a function of providing a service with a higher bandwidth by adding a WDM-PON).
  • an apparatus for combining and splitting wavelength bands according to the present invention is possible to increase flexibility and expansibility of an existing network, because an OLT of a new network may be added at CO or at any positions of the new network, depending on the positions of an apparatus for combining and splitting wavelength bands according to the present invention to be added.
  • An apparatus for combining and splitting wavelength bands having three input and output ports according to the present invention has the following advantages:
  • the present invention can be embodied at low costs and with a simple configuration so that it may function as the prior art add/drop multiplexers.
  • the present invention may combine a wavelength band having a certain range with or splitting it from an existing signal band so that high usability thereof can be accomplished in the present invention.
  • the present invention may be utilized as a device for upgrading and expanding an existing metro network or an existing access network so that performance of an optical communications system can be enhanced at low costs.
  • the present invention may increase flexibility and expansibility of an existing metro network or an existing access network.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

La présente invention concerne un appareil pour combiner et découper une bande de longueur d'ondes comportant trois ports entrée et sortie pour transmission bidirectionnelle. Cet appareil comporte deux filtres de multiplexage WDM (Wavelength Division Multiplexing), chacun d'entre eux découpant la bande X correspondant à la plage d'une première longueur d'ondes ou moins et la bande Y correspondant à une plage d'une deuxième longueur d'ondes ou plus à partir d'une bande de longueur d'ondes de lumière en cours d'émission par l'intermédiaire des trois ports d'entrée et sortie. L'appareil comporte en outre un filtre WDM pour découper une ou plusieurs bandes Z correspondant à une place d'une troisième longueur d'ondes dans les limites soit de la bande X correspondant à la place de la première longueur d'ondes ou moins, soit de la bande Y correspondant à la place de la deuxième longueur d'ondes ou plus.
PCT/KR2007/000255 2006-10-31 2007-01-16 Appareil pour combiner et découper une bande de longueur d'ondes comportant trois ports entrée et sortie WO2008054045A1 (fr)

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KR10-2006-0106159 2006-10-31
KR20060106159 2006-10-31
KR1020060130914A KR100801329B1 (ko) 2006-10-31 2006-12-20 세 개의 입출력 단자를 구비한 파장 대역 결합 및 분리장치
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EP2424140A1 (fr) * 2009-04-21 2012-02-29 ZTE Corporation Multiplexeur par répartition en longueur d'onde compatible avec deux types de réseaux optiques passifs
WO2014124950A1 (fr) 2013-02-14 2014-08-21 Glaxo Group Limited Nouvelle composition
WO2019115601A1 (fr) 2017-12-15 2019-06-20 Glaxosmithkline Consumer Healthcare (Uk) Ip Limited Nouvelle composition
CN110412693A (zh) * 2019-08-02 2019-11-05 深圳市飞宇光纤系统有限公司 一种小型化单纤双透无源光学模块
KR20210141872A (ko) * 2020-05-14 2021-11-23 주식회사 론텍 다양한 싱글밴드 ｃｗｄｍ 패스 필터를 이용하여 구현된 듀얼 밴드 ｃｗｄｍ 패스 필터 모듈

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US20020081064A1 (en) * 2000-12-22 2002-06-27 Yongzhang Leng Bidirectional WDM optical communication system with bidirectional optical service channels
US20030138252A1 (en) * 2002-01-18 2003-07-24 Reza Paiam WDM cross-connects for core optical networks
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US20020081064A1 (en) * 2000-12-22 2002-06-27 Yongzhang Leng Bidirectional WDM optical communication system with bidirectional optical service channels
US20030138252A1 (en) * 2002-01-18 2003-07-24 Reza Paiam WDM cross-connects for core optical networks
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Publication number Priority date Publication date Assignee Title
EP2424140A1 (fr) * 2009-04-21 2012-02-29 ZTE Corporation Multiplexeur par répartition en longueur d'onde compatible avec deux types de réseaux optiques passifs
EP2424140A4 (fr) * 2009-04-21 2013-04-24 Zte Corp Multiplexeur par répartition en longueur d'onde compatible avec deux types de réseaux optiques passifs
US8655174B2 (en) 2009-04-21 2014-02-18 Zte Corporation Wavelength division multiplexer compatible with two types of passive optical networks
WO2014124950A1 (fr) 2013-02-14 2014-08-21 Glaxo Group Limited Nouvelle composition
WO2019115601A1 (fr) 2017-12-15 2019-06-20 Glaxosmithkline Consumer Healthcare (Uk) Ip Limited Nouvelle composition
CN110412693A (zh) * 2019-08-02 2019-11-05 深圳市飞宇光纤系统有限公司 一种小型化单纤双透无源光学模块
KR20210141872A (ko) * 2020-05-14 2021-11-23 주식회사 론텍 다양한 싱글밴드 ｃｗｄｍ 패스 필터를 이용하여 구현된 듀얼 밴드 ｃｗｄｍ 패스 필터 모듈
KR102426671B1 (ko) 2020-05-14 2022-07-29 주식회사 론텍 다양한 싱글밴드 ｃｗｄｍ 패스 필터를 이용하여 구현된 듀얼 밴드 ｃｗｄｍ 패스 필터 모듈

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