WO2007064240A1 - Multiplexeur optique a canaux multiples d'entree/sortie a fonctionnalite dynamique - Google Patents

Multiplexeur optique a canaux multiples d'entree/sortie a fonctionnalite dynamique Download PDF

Info

Publication number
WO2007064240A1
WO2007064240A1 PCT/RU2005/000609 RU2005000609W WO2007064240A1 WO 2007064240 A1 WO2007064240 A1 WO 2007064240A1 RU 2005000609 W RU2005000609 W RU 2005000609W WO 2007064240 A1 WO2007064240 A1 WO 2007064240A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
output
input
stage
channels
Prior art date
Application number
PCT/RU2005/000609
Other languages
English (en)
Russian (ru)
Other versions
WO2007064240A8 (fr
Inventor
Vyacheslav Konstantinovich Sakharov
Original Assignee
Nechaev, Alexandr Vladimirovich
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.)
Filing date
Publication date
Application filed by Nechaev, Alexandr Vladimirovich filed Critical Nechaev, Alexandr Vladimirovich
Priority to PCT/RU2005/000609 priority Critical patent/WO2007064240A1/fr
Publication of WO2007064240A1 publication Critical patent/WO2007064240A1/fr
Publication of WO2007064240A8 publication Critical patent/WO2007064240A8/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0213—Groups of channels or wave bands arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]

Definitions

  • the invention relates to fiber-optic communication systems with spectral channel multiplexing, in particular, to multi-channel reconfigurable and controlled optical channel I / O multiplexers (hereinafter t-OADM and ROADM) and can be used both in dense spectral multiplexing (DWDM) systems and moderate spectral multiplexing (CWDM).
  • t-OADM and ROADM multi-channel reconfigurable and controlled optical channel I / O multiplexers
  • DWDM Dense spectral multiplexing
  • CWDM moderate spectral multiplexing
  • DWDM technologies are characterized by extremely high bandwidth, but are very expensive.
  • the standard for the grid of wavelengths introduced by the International Telecommunication Committee (hereinafter ITU-Standard), provides for the spectral interval between channels 200, 100, 50 or 25 GHz.
  • ITU-Standard The recommended ITU-Standard spectral spacing between channels for CWDM systems is 20 im. CWDM is easier to use and cheaper than DWDM.
  • optical input / output multiplexers (hereinafter OADM) are used for channel input / output. They allow you to remove one or more channels from the line and simultaneously enter a signal at the same wavelengths with new information, and the efficiency of using communication systems is increased. Moreover, the number of input / output channels is usually significantly less than the total number of channels in the line.
  • Multichannel OADMs have, as a rule, fixed I / O channel frequencies.
  • Systematically increasing bandwidth requirements for communication systems require more flexibility, in particular, the use of reconfigurable and managed multi-channel OADMs.
  • These devices other than use in optical communication networks may have other applications, for example, in multi-channel sensor systems, for optical filtering, in analog systems for various purposes.
  • ROADM reconfigurable OADM
  • t-OADM managed OADM
  • the approach to the problem of creating ROADM consists in using a pair - a demx multiplexer of the “lxK” configuration and a multiplexer of the “Kxl” configuration, the outputs and inputs of which are connected and form K paths (K is the total number of channels in the system).
  • An optical electromechanical switch (hereinafter MEMS) is installed in each of the tracks.
  • the specified optical demultiplexer divides the optical signal into K channels and directs each channel to one of the K paths.
  • MEMS pass part of the channels to the optical multiplexer, and the other part of the channels are sent to the output ports.
  • the specified optical multiplexer combines all channels, including newly introduced using the same MEMS, and returns them to the optical line. Obviously, if implemented using this approach, the device would have a high cost, the greater the greater the number of channels K and the smaller the spectral interval between adjacent channels.
  • the period of the diffraction grating can vary within certain limits: be equal to or not equal to the wavelength of one of the K channels, and, therefore, using such OADM channel input / output with an appropriate wavelength may or may not be made.
  • the channels are separated by an optical demultiplexer into L subsets, in each subset P channels with intervals between the channels L- ⁇ v.
  • any given channels can be output. All other channels, together with newly introduced channels at the frequencies of the output channels, are combined using an optical multiplexer and enter the optical line.
  • the aim of the present invention is to provide a multi-channel OADM with dynamic functionality, which in different versions can be used as a multi-channel ROADM or as a multi-channel t-OADM.
  • the device should be simpler in the design solution than the known approaches suggest, satisfy the existing requirements for channel isolation and introduced dispersion, and be suitable for integrated optical performance. Whenever possible, the device should be as dynamic and flexible as possible for use in a wide variety of WDM systems.
  • the task was to develop a device for input / output of multiple channels from an optical signal with spectral channel multiplexing using controlled dynamic tuning of the filtering bandwidth.
  • the problem was solved by creating a multi-channel controlled optical input / output multiplexer with dynamic functionality for a fiber-optic communication system with spectral multiplexing of 2 N channels at N
  • - a controlled optical input / output multiplexer that provides the output of 2 m channels to one output port and the input of new 2 m channels at the carrier frequencies of the output channels to one output port;
  • the multichannel multiplexer be adapted to control the input / output of the channels in a reconfigurable mode, while these optical demultiplexer and multiplexer have fixed spectral characteristics and the controller is electrically connected to the specified controlled optical input / output multiplexer.
  • the multichannel multiplexer be adapted to control the input / output of channels in a tunable mode, while these optical demultiplexer and multiplexer have tunable spectral characteristics and the controller is electrically connected to these controlled optical input / output multiplexer, optical demultiplexer and multiplexer.
  • the indicated optical demultiplexer in the indicated M-stage structure one of the inputs of the optical filter of the first stage is connected to the input port, each of the two outputs of the optical filter of the last stage is connected to one of their output ports and optical filters in each stage, except the last, each of their two outputs were connected to the input of one of the optical filters of the next stage.
  • the specified optical multiplexer in the indicated M-stage structure two inputs of the optical filters of the first stage are connected to the input ports, one output of the optical filter of the last stage is connected to the output port and optical filters in each stage, except the first and last, were connected by each of the two inputs with the output of one of the optical filters of the previous stage, and with one output - with one of the inputs of one of the optical filters of the next stage.
  • single-stage and / or two-stage and / or multi-stage asymmetric Mach-Zehnder interferometers be used as the indicated optical filters.
  • optical filters contain electro-optical or thermo-optical phase shift devices to control the adjustment of transmission coefficients.
  • the multichannel multiplexer was made by integrated-optical technology on a single chip.
  • the input port, output port, M output ports and M input ports in the multi-channel multiplexer are made using optical fibers.
  • Fig.l is a diagram of a single-stage MZI
  • FIG. 1B is a schematic representation of a single-stage MZI shown in FIG. IA;
  • Figa is a diagram of a two-stage MZI
  • Fig.2B conditional image of a two-stage MZI shown in Fig.2A
  • Fig.ZA is a diagram of a multi-stage MZI used for dividing channels into odd and even ones;
  • Fig.ZB conditional image of a multi-stage MZI shown in Fig.ZA;
  • Figa is a diagram of a multi-stage MZI for combining odd and even channels
  • Fig. 4B is a schematic view of the multi-stage MZI shown in Fig. 4A;
  • 5A is a diagram of a t-OADM controlled optical input / output multiplexer
  • Fig. 5B is a schematic illustration of the t-OADM controlled optical input / output multiplexer shown in Fig. 5A;
  • Fig. BA is a diagram of a controlled optical demultiplexer t-Demux
  • FIG. 6 is a conditional image of a controlled optical demultiplexer t-Demuh shown in Fig.ba;
  • 7A is a diagram of a t-Mux controlled optical multiplexer
  • Fig. 7B is a schematic illustration of a controlled optical t-Mux multiplexer shown in Fig. 7A;
  • Fig. 8 is a diagram of a multi-channel OADM with dynamic functionality according to the invention used in a reconfigurable input / output mode using t-OADM and an optical demultiplexer and a multiplexer with fixed spectral characteristics;
  • Fig. 9 is a diagram of a multi-channel OADM with dynamic functionality according to the invention used in a controlled input / output mode using t-OADM, t-Demux and t-Max.
  • a key element for functional devices that are part of a multi-channel OADM with dynamic functionality is an asymmetric Mach-Zehnder interferometer or, as they agreed to call it, a single-stage MZI.
  • a single-stage MZI can be performed using various components and technologies, including using fiber optic splitters, beam splitters, prism mirrors, polarizers and other elements.
  • the best option for multi-channel OADM with dynamic functionality according to the present invention is a single-stage MZI in planar design.
  • FIG. IA is a schematic representation of a waveguide version of a single-stage MZI 10, its conditional image is shown in Fig.lB.
  • the device 10 is placed on one substrate 11, where the cascaded MZI 12 itself is formed by two arms 12-1 and 12-2 located between the first 13 and second 14 splitters, formed by waveguides of unequal length Ii and I 2 , respectively.
  • the coupling coefficients ki and k 2 of the splitters 13 and 14 are equal and divide the optical power in a ratio of 50/50.
  • the one-stage MZI 10 has conclusions a and b on the one hand and conclusions c and d on the other hand.
  • the single-stage MZI 10 in the arm 12-2 contains a phase shift device 15 that introduces an additional phase shift ⁇ into the phase of the traveling wave and is a controllable element used to adjust the spectral characteristics.
  • phase shift device 15 can be manufactured using a thermo-optical material, for example, silicone, or an electro-optical material, for example, lithium niobate (LiNbO3) or gallium arsenide.
  • thermo-optical material for example, silicone
  • electro-optical material for example, lithium niobate (LiNbO3) or gallium arsenide.
  • phase shift devices are known in the spectral densification technique as a tool for tuning the spectral characteristics of optical filters based on the IMC, and are also used in other devices - modulators and switches.
  • the light intensity at the two output ports c and d can be expressed using the transmission coefficients K ac (v, ⁇ ) and K ad (v, ⁇ ):
  • K ad (v, ⁇ ) 0.5- [l + cos (+ ⁇ + ⁇ )] s, (4)
  • D 2 ⁇ n ⁇ Lv / c is the phase delay due to different optical lengths of the arms 12-1 and 22-2;
  • ⁇ L Ii - 1 2 ;
  • p is the refractive index of the material;
  • v is the optical frequency and c is the speed of light in the void.
  • the light intensity at the same output ports c and d can be represented using the transmission coefficients Kb c (v, ⁇ ) and K bd (v, ⁇ ):
  • the transmission coefficients (1) ⁇ (4) become the spectral characteristics of a single-stage MZI.
  • the spectral characteristics (1) ⁇ (4) are periodic functions of the frequency of light v (and wavelength ⁇ ), the difference in arm lengths ⁇ L, refractive index n, and phase shift ⁇ .
  • a single-stage MZI is a reversible device.
  • the signals are divided into two groups, which are output to different outputs.
  • One group contains odd channels
  • the other group contains even channels
  • the spectral interval between channels becomes twice as large as at the input of a single-stage MZI.
  • the distance between adjacent extrema ⁇ v (or ⁇ ) in the spectral characteristics for a real single-stage MZI should be formed at the stage of its manufacture by selecting the corresponding difference of the arm lengths ⁇ L and the refractive index p.
  • the controlled adjustment of the position of the extreme values of the transmission coefficients relative to the given frequencies ⁇ v; ⁇ ( or wavelengths ⁇ ; ⁇ ) should be performed using the appropriate adjustment of the phase shift ⁇ when using an optical filter as part of any particular device Twa.
  • the lack of spectral characteristics of a single-stage MZI is nonplanar peaks and slowly falling edges of the spectral bands, which, with a small spectral interval between channels, can cause crosstalk between adjacent channels.
  • Another known disadvantage is that with a large difference in the lengths of the arms AL, the introduced dispersion can be very large. These flaws limit the possibility of using single-stage MZIs in devices used in communication systems with spectral channel multiplexing.
  • a significant improvement in the spectral characteristics of the optical filter for devices and systems for spectral multiplexing is provided, as is known (US, 6782158, B), with two-stage MZIs, which can be performed using fiber optic splitters, beam splitters, prism mirrors, polarizers, and planar form, and at the same time contain phase shift devices.
  • figa shows a schematic representation of the waveguide version of the two-stage MZI 20, its conditional image is shown in figb. It uses three splitters 21, 22 and 23 with coupling coefficients k lz k 2 and k 3 , respectively, forming two single-stage MZIs 24 and 25.
  • the device 20 is placed on a single substrate 26.
  • the first single-stage MZI 24 is formed by two waveguides 24-1 and 24-2 of unequal length I 24- I and I 24-2 , respectively.
  • the second single-stage MZI 25 is formed by two waveguides 25-1 and 25-2 of unequal length I 25-I and I 25-2 , respectively.
  • MZIs 24 and 25 use phase shift devices 27 and 28, the phase shifts introduced by them are ⁇ and f, respectively.
  • the two-stage MZI has conclusions a and b on the one hand and conclusions e and / on the other hand.
  • M (v, ⁇ , ⁇ ) T ⁇ k g ) T (D g ) T (k 2 ) T (D x ) T (k x ) (8) Mi with M bd ⁇
  • a two-stage MZI used as an optical filter provides better crosstalk suppression and high channel isolation. Nevertheless, the introduced dispersion of the two-stage MZI remains large, and therefore its use as a filter in communication systems with a high data transfer rate is limited.
  • FIG. 3A shows one of the variants of the multi-stage MZI 30, which can be used to separate the odd and even channels; conditional image of a multi-stage MZI is shown in Fig.ZB.
  • the device 30 in planar execution is placed on one substrate (crystal) 31 and includes three complementary two-stage MZIs: the first stage uses a two-stage MZI 32 type I, and in the second stage two two-stage MZIs 33 and 34, both types G, respectively, with the other sign of variance.
  • On figa shows one of the variants of the multi-stage MZI 40, which can be used to combine the odd and even channels; conditional image of a multi-stage MZI is shown in Fig.4B.
  • the entire device 40 in planar execution is placed on one substrate (crystal) 41 and includes three two-stage MZIs: in the first cascade two two-stage MZIs 42 and 43 are used, both types I 3 and in the second cascade - two-stage MZI 44 of type G, respectively, with the opposite sign of dispersion.
  • the MZI 42 and 43 When entering the odd and even channels, respectively, through the external ports z and w, the MZI 42 and 43 simply pass one odd and the other even channels to their output ports / The channels are combined using MZI 44, and as a result, the odd and even channels to external port v. Since the dispersion of the two-stage MZI 42 and 43 and each of the two-stage MZI 44 have opposite signs, this ensures zero or almost zero dispersion of the entire device 40.
  • FIG. 5A A diagram of one embodiment of the used controlled optical I / O multiplexer 50 is shown in Fig. 5A, its conditional image in Fig. 5B.
  • the device 50 (hereinafter referred to as t-OADM 50) is a three-stage structure and has an input port “In”, an output port “Out”, an output “Drop” port, an input “Add” port and includes three optical filters 51-1, 51- 2 and 51-3.
  • the multiplexer further comprises an optical adder 52 having 4 inputs “1” ⁇ “4” and one output ⁇ . All three filters 51-1, 51-2 and 51-3 and the adder 52 are integrated on a single substrate 53. Connections of the filters are performed by waveguides 54.
  • Dynamic control of the operation of the controlled input / output multiplexer 50 is carried out by tuning the spectral characteristics of the three filters 51-1, 51-2, and 51-3 when all three filters of the corresponding voltages are applied to the phase-shift devices. Management is carried out using an external controller (not shown in the drawing), which is connected to the optical filters with an electric bus 55.
  • optical filters 51-1, 51-2 and 51-3 are connected in series with each other so that the output of one is connected to the input of the other, the second output of each filter is connected to one of the inputs of the optical adder, the input of the first filter 51-1 is connected to the input port “In”, the output of the last filter 51-3 is connected to the output port “Drop”, the optical adder 52 is connected to the input port “Add” by another input, and the output to the output port “Out”.
  • the operation of t-OADM 50 in these phases ⁇ * n ⁇ and ⁇ f * n ⁇ occurs as follows.
  • the optical filter 51-1 of the first stage divides the channels entering the input port "In" into two groups - a group of odd waves V 1 , V 3 , V 5 and V 7 , which are directed to the optical filter 51-2 of the second stage, and the group even waves V 2 , V 4 , V 6 and Vg, which are directed to the optical adder 52.
  • the optical filter 51-2 again divides the waves and directs the waves v3 and V 7 to the optical filter 51-3 of the third stage, and the waves V 1 and V 5 to the adder 52; the third optical filter 51-3 divides the two waves v 3 and V 7 coming to it.
  • the V 3 wave is released, which passes to the Drop output port, and all the other 7 waves go to the three inputs of the adder 52 and with its help are in the Out port.
  • the wave v " 3 introduced through the port" Add ", is fed to the fourth input of the adder and also appears in the output port 52.
  • the functional device used as t-OADM in the present invention may differ from t-OADM 50 by the number of steps N 1 in the multi-stage structure, the spectral interval between adjacent channels at the input Av 1 8 * , and the type of optical filters used.
  • the distances between adjacent extrema in the spectral characteristics should be set as follows:
  • the free dispersion region which plays an important role in the present invention.
  • the spectral characteristics of optical devices can be cyclically repeated over a wide spectral range.
  • the repetition period, or the spectral range F, within which there is no cyclic repetition of the characteristics is called the region of free dispersion.
  • the free dispersion region F is:
  • t-Demux 60 The scheme of the used controlled optical demultiplexer 60 (hereinafter referred to as t-Demux 60) according to the present invention is shown in Fig. BA, a conditional image of it is shown in Fig. Bb.
  • t-Demuh 60 also has a three-stage structure of the “tree” type.
  • the first optical filter 61 (the first stage of the multi-stage structure) is connected with its output ports to the next two - optical filters 62-2 and 62-3 (second stage), which in turn are connected by their output ports to the following four optical filters 63-1, 63 -2, 63-3 and 63-4 (third stage).
  • the whole device is made on one substrate (crystal) 64.
  • ⁇ Demux port is used as input, eight Cl ⁇ CS ports - for individual output of channels.
  • the optical filters of all three levels are connected by waveguides 65 formed on the substrate. Dynamic control of the operation of the controlled demultiplexer 60 is carried out by tuning the spectral characteristics of the optical filters when applying phase shift devices contained in all the filters, the corresponding voltages. Management is carried out using an external controller (not shown in the drawing), which is connected to the optical filters with an electric bus 66.
  • the spectral intervals between the channels become two times wider.
  • the spectral interval between the channels is minimal, for filters 63-1 ⁇ 63-4 of the third stage, on the contrary, the maximum and for filters 62-1 and 62-2 of the second stage, the spectral interval is intermediate. Therefore, the requirements for the characteristics of the filters are different.
  • the following can be used: in the first stage - multi-stage MZI (Fig. 3A), in the second stage - two-stage MZI (Fig. 2A) and in the third - single-stage MZI (Fig. IA).
  • the t-Demux 60 functions as a traditional demultiplexer with fixed channel frequencies.
  • the multistage MZI 61 divides the channels (waves) into odd v l5 v 3 , V 5 and V 7 and even v 2 , v 4 , v 6 and V 8 , which are sent to the two-stage MZI 62-1 and 61-2.
  • the two-stage MZIs 62-1 and 61-2 divide again the waves arriving to them, while the two-stage MZIs 62-1 directs the waves V 1 and V 5 to the single-stage MZIs 63-1 and the waves v 3 and V 7 - to the single-stage MZIs 63-2 and the two-stage MZI 62-2 directs the waves V 2 and V 6 to the single-stage MZI 63-3 and the waves V 4 and V 8 - to the single-stage MZI 63-4.
  • all the waves are completely separated and displayed individually on separate ports in accordance with the table. one.
  • phase changes ⁇ * n ⁇ and ⁇ * n ⁇ should be made in accordance with expression (10).
  • ⁇ 6 i - ⁇ / 8
  • ⁇ 62-2 - ⁇ / 16
  • the third functional device 70 has an opposite purpose to the functional device 60 and is used to combine channels.
  • the two functional units 60 and 70 intended for the multi-channel OADM with dynamic functionality discussed below, must be compatible.
  • the inputs of the functional device 70 must be supplied with channels whose carrier frequencies coincide with the frequencies of the channels at the outputs of the functional device 60, and the spectral interval between the channels should be like that of t-Demuh 60.
  • the scheme of the used controlled optical multiplexer (hereinafter - t-Mux 70) according to the present invention is shown in Fig.7A, a conditional image of it is shown in Fig.7B.
  • t-Mux 70 is a multi-stage structure of the "tree" type on seven optical filters.
  • optical filters 71-1 ⁇ 71-4 comprising the first stage of a multi-stage structure, are connected with their output ports to two subsequent optical filters 72-1 and 72-2, comprising a second stage, which in turn are connected by their output ports to another optical filter IMC 73, which is the third stage.
  • the entire device is made on the same substrate 74.
  • the ⁇ m ux port serves as a common output port.
  • the optical filters of all three levels are connected by waveguides 75 formed on a substrate 74.
  • Dynamic control of t-Mux 70 operation is carried out by tuning the spectral characteristics of seven optical filters when applying phase shift devices contained in all optical filters corresponding to the voltage. Management is carried out using an external controller (not shown in the drawing), which is connected to the optical filters with an electric bus 76.
  • t-Mx 70 As the optical signal passes from one stage to the next stage, the spectral intervals between the channels become two times narrower. For the optical filters 71-4 ⁇ 71-4 in the first stage, the spectral interval between the channels is maximum; for the optical filter 73, on the contrary, is the minimum. Therefore, the requirements for the characteristics of the optical filters used in the corresponding steps are different.
  • optical filters in this example can be used: in the first stage - single-stage MZI (Fig. IA), in the second stage - two-stage MZI (Fig. 2A) and the third - multistage MZI (Fig. 4A).
  • the design of the t-Mx 70 differs from that described by the t-Dem 60 only by the used multi-stage MZIs: in one case it is multi-stage MZIs (Fig. 3A), and in the other case it is multi-stage MZIs (Fig. 4A).
  • the channel combining process performed using the t-Mx 70 is the reverse of the channel separation process discussed above in t-Demx 60.
  • the design of the t-Mux configuration “2 m xl” in the form of a multi-stage tree-like structure of optical filters can differ from the t-Mux 70 in the number of steps M, the spectral interval between adjacent channels at the Av TM x output, and the type of optical filters used.
  • n optical filters 3 -oy stage at nz l, 2, ... M distances between adjacent extremums in spectral characteristics to be installed ravnmi
  • FIG. 1 A diagram of one embodiment of a multi-channel OADM with dynamic functionality according to the invention is shown in FIG.
  • the multi-channel OADM 80 with dynamic functionality is based on the t-OADM described above (FIG. 5A).
  • This device, designated 81-1, has a free dispersion region 8 times smaller than the spectral range of the optical signal at the input.
  • a couple of devices are also used: the optical demultiplexer 81-2 of the configuration “1x8” and the optical multiplexer 81-3 of the configuration “8x1”.
  • Both devices demultiplexer 81-2 and multiplexer 81-3 have fixed spectral characteristics and can be selected from the existing range of such devices or specially manufactured.
  • Three multiplexer devices 81-1, 81-2, and 81-3 are connected by optical fibers 82, while the output port “Dror” and the input port “Add” t- ⁇ are connected to the input ⁇ Demux of the optical demultiplexer and the output of ⁇ m ux of the optical multiplexer, respectively.
  • the input port 83 and the output port 84 are made in the form of optical fibers and are connected, respectively, to the ports "In" and "Out" t-OADM.
  • Eight output ports 85-1 ⁇ 85-8 are connected to the outputs Cl ⁇ C8 of the optical demultiplexer, and eight input ports 86-1 ⁇ 86-8 are connected to the inputs Bl ⁇ B8 of the optical multiplexer.
  • the output ports 85-1 ⁇ 85-8 and input 86-1 ⁇ 86-8 are also made in the form of optical fibers.
  • the device 80 also contains a controller 87, from which control voltages ⁇ £ / t- o AD m ⁇ are supplied to the t-OADM control elements via an electric bus 88.
  • a specific combination of channels is specified by control voltages ⁇ £ ⁇ - ⁇ ⁇ DM ⁇ - All other channels go to output port 84.
  • Eight channels from the "Dror" port of the device 81-1 are fed to the input of the optical demultiplexer 81-2, with which the channels are output separately from each other to the output ports 85-1 ⁇ 85-8.
  • the optical multiplexer 81-3 instead of the output channels using the optical multiplexer 81-3 can be introduced a new 8 channels.
  • any of 8 combinations of channels can be entered / withdrawn.
  • FIG. 9 A diagram of another embodiment of a multi-channel OADM with dynamic functionality according to the invention is shown in Fig.9.
  • This device is intended for use in an optical system with spectral multiplexing as t-OADM.
  • the multi-channel OADM 90 with dynamic functionality is built on t-OADM (Fig. 5A) and an optical demultiplexer and a multiplexer with tunable spectral characteristics, which use the t-Dem configuration “1x8” and t-configuration “8x1” discussed above (Fig. bA and Fig. 7A).
  • t- ⁇ 92-1 Three multiplexer devices in integrated optical design are placed on the same substrate 91: t- ⁇ 92-1, t-Demu ⁇ 92-2 configuration "1x8", and t- ⁇ ux 92-3 configuration "8x1". They are connected by waveguides 93 formed on a common substrate 91.
  • the output port "Dgar” and the input port "Add” t- ⁇ are connected to the input ⁇ D Canalmuh t-D Canalmuh 92-2 and the output ⁇ enthusiasm U ⁇ t- ⁇ u ⁇ 92-3 , respectively.
  • Multichannel OADM 90 with dynamic functionality has an input port 94, an output port 95, which are connected by waveguides to the ports "In” and "Out” t-OADM 92-1.
  • Eight output ports 96-1 ⁇ 96-8 are connected to the outputs C1 ⁇ C8 t- Demuh 92-2, and eight input ports 97-1 ⁇ 97-8 with inputs Bl ⁇ B8 t- ⁇ uh 92-3.
  • the device 90 also comprises a controller 98, from which control voltages ⁇ U 1 are supplied to the control elements of the three functional subsystems via an electric bus 99.
  • An input optical signal containing 64 channels is fed to the t-OADM 92-1 input.
  • Control voltages ⁇ £ ⁇ - OADM corresponding to the output to the “Drop” port of 8 channels out of 64 with frequencies ⁇ v v ⁇ in one of the combinations according to Table 1 are supplied to the same device. 2. All other channels go to output port 95.
  • Eight channels are fed to the input of the optical demultiplexer 92-2, through which the channels are output separately from each other to the output ports 96-1 ⁇ 96-8.
  • new 8 channels can be introduced.
  • any of 8 combinations of channels from the multi-channel OADM present at the input with the dynamic functionality of 64 channels with channel frequencies ⁇ v ⁇ can be introduced / removed.
  • the device 90 can also be used in the reconfigurable input / output mode of 8 channels, when it is necessary to output / input 8 preset channels from 64 channels with fixed channel frequencies. In this mode, the control voltages ⁇ U Dem ux ⁇ and ⁇ Um ux ⁇ must be set appropriately once, providing separation / association of channels with frequencies corresponding to the ITU-Standard.
  • the control of the output / input of 8 preset channels in this case should be carried out by appropriate changes only of the control signals ⁇ £ ⁇ - OADM ⁇ -
  • a multi-channel OADM with dynamic functionality intended for use as a ROADM or as t-OADM in any particular optical communication system may differ from the considered devices 80 and 90.
  • the parameters included in the composition of a multi-channel OADM with dynamic functionality of functional devices of three types are determined by the total number of channels in the optical system 2 N at N> 2, the spectral interval between adjacent channels ⁇ vschreib and the number of channels to be input / output 2 m (M is an integer the number and at the same time 1 ⁇ M ⁇ N.
  • M is an integer the number and at the same time 1 ⁇ M ⁇ N.
  • the infinity symbol “ ⁇ ” in two positions in table 3 corresponds to the fact that only one channel is output or input through the corresponding ports of these devices.
  • multichannel OADMs with dynamic functionality according to the invention can also have other applications, for example, in multichannel sensor systems, for optical filtering, in analog systems of various purposes.
  • the multi-channel OADM with dynamic functionality can be used in fiber optic lines and communication systems with spectral channel multiplexing, including in trunk communication lines where DWDM technology is used, and in regional, city and local communication systems where CWDM technology is used.
  • the multi-channel OADM with dynamic functionality according to the present can be implemented using existing integrated optical technologies.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

Cette invention concerne un multiplexeur d'insertion/extraction optique (OADM) à canaux multiples dynamiquement fonctionnel pour un système de communication à fibres optiques à multiplexage spectral de 2N canaux, N désignant un nombre entier ≥ 2, à un intervalle spectral Δν0 entre des canaux voisins, pour l'entrée/sortie de 2M canaux, M désignant un nombre entier conformément à 1≤M<N, lequel multiplexeur comporte un port d'entrée, un port de sortie, 2M ports de sortie, 2M ports d'entrée et comprend: un multiplexeur optique commandé (91-1) d'entrée/sortie assurant d'une part la sortie de 2M canaux dans un port de sortie (extraction) et d'autre part l'entrée de 2M nouveaux canaux sur des fréquences porteuses des canaux sortis dans un port d'entrée (insertion); un démultiplexeur optique (91-2) de configuration '1x2M' connecté par son port d'entrée (Σdemux) au port de sortie (extraction) dudit multiplexeur optique commandé (91-1) d'entrée/sortie; un multiplexeur optique (91-3) de configuration '2Mx1' connecté par son port de sortie (Σmux) au port d'entrée (insertion) dudit multiplexeur optique commandé (91-1) d'entrée/sortie; et une unité de commande (98). Le dispositif de cette invention peut être utilisé dans des systèmes de multiplexage par répartition en longueur d'onde dense (DWDM) et de multiplexage par répartition approximative en longueur d'onde (CWDM) sous la forme d'un multiplexeur optique reconfigurable ou commandé à canaux multiples d'entrée/sortie.
PCT/RU2005/000609 2005-11-29 2005-11-29 Multiplexeur optique a canaux multiples d'entree/sortie a fonctionnalite dynamique WO2007064240A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/RU2005/000609 WO2007064240A1 (fr) 2005-11-29 2005-11-29 Multiplexeur optique a canaux multiples d'entree/sortie a fonctionnalite dynamique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2005/000609 WO2007064240A1 (fr) 2005-11-29 2005-11-29 Multiplexeur optique a canaux multiples d'entree/sortie a fonctionnalite dynamique

Publications (2)

Publication Number Publication Date
WO2007064240A1 true WO2007064240A1 (fr) 2007-06-07
WO2007064240A8 WO2007064240A8 (fr) 2007-10-25

Family

ID=38092480

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2005/000609 WO2007064240A1 (fr) 2005-11-29 2005-11-29 Multiplexeur optique a canaux multiples d'entree/sortie a fonctionnalite dynamique

Country Status (1)

Country Link
WO (1) WO2007064240A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120103336A1 (en) * 2010-10-29 2012-05-03 General Electric Company Ventilator System and Method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002011339A2 (fr) * 2000-07-26 2002-02-07 Apa Optics, Inc. Multiplexeur, demultiplexeur et multiplexeur a insertion-extraction pour liaisons de telecommunications par fibres optiques monomodales
RU2204211C1 (ru) * 2001-12-13 2003-05-10 Александровский Михаил Исаакович Оптическая абонентская линия связи
US6602000B1 (en) * 1999-02-19 2003-08-05 Lucent Technologies Inc. Reconfigurable add/drop for optical fiber communication systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6602000B1 (en) * 1999-02-19 2003-08-05 Lucent Technologies Inc. Reconfigurable add/drop for optical fiber communication systems
WO2002011339A2 (fr) * 2000-07-26 2002-02-07 Apa Optics, Inc. Multiplexeur, demultiplexeur et multiplexeur a insertion-extraction pour liaisons de telecommunications par fibres optiques monomodales
RU2204211C1 (ru) * 2001-12-13 2003-05-10 Александровский Михаил Исаакович Оптическая абонентская линия связи

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120103336A1 (en) * 2010-10-29 2012-05-03 General Electric Company Ventilator System and Method

Also Published As

Publication number Publication date
WO2007064240A8 (fr) 2007-10-25

Similar Documents

Publication Publication Date Title
US20030035168A1 (en) Spectrum division multiplexing for high channel count optical networks
WO2007064242A1 (fr) Multiplexeur optique commande
WO2007064241A1 (fr) Multiplexeur optique commande d&#39;entree / sortie
JP4748524B2 (ja) アレイ導波路格子型合分波器
US7907844B2 (en) Method and apparatus for hitless routing of optical signals in an optical transport network
CA2332788C (fr) Unite de multiplexage/demultiplexage de longueur d&#39;onde, appareil de multiplexage/demultiplexage de longueur d&#39;onde et methode de multiplexage/demultiplexage
WO2007064238A1 (fr) Multiplexeur optique commande a canaux multiples d&#39;entree/sortie
RU2380837C1 (ru) Многоканальный оптический мультиплексор ввода/вывода с динамической функциональностью
RU2372729C1 (ru) Многоканальный управляемый оптический мультиплексор ввода/вывода
KR100845061B1 (ko) 파장 선택적 장치와 스위치 및 이에 관한 방법
JP4350044B2 (ja) 光スイッチ装置
WO2007064240A1 (fr) Multiplexeur optique a canaux multiples d&#39;entree/sortie a fonctionnalite dynamique
US6674937B1 (en) Optical wavelength routing circuits
US6785442B2 (en) Multi-order optical cross-connect
US20030174946A1 (en) Superstructure photonic band-gap grating add-drop filter
RU2390099C2 (ru) Управляемый оптический мультиплексор ввода-вывода
JP2014160216A (ja) マッハツェンダ干渉計型波長選択スイッチ
JP3832742B2 (ja) 光合分波装置
RU2389138C2 (ru) Управляемый оптический мультиплексор
RU2372728C1 (ru) Управляемый оптический демультиплексор
JP4238069B2 (ja) 光波長合分波装置
JP2784374B2 (ja) 光分岐挿入回路
JP2003304197A (ja) 波長多重分割回路
JP5731946B2 (ja) 波長選択スイッチ
CN114924357B (zh) 一种基于级联马赫-曾德干涉仪结构的波分复用光延时线

Legal Events

Date Code Title Description
DPE2 Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2005857410

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2008123178

Country of ref document: RU