TW484268B - Device for multiplexing/demultiplexing and method therewith - Google Patents

Abstract

A device for multiplexing a wavelength multiplexed optical signal (25) comprising at least a first and a second optical wavelength channel centered around respective predetermined wavelengths (λ1, λ2), comprising an MMI coupler (2), at least of the size 2x2, for inputting the wavelength multiplexed optical signal at an input (3) and for splitting the multiplexed signal into components and imaging these at several ports (13-21), Michelson waveguides (27-31) for receiving and transporting the components imaged at the port of the MMI coupler, reflecting means (33-41) for reflecting the components received and transported in the Michelson waveguides back to the ports of the MMI coupler, wherein the MMI coupler is arranged for inputting the reflecting components, and the respective lengths of the Michelson waveguides are adapted so that said MMI coupler combines the components in a manner such that the first and the second optical wavelength channels are imaged substantially at separated outputs (5-11).

Description

484268 V. Description of the invention (1) Technical scope The present invention relates to optical transmission technology, and in particular, to single-mode integrated optics for power communication and data communication. The invention particularly relates to a device for wavelength selective multiplexing / demultiplexing and a method thereof.背景 Background of the invention and related arts There are many different ways in the network to increase the capacity of optical fibers, which are known. One method involves using wavelength division multiplexing (WDM) to improve the use of bandwidth in the network. 'However, it is necessary to provide a device capable of multiplexing and demultiplexing transmission channels.' Rotation. New adjustable multiplexer file A using multi-pin Mach-Zehnder interferometer, see J.-P. Weber, published in StockhQln] 2

Proc · ECI0'97 EthE5, pages 272-275, 1997 discloses a MMIMZI device 1 (multi-mode interference Mach-Zehnder interferometer), which can be used for cyclic wavelength selective switching. C · K · Madsen, a multi-frequency band selector with low loss, flat passband and low crosstalk, published in Photon, Tech · Let ·, Vol. 10 (12), pages 1 766- 1 768, 1 99 8. It discloses a MMIMZI device showing a non-linear phase response in its M ach-Zehnder arm. WO 98/39686 and T. Augustsson, Bragg gitter assisted MMIMI 1 ¾ coupler for wavelength selection switching is published in Electron. Lett., Vol. 34 (25), pages 2 41 6-2 4 1 8, 1 99 8, this article Reveals a MMIMIBg device (Bragg gitter assisted multi-mode interference Michelson interferometer), which can provide complete individual switching. Generally, the problems with the above technologies include the long propagation path of light through the respective devices.

Page 6 484268 V. Description of the invention (2) The economy will cause great phase loss and instability. Home & Bit "C avoids eight and more, and it is necessary to adjust this high energy-consuming device (phase control). Κ μ… In addition, this known technology can cause channel crosstalk problems, so it is necessary to Quite complicated structure. Summary of the invention The object of the invention is to provide a device for demultiplexing a wavelength multiplexed optical signal comprising at least first and second optical wavelength channels, which can exhibit improved performance. In this respect A special object of the present invention is to provide a device that can exhibit a better filtering profile and lower channel crosstalk. Another / objective of the present invention is to provide a demultiplexing device that is more effective than the multiplexers known in the art. Other purposes of the present invention will become more apparent from the following description. According to the first characteristic of the present invention, the prepared device includes: (1) a MMI coupler 'with a size of at least 2x2 for receiving a wavelength multiplexed light 4§ number' which contains at least one wavelength channel at an output, And the signal used to separate the multiplex is each component, and will be imaged at several ports, (2) Michelson waveguides are used to receive and transmit the components of each port of the MMI coupler, and (3) the reflection device is used to The components received and transmitted at the Michels on waveguide are reflected back to the ports of the MMI coupler. % 11_ The coupler is still arranged to receive the reflected components, and the length of the Michelson waveguide can be adapted to enable the MMI coupler to combine various components. The first and second optical wavelength channels can be imaged at different outputs of the MM I coupler . Preferably, Michelson waveguides have different lengths and the lengths between the waveguides

Page 7 484268 V. Description of the invention (3) The difference is related to the wavelength channel distance. This device can also contain-or several phase adjustment devices 4 for the components received and transmitted in the phase-shaping M1Chelson waveguide. These phase trimming elements can include trimming π for permanent fine adjustment of the phase, and active phase control of the phase position. Operation 1 #: Outer << This device is ..., because it can work in the same way for multiple directions in the return direction. According to the second characteristic of the present invention, a device is provided for multiplexing one and the second optical wavelength channel. The device includes: (1) a Mm coupler with a size of at least 2 × 2 to receive the first and second signals at each input Optical wavelength channel, and components used to separate the channel into components, and imaged at several ports, (2) MiChelSon waveguide components used to transport imaging in each of the MMI couplers' and (3) reflection device to At the Michelson wave, the receiver receives and transports the ingredients | reflected back to each 槔 of the MMI_ combiner. The MMI coupler is still arranged to receive the reflected components. The length of the u ^ ^ ^ michelson waveguide can be adjusted in order. The 俾 MM I coupler can be combined into f ^ ^ to make the first and second optical wavelength channels. The sigma σ signal with a wavelength of 77 multiplexers can actually be imaged at a single output of the MMI_ coupler. According to a third feature of the present invention, a device is provided for light addition / removal multiplexing, and a device including the above-mentioned type is provided for multiplexing. 3 Preferably, the adding / removing multiplexing device includes a round-in waveguide and a light-multiplexing signal to a demultiplexer ’and contains at least a thin-lead waveguide for self-resolution.

Page 8 484268 Jade and invention description (4) The multiplexer outputs a demultiplexed channel for transmission, and the same / channel is input in the multiplexer, and at least one waveguide outputs a demultiplexer to output another solution. To remove the channel (removal function), and an output waveguide to output a signal of optical multiplexing. This signal contains the demultiplexed channel transmitted in the crossing waveguide and another signal is input to the multiplexer. In a specific example of the present invention, the demultiplexer and the multiplexer for adding / removing the multiplexing device have an active phase control element, and therefore, they can exhibit wavelength selection ^ tunability. Another object of the present invention is to provide a method for demultiplexing, including the following steps: (1) Input the optical signal of wavelength multiplexing at the second input of the MMI coupler, the size of which is at least 2x2, and divide the signal into For each component, imaging on the ports of the MEMS coupler, (2) input and transport the components of each imaging of the MMI coupler in the MiSon waveguide, (3) input and The transmitted components are reflected back to the ports of the MMI coupler at an appropriate distance from the MMI coupler, and U), and the reflected components are input and combined in the MMI coupler, so the first and first optical wavelength channels are at different outputs Imaging. The advantages of the present invention are mainly that the extension path of the step is very short ..., which can achieve the stability of light transmission. In addition, according to the present invention, there is a possibility of lower loss and improved performance. Something is: Capability 1 is used to establish and change more system tolerance characteristics, which has been technically described. Compared with known techniques, in exhibition techniques *, it uses linear phase response

Page 9 484268 V. Description of Invention (5) Application. Brief description of the drawings and reference to the attached drawings, the present invention will be described in more detail later. Only for illustration of the present invention and does not constitute a limitation. FIG. 1 illustrates one of the present invention and the y β β The example is a device for demultiplexing optical signals with multiple wavelengths and multiple wavelengths. Fig. 2 illustrates the different imitations in the device of Fig. 1 &gt; A Μ \\ a. For example, the j 15 component intensity distribution and phase relationship. Fig. 3 illustrates the selected reflection mechanism a% in the device of Fig. 1 Chirped Bragg grating. Fig. 4 illustrates another specific embodiment of the present invention, the light adding / removing device. Preferred Specific Examples The specific details described in the following description are for illustrative purposes only and are not limiting, such as special applications, techniques, methods, etc. to provide a thorough understanding of the present invention. It should be apparent to those skilled in the art that the present invention can be implemented with other specific examples, which examples may deviate slightly from these details. In the basin case, detailed descriptions of well-known methods, devices or circuits have been omitted, so that this description cannot be made unclear by unnecessary details. The present invention includes a new and innovative device for multiplexing / demultiplexing an optical signal. The device includes an MMI light coupler for separating the optical signal (in one direction), and for phase correlation (in the opposite Direction), ie, combined in the MUheison configuration. The reflection structure can be composed of a Bragg grating. The reflection structure can be adapted to achieve the separation between different components of each ideal wavelength.

484268 V. The phase relationship of invention description (6), which can combine different components and obtain the ideal multiplexing / demultiplexing function. The wavelength selection device may include the following basic components: Use Michelson waveguides or Michelson arms to implement an interference component for filters, couplers and modulators. An MMI waveguide structure (MMI, multi-mode interference) is used to separate light. This theory can be found in LBSoldano &amp; ECMPennings, Optical Multi-Mode Int erference Devices Based on Self-Imaging: Principles and Applications, J. Lightwave Technol., Vol. 13 (4), pages 615-627 , 1995, and its reference. The MMI separation of light can migrate into multiple images of intensity distribution. The length / width ratio of the MMI structure can control the number of images in its output. The output has a certain determined phase relationship, depending on which input the light is excited to. Filter and reflect light with a Bragg grating. The filter profile can be adjusted by the intensity, length, and variable period (grating wavelength) of the grating, the so-called chirp pulse. The intensity and duration can be changed in the direction of light transmission. This change in intensity is called Apodization. In the present invention, a Bragg grating type is used, which can reflect a wide frequency band (many wavelength channels). This grating can use the strength of extremely strong gratings or chirp pulse gratings to achieve a non-linear phase response to obtain a filter profile with more system tolerance. For a more extensive description of the wavelength-demultiplexed Bragg grating, see Phase-shifted Dmul Fiber Gitters &amp; their Application for Wavelength Demultiplexing by G.P.Agrawal &amp; S.Radic, IEEE Photon · Tech · Let ·, Vol.

484268

V. Description of the Invention (7) 6 (8), 995-997 pages, 1994, August edition. Need a phase replacement ^ r 4 for ... performance and (this phase: the basic characteristics of the two components is # = ^ f ^ imperfect when set ° phase control m is the path length can be externally added signal (electrical LI uses the element: 'Purpose' affects (controls) the most phase ... (light path length). Refractive index of the tube towel. _Received film: Affected by the wave-like way, that is, inverse $ 敫) 5 ^ r2, / aIf adjustment is urgently needed, UV-trimming (permanent adjustment) can be implemented, at least for the material system Si〇2 / Sl.

Referring to FIG. 1 ', a device 1 (also referred to as an IMJ demultiplexer 7MIMI, a multi-mode interference ΜΙχ} ^ 解 3〇η interferometer) is used to explain the optical signal of multiplexing and one-wavelength evening work, to illustrate the present invention. The first specific example. This device contains a 5x5MM1 structure 2 'which has five ports 3, 5, 7, 9, 1 1 on the first side or interface a and five ports 13, 15, 17, 19 on the opposite second side or interface β. , twenty one. Chun 3 is an input port for inputting a wavelength-multiplexed optical signal 25 into a waveguide 23 called an access waveguide. The signal includes four wavelengths focused on the wavelengths of people 丨, people 2, and people; 3 and λ *. Channel.

The MMI coupler 2 has a length / width ratio, so an appropriate number of images (five in this embodiment) entering the light distribution can be achieved on the interface B. The approximate formula for the ratio of the NxNMM I coupler is as follows: L = (M / N) (4nW2 / λ), where L is the length of the MMI waveguide, W is its effective width, and it is the wavelength of light (wavelength The central wavelength of the multiplexer), η is the effective coefficient of the MM I waveguide (MMI waveguide coefficient, such as the conversion from 3D to 2D), and N is the number of images

Page 12 484268 V. Description of Invention (8), M is an integer (usually chosen as 1). For details, please refer to the above Solano and Pemmimgs text. In this specific example, the design of the MMI splicer 2 allows five images of the entry signal 25 to be created at the respective bees 1 3, 1 5 1 7, 19, 21. Figure 2 shows the normalized intensity distribution and radial phase distribution (dotted line, short line) in a random unit (dashed line) as a function of the position of the separation signal 25 along the umMM I waveguide of interface B in each of these ports, each Michelson Waveguides or Michelson arms 2 7, 28, 29, 30, 3 1 are prepared for further propagation of each signal image or signal component. Each Mi Che Ison waveguide 17, 18, 19, 30, 31 ends at each reflection device 33, 35, 37, 39, 41, which collectively includes a reflection structure D. The reflection means 3 3, 3 5, 3 7, 7, 3, 41 can be composed of a total reflection structure, but preferably a reflection Bragg grating. Therefore, the signal component is reflected by the reflection device and propagates back to the Mi Che Ison waveguide toward each of 13, 15, 17, 19, and 21. "丨 (: The length of the 11613〇11 arm determines the phase relationship between the different signal components of each port of each wavelength channel. This phase relationship determines how the image provided by the MM I coupler in the opposite direction appears on interface A. According to In the present invention, the lengths of the Michel son arms 27, 28, 2 9, 3 0, 3 1 are individually designed to adapt to the signals obtained at each wavelength channel (wavelengths λι, 2, and λ *) of the interface B. The phase relationship is that the channels are combined in the Long Coupler 2 and focused to different ports. It is best that the design of the Mi Che Ison structure allows the channel with a wavelength of l · to be imaged on port 5 and the channel of eighth channel to be imaged on port 7. Channels of X, X are imaged on port 9 'and channels of λ4 are imaged on port 丨 丨. Each port 5, 7, 9, 丨 丨

484268 Amendment Difficulty 9¾ 1: Case Rat 丨 88121171 Month

Modifications Further arrangements can be made to transmit wavelength channels at 43, 45, 47, 49 in each output waveguide. The channel distance determines the necessary length difference between the MMI arms. Figure 2 briefly illustrates an example of the phase as a function of the position of the MMI waveguide (um) along the interface B along the signal component of the λ 1 (dashed line) and λ 2 (dotted line) wavelength channels, focusing on ports 5 and 7. Since the Μ ί facet combiner is symmetrical and selects the multiple 'interface B' 3 and 4 which are focused on ports 9 and 1 1, the phase relationship of the signal components of the wavelength channel will be related to the λ 丨 wavelength channel and the incoming signal 25 5 The same image of the phase relationship between the signal components. With today's manufacturing technology, it is difficult to obtain tolerances for the length of the MI arms. Therefore, the MM I demultiplexer 1 preferably includes phase control elements 5 1, 5 3, 55, 57 in at least four ^ 〇11613〇11 Arms 28, 29, 30, 31. The fifth Michelson arm 27 may contain this element (not shown in Figure i). The phase control element 5 1, 5 3, 5 5, 5 7 may consist of a simple trimming device or adjustment element for permanent fine adjustment, or it may include an active phase control element, especially a photoelectric control element. In the latter case, the wavelength is again! The selective (cyclic) switching of the wavelength channels of 2, 3, and λ 4 can also be implemented for each of the ports 5, 7, 9, and 11. In addition, the chirped Bragg grating illustrated in FIG. 3 can be used as an alternative to each of the reflection devices 33, 35, 37, 39, 41 in FIG. This Bragg grating provides reflections with a non-linear response. If the reflection part is a chirped Bragg grating, the filter characteristics can be improved. The grating period A is related to the B r a g g wavelength λ Bg (z) according to (Λ (ζ) = Λ z): ^ Bg (z) = 2ne (z, λ) Λ (ζ),

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V. Description of the invention (10) Distance: And yes, the refractive index ′ depends on the Λ Γ of the light in the direction of propagation, first the wavelength and 疋. The ideal Λ distribution can be expressed by the following formula: Λ (Z) = A ^ qz + c ^ zHc ^ zH ··,, tCl, C2, and ^ are constants. This formula is the Taylor series of any function. At 4 o'clock, the intensity K i of the grating can be changed to ki (ζ) = π Δη (ζ) / A ^ Cz), where Δη is the difference between the high and low levels in the grating structure. The design and manufacture of the time thumb structure (k-and λ Bg-distribution) must be

Separate execution is related to channel separation, ideal filter contour and bit rate (dynamic response). a If a reflective structure with a non-linear phase response is implemented, it is possible to significantly improve / resolver profile. Achieving a non-linear phase response in the M1 structure should be simpler than in the corresponding MZI structure. See the above-mentioned paper on the MZI case by c.K. Madsen. If a demultiplexed channel can be accepted on the same port, such as wavelength multiplexing, Guangwei is input, and the size of the MIMO structure may be reduced. In the embodiment described in Figure 1, it will be entirely possible to use a 4x4 MM I coupler instead of a 5x5 MMI_ coupler.

In addition, the MM I MIMO demultiplexer 1 is a reciprocating type, so it has the equivalent multiplexing function. In this regard, referring to FIG. 1 again, the four wavelength channels are i, 2, and λ 3 and λ 4 are at port 5. , 7, 9, 11 are separated and imaged at the channels of interface B, 13, 15, 17, 19, 21 through the input of the waveguide 43, 45, 47, 49 ° ΜΜΙ coupler 2. Here, the components of each channel have the same common phase relationship ', such as the phase relationship of the (reciprocating) reverse components in the f-multiplexing case. Since then ’

Page 15 484268 V. Description of the invention (11) The components are fed into the MI waveguide 2, and 28, 29, 30, 31 are transmitted to each reflection device 33, 35, 37, 39, 41, and the reflection at D The device reflects towards ports B, 19, 21 of interface B. In this interface, the components of all channels have a common phase relationship, which is the same as the reverse component of signal 2 5 in the case of demultiplexing. Therefore, all channels are focused on port 3 and include wavelengths λ !, λ2, λ3 and The multiplexing signal of the 4 wavelength channel is output in the waveguide 23. Next, the light addition / removal multiplexer (0ΑΜΜ) of the present invention will be further described with reference to FIG. 4 '. This OADM device includes a MIMO multiplexer 1 having waveguides 23, 43, 45, and 47, and includes a MIMO multiplexer 61. See FIG. 1 for the type. The arrangement of the waveguide 23 can guide the emitted multiplexed optical signals including four channels into 1, 2, 3, and 4 wavelengths, and for inputting the same signal to the MIMO demultiplexer. The arrangement of the multiplexer is for demultiplexing the optical signal, and outputting each wavelength channel in each of the waveguides 43, 45, 47, 49 (Long &quot; in 2, 3 and λ *), before The three waveguides are called transit waveguides and are connected to the MM IMM I multiplexer 6 1 on average. The last-mentioned waveguide provides the so-called removal function, that is, the wavelength channel λ 4 that propagates may be removed or switched off. In addition, the women's volleyball team has a waveguide 63 for inputting the same wavelength to the MM IMU I multiplexer 61 at the same wavelength as the closed channel. This wavelength connection therefore provides so-called increased multiplexing. Wavelength; ^, ^ 2, 3 and 4 demultiplexing channels are therefore input to the multiplexer 61, and after multiplexing, the signal is output at the waveguide 65 with wavelength multiplexing. Demultiplexer 1 and multiplexer 61 are provided in each MI structure and have an active phase control element, which can achieve a device with selective wavelength tuning. By controlling the phase control element, any channel λ! Can be guided to the waveguide "and /or

484268 V. Description of the invention (12) The same channel in the input / access waveguide 63. As described above, the present invention can provide an answer, especially for multiplexing / demultiplexing with a close wavelength distance, which can provide advantages in terms of performance (mainly in terms of filtering profile and crosstalk). Compared with the traditional MMIMZI structure, this tight structure provides the possibility of reducing losses and power consumption. In addition, when light has a short propagation path through the device, more stable performance can be achieved. If a reflective structure with a non-linear phase response is used, an extremely system-tolerant, unfiltered profile is obtained.

Of course, the M M I M demultiplexer 1 and the M M M I multiplexer 61 may be proportional to use any number of wavelength channels. We should note that the above-mentioned demultiplexer requires a MIMO coupler with a size of ΝΝΝ to process the i channel, where N ^ i +1. I understand that N = i is sufficient. This is true when multiplexing channels. In addition, the demultiplexer does not need to fully demultiplex a signal, but it can be used to demultiplex an optical signal containing eight channels into two separate signals, each of which contains four channels.

The present invention is not limited to the above-mentioned embodiments and drawings, and may be modified within the scope of the attached patent application. In particular, the invention is not limited to the selected material size and fabrication of the device.

Page 17 484268 η Μ

E 88121177 Acupoint year / month j Representation of the main elements of the revised schema 2 3,5,7,9,11 13, 15, 17, 19, 21 23 25 2 7, 2 8, 2 9, 3 0, 3 1 33, 35, 37, 39, 41 4 3, 4 5, 4 7, 4 9 51, 53, 55, 57 61 63 65 Multi-mode interference Michelson interferometer (MMIMI) demultiplexer MMI coupler port port waveguide Emitted wavelength multiplexed optical signal Michelson waveguide reflection device waveguide phase control element MMIMI multiplexer waveguide waveguide

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Claims (1)

484268 1 · A device for demultiplexing a wavelength-multiplexed optical signal (2 5), comprising at least one of the first and second optical wavelength channels focused on each predetermined wavelength (λ! ,, characterized by a The ΜΜΙΙ coupler (2) has a size of at least 2 × 2, and is used to input a wavelength-multiplexed optical signal at the input (3), and the signal used to separate this multiplexed signal into several components' and put it in several ports ( 1 3-2 1) imaging, Michelson waveguide (27-31), used to receive and transport the components of the imaging at each port of the MMI coupler, and a reflecting device (33-41), used to reflect The Mich el so'n waveguide receives and transmits each component back to the MIMO, and each component of the combiner. The arrangement of the MEMS coupler is used to input the reflection component, and the length of the Michelson waveguide can be adapted. The components are combined in the MMI coupler, and the first and second optical wavelength channels are imaged at different outputs (5-1 1) of the MMI coupler. 2. If the device of the scope of patent application No. 1 is used, the Michelson waveguide The lengths are different, the determination of the length difference between them and the wave between channels The distance (into 2-λ 1) is related.… 3 · If the device in the scope of patent application item 1 or 2 includes a phase adjustment device (5 1-5 7), it is used to receive and transmit to Michel 1 s ο η waveguide (2 7-3 1) at least some components for phase adjustment. 4 · If the device in the scope of patent application No. 3, the phase adjustment mechanism (5 1-5 7) is used for permanent fine adjustment It is composed of a trimming element for the phase of at least some of the components received and transmitted by the Michel 1 s η waveguide. 5. Phase adjustment in the device of the scope of patent application No. 3 O: \ 6i \ 6i624.ptc Page 1 2001 07 26. 020 484268 (5 1-5 7) is composed of a phase control element, especially η, &gt; used to control the phase of the components of the photothermal phase control element in the M i c h e 1 s η waveguide. Receiving and transmitting at least some of them. 6 · If the application of the scope of the first patent application, the control element (5 1-5 7), especially the photoelectric phase Qiu Song which contains' phase control Michel 1 s ο η wave The catheter receives and transmits at least &amp; manufacturing elements' for controlling the phase of certain components to be switched at the selective wavelength of the output wavelength channel to reach 7 Composed of Bragg gratings. Among them, the reflection mechanism (33-41) 8 · As the device in the seventh scope of the patent application, the so-called chirp (c h i r p). 'One of the Bragg gratings has 9 · If the device period of the patent application item No. 8 is Λ = Λ (z), the following formula is used:' where the Bra§g grating's grating Λ (ζ) = Ai + CiZ + CgzHc ^ zH · The distance in the broadcast direction. As many wavelengths as λ 1 and λ 2 CMC2 and eg are constants. z is the optical transmission 1 0.-a type for concentrating one on each predetermined device, which is characterized by an MMI coupler (2) with a size of at least 2x2, and is used to input the first in each round (5-11) And second optical wavelength channel, and separating the channel into several components, and imaging them at several ports (1 3-2 1), Michelson waveguides (27-31) for receiving and transporting Each component imaged on the MMI coupler, a reflecting device (33-41) is used to reflect the components received and transmitted in the Michelson waveguide back to the ports of the MMI coupler, where O: \ 61 \ 61624.ptc Page 2 2001. 07. 26. 〇21 Η-ΟΗZΟδ Case 1 8812] 丄 77 Modified Μ Μ I _ the safety of the combiner by M1ChelsQn &amp; li = reflection components, and ... combine the components' to adjust the length of each official person, the off 1 consumption, the optical signal of the device in a single output (make 3; into the first-wavelength multiplexing of the second optical wavelength channel 11 'types of devices for optical addition / removal of multiplexing', which is characterized by a multi-wavelength-multiplexed optical signal (25)工装 # 噌 l = at least focused on the first and second wavelength channels of each predetermined wavelength (H), characterized by an MMI splicer (2), with a size of at least 2x2, for input (3) The input wavelength multiplexed optical signal, and the signal used to separate this multiplexed signal into several components, and imaged it in several ports (丨 3-2 丨), Michelson waveguide (27-31), Receiving means (33-41) are used to receive and transmit the components of the imaging at each frame of the MMI coupler, and to reflect and receive the components at the Michelson waveguide to the ports of the MEMS coupler, The arrangement of the MM I coupler is used to input the reflection component, and each length of the Michelson waveguide can be adapted In this MMI coupler, the components are combined, the first and second optical wavelength channels are imaged at different outputs (5-11) of the 1 coupler, and the multiplexing device according to item 10 of the patent application scope (6 1). 1 2 · The device according to item 1 of the patent application scope, which comprises an input waveguide (23) for inputting an optical multiplexing signal to the demultiplexer (1) 'at least one crossing The crossover waveguide (43, 45, 47) is used to output a demultiplexing channel from the demultiplexer (1), and transfer and input the same channel at the multiplexer (61). Page 3, 2001.07.26.022 O: \ 61 \ 61624.ptc 484268 88121177 In the 7th year of the month and month, the correction 6k ^^ | (49) is used to output another demultiplexing channel from the demultiplexer for removal, use (Removal function), at least one waveguide (63) is used to input another V device (f V (increase function) ') and an output waveguide (65) is used to output one = evening signal, the optical multiplexing signal Contains the demultiplexed channel transmitted in the transit waveguide, and another signal is input to the multiplexer. 13. If the device in the scope of patent application η * 12 / the demultiplexer ΤΛ has more active phase control elements, It enables the device to show the tunability of wavelength selection. Go to 14. Two methods of multiplexing a two-wavelength multiplexed optical signal (25) by a person. The etiquette method includes focusing on each predetermined .. ^, first And the second optical wavelength channel, which is characterized by the following steps: 2 ^ and the user input signal L3 at the input (3) of the 01 coupler (2) (2) (2) to separate the signal into a number #, And imaging them in several ports (1 3-2 1), receiving and transporting the MMI in the Michelson waveguide (27-31) The components of each port imaging reflect the components received and transmitted in the Michelson waveguide back to the ports of the MMI coupler at an appropriate distance from the MMI coupler, and input and combine the reflected components in the MMI facet combiner. The first and second optical wavelength channels are actually imaged at different inputs A (5-Π). O: \ 61 \ 61624.ptc Page 4 2001.07. 26.023