TW202032931A - Wavelength selective enable bidirectional access system - Google Patents
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本發明是有關一種分波多工雙向傳輸接取系統,特別是一種能夠透過空間光調變器作為可程式化繞射元件,來達到無線光通訊雙向傳輸接取目的之系統。The invention relates to a division-wave multiplexing two-way transmission and access system, in particular to a system that can use a spatial light modulator as a programmable diffraction element to achieve the purpose of two-way transmission and access for wireless optical communication.
無線光通訊技術發展之起源是為了支援部分對於安裝光纖、享受光纖寬頻網路有困難之地區所提出之技術與構想,即無需經由如光纖、電纜等有線介質來作為通訊之媒介,故又稱為自由空間光通訊系統(Free Space Optical Communication, FSOC)。The origin of the development of wireless optical communication technology is to support the technologies and ideas proposed by some areas that have difficulties in installing optical fibers and enjoying optical fiber broadband networks, that is, without using wired media such as optical fibers and cables as communication media, so it is also called It is the Free Space Optical Communication (FSOC).
而不同波段之光源在傳輸通道中傳送時之傳播特性也不盡相同,故需基於不同應用及場合選用合適之光源,藉由所選用光源本身之波長特性,簡單分為可見無線光通訊系統、不可見無線光通訊系統兩大類;The propagation characteristics of light sources of different wavelength bands when transmitted in the transmission channel are not the same. Therefore, suitable light sources must be selected based on different applications and occasions. By the wavelength characteristics of the selected light sources, they can be simply divided into visible wireless optical communication systems, Two categories of invisible wireless optical communication systems;
而無線光通訊技術主要為光訊號透過光被動網路(Passive Optical Network, PON)進行傳輸後,在用戶接收端用來克服光纖鋪設不易之問題,但有鑑於目前所提出之各種無線光通訊系統架構皆為點對點(Point to Point, P2P)通訊,並且在接收端只能固定服務一個輸出埠,因此系統彈性並不高。The wireless optical communication technology is mainly used to overcome the difficulty of laying optical fibers at the user receiving end after optical signals are transmitted through a passive optical network (PON). However, in view of the various wireless optical communication systems currently proposed The architecture is all Point to Point (P2P) communication, and only one output port can be fixed at the receiving end, so the system flexibility is not high.
因此,為了改善傳統之無線光通訊系統架構只能進行點對點(P2P)通訊之缺點,若能夠使用可程式化繞射元件之空間光調製器(Spatial Light Modulator, SLM)作為動態繞射元件,並透過 可程式化繞射元件之空間光調製器之控制針對入射光束進行重新配置輸出波束寬度及位置,如此將能夠達到雙向無線光通訊系統接取之目的,並透過上述系統來改善傳統之系統架構彈性不足之缺點,因此本發明應為一最佳解決方案。Therefore, in order to improve the traditional wireless optical communication system architecture that can only perform P2P communication, if the spatial light modulator (SLM) with programmable diffraction element can be used as the dynamic diffraction element, and Through the control of the spatial light modulator of the programmable diffractive element, the output beam width and position are reconfigured for the incident beam, so that the two-way wireless optical communication system can be accessed, and the traditional system architecture can be improved through the above system The shortcomings of insufficient flexibility, therefore, the present invention should be an optimal solution.
本發明分波多工雙向傳輸接取系統,係包含:兩個以上的光終端機,其中每一個光終端機係至少包含一光偵測接收器;至少一無線光通訊節點端,係至少包含兩個以上的光發射模組,係能夠分別發射兩個以上的具有不同波長之波束;一波長分離元件,該波長分離元件係能夠將不同波長之波束分離朝向不同方向的光終端機進行傳輸;以及一空間光調變器,係設置於該無線光通訊節點端之光發射模組所發射具有不同波長之波束的行進路徑上,該空間光調變器元件用以透過相位調變控制不同波長之波束位移後以不同角度入射至該波長分離元件,由於不同波長之波束入射至波長分離元件之入射角不同,故經由該波長分離元件出射至該光終端機後的角度能夠改變以朝向不同方向的光終端機。The demultiplexing two-way transmission and access system of the present invention includes: two or more optical terminals, wherein each optical terminal includes at least one optical detection receiver; at least one wireless optical communication node terminal includes at least two More than one light emitting module, which can respectively emit two or more beams with different wavelengths; a wavelength separation element, which can separate the beams of different wavelengths and transmit to optical terminals in different directions; and A spatial light modulator is arranged on the travel path of beams with different wavelengths emitted by the light emitting module at the wireless optical communication node end, and the spatial light modulator element is used to control different wavelengths through phase modulation After the beam is shifted, it is incident on the wavelength separation element at different angles. Since the beams of different wavelengths enter the wavelength separation element at different incident angles, the angle after exiting the optical terminal through the wavelength separation element can be changed to face different directions. Optical terminal.
更具體的說,所述光終端機更包含有一波束聚焦器,以使波長分離元件出射之波束能夠先通過該波束聚焦器再接觸到該光偵測接收器。More specifically, the optical terminal further includes a beam concentrator, so that the beam emitted by the wavelength separation element can first pass through the beam concentrator and then contact the optical detection receiver.
更具體的說,所述光發射模組係為一漸變折射率透鏡光纖。More specifically, the light emitting module is a graded index lens fiber.
更具體的說,所述光發射模組與該空間光調變器之間設置有一波束擴展器,係用以將該光發射模組所發射之波束進行擴大調整。More specifically, a beam expander is provided between the light emitting module and the spatial light modulator to expand and adjust the beam emitted by the light emitting module.
更具體的說,所述光發射模組與該空間光調變器之間設置有一波束準直器,係用以將該光發射模組所發射之波束進行準直調整。More specifically, a beam collimator is arranged between the light emitting module and the spatial light modulator to adjust the collimation of the beam emitted by the light emitting module.
更具體的說,所述空間光調變器係為一可程式化繞射元件,而該可程式化繞射元件係能夠為矽基液晶元件、液晶元件或是微機電系統。More specifically, the spatial light modulator is a programmable diffractive element, and the programmable diffractive element can be a silicon-based liquid crystal element, a liquid crystal element, or a microelectromechanical system.
更具體的說,所述波長分離元件係為一反射式閃耀光柵或是一反射式全像光柵。More specifically, the wavelength separation element is a reflective blazed grating or a reflective holographic grating.
更具體的說,所述波長分離元件係為反射式全像光柵,該空間光調變器與該波長分離元件之間更能夠設置一半波片(Half-wave plate),其中該半波片用以控制波束從該空間光調變器出射後再入射至波長分離元件之極化方向。More specifically, the wavelength separation element is a reflective holographic grating, and a half-wave plate can be arranged between the spatial light modulator and the wavelength separation element, wherein the half-wave plate is used for The control beam is emitted from the spatial light modulator and then enters the polarization direction of the wavelength separation element.
一種分波多工雙向傳輸接取系統,係包含:兩個以上的光終端機,其中每一個光終端機係至少包含一光發射模組,該光發射模組係能夠發射一具有不同波長之波束;至少一無線光通訊節點端,係至少包含兩個以上的光接收模組,係用以接收兩個以上的具有不同波長之波束;一空間光調變器,係能夠模擬出多階相位調變之閃耀光柵,而使入射至該空間光調變器的波束能夠以不同角度分離朝向不同方向的光接收模組進行傳輸;以及一波長分離元件,該設置於該光終端機之光發射模組所發射具有不同波長之波束的行進路徑上,而該波長分離元件係能夠將不同波長之波束分離並朝向該空間光調變器進行傳輸。A demultiplexing bidirectional transmission and access system, which includes: two or more optical terminals, each of which includes at least one light emitting module, which can emit a beam of different wavelengths ; At least one wireless optical communication node end contains at least two or more optical receiving modules, which are used to receive more than two beams with different wavelengths; a spatial optical modulator, which can simulate multi-level phase modulation It can be changed to a blazed grating, so that the beam incident on the spatial light modulator can be transmitted at different angles to separate the light receiving modules facing different directions; and a wavelength separating element, which is arranged in the light emitting module of the optical terminal The beams of different wavelengths emitted by the group are on the traveling path, and the wavelength separation element can separate the beams of different wavelengths and transmit them toward the spatial light modulator.
更具體的說,所述光終端機之光發射模組內更包含有一漸變折射率透鏡光纖。More specifically, the light emitting module of the optical terminal further includes a graded index lens fiber.
更具體的說,所述光終端機更具有一波束擴展器,係用以將該光終端機之光發射模組所發射之波束進行擴大調整。More specifically, the optical terminal further has a beam expander, which is used to expand and adjust the beam emitted by the light emitting module of the optical terminal.
更具體的說,所述光終端機更具有一波束準直器,係用以將該光終端機之光發射模組所發射之波束進行準直調整。More specifically, the optical terminal machine further has a beam collimator, which is used for collimating and adjusting the beam emitted by the light emitting module of the optical terminal machine.
更具體的說,所述空間光調變器係為一可程式化繞射元件,而該可程式化繞射元件係能夠為矽基液晶元件、液晶元件或是微機電系統。More specifically, the spatial light modulator is a programmable diffractive element, and the programmable diffractive element can be a silicon-based liquid crystal element, a liquid crystal element, or a microelectromechanical system.
更具體的說,所述波長分離元件係為一反射式閃耀光柵或是一反射式全像光柵。More specifically, the wavelength separation element is a reflective blazed grating or a reflective holographic grating.
更具體的說,所述波長分離元件係為反射式全像光柵,該空間光調變器與該波長分離元件之間更能夠設置一半波片(Half-wave plate),其中該半波片用以控制波束從該空間光調變器出射後再入射至波長分離元件之極化方向。More specifically, the wavelength separation element is a reflective holographic grating, and a half-wave plate can be arranged between the spatial light modulator and the wavelength separation element, wherein the half-wave plate is used for The control beam is emitted from the spatial light modulator and then enters the polarization direction of the wavelength separation element.
更具體的說,所述無線光通訊節點端之光接收模組更包含有一漸變折射率透鏡光纖。More specifically, the light receiving module at the node end of the wireless optical communication further includes a graded index lens fiber.
更具體的說,所述無線光通訊節點端之光接收模組係為一多模光纖陣列。More specifically, the optical receiving module of the wireless optical communication node end is a multi-mode optical fiber array.
更具體的說,所述無線光通訊節點端之光接收模組與該空間光調變器之間更包含有一波束聚焦器,以使由該空間光調變器出射之波束能夠先通過該波束聚焦器再接觸到該光發射模組。More specifically, a beam concentrator is further included between the light receiving module of the wireless optical communication node and the spatial light modulator, so that the beam emitted by the spatial light modulator can pass through the beam first The focuser then contacts the light emitting module.
更具體的說,所述單一個無線光通訊節點端之光接收模組係能夠接收一個、兩個或是兩個以上的波束。More specifically, the optical receiving module of the single wireless optical communication node can receive one, two, or more than two beams.
有關於本發明其他技術內容、特點與功效,在以下配合參考圖式之較佳實施例的詳細說明中,將可清楚的呈現。The other technical content, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiment with reference to the drawings.
本發明之下載鏈路方向之實施說明如下: 請參閱第1A~1C圖,為本發明分波多工雙向傳輸接取系統之下載鏈路之第一實施之整體架構示意圖、第一實施之無線光通訊節點端之架構示意圖及第一實施之光終端機之架構示意圖,由圖中可知,該分波多工雙向傳輸接取系統係包含兩個以上的光終端機2及至少一無線光通訊節點端1,其中每一個光終端機2係包含一光偵測接收器21及一波束聚焦器22,其中該波束聚焦器22用以使該波長分離元件15出射之波束能夠先通過該波束聚焦器22再接觸到該光偵測接收器21。The implementation description of the download link direction of the present invention is as follows: Please refer to Figures 1A~1C, which are the overall architecture diagram of the first implementation of the download link of the demultiplexing two-way transmission and access system of the present invention, and the wireless optical The schematic diagram of the structure of the communication node terminal and the schematic diagram of the structure of the optical terminal of the first implementation. It can be seen from the figure that the demultiplexing two-way transmission and access system includes more than two
其中該無線光通訊節點端1係包含兩個以上的光發射模組11、一波束擴展器12(Beam Expander)、一波束準直器13(Collimated Lens Set)、一空間光調變器14(SLM)及一波長分離元件15,其中該光發射模組11內更包含有一漸變折射率透鏡光纖(GRIN Lens Fiber),因此當該光發射模組11內所發射的雷射光功率耦合至該漸變折射率透鏡光纖後,能夠通過該漸變折射率透鏡光纖來作為雷射光訊號之發射;The wireless optical
而該波束擴展器12及該波束準直器13能夠將該光發射模組11所發射不同波長之波束進行控制波束之大小及平行之程度,之後,當波束入射到該空間光調變器元件14後,其中該空間光調變器係為一可程式化繞射元件(SLM),由於可程式化繞射元件為多像素組成之週期性結構,所以在利用可程式化繞射元件做為繞射元件時,各波長繞射光之繞射角度會受到可程式化繞射元件之基本週期結構所限制,故每個波長之於可程式化繞射元件皆會有獨立之最大繞射角度,但為確保每個波長可以切換到相同之輸出位置,故必須使用最小偏轉角度作為每個波長所能使用之最大偏轉角度限制;The beam expander 12 and the
而該可程式化繞射元件係能夠為矽基液晶元件 (Liquid Crystal on Silicon, LCoS)、液晶元件 (Liquid Crystal, LC)或是微機電系統 (Microelectromechanical Systems, MEMS)。The programmable diffraction element can be a liquid crystal on silicon (LCoS), a liquid crystal (LC), or a microelectromechanical system (MEMS).
因此該空間光調變器元件14能夠透過相位調變控制不同波長之波束位移後以不同角度入射至該波長分離元件15,由於不同波長之波束入射至波長分離元件之入射角不同,故經由該波長分離元件15出射至該光終端機2後的角度能夠改變,以使不同波長之波束能夠分別朝向不同方向的光終端機傳輸。Therefore, the spatial
另外該波長分離元件15係為一反射式閃耀光柵(Phase Only Reflective Blazed Grating)或是一反射式全像光柵(Reflective Holographic Grating),如第2A圖所示,該波長分離元件15就是一反射式閃耀光柵,因此波束先經過該空間光調變器14並藉由其相位調變之特性,能夠將波束位移後以各種不同角度入射至該反射式閃耀光柵,由於波束入射至反射型閃耀光柵之入射角不同,故經由反射型閃耀光柵出射後角度也會隨之改變而達到波束位移(Beam Steering)之效;In addition, the
其中 下載鏈路之第一實施說明如下 : 主要由兩個繞射元件所構成,故繞射元件之參數將會限制住本實施例所可使用之波長範圍,其架構所使用之波長以及其波束可位移之角度計算如下所示(反射型光柵方程式): 𝐷(sin𝜃𝑖 +sin𝜃𝑚 )=mλ (公式1) 其中,D 為光柵週期、𝜃𝑖 為光束入射角、𝜃𝑚 為 m 階繞射光與光柵法線夾角、m 為繞射階數、λ為波長; Wherein the first described embodiment download link as follows: mainly constituted by two diffractive elements, the parameter elements will be locked so that the diffraction wavelength range of the present embodiment may be used as the embodiment, the use of its structure and its beam wavelength The displacement angle is calculated as follows (reflective grating equation): 𝐷(sin𝜃 𝑖 +sin𝜃 𝑚 )=mλ (Formula 1) where D is the grating period, 𝜃 𝑖 is the beam incident angle, and 𝜃 𝑚 is the m-order diffracted light The angle with the grating normal, m is the diffraction order, and λ is the wavelength;
而基於反射型光柵方程式與可程式化繞射元件 和 Grating 之幾何關係圖如第2B圖所示,並討論其一階繞射光,可以得出波束出射後與可程式化繞射元件之法線夾角為: 𝜃𝑚𝐿 =sin−1 (𝜆/𝐷𝐿 −sin(𝑥)) (公式2) 其中,𝐷𝐿 為可程式化繞射元件上光柵圖型之週期、𝑥為波束入射可程式化繞射元件時之入射角(在此亦為可程式化繞射元件擺放與垂直面之夾角)、𝜆為波長;Based on the reflection-type grating equation and the geometric relationship diagram of the programmable diffraction element and Grating as shown in Figure 2B, and discussing its first-order diffracted light, the normal line between the beam and the programmable diffraction element can be obtained. The included angle is: 𝜃 𝑚𝐿 =sin −1 (𝜆/𝐷 𝐿 −sin(𝑥)) (Equation 2) where 𝐷 𝐿 is the period of the grating pattern on the programmable diffraction element, and 𝑥 is the beam incident programmable winding The incident angle (here is also the angle between the placement of the programmable diffractive element and the vertical plane), 𝜆 is the wavelength;
再由第2B圖可知,Grating之入射角為: 𝜃𝑖𝐺 =𝑥+𝑦−sin−1 (𝜆/𝐷𝐿 −sin(𝑥2)) (公式3) 其中,𝜃𝑖𝐺 為波束入射光柵後與光柵法線之夾角、𝑥為可程式化繞射元件擺放與垂直面之夾角、𝑦為光柵擺放與垂直面之夾角、𝐷𝐿 為可程式化繞射元件上光柵圖型之週期、𝜆為波長。而由於此𝜃𝑚𝐿 與波束入射可程式化繞射元件之入射角分別位於可程式化繞射元件之法線兩側,故藉由觀察第2B圖求光柵之入射角時,𝜃𝑚𝐿 前必須加一負號。From Figure 2B, we can see that the incident angle of Grating is: 𝜃 𝑖𝐺 =𝑥+𝑦−sin −1 (𝜆/𝐷 𝐿 −sin(𝑥2)) (Equation 3) where 𝜃 𝑖𝐺 is the beam incident on the grating and the grating method The angle of the line, 𝑥 is the angle between the placement of the programmable diffraction element and the vertical plane, 𝑦 is the angle between the placement of the grating and the vertical plane, 𝐷 𝐿 is the period of the grating pattern on the programmable diffraction element, and 𝜆 is the wavelength . And since the incident angles of this 𝜃 𝑚𝐿 and the beam incident programmable diffracting element are on both sides of the normal of the programmable diffracting element, the incident angle of the grating must be added before 𝜃 𝑚𝐿. One negative sign.
而波束由光柵出射後與光柵法線之夾角為: 𝜃𝑚𝐺 =sin−1 (𝜆/𝐷𝐺−sin(𝑥+𝑦−sin−1 (𝜆/𝐷𝐿−sin(𝑥)))) (公式4) 其中,𝜃𝑚𝐺 為波束由光柵出射後與光柵法線之夾角、𝐷𝐺 為光柵週期、𝑥為可程式化繞射元件擺放與垂直面之夾角、𝑦為 Grating 元件擺放與垂直面之夾角、𝐷𝐿 為可程式化繞射元件上光柵圖型之週期、𝜆為波長。The angle between the beam and the normal of the grating after exiting the grating is: 𝜃 𝑚𝐺 =sin −1 (𝜆/𝐷𝐺−sin(𝑥+𝑦−sin −1 (𝜆/𝐷𝐿−sin(𝑥)))) (Equation 4) Among them, 𝜃 𝑚𝐺 is the angle between the beam emitted from the grating and the grating normal, 𝐷 𝐺 is the grating period, 𝑥 is the angle between the placement of the programmable diffraction element and the vertical plane, and 𝑦 is the angle between the placement of the grating element and the vertical plane , 𝐷 𝐿 is the period of the grating pattern on the programmable diffraction element, and 𝜆 is the wavelength.
而不同波長之波束在下載鏈路方向可位移之角度範圍受可程式化繞射元件之解析度所限制,即𝐷𝐿
有最小2 × 6.4(μm)以及最大1920 × 6.4(μm)之限制,將此兩限制代入公式4中,可得此架構各波長之波束可位移之角度為出射波束與光柵法線(10 deg.)之夾角其限制如下: (1) 1530nm → 𝜃𝑚𝐺
= 8.94°~13.98° → 位移角度∆𝜃𝑚𝐺
= 5.04° (2) 1550nm → 𝜃𝑚𝐺
= 9.63°~14.76° → 位移角度∆𝜃𝑚𝐺
= 5.13° (3) 1570nm → 𝜃𝑚𝐺
= 10.33°~15.54° → 位移角度∆𝜃𝑚𝐺
= 5.21° (4) 1590nm → 𝜃𝑚𝐺
= 11.03°~16.33° → 位移角度∆𝜃𝑚𝐺
= 5.3°The angular range of beams of different wavelengths that can be displaced in the download link direction is limited by the resolution of the programmable diffraction element, that is, 𝐷 𝐿 has a minimum of 2 × 6.4 (μm) and a maximum of 1920 × 6.4 (μm). Substituting these two restrictions into
由於該波長分離元件15亦能夠為一反射式全像光柵(Reflective Holographic Grating),由於反射式全像光柵與可程式化繞射元件之空間光調變器對於輸入光波極化方向之要求前者為水平線極化後者為 45 度線極化,如第3及4A圖所示,必須在此兩個繞射元件中加入一半波片16以控制波束從第一個繞射元件出射後再入射至第二個繞射元件時之極化方向,並且經由將輸入光之極化方向和經過半波片之後欲輸出之光之極化方向代入瓊斯矩陣(Jones Matrix)運算後可得知欲使輸入半波片與從半波片輸出之光極化方向可偏轉 45 度,則半波片必須設置為與水平軸夾角 22.5 度。Since the
其中 下載鏈路之第二實施說明如下 : 因下載鏈路之第二實施主要由兩個繞射元件所構成,故繞射元件之參數將會限制住本實施例所可使用之波長範圍,其架構所使用之波長以及其波束可位移之角度計算如下所示(反射型光柵方程式): 𝐷(sin𝜃𝑖 +sin𝜃𝑚 )=mλ (公式5) 其中,D 為光柵週期、𝜃𝑖 為光束入射角、𝜃𝑚 為 m 階繞射光與光柵法線夾角、m 為繞射階數、λ為波長; The description of the second implementation of the download link is as follows : Since the second implementation of the download link is mainly composed of two diffractive elements, the parameters of the diffractive elements will limit the wavelength range that can be used in this embodiment. The wavelength used by the architecture and the angle of beam displacement are calculated as follows (reflective grating equation): 𝐷(sin𝜃 𝑖 +sin𝜃 𝑚 )=mλ (Equation 5) where D is the grating period and 𝜃 𝑖 is the beam incident angle , 𝜃 𝑚 is the angle between the m-order diffracted light and the grating normal, m is the diffraction order, and λ is the wavelength;
而基於反射型光柵方程式與可程式化繞射元件和 Grating 之幾何關係圖如第4B圖所示,並討論其一階繞射光,可以得出波束經由可程式化繞射元件出射後與 LCoS 之法線夾角為: 𝜃𝑚𝐿 =sin−1 (𝜆/𝐷𝐿 −sin(𝑥2)) (公式6) 其中,𝐷𝐿 為可程式化繞射元件上光柵圖型之週期、𝑥2為波束入射可程式化繞射元件時之入射角(在此亦為可程式化繞射元件擺放與垂直面之夾角)、𝜆為波長;Based on the reflection-type grating equation and the geometric relationship between the programmable diffractive element and the grating as shown in Figure 4B, and discussing its first-order diffracted light, it can be concluded that the beam passes through the programmable diffractive element and the LCoS The normal angle is: 𝜃 𝑚𝐿 =sin −1 (𝜆/𝐷 𝐿 −sin(𝑥2)) (Equation 6) where 𝐷 𝐿 is the period of the grating pattern on the programmable diffraction element, and 𝑥2 is the beam incidence programmable The incident angle when the diffraction element is changed (here is also the angle between the placement of the programmable diffraction element and the vertical plane), 𝜆 is the wavelength;
再由第4B圖可知,Grating之入射角為: 𝜃𝑖𝐺 =𝑥2+𝑦2−sin−1 (𝜆/𝐷𝐿 −sin(𝑥2)) (公式7) 其中,𝜃𝑖𝐺 為波束入射光柵後與光柵法線之夾角、𝑥2為可程式化繞射元件擺放與垂直面之夾角、𝑦2為光柵擺放與垂直面之夾角、𝐷𝐿 為可程式化繞射元件上光柵圖型之週期、𝜆為波長。而由於此𝜃𝑚𝐿 與波束入射可程式化繞射元件之入射角分別位於可程式化繞射元件之法線兩側,故藉由觀察第4B圖求光柵之入射角時,𝜃𝑚𝐿 前必須加一負號。From Figure 4B, we can see that the incident angle of Grating is: 𝜃 𝑖𝐺 = 𝑥2+𝑦2−sin −1 (𝜆/𝐷 𝐿 −sin(𝑥2)) (Equation 7) where 𝜃 𝑖𝐺 is the beam incident on the grating and the grating method The angle of the line, 𝑥2 is the angle between the placement of the programmable diffraction element and the vertical plane, 𝑦2 is the angle between the placement of the grating and the vertical plane, 𝐷 𝐿 is the period of the grating pattern on the programmable diffraction element, and 𝜆 is the wavelength . And because the incident angles of this 𝜃 𝑚𝐿 and the beam incident programmable diffracting element are on both sides of the normal of the programmable diffracting element, the incident angle of the grating must be added before 𝜃 𝑚𝐿 by observing Figure 4B. One negative sign.
而波束由光柵出射後與光柵法線之夾角為: 𝜃𝑚𝐺 =sin−1 (𝜆/𝐷𝐺−sin(𝑥2+𝑦2−sin−1 (𝜆/𝐷𝐿−sin(𝑥2)))) (公式8) 其中,𝜃𝑚𝐺 為波束由光柵出射後與光柵法線之夾角、𝐷𝐺 為光柵週期、𝑥2為可程式化繞射元件擺放與垂直面之夾角、𝑦2為 Grating 元件擺放與垂直面之夾角、𝐷𝐿 為可程式化繞射元件上光柵圖型之週期、𝜆為波長。The angle between the beam and the normal of the grating after exiting the grating is: 𝜃 𝑚𝐺 =sin −1 (𝜆/𝐷𝐺−sin(𝑥2+𝑦2−sin −1 (𝜆/𝐷𝐿−sin(𝑥2)))) (Equation 8) Among them, 𝜃 𝑚𝐺 is the angle between the beam emitted from the grating and the grating normal, 𝐷 𝐺 is the grating period, 𝑥2 is the angle between the placement of the programmable diffraction element and the vertical plane, and 𝑦2 is the angle between the placement of the grating element and the vertical plane , 𝐷 𝐿 is the period of the grating pattern on the programmable diffraction element, and 𝜆 is the wavelength.
而不同波長之波束在下載鏈路方向可位移之角度範圍受可程式化繞射元件之解析度所限制,即𝐷𝐿 有最小2 × 6.4(μm)以及最大1920 × 6.4(μm)之限制,將此兩限制代入公式8中,可得此架構各波長之波束可位移之角度為出射波束與光柵法線(52 deg.)之夾角其限制如下: (1) 1530nm → 𝜃𝑚𝐺 = 51.66°~56.98° → 位移角度∆𝜃𝑚𝐺 = 5.32° (2) 1550nm → 𝜃𝑚𝐺 = 51.74°~57.07° → 位移角度∆𝜃𝑚𝐺 = 5.33° (3) 1570nm → 𝜃𝑚𝐺 = 51.82°~57.17° → 位移角度∆𝜃𝑚𝐺 = 5.35° (4) 1590nm → 𝜃𝑚𝐺 = 51.91°~57.27° → 位移角度∆𝜃𝑚𝐺 = 5.36°The angular range of beams of different wavelengths that can be displaced in the download link direction is limited by the resolution of the programmable diffraction element, that is, 𝐷 𝐿 has a minimum of 2 × 6.4 (μm) and a maximum of 1920 × 6.4 (μm). Substituting these two restrictions into Equation 8, the angle at which the beam of each wavelength of this architecture can be displaced is the angle between the exit beam and the grating normal (52 deg.). The restrictions are as follows: (1) 1530nm → 𝜃 𝑚𝐺 = 51.66°~ 56.98° → Displacement angle ∆𝜃 𝑚𝐺 = 5.32° (2) 1550nm → 𝜃 𝑚𝐺 = 51.74°~57.07° → Displacement angle ∆𝜃 𝑚𝐺 = 5.33° (3) 1570nm → 𝜃. 𝜃 𝑚𝐺 = 5.35° (4) 1590nm → 𝜃 𝑚𝐺 = 51.91°~57.27° → displacement angle ∆𝜃 𝑚𝐺 = 5.36°
本發明之上載鏈路方向之實施說明如下
: 如第5A~5C圖所示,該分波多工雙向傳輸接取系統係包含兩個以上的光終端機2及至少一無線光通訊節點端1,其中每一個光終端機2係包含一光發射模組23(光發射模組23內更包含有一漸變折射率透鏡光纖)、一波束擴展器24及一波束準直器25,而該光發射模組23係能夠發射一具有不同波長之波束,且該波束擴展器24及該波束準直器25能夠將該光發射模組23所發射不同波長之波束進行控制波束之大小及平行之程度; The implementation of the upload link direction of the present invention is described as follows : As shown in Figures 5A to 5C, the demultiplexing two-way transmission and access system includes more than two
而該無線光通訊節點端1係包含兩個以上的光接收模組17、一空間光調變器14、一波長分離元件15及一波束聚焦器18,其中該波長分離元件15係能夠將光發射模組23所出射不同波長之波束分離並朝向該空間光調變器14進行傳輸;The wireless optical
而該空間光調變器14係能夠進一步模擬出多階相位調變之閃耀光柵,以使入射至該空間光調變器的波束能夠以不同角度分離朝向不同方向的光接收模組17進行傳輸,由於該空間光調變器係為一可程式化繞射元件,而該可程式化繞射元件為一矩陣型像素所組成之元件,其模擬出相位型閃耀光柵使用為習用技術,相關領域之技術人員必然知曉如何模擬,故於此不額外說明。The spatial
另外該波長分離元件15係為一反射式閃耀光柵(Phase Only Reflective Blazed Grating)或是一反射式全像光柵(Reflective Holographic Grating),如第6A及6B圖所示,該波長分離元件15就是一反射式閃耀光柵,而對應之光接收模組17內則具有漸變折射率透鏡光纖,另外第6A圖及第6B圖差異為是在接收端採取一維接收架構或是二維接收架構,其中第6A圖則是使用一維接收架構(單一個光接收模組17係能夠接收一個波束),而第6B圖則是使用二維接收架構(單一個光接收模組17係能夠接收一個以上的波束);In addition, the
因此,該上載鏈路之第一實施在波束上行傳輸時,先經由反射式相位型閃耀光柵分波後,再分別入射至可程式化繞射元件之空間光調變器(空間光調變器14)上,並且藉由控制可程式化繞射元件之空間光調變器以模擬出多階相位調變之閃耀光柵,藉此閃耀光柵圖形之設計及計算使得不同波長之波束在經過此節點後可以在接收端達到波長選擇及交換之效。Therefore, in the first implementation of the upload link, when the beam is transmitted upstream, it is first split by a reflective phase-type blazed grating, and then separately incident on the spatial light modulator (spatial light modulator) of the programmable diffraction element 14) Above, and by controlling the spatial light modulator of the programmable diffractive element to simulate the multi-stage phase modulation blazed grating, the design and calculation of the blazed grating pattern makes the beams of different wavelengths pass through this node Then the effect of wavelength selection and switching can be achieved at the receiving end.
其中上載鏈路 之第一實施說明如下 : 在系統上載鏈路之第一實施,由於光柵之週期以及可程式化繞射元件之尺寸會限制了系統所使用之光源波長與波長間之波道間距(Channel Spacing),故以下則針對在不改變架構之情形下,計算其使用不同週期之光柵與波道間距之關係,而第一實施之上載鏈路架構示意圖如第6C圖所示,其中,𝑦1為可程式化繞射元件(本實施例為LCoS)擺放與垂直面之夾角、𝑥1為Grating 元件(光柵)擺放與垂直面之夾角、𝜃𝑚𝐺 為波束由光柵出射後與光柵法線之夾角、𝜃𝑚𝐿 為波束與可程式化繞射元件之法線夾角; 由於此架構與前述相同,故省略其他部份,本實施例則直接計算使用不同週期之光柵與波道間距之關係,而根據反射型光柵方程式(公式5)之使用可得以下公式: 𝐷𝐺 (sin𝜃𝑖 +sin𝜃1 )=λ1 (公式9) 𝐷𝐺 (sin𝜃𝑖 +sin𝜃2 )=λ1 +Δλ (公式10) 其中,𝐷𝐺 為光柵週期、𝜃𝑖 光柵之入射角、𝜃1 與𝜃2 分別為λ1 與λ1 +Δλ之一階繞射角、λ1 為波長、Δλ為波道間距,之後再將公式10減去公式9可得以下公式: 𝐷𝐺 (sin𝜃2 −sin𝜃1 )=Δλ (公式11) 而在此架構中假設分布在可程式化繞射元件上最大之光斑(RMS Spot Radius)為 371.648μm, (λ1 + ∆λ=1530nm)故在計算光柵週期與波道間距時,必須考慮在∆λ之波道間距與𝐷𝐺 之光柵週期條件下,波道間距相鄰之兩波長必須在可程式化繞射元件上至少能分離一個光斑之間距,故𝜃2 − 𝜃1 必須滿足 「𝜃2 − 𝜃1 ≥ 0.45°」的條件。 The first implementation of the upload link is explained as follows : In the first implementation of the system upload link, the period of the grating and the size of the programmable diffraction element will limit the wavelength of the light source used by the system and the channel spacing between the wavelengths. (Channel Spacing), so the following is to calculate the relationship between the grating and the channel spacing using different periods without changing the architecture. The first implementation of the upload link architecture diagram is shown in Figure 6C, where, 𝑦1 is the angle between the programmable diffraction element (LCoS in this embodiment) and the vertical plane, 𝑥1 is the angle between the grating element (grating) and the vertical plane, and 𝜃 𝑚𝐺 is the normal line of the beam after it is emitted from the grating The included angle, 𝜃 𝑚𝐿 is the angle between the beam and the normal of the programmable diffractive element. Since this structure is the same as the previous one, other parts are omitted. This embodiment directly calculates the relationship between the grating and the channel spacing using different periods. According to the reflection type grating equation (Equation 5), the following formula can be obtained: 𝐷 𝐺 (sin𝜃 𝑖 +sin𝜃 1 )=λ 1 (Equation 9) 𝐷 𝐺 (sin𝜃 𝑖 +sin𝜃 2 )=λ 1 +Δλ (Equation 10 ) Where 𝐷 𝐺 is the grating period, 𝜃 𝑖 the incident angle of the grating, 𝜃 1 and 𝜃 2 are respectively λ 1 and λ 1 + Δλ first-order diffraction angle, λ 1 is the wavelength, Δλ is the channel spacing, and then Subtracting Equation 10 from Equation 9 can get the following formula: 𝐷 𝐺 (sin𝜃 2 −sin𝜃 1 )=Δλ (Equation 11) And in this architecture, it is assumed that the largest light spot (RMS Spot Radius) is distributed on the programmable diffraction element It is 371.648μm, (λ 1 + ∆λ=1530nm). Therefore, when calculating the grating period and the channel spacing, it is necessary to consider the two adjacent wavelengths under the conditions of the channel spacing of ∆λ and the grating period of 𝐷 𝐺 At least one spot distance must be separated on the programmable diffraction element, so 𝜃 2 − 𝜃 1 must meet the condition of "𝜃 2 − 𝜃 1 ≥ 0.45°".
故以可程式化繞射元件上光斑最大之波長(λ1 + ∆λ = 1530nm)做為限制,當λ1 + ∆λ = 1530nm時,𝜃2 = 48.1035°、𝜃1 = 47.6533°,而光柵週期與波道間距之關係如以下公式: 𝐷𝐺 (sin48.1035° − sin47.6533°) = ∆λ (公式12)Therefore, the maximum wavelength of the light spot on the programmable diffraction element (λ 1 + ∆λ = 1530nm) is used as the limit. When λ 1 + ∆λ = 1530nm, 𝜃 2 = 48.1035°, 𝜃 1 = 47.6533°, and grating The relationship between period and channel spacing is as follows: 𝐷 𝐺 (sin48.1035° − sin47.6533°) = ∆λ (Formula 12)
而上載鏈路之第一實施所使用之光柵週期密度為 600/mm,即換算得之光柵週期(𝐷𝐺
)為 1.67μm,並將光柵週期(𝐷𝐺
)代入公式12中可以得出波道間距(Channel Spacing) ∆λ為 8.801nm,而若欲將此架構可支援之波道間距縮小至 DWDM波道間距規範之 0.8nm,則必須更換光柵週期(𝐷𝐺
)為 0.1518μm 之光柵,換算回光柵週期密度則為 6587.615/mm,且由上述結果可以得知使用週期越小的光柵於此架構則可使此架構可使用之波道間距越小。The first implementation of the upload link uses a grating period density of 600/mm, that is, the converted grating period (𝐷 𝐺 ) is 1.67μm, and the grating period (𝐷 𝐺 ) is substituted into
另外該波長分離元件15亦能夠為一反射式全像光柵(Reflective Holographic Grating),而對應於該光接收模組17係為一多模光纖陣列(Fiber Ribbon),如第7、8A及8B圖所示,必須在此兩個繞射元件中加入一半波片16以控制波束從第一個繞射元件出射後再入射至第二個繞射元件時之極化方向,因此波束經由上載鏈路傳輸回無線光通訊節點系統時,先經過固定周期之反射型全像式光柵將不同載波波長分離入射至可程式化繞射元件,並藉由控制可程式化繞射元件之空間光調製器執行相位型閃耀光柵之功能以控制各波長之波束產生不同繞射角出射,藉此使得各波長能在無線光通訊節點系統處達到波長選擇及交換之效。無線光通訊節點端之光接收模組係為一多模光纖陣列。In addition, the
其中 上載鏈路 之第二實施說明如下
: 在系統上載鏈路之第二實施,由於光柵之週期以及可程式化繞射元件之尺寸會限制了系統所使用之光源波長與波長間之波道間距(Channel Spacing),故以下則針對在不改變架構之情形下,計算其使用不同週期之光柵與波道間距之關係,而第二實施之上載鏈路架構示意圖如第8C圖所示,其中,𝑦3為可程式化繞射元件(本實施例為LCoS)擺放與垂直面之夾角、𝑥3為Grating 元件(光柵)擺放與垂直面之夾角、𝜃𝑚𝐺
為波束由光柵出射後與光柵法線之夾角、𝜃𝑚𝐿
為波束與可程式化繞射元件之法線夾角; 由於此架構與前述相同,故省略其他部份,本實施例則直接計算使用不同週期之光柵與波道間距之關係,而根據反射型光柵方程式(公式5)之使用可得公式9及公式10,之後再將公式10減去公式9可得以下公式11; Wherein the second link upload embodiment described as follows: a second embodiment of the carrier of the link on the system, since the size of the grating period of the diffractive element and a programmable limit of the channel between the source wavelength and the wavelength spacing used in the system (Channel Spacing), so the following is to calculate the relationship between grating and channel spacing using different periods without changing the architecture. The second implementation of the upload link architecture is shown in Figure 8C, where, 𝑦3 is the angle between the programmable diffraction element (LCoS in this example) and the vertical plane, 𝑥3 is the angle between the grating element (grating) and the vertical plane, 𝜃 𝑚𝐺 is the normal line of the beam with the grating after being emitted from the grating The included angle, 𝜃 𝑚𝐿 is the angle between the beam and the normal of the programmable diffractive element. Since this structure is the same as the previous one, other parts are omitted. This embodiment directly calculates the relationship between the grating and the channel spacing using different periods. According to the reflection type grating equation (Equation 5), Equation 9 and Equation 10 can be obtained, and then Equation 10 is subtracted from Equation 9 to obtain the following
而在此架構中假設分布在可程式化繞射元件上最大之光斑(RMS Spot Radius)為 458.019μm, (λ1 + ∆λ=1550nm)故在計算光柵週期與波道間距時,必須考慮在∆λ之波道間距與𝐷𝐺 之光柵週期條件下,波道間距相鄰之兩波長必須在可程式化繞射元件上至少能分離一個光斑之間距,故𝜃2 − 𝜃1 必須滿足 「𝜃2 − 𝜃1 ≥ 0.3361°」的條件。In this architecture, it is assumed that the largest spot (RMS Spot Radius) distributed on the programmable diffractive element is 458.019μm, (λ 1 + ∆λ=1550nm). Therefore, when calculating the grating period and channel spacing, it must be considered Under the condition of the channel spacing of ∆λ and the grating period of 𝐷 𝐺 , the two adjacent wavelengths of the channel spacing must be separated by at least one spot distance on the programmable diffraction element, so 𝜃 2 − 𝜃 1 must meet "𝜃 2 − 𝜃 1 ≥ 0.3361°”.
故以可程式化繞射元件上光斑最大之波長(λ1 + ∆λ = 1550nm)做為限制,當λ1 + ∆λ = 1550nm時,𝜃2 = 66.5143°、𝜃1 = 66.1782°而光柵週期與波道間距之關係如以下公式: 𝐷𝐺 (sin66.5143° − sin66.1782°) = ∆λ (公式13)Therefore, the maximum wavelength of the light spot on the programmable diffraction element (λ 1 + ∆λ = 1550nm) is used as the limit. When λ 1 + ∆λ = 1550nm, 𝜃 2 = 66.5143°, 𝜃 1 = 66.1782° and the grating period The relationship with the channel spacing is as follows: 𝐷 𝐺 (sin66.5143° − sin66.1782°) = ∆λ (Formula 13)
而上載鏈路之第二實施所使用之光柵週期密度為 1100/mm,即換算得之光柵週期(𝐷𝐺
)為 0.909μm,並將光柵週期(𝐷𝐺
)代入公式13中可以得出波道間距(Channel Spacing) ∆λ為 2.14nm,而若欲將此架構可支援之波道間距縮小至 DWDM波道間距規範之 0.8nm,則必須更換光柵週期(𝐷𝐺
)為 0.3399μm 之光柵,換算回光柵週期密度則為 2942.042/mm,且由上述結果可以得知使用週期越小的光柵於此架構則可使此架構可使用之波道間距越小。The second implementation of the upload link uses a grating period density of 1100/mm, that is, the converted grating period (𝐷 𝐺 ) is 0.909μm, and substituting the grating period (𝐷 𝐺 ) into
本發明所提供之分波多工雙向傳輸接取系統,與其他習用技術相互比較時,其優點如下: (1) 本發明能夠使用可程式化繞射元件之空間光調製器作為動態繞射元件,並透過可程式化繞射元件之空間光調製器之控制針對入射光束進行重新配置輸出波束寬度及位置,如此將能夠達到雙向無線光通訊系統節點之目的,並透過上述系統來改善傳統之系統架構彈性不足之缺點。 (2) 本發明能夠將可程式化繞射元件之空間光調製器應用於無線光通訊系統中構成無線光通訊節點時,在光纖網路端則可利用其對於入射光束之重新配置能力建構一具波長選擇及交換能力之波長選擇系統(Wavelength Selective System),而在用戶端的部分則可利用其相位調變之特性將不同波長之波束進行擴/縮束以及改變其傳播方向。Compared with other conventional technologies, the advantages of the division-wave multiplexing bidirectional transmission and access system provided by the present invention are as follows: (1) The present invention can use a spatial light modulator with programmable diffractive elements as dynamic diffractive elements. And through the control of the spatial light modulator of the programmable diffractive element, the output beam width and position are reconfigured for the incident beam. This will achieve the purpose of the two-way wireless optical communication system node, and improve the traditional system architecture through the above system The disadvantage of insufficient flexibility. (2) The present invention can apply a spatial light modulator with programmable diffractive elements to a wireless optical communication system to form a wireless optical communication node. At the fiber optic network end, it can use its ability to reconfigure the incident beam to construct a A Wavelength Selective System with wavelength selection and switching capabilities. At the user end, it can use its phase modulation characteristics to expand/contract beams of different wavelengths and change their propagation direction.
本發明已透過上述之實施例揭露如上,然其並非用以限定本發明,任何熟悉此一技術領域具有通常知識者,在瞭解本發明前述的技術特徵及實施例,並在不脫離本發明之精神和範圍內,當可作些許之更動與潤飾,因此本發明之專利保護範圍須視本說明書所附之請求項所界定者為準。The present invention has been disclosed above through the above-mentioned embodiments, but it is not intended to limit the present invention. Anyone familiar with this technical field with ordinary knowledge should understand the aforementioned technical features and embodiments of the present invention without departing from the scope of the present invention. Within the spirit and scope, some changes and modifications can be made. Therefore, the patent protection scope of the present invention shall be subject to the definition of the claims attached to this specification.
1:無線光通訊節點端 11:光發射模組 12:波束擴展器 13:波束準直器 14:空間光調變器 15:波長分離元件 16:半波片 17:光接收模組 18:波束聚焦器 2:光終端機 21:光偵測接收器 22:波束聚焦器 23:光發射模組 24:波束擴展器 25:波束準直器 1: Wireless optical communication node end 11: Light emission module 12: Beam expander 13: Beam collimator 14: Spatial light modulator 15: Wavelength separation element 16: Half wave plate 17: Optical receiving module 18: beam focuser 2: Optical terminal 21: Light detection receiver 22: beam focuser 23: light emitting module 24: beam expander 25: Beam collimator
[第1A圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第一實施之整體架構示意圖。 [第1B圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第一實施之無線光通訊節點端之架構示意圖。 [第1C圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第一實施之光終端機之架構示意圖。 [第2A圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第一實施之實際運作架構示意圖。 [第2B圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第一實施之下載鏈路架構示意圖。 [第3圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第二實施之無線光通訊節點端之架構示意圖。 [第4A圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第二實施之實際運作架構示意圖。 [第4B圖]係本發明分波多工雙向傳輸接取系統之下載鏈路之第二實施之下載鏈路架構示意圖。 [第5A圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第一實施之整體架構示意圖。 [第5B圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第一實施之無線光通訊節點端之架構示意圖。 [第5C圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第一實施之光終端機之架構示意圖。 [第6A圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第一實施之實際運作架構示意圖。 [第6B圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第一實施之另一實際運作架構示意圖。 [第6C圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第一實施之上載鏈路架構示意圖。 [第7圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第二實施之無線光通訊節點端之架構示意圖。 [第8A圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第二實施之實際運作架構示意圖。 [第8B圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第二實施之另一實際運作架構示意圖。 [第8C圖]係本發明分波多工雙向傳輸接取系統之上載鏈路之第二實施之上載鏈路架構示意圖。[Figure 1A] is a schematic diagram of the overall architecture of the first implementation of the download link of the DWDM bidirectional transmission access system of the present invention. [Figure 1B] is a schematic diagram of the architecture of the wireless optical communication node end of the first implementation of the download link of the split-wave multiplexing two-way transmission and access system of the present invention. [Figure 1C] is a schematic diagram of the optical terminal structure of the first implementation of the download link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 2A] is a schematic diagram of the actual operation architecture of the first implementation of the download link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 2B] is a schematic diagram of the download link architecture of the first implementation of the download link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 3] is a schematic diagram of the architecture of the wireless optical communication node end of the second implementation of the download link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 4A] is a schematic diagram of the actual operation architecture of the second implementation of the download link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 4B] is a schematic diagram of the download link architecture of the second implementation of the download link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 5A] is a schematic diagram of the overall architecture of the first implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 5B] is a schematic diagram of the architecture of the wireless optical communication node end of the first implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 5C] is a schematic diagram of the architecture of the optical terminal of the first implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 6A] is a schematic diagram of the actual operation architecture of the first implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 6B] is a schematic diagram of another actual operation architecture of the first implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 6C] is a schematic diagram of the upload link architecture of the first implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 7] is a schematic diagram of the architecture of the wireless optical communication node end of the second implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 8A] is a schematic diagram of the actual operation architecture of the second implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 8B] is a schematic diagram of another actual operational architecture of the second implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention. [Figure 8C] is a schematic diagram of the upload link architecture of the second implementation of the upload link of the split-wave multiplexing bidirectional transmission and access system of the present invention.
1:無線光通訊節點端 1: Wireless optical communication node end
11:光發射模組 11: Light emission module
12:波束擴展器 12: Beam expander
13:波束準直器 13: Beam collimator
14:空間光調變器 14: Spatial light modulator
15:波長分離元件 15: Wavelength separation element
2:光終端機 2: Optical terminal
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