TW202145741A

TW202145741A - Optical modulating device comprising an optical splitter, an optical phase modulator, and an optical combiner

Info

Publication number: TW202145741A
Application number: TW109117359A
Authority: TW
Inventors: 蔡坤廷; 莊榮敏
Original assignee: 美商莫仕有限公司
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-12-01
Also published as: TWI762933B

Abstract

An optical modulating device is disclosed, which includes an optical splitter, an optical phase modulator, and an optical combiner. The optical splitter splits an inputting optical signal by an optical splitting ratio to generate a first split optical signal and a second split optical signal. The optical phase modulator phase modulates the first split optical signal and the second split optical signal to respectively generate a first modulating optical signal and a second modulating optical signal. The optical combiner combines the first modulating optical signal and the second modulating optical signal by a combining ratio to generate an outputting optical signal having a chirp, the combining ratio being equal to the optical splitting ratio, the value of the combining ratio being a positive number, and the value being less than one or more than one.

Description

光調變裝置light modulation device

本發明是有關於一種裝置，特別是指一種光調變裝置。The present invention relates to a device, in particular to a light modulation device.

在光纖通訊系統中，光纖色散係一種因波速與其波長之相依性而令光波分散成不同波長的光譜成分的現象。當光調變裝置所發出的光信號或脈衝投射至如光纖通道中時，其之波封沿著光纖通道以波群速度傳播至光接收裝置。由於此脈衝包含一系列的光譜成分，各光譜成分以不同的波群速度前進，造成波群速度色散（Group velocity dispersion，GVD）、模內（intramodal）色散，或簡單地光纖色散。這個色散現象亦常稱為脈衝展寬。當脈衝沿著光纖前進，光譜成分在空間與時間上持續分散，使得脈衝變得太寬，一脈衝之前緣與上一個脈衝之後緣重疊，則會發生符號間干擾（Inter symbol interference，ISI）並導致位元模糊，造成光接收裝置於接收到光信號並據以進行解調時，其無法分辨出「0」位元與「1」位元間的差異而發生解調錯誤。此外，光纖的色散與光纖的長度成正比，也就是說，光信號的傳輸距離受到光纖色散的限制。另外，光接收裝置所接收到的光信號的一訊雜比（signal-to-noise ratio，SNR）好壞也會影響光接收裝置的解調準確度。In optical fiber communication systems, fiber dispersion is a phenomenon in which light waves are dispersed into spectral components of different wavelengths due to the dependence of the wave speed and its wavelength. When the optical signal or pulse emitted by the optical modulation device is projected into, for example, a fiber channel, its envelope propagates along the fiber channel to the light receiving device at a wave group velocity. Because this pulse contains a series of spectral components, each advancing at a different group velocity, resulting in group velocity dispersion (GVD), intramodal dispersion, or simply fiber dispersion. This dispersion phenomenon is also often referred to as pulse broadening. As the pulse travels along the fiber, the spectral components continue to be dispersed in space and time, making the pulse too wide, and the leading edge of a pulse overlaps with the trailing edge of the previous pulse, resulting in inter-symbol interference (ISI) and As a result, the bits are blurred, and when the optical receiving device receives and demodulates the optical signal, it cannot distinguish the difference between the "0" bit and the "1" bit, and a demodulation error occurs. In addition, the dispersion of the fiber is proportional to the length of the fiber, that is, the transmission distance of the optical signal is limited by the dispersion of the fiber. In addition, the signal-to-noise ratio (SNR) of the optical signal received by the optical receiving device also affects the demodulation accuracy of the optical receiving device.

如此一來，光信號的訊雜比好壞及光纖色散便成為影響光纖通訊的信號品質的重要因素之一。因此，如何避免光信號的訊雜比太低及光纖色散對光纖通訊系統造成嚴重影響，以提升光傳輸距離，為相關通訊業者所欲改善的課題。As a result, the signal-to-noise ratio of the optical signal and the optical fiber dispersion have become one of the important factors affecting the signal quality of the optical fiber communication. Therefore, how to prevent the signal-to-noise ratio of the optical signal from being too low and the optical fiber dispersion to seriously affect the optical fiber communication system, so as to increase the optical transmission distance, is a subject that the related communication industry wants to improve.

因此，本發明的一目的，即在提供一種能夠克服先前技術之缺點的光調變裝置。Therefore, an object of the present invention is to provide an optical modulation device that can overcome the shortcomings of the prior art.

於是，本發明光調變裝置包含一分光器、一光相位調變器，及一光結合器。Therefore, the optical modulation device of the present invention includes an optical splitter, an optical phase modulator, and an optical combiner.

該分光器用於接收一輸入光信號，並將該輸入光信號以一分光比進行分光，以產生一第一分光信號及一第二分光信號。The optical splitter is used for receiving an input optical signal and splitting the input optical signal with a splitting ratio to generate a first splitting signal and a second splitting signal.

該光相位調變器耦接該分光器以接收該等第一及第二分光信號，且將該等第一及第二分光信號進行相位調變，以分別產生一第一調變光信號及一第二調變光信號。The optical phase modulator is coupled to the optical splitter to receive the first and second split optical signals, and perform phase modulation on the first and second split optical signals to generate a first modulated optical signal and a second modulated optical signal.

該光結合器耦接該光相位調變器以接收該等第一及第二調變光信號，並將該等第一及第二調變光信號以一結合比進行結合，以產生一具有一啁啾的輸出光信號，該結合比等於該分光比，該結合比的一比值為正數，且該比值為小於一及大於一之二者其中之一。The optical combiner is coupled to the optical phase modulator to receive the first and second modulated optical signals, and combine the first and second modulated optical signals at a combining ratio to generate a For a chirped output optical signal, the combining ratio is equal to the splitting ratio, a ratio of the combining ratio is a positive number, and the ratio is one of less than one and greater than one.

本發明的功效在於：藉由使該分光比等於該光結合比，使得該輸出光信號具有較好的訊雜比，以致接收到該輸出光信號的光接收裝置據以進行解調時，具有較佳的解調準確度，且該輸出光信號具有該啁啾，可降低光纖引起的色散對該輸出光信號的傳輸所造成的影響，進而提升光通訊系統之傳輸性能。The effect of the present invention is: by making the optical splitting ratio equal to the optical combining ratio, the output optical signal has a better signal-to-noise ratio, so that when the optical receiving device receiving the output optical signal performs demodulation, it has The better demodulation accuracy and the chirp of the output optical signal can reduce the influence of dispersion caused by the optical fiber on the transmission of the output optical signal, thereby improving the transmission performance of the optical communication system.

在本發明被詳細描述之前，應當注意在以下的說明內容中，類似的元件是以相同的編號來表示。Before the present invention is described in detail, it should be noted that in the following description, similar elements are designated by the same reference numerals.

>第一實施例>>First Embodiment>

參閱圖1，本發明光調變裝置1的一實施例適用於一光通訊系統（圖未示）。該光通訊系統包括一光纖（圖未示）及一光接收裝置（圖未示）。該光調變裝置1用來將一呈連續波（Continuous wave）的一輸入光信號Oin進行調變，以產生並發射出一具有一啁啾（chirp）的輸出光信號Oout，並將該輸出光信號Oout經由該光纖傳送至該光接收裝置。該光接收裝置再將其所接收到的該輸出光信號Oout進行解調處理。Referring to FIG. 1 , an embodiment of the optical modulation device 1 of the present invention is suitable for an optical communication system (not shown). The optical communication system includes an optical fiber (not shown) and a light receiving device (not shown). The optical modulation device 1 is used for modulating an input optical signal Oin in the form of a continuous wave, so as to generate and emit an output optical signal Oout with a chirp, and convert the output optical signal The signal Oout is transmitted to the light receiving device via the optical fiber. The optical receiving device then demodulates the received output optical signal Oout.

本實施例之該光調變裝置1包含一分光器11、一光相位調變器12，及一光結合器13。該光調變裝置1為一馬赫-詹德調變器（Mach-Zehnder modulator，MZM），該馬赫-詹德調變器由一鈮酸鋰基（LiNbO3-based）、一矽（Silicon）及一磷化銦（Inp）中的一者所製成。The optical modulation device 1 of this embodiment includes an optical splitter 11 , an optical phase modulator 12 , and an optical combiner 13 . The light modulation device 1 is a Mach-Zehnder modulator (MZM), and the Mach-Zehnder modulator is composed of a lithium niobate (LiNbO3-based), a silicon (Silicon) and Made of one of indium phosphide (Inp).

該分光器11用於接收該輸入光信號Oin，並將該輸入光信號Oin以一分光比（即，

1:(1-

1)，0>

1>1）進行分光，以產生一第一分光信號Os1及一第二分光信號Os2。需補充說明的是，在本實施例中，該分光器11為一光定向耦合器（Optical directional coupler），且僅接收該輸入光信號Oin，但不限於此。在其他實施例中，該分光器11的一輸入端111接收該輸入光信號Oin，而另一輸入端112接收另一輸入光信號。該分光器11可為一Y分支波導（Y-branch waveguide）或一多模干涉儀（multi-mode interferometer）。The optical splitter 11 is configured to receive the input optical signal Oin, and divide the input optical signal Oin with a split ratio (ie,

1:(1-

1), 0>

1>1) Perform optical splitting to generate a first split optical signal Os1 and a second split optical signal Os2. It should be added that, in this embodiment, the optical splitter 11 is an optical directional coupler, and only receives the input optical signal Oin, but is not limited thereto. In other embodiments, one input terminal 111 of the optical splitter 11 receives the input optical signal Oin, and the other input terminal 112 receives another input optical signal. The optical splitter 11 can be a Y-branch waveguide or a multi-mode interferometer.

該光相位調變器12耦接該分光器11以接收該等第一及第二分光信號Os1、Os2，且將該等第一及第二分光信號Os1、Os2進行相位調變，以分別產生一第一調變光信號Om1及一第二調變光信號Om2。在本實施例中，該光相位調變器12包括一第一波導121、一第二波導122、一第一電極123、一第二電極124，及一偏壓電極125。The optical phase modulator 12 is coupled to the optical splitter 11 to receive the first and second optical splitting signals Os1 and Os2, and perform phase modulation on the first and second splitting optical signals Os1 and Os2 to respectively generate A first modulated optical signal Om1 and a second modulated optical signal Om2. In this embodiment, the optical phase modulator 12 includes a first waveguide 121 , a second waveguide 122 , a first electrode 123 , a second electrode 124 , and a bias electrode 125 .

該第一波導121耦接在該分光器11與該光結合器13之間，接收來自該分光器11的該第一分光信號Os1，並據以產生該第一調變光信號Om1。該第二波導122耦接在該分光器11與該光結合器13之間，接收來自該分光器11的該第二分光信號Os2，並據以產生該第二調變光信號Om2。該第一電極123與該第一波導121對應設置，且用於接收一第一調變電壓V1。該第二電極124與該第二波導122對應設置，且用於接收一第二調變電壓V2。詳細來說，該等第一及第二電極123、124是分別設置在該等第一及第二波導121、122的上表面。該等第一及第二電極123、124分別根據該等第一及第二調變電壓V1、V2，使得該等第一及第二波導121、122各自的自身折射率產生變化（例如，根據該等第一及第二調變電壓V1、V2產生熱來使該等第一及第二波導121、122各自的折射率改變，但不限於此），以致該等第一及第二波導121、122所分別傳播的該等第一及第二分光信號Os1、Os2的傳播速度改變（即該等第一及第二波導121、122中傳播的光之間產生相位差(進行相位調製)），並分別產生該等第一及第二調變光信號Om1、Om2。如此一來，該等第一及第二調變光信號Om1、Om2的相位分別隨該等第一及第二調變電壓V1、V2的變化而改變。The first waveguide 121 is coupled between the optical splitter 11 and the optical combiner 13 , receives the first split optical signal Os1 from the optical splitter 11 , and generates the first modulated optical signal Om1 accordingly. The second waveguide 122 is coupled between the optical splitter 11 and the optical combiner 13 , receives the second split optical signal Os2 from the optical splitter 11 , and generates the second modulated optical signal Om2 accordingly. The first electrode 123 is disposed corresponding to the first waveguide 121 and is used for receiving a first modulated voltage V1. The second electrode 124 is disposed corresponding to the second waveguide 122 and is used for receiving a second modulated voltage V2. Specifically, the first and second electrodes 123 and 124 are respectively disposed on the upper surfaces of the first and second waveguides 121 and 122 . The first and second electrodes 123, 124 are respectively modulated according to the first and second voltages V1, V2, so that the respective refractive indices of the first and second waveguides 121, 122 are changed (for example, according to The first and second modulated voltages V1, V2 generate heat to change the respective refractive indices of the first and second waveguides 121, 122, but not limited thereto), so that the first and second waveguides 121 The propagation speeds of the first and second split optical signals Os1 and Os2 respectively propagated by 122 and 122 change (that is, a phase difference (phase modulation) is generated between the lights propagating in the first and second waveguides 121 and 122 ) , and respectively generate the first and second modulated optical signals Om1 and Om2. In this way, the phases of the first and second modulated optical signals Om1, Om2 change with the changes of the first and second modulated voltages V1, V2, respectively.

該偏壓電極125與該第二波導122及該第二電極124對應設置（或，該偏壓電極125與該第一波導121及該第一電極123對應設置），且用於接收一偏壓信號Vb。The bias electrode 125 is arranged corresponding to the second waveguide 122 and the second electrode 124 (or the bias electrode 125 is arranged corresponding to the first waveguide 121 and the first electrode 123 ), and is used to receive a bias voltage signal Vb.

詳細來說，該輸出光信號Oout的該啁啾的極性是相關於該光調變裝置1操作在其自身的一轉移函數（Transfer Function）的正斜率或負斜率，而該輸出光信號Oout的該啁啾的大小是相關於該光調變裝置1的一偏壓點與該轉移函數的一正交點間的偏移。因此，本實施例藉由使該光相位調變器12受該偏壓信號Vb控制而調整該光調變裝置1操作在該轉移函數的正斜率或負斜率，以改變該啁啾的極性，並藉由該偏壓信號Vb將該偏壓點偏離該轉移函數的該正交點，以改變該啁啾的大小，以致該輸出光信號Oout的該啁啾隨該偏壓信號Vb的變化而改變。Specifically, the polarity of the chirp of the output optical signal Oout is related to the positive slope or negative slope of a transfer function (Transfer Function) of the optical modulation device 1 operating in itself, and the output optical signal Oout has a positive slope or a negative slope. The magnitude of the chirp is related to the offset between a bias point of the light modulation device 1 and an orthogonal point of the transfer function. Therefore, in this embodiment, the optical phase modulator 12 is controlled by the bias signal Vb to adjust the positive slope or negative slope of the transfer function of the optical modulation device 1 to change the polarity of the chirp. And the bias point is deviated from the quadrature point of the transfer function by the bias signal Vb to change the size of the chirp, so that the chirp of the output optical signal Oout changes with the change of the bias signal Vb. Change.

該光結合器13耦接該光相位調變器12以接收該等第一及第二調變光信號Om1、Om2，並將該等第一及第二調變光信號Om1、Om2以一結合比（即，

2:(1-

2)，0>

2>1）進行結合，以產生該輸出光信號Oout。需注意的是，該結合比與該分光比皆為定值。該結合比等於該分光比（即，

1:(1-

1)=

2:(1-

2)），該結合比的一比值為正數，且該比值為小於一及大於一之二者其中之一。此外，在本實施例中，該光結合器13為一光定向耦合器，且僅輸出該輸出光信號Oout，但不限於此。在其他實施例中，該光結合器13的一輸出端131輸出該輸出光信號Oout，而另一輸出端132輸出另一輸出光信號。該輸出光信號Oout與該另一輸出光信號可具有不同的啁啾。該光結合器13可為一Y分支波導或一多模干涉儀。The optical combiner 13 is coupled to the optical phase modulator 12 to receive the first and second modulated optical signals Om1, Om2, and combine the first and second modulated optical signals Om1, Om2 with a than (ie,

2:(1-

2), 0>

2>1) combine to generate the output optical signal Oout. It should be noted that the combination ratio and the splitting ratio are both fixed values. The combining ratio is equal to the splitting ratio (ie,

1:(1-

1)=

2:(1-

2)), a ratio of the combination ratio is a positive number, and the ratio is one of less than one and greater than one. In addition, in this embodiment, the optical combiner 13 is an optical directional coupler, and only outputs the output optical signal Oout, but it is not limited thereto. In other embodiments, one output terminal 131 of the optical combiner 13 outputs the output optical signal Oout, and the other output terminal 132 outputs another output optical signal. The output optical signal Oout and the other output optical signal may have different chirps. The optical combiner 13 can be a Y-branch waveguide or a multimode interferometer.

在本實施例中，該等第一及第二調變電壓V1、V2的振幅相同，且該等第一及第二調變電壓V1、V2的相位相差180度。該輸出光信號Oout的一光調製幅度（Optical Modulation Amplitude，OMA）可由下式(1)獲得：

式(1)，其中，參數OMA是該光調製幅度，參數Po,max、Po,min分別是該輸出光信號Oout的一最大光功率及一最小光功率，參數

為該分光比中的第一數值，參數

為該結合比中的第一數值，參數Pin是該輸入光信號Oin的一光功率。根據式(1)可知該輸出光信號Oout的該光調製幅度OMA相關於該分光比及該結合比，因此本發明在確定該輸入光信號Oin的波長及傳輸距離並得知其所對應的一光纖色散量時，根據該光纖色散量選定該輸出光信號Oout的該啁啾，並藉由調整該偏壓信號Vb來獲得所需的該啁啾，且以一方式預先設定該分光比及該結合比，使得該輸出光信號Oout具有該啁啾的同時該光調製幅度OMA最大化。如此一來，該輸出光信號Oout經由該光纖傳輸至該光接收裝置時仍具有較好的訊雜比（signal-to-noise ratio，SNR）。In this embodiment, the amplitudes of the first and second modulation voltages V1 and V2 are the same, and the phases of the first and second modulation voltages V1 and V2 differ by 180 degrees. An optical modulation amplitude (Optical Modulation Amplitude, OMA) of the output optical signal Oout can be obtained by the following formula (1):

Equation (1), where the parameter OMA is the optical modulation amplitude, the parameters Po,max, Po,min are a maximum optical power and a minimum optical power of the output optical signal Oout respectively, and the parameters

is the first value in the splitting ratio, the parameter

is the first value in the combining ratio, and the parameter Pin is an optical power of the input optical signal Oin. According to formula (1), it can be known that the optical modulation amplitude OMA of the output optical signal Oout is related to the splitting ratio and the combining ratio, so the present invention determines the wavelength and transmission distance of the input optical signal Oin and knows the corresponding one When the amount of fiber dispersion is selected, the chirp of the output optical signal Oout is selected according to the amount of fiber dispersion, and the required chirp is obtained by adjusting the bias signal Vb, and the splitting ratio and the The combination ratio is such that the optical modulation amplitude OMA is maximized while the output optical signal Oout has the chirp. In this way, the output optical signal Oout still has a good signal-to-noise ratio (SNR) when transmitted to the optical receiving device through the optical fiber.

參閱圖2及圖3，圖2說明在不同的該啁啾情況下（圖中以一參數

作為該輸出光信號Oout的該啁啾），該分光比中的第一數值

與該結合比中的第一數值

間的關係。圖3說明在不同的該啁啾情況下，該分光比中的第一數值

與該輸出光信號Oout的該光調製幅度OMA間的關係。從圖2及圖3可知，在不同的該啁啾情況下，當該分光比中的第一數值

等於該結合比中的第一數值

時（即，

），該輸出光信號Oout的該光調製幅度OMA具有一最大值。因此，本發明藉由確定所需的該啁啾，並取得一對應且相同的該分光比及該結合比來預先設定該光調變裝置1，使得該輸出光信號Oout具有該啁啾的同時該光調製幅度OMA最大化，以改善光鏈路預算（Optical link budget）。Referring to Figure 2 and Figure 3, Figure 2 illustrates the chirp under different conditions (in the figure a parameter

As the chirp of the output optical signal Oout), the first value in the split ratio

with the first value in the binding ratio

relationship between. Figure 3 illustrates the first value in the split ratio under different conditions of the chirp

relationship with the optical modulation amplitude OMA of the output optical signal Oout. It can be seen from FIG. 2 and FIG. 3 that under different chirp cases, when the first value in the split ratio

is equal to the first value in the combination ratio

when (ie,

), the optical modulation amplitude OMA of the output optical signal Oout has a maximum value. Therefore, the present invention presets the optical modulation device 1 by determining the required chirp and obtaining a corresponding and identical splitting ratio and the combining ratio, so that the output optical signal Oout has the chirp at the same time The optical modulation amplitude OMA is maximized to improve the optical link budget.

>第二實施例>>Second Embodiment>

參閱圖4，本發明光調變裝置1的第二實施例與該第一實施例相似，二者不同之處在於，該第二實施例中：(1)該分光比與該結合比非定值（即，非預先設定好）；及(2)該光調變裝置1還包含一比例調整器14。Referring to FIG. 4 , the second embodiment of the optical modulation device 1 of the present invention is similar to the first embodiment, and the difference between the two is that in the second embodiment: (1) the light splitting ratio and the combining ratio are not fixed value (ie, not preset); and (2) the light modulation device 1 further includes a proportional adjuster 14 .

該比例調整器14用於接收一可變的直流電壓Vdc，並根據該直流電壓Vdc調整該分光比與該結合比的比例。在本實施例中，該比例調整器14包括一第一電極141，及一第二電極142。該第一電極141與該分光器11對應且鄰近設置，且用於接收該直流電壓Vdc。該第二電極142與該光結合器13對應且鄰近設置，且用於接收該直流電壓Vdc。詳細來說，該等第一及第二電極141、142各自根據該直流電壓Vdc產生熱，以調整各自所對應的該分光比與該結合比的比例。在本實施例中，該結合比同樣等於該分光比，該結合比的該比值為正數，且該比值為小於一及大於一之二者其中之一。The proportional regulator 14 is used for receiving a variable DC voltage Vdc, and adjusting the ratio of the splitting ratio to the combining ratio according to the DC voltage Vdc. In this embodiment, the proportional regulator 14 includes a first electrode 141 and a second electrode 142 . The first electrode 141 corresponds to and adjacent to the optical splitter 11 and is used for receiving the DC voltage Vdc. The second electrode 142 corresponds to and adjacent to the optical combiner 13 and is used for receiving the DC voltage Vdc. In detail, each of the first and second electrodes 141 and 142 generates heat according to the DC voltage Vdc, so as to adjust the corresponding ratio of the splitting ratio and the combining ratio. In this embodiment, the combining ratio is also equal to the splitting ratio, the ratio of the combining ratio is a positive number, and the ratio is one of less than one and greater than one.

綜上所述，本發明光調變裝置1藉由使該分光比等於該光結合比，使其所輸出的該輸出光信號Oout具有較大的光調製幅度OMA，使得該輸出光信號Oout經由該光纖傳輸至該光接收裝置時仍具有較好的訊雜比，以致該光接收裝置根據該輸出光信號Oout進行解調時具有較佳的解調準確度。此外，該光調變裝置1藉由使該輸出光信號Oout具有優化的該啁啾，可降低該光纖引起的色散對該輸出光信號Oout的傳輸所造成的影響，進而提升該光通訊系統之傳輸性能，並增加光傳輸距離。To sum up, the optical modulation device 1 of the present invention makes the optical splitting ratio equal to the optical combining ratio, so that the output optical signal Oout has a larger optical modulation amplitude OMA, so that the output optical signal Oout can pass through The optical fiber still has a better signal-to-noise ratio when it is transmitted to the light receiving device, so that the light receiving device has better demodulation accuracy when demodulating according to the output optical signal Oout. In addition, the optical modulation device 1 can reduce the influence of dispersion caused by the optical fiber on the transmission of the output optical signal Oout by making the output optical signal Oout have the optimized chirp, thereby improving the performance of the optical communication system. transmission performance and increase the optical transmission distance.

惟以上所述者，僅為本發明的實施例而已，當不能以此限定本發明實施的範圍，凡是依本發明申請專利範圍及專利說明書內容所作的簡單的等效變化與修飾，皆仍屬本發明專利涵蓋的範圍內。However, the above are only examples of the present invention, and should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still included in the scope of the present invention. within the scope of the invention patent.

1:光調變裝置 11:分光器 111、112:輸入端 12:光相位調變器 121:第一波導 122:第二波導 123:第一電極 124:第二電極 125:偏壓電極 13:光結合器 131、132:輸出端 14:比例調整器 141:第一電極 142:第二電極 V1:第一調變電壓 V2:第二調變電壓 Vb:偏壓信號 Vdc:直流電壓 Oin:輸入光信號 Oout:輸出光信號 Om1:第一調變光信號 Om2:第二調變光信號 Os1:第一分光信號 Os2:第二分光信號 OMA:光調製幅度

1:分光比中的第一數值

2:結合比中的第一數值

:啁啾1: Optical modulation device 11: Optical splitter 111, 112: Input end 12: Optical phase modulator 121: First waveguide 122: Second waveguide 123: First electrode 124: Second electrode 125: Bias electrode 13: Optical combiners 131, 132: output terminal 14: proportional regulator 141: first electrode 142: second electrode V1: first modulated voltage V2: second modulated voltage Vb: bias signal Vdc: DC voltage Oin: input Optical signal Oout: output optical signal Om1: first modulated optical signal Om2: second modulated optical signal Os1: first split optical signal Os2: second split optical signal OMA: optical modulation amplitude

1: The first value in the splitting ratio

2: The first value in the binding ratio

: chirp

本發明的其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中：圖1是一平面圖，說明本發明光調變裝置之一第一實施例；圖2是一模擬圖，說明該第一實施例之一輸出光信號的啁啾為不同數值時，一結合比中的第一數值對一分光比中的第一數值的變化；圖3是一模擬圖，說明該第一實施例之該輸出光信號的啁啾為不同數值時，該輸出光信號的一光調製幅度對該分光比中的第一數值的變化；及圖4是一平面圖，說明本發明光調變裝置之一第二實施例。Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a plan view illustrating a first embodiment of an optical modulation device of the present invention; 2 is a simulation diagram illustrating the change of a first numerical value in a combining ratio to a first numerical value in a splitting ratio when the chirps of an output optical signal of the first embodiment are different values; 3 is a simulation diagram illustrating the change of an optical modulation amplitude of the output optical signal to the first value in the splitting ratio when the chirp of the output optical signal is different in the first embodiment; and 4 is a plan view illustrating a second embodiment of a light modulation device of the present invention.

1:光調變裝置1: Light modulation device

11:分光器11: Optical splitter

111、112:輸入端111, 112: input terminal

12:光相位調變器12: Optical Phase Modulator

121:第一波導121: First Waveguide

122:第二波導122: Second waveguide

123:第一電極123: first electrode

124:第二電極124: Second electrode

125:偏壓電極125: Bias electrode

13:光結合器13: Optical combiner

131、132:輸出端131, 132: output terminal

V1:第一調變電壓V1: The first modulation voltage

V2:第二調變電壓V2: The second modulation voltage

Vb:偏壓信號Vb: bias signal

Oin:輸入光信號Oin: input optical signal

Oout:輸出光信號Oout: output optical signal

Om1:第一調變光信號Om1: The first modulated optical signal

Om2:第二調變光信號Om2: The second modulated optical signal

Os1:第一分光信號Os1: The first split optical signal

Os2:第二分光信號Os2: The second split optical signal

ε1:分光比中的第一數值ε1: The first value in the splitting ratio

ε2:結合比中的第一數值ε2: The first value in the binding ratio

Claims

一種光調變裝置，包含：一分光器，用於接收一輸入光信號，並將該輸入光信號以一分光比進行分光，以產生一第一分光信號及一第二分光信號；一光相位調變器，耦接該分光器以接收該等第一及第二分光信號，且將該等第一及第二分光信號進行相位調變，以分別產生一第一調變光信號及一第二調變光信號；及一光結合器，耦接該光相位調變器以接收該等第一及第二調變光信號，並將該等第一及第二調變光信號以一結合比進行結合，以產生一具有一啁啾的輸出光信號，該結合比等於該分光比，該結合比的一比值為正數，且該比值為小於一及大於一之二者其中之一。A light modulation device, comprising: an optical splitter for receiving an input optical signal and splitting the input optical signal with a splitting ratio to generate a first splitting signal and a second splitting signal; an optical phase modulator coupled to the optical splitter to receive the first and second split optical signals, and to perform phase modulation on the first and second split optical signals to generate a first modulated optical signal respectively and a second modulated optical signal; and an optical combiner coupled to the optical phase modulator to receive the first and second modulated optical signals, and combine the first and second modulated optical signals at a combining ratio to generate a The output optical signal has a chirp, the combining ratio is equal to the splitting ratio, a ratio of the combining ratio is a positive number, and the ratio is one of less than one and greater than one.

如請求項1所述的光調變裝置，其中，該光相位調變器包括一第一波導，耦接在該分光器與該光結合器之間，接收來自該分光器的該第一分光信號，並據以產生該第一調變光信號，一第二波導，耦接在該分光器與該光結合器之間，接收來自該分光器的該第二分光信號，並據以產生該第二調變光信號，一第一電極，與該第一波導對應設置，且用於接收一第一調變電壓，該第一調變光信號的相位隨該第一調變電壓的變化而改變，及一第二電極，與該第二波導對應設置，且用於接收一第二調變電壓，該第二調變光信號的相位隨該第二調變電壓的變化而改變。The optical modulation device according to claim 1, wherein the optical phase modulator comprises a first waveguide, coupled between the optical splitter and the optical combiner, receives the first split optical signal from the optical splitter, and generates the first modulated optical signal accordingly, a second waveguide, coupled between the optical splitter and the optical combiner, receives the second split optical signal from the optical splitter, and generates the second modulated optical signal accordingly, a first electrode corresponding to the first waveguide and used for receiving a first modulated voltage, the phase of the first modulated optical signal changes with the change of the first modulated voltage, and A second electrode is disposed corresponding to the second waveguide and is used for receiving a second modulation voltage, and the phase of the second modulation optical signal changes with the change of the second modulation voltage.

如請求項2所述的光調變裝置，其中，該啁啾為一變數，該光相位調變器還包括一偏壓電極，與該第二波導及該第二電極對應設置，且用於接收一偏壓信號，該輸出光信號的該啁啾隨該偏壓信號的變化而改變。The optical modulation device according to claim 2, wherein the chirp is a variable, and the optical phase modulator further comprises: A bias electrode is disposed corresponding to the second waveguide and the second electrode, and is used for receiving a bias signal, and the chirp of the output optical signal changes with the change of the bias signal.

如請求項2所述的光調變裝置，其中，該等第一及第二調變電壓的相位相差180度，該等第一及第二調變電壓的振幅相同。The optical modulation device of claim 2, wherein the phases of the first and second modulation voltages differ by 180 degrees, and the amplitudes of the first and second modulation voltages are the same.

如請求項1所述的光調變裝置，其中，該分光器及該光結合器各自為一Y分支波導。The optical modulation device of claim 1, wherein each of the optical splitter and the optical combiner is a Y-branched waveguide.

如請求項1所述的光調變裝置，其中，該分光器及該光結合器各自為一光定向耦合器。The optical modulation device of claim 1, wherein each of the optical splitter and the optical combiner is an optical directional coupler.

如請求項1所述的光調變裝置，其中，該分光器及該光結合器各自為一多模干涉儀。The optical modulation device of claim 1, wherein each of the optical splitter and the optical combiner is a multimode interferometer.

如請求項1所述的光調變裝置，其中，該分光比與該結合比皆為定值。The light modulation device according to claim 1, wherein the splitting ratio and the combination are both fixed values.

如請求項1所述的光調變裝置，還包含：一比例調整器，用於接收一可變的直流電壓，並根據該直流電壓調整該分光比與該結合比的比例。The light modulation device according to claim 1, further comprising: A proportional adjuster is used for receiving a variable DC voltage and adjusting the ratio of the splitting ratio and the combining ratio according to the DC voltage.

如請求項9所述的光調變裝置，其中，該比例調整器包括一第一電極，與該分光器對應設置，且用於接收該直流電壓，及一第二電極，與該光結合器對應設置，且用於接收該直流電壓。The light modulation device of claim 9, wherein the proportional adjuster comprises a first electrode, disposed corresponding to the optical splitter, and used for receiving the DC voltage, and A second electrode is arranged corresponding to the optical combiner and used for receiving the DC voltage.