JPH09189824A - Wavelength division multiplex transmission device - Google Patents
Wavelength division multiplex transmission deviceInfo
- Publication number
- JPH09189824A JPH09189824A JP8002263A JP226396A JPH09189824A JP H09189824 A JPH09189824 A JP H09189824A JP 8002263 A JP8002263 A JP 8002263A JP 226396 A JP226396 A JP 226396A JP H09189824 A JPH09189824 A JP H09189824A
- Authority
- JP
- Japan
- Prior art keywords
- port
- wavelength
- signal light
- wavelength division
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光通信システムに
使用される波長分割多重伝送装置に関するもので、特に
光増幅器を用いる波長分割多重伝送装置で波長分割され
た各信号光の出力レベルを均一にすることのできる波長
分割多重伝送装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength division multiplex transmission device used in an optical communication system, and more particularly, to uniform output levels of signal lights wavelength-divided by the wavelength division multiplex transmission device using an optical amplifier. The present invention relates to a wavelength division multiplexing transmission device that can be
【０００２】[0002]
【従来の技術】一本の光伝送線路に波長の異なる複数の
信号光を合波して多重波長光を伝送する波長分割多重伝
送方式は、チャネル数の増加により、容易に伝送容量を
増大することが可能な伝送方式であり将来の大容量光通
信システムへの適用が有望視されている。特に、光増幅
器の出現により光増幅器で多重波長光を一括して増幅で
きることから実用化が達成されつつある。多重波長光を
一括増幅できることは、光増幅器の特徴であり、特にED
FA(Erbium Doped Fiber Amplifier)ではチャネル間の干
渉が起こりにくいという特徴を有している。2. Description of the Related Art A wavelength division multiplex transmission system that multiplexes a plurality of signal lights having different wavelengths into one optical transmission line to transmit a multi-wavelength light easily increases the transmission capacity by increasing the number of channels. It is a possible transmission method and is expected to be applied to future large-capacity optical communication systems. In particular, with the advent of optical amplifiers, multi-wavelength light can be collectively amplified by the optical amplifiers, so that practical application is being achieved. The ability to collectively amplify multi-wavelength light is a characteristic of optical amplifiers, and especially ED
FA (Erbium Doped Fiber Amplifier) has the feature that interference between channels is unlikely to occur.
【０００３】[0003]
【発明が解決しようとする課題】ところで、波長分割多
重伝送方式で光増幅器を用いる際の問題点の一つとし
て、光増幅器は増幅特性に波長依存性があるため多重波
長光の波長特性が平坦ではないということがあげられ
る。すなわち、各信号波長によって信号利得が異なるの
で、受信端での光強度が信号波長によって異なってしま
う。By the way, one of the problems in using the optical amplifier in the wavelength division multiplexing transmission system is that the wavelength characteristic of the multiple wavelength light is flat because the amplification characteristic of the optical amplifier depends on the wavelength. It is not. That is, since the signal gain varies depending on each signal wavelength, the light intensity at the receiving end varies depending on the signal wavelength.
【０００４】本発明は上記の課題を解決し、一般的な光
増幅器を用いた波長分割多重伝送方式において信号光波
長による光強度差を補償して各チャネル間の光強度を平
坦化する波長分割多重伝送装置を提供することを目的と
するものである。The present invention solves the above problems, and in a wavelength division multiplex transmission system using a general optical amplifier, a wavelength division for compensating a difference in light intensity due to a signal light wavelength to flatten the light intensity between channels. An object is to provide a multiplex transmission device.
【０００５】[0005]
【課題を解決するための手段】本発明は上記の課題を解
決するために以下のような手段を有している。The present invention has the following means to solve the above problems.
【０００６】本発明のうち請求項１の波長分割多重伝送
装置は、第１、第２、第３のポ−トを備え、第１のポ−
トに入射された光が第２のポ−トから、第２のポ−トに
入射された光が第３のポ−トから、それぞれ出射される
光方向性結合器を有した波長分割多重伝送装置であっ
て、前記光方向性結合器の第１のポ−ト側に光増幅器も
しくは光増幅器に接続された光ファイバ線路が接続され
て前記第１のポ−トに波長多重信号光が入射され、前記
光方向性結合器の第２のポ−ト側に反射波長がそれぞれ
異なる複数のファイバグレ−ティングが接続され、前記
複数のファイバグレ−ティングは前記第３のポ−トから
出射される波長多重信号光の各波長信号光間の出力レベ
ルが所定の範囲に入るように各波長信号光に対して所定
の位置関係と所定の挿入損失と所定の反射率が選択され
て配置されていることを特徴とする。A wavelength division multiplex transmission device according to claim 1 of the present invention comprises a first port, a second port, and a third port.
Wavelength division multiplexing having an optical directional coupler in which the light incident on the second port and the light incident on the second port are emitted from the second port and the third port, respectively. In the transmission device, an optical amplifier or an optical fiber line connected to the optical amplifier is connected to the first port side of the optical directional coupler, and the WDM signal light is supplied to the first port. A plurality of fiber gratings that are made incident and have different reflection wavelengths are connected to the second port side of the optical directional coupler, and the plurality of fiber gratings are emitted from the third port. A predetermined positional relationship, a predetermined insertion loss and a predetermined reflectance are selected and arranged for each wavelength signal light so that the output level between the wavelength signal lights of the wavelength multiplexed signal light falls within a predetermined range. It is characterized by
【０００７】本発明のうち請求項２の波長分割多重伝送
装置は、ファイバグレ−ティングの所定の位置関係とし
て、ファイバグレ−ティングの配置は、第１のポ−トか
ら第２のポ−トに入射された波長多重信号光の入力信号
強度の大きい波長信号光順に方向性結合器から遠い側か
ら方向性結合器に近い側に配置されていることを特徴と
する。In the wavelength division multiplex transmission device according to the second aspect of the present invention, the arrangement of the fiber gratings is changed from the first port to the second port as the predetermined positional relationship of the fiber gratings. It is characterized in that the wavelength-multiplexed signal light incident on is arranged in the order of the wavelength signal light having the highest input signal intensity from the side farther from the directional coupler to the side closer to the directional coupler.
【０００８】本発明のうち請求項３の波長分割多重伝送
装置は、ファイバグレ−ティングの所定の反射率とし
て、第１のポ−トから第２のポ−トに入射された波長多
重信号光の入力信号強度の大きい波長信号光順に波長信
号光に対する反射率の小さいものから反射率の大きいも
のの順にファイバグレ−ティングが対応するように配置
されていることを特徴とする。According to a third aspect of the present invention, in the wavelength division multiplexing transmission apparatus, the wavelength division multiplexed signal light incident from the first port to the second port has a predetermined reflectance of the fiber grating. In the order of the wavelength signal light having the highest input signal strength, the fiber gratings are arranged so as to correspond to the wavelength signal light having a small reflectance to the wavelength signal light having a large reflectance.
【０００９】本発明の請求項１の波長分割多重伝送装置
によれば、第１、第２、第３のポ−トを備え、第１のポ
−トに入射された光が第２のポ−トから、第２のポ−ト
に入射された光が第３のポ−トから、それぞれ出射され
る光方向性結合器を有していて、その光方向性結合器の
第２のポ−トには、反射波長がそれぞれ異なる複数のフ
ァイバグレ−ティングが接続されている。ファイバグレ
−ティングとは、例えばGe添加コア光ファイバに紫外線
を照射してコア部の屈折率を上昇させ、コアの長手方向
で屈折率を周期的に変化させることによって、光ファイ
バ中に回折格子を形成した光ファイバ型部品である。フ
ァイバグレ−ティングはある特定の波長光のみを選択的
に反射し、それ以外の波長光は透過する機能を有してい
る。According to the wavelength division multiplexing transmission device of the first aspect of the present invention, the first, second and third ports are provided, and the light incident on the first port is the second port. From the third port, the light incident from the second port to the second port is emitted from the third port, and the second port of the optical directional coupler is provided. A plurality of fiber gratings having different reflection wavelengths are connected to the optical fiber. Fiber grating is a diffraction grating in an optical fiber, for example, by irradiating a Ge-doped core optical fiber with ultraviolet rays to increase the refractive index of the core portion and periodically changing the refractive index in the longitudinal direction of the core. Is an optical fiber type component formed with. The fiber grating has a function of selectively reflecting only light of a specific wavelength and transmitting light of other wavelengths.
【００１０】ファイバグレ−ティングの特徴としては
挿入損失が低い、光ファイバとの結合性に優れる、
高い反射率が得られる等があげられる。本請求項１の波
長分割多重伝送装置によれば、第２のポ−トに接続され
た反射波長が異なるファイバグレ−ティングの数だけ波
長信号光の波長分割多重伝送が可能となる。第３のポ−
トから出射される波長多重信号光は第２のポ−トに接続
された反射波長が異なるファイバグレ−ティングによっ
て各波長信号光に対して所定の位置関係と所定の挿入損
失と所定の反射率が選択されて各波長信号光間の出力レ
ベルが所定の範囲に入るようになっているので、例え
ば、波長依存性のある増幅特性を有する光増幅器によっ
て増幅された波長多重信号光であっても、第３のポ−ト
から出射される波長多重信号光の各波長信号光のレベル
を均一にすることができるので、受信系での装置設計上
の問題が解決される。The characteristics of fiber grating are low insertion loss, excellent coupling with an optical fiber,
It is possible to obtain high reflectance. According to the wavelength division multiplexing transmission apparatus of the present invention, the wavelength division multiplexing transmission of the wavelength signal light can be performed by the number of fiber gratings connected to the second port and having different reflection wavelengths. Third po
The wavelength-multiplexed signal light emitted from the port is connected to the second port and has a predetermined positional relationship, a predetermined insertion loss and a predetermined reflectance with respect to each wavelength signal light by the fiber grating having different reflection wavelengths. Is selected so that the output level between the respective wavelength signal lights is within a predetermined range, for example, even if the wavelength-multiplexed signal light is amplified by an optical amplifier having a wavelength-dependent amplification characteristic, , The level of each wavelength signal light of the wavelength division multiplexed signal light emitted from the third port can be made uniform, so that the problem in device design in the receiving system can be solved.
【００１１】本発明の請求項２の波長分割多重伝送装置
によれば、ファイバグレ−ティングの所定の位置関係と
して、ファイバグレ−ティングの配置は、第１のポ−ト
から第２のポ−トに入射された波長多重信号光の入力信
号強度の大きい波長信号光順に方向性結合器から遠い側
から方向性結合器に近い側に配置されている。通常、各
ファイバグレ−ティングに対して波長信号光の挿入損失
値はさほど差が無い。したがって必然的に方向性結合器
から遠いファイバググレ−ティングの中心波長の信号ほ
ど、最終的な信号光強度が減少する。そこで入力信号強
度の大きい順に、方向性結合器から遠い側から方向性結
合器に近い側に配置することによって、第３のポ−トか
ら出射される波長多重信号光の各波長信号光の波長平坦
性を得ることができる。According to the wavelength division multiplexing transmission apparatus of the second aspect of the present invention, as the predetermined positional relationship of the fiber grating, the arrangement of the fiber grating is changed from the first port to the second port. The wavelength-multiplexed signal light incident on the optical fiber is arranged in the order of the wavelength signal light having the highest input signal strength from the side farther from the directional coupler to the side closer to the directional coupler. Usually, there is not much difference in the insertion loss value of the wavelength signal light with respect to each fiber grating. Therefore, the signal intensity of the central wavelength of the fiber grating which is farther from the directional coupler inevitably decreases the final signal light intensity. Therefore, by arranging from the side distant from the directional coupler to the side closer to the directional coupler in order of increasing input signal strength, the wavelength of each wavelength signal light of the wavelength division multiplexed signal light emitted from the third port is increased. Flatness can be obtained.
【００１２】本発明の請求項３の波長分割多重伝送装置
によれば、ファイバグレ−ティングの所定の反射率とし
て、第１のポ−トから第２のポ−トに入射された波長多
重信号光の入力信号強度の大きい波長信号光順に波長信
号光に対する反射率の小さいものから反射率の大きいも
のの順にファイバグレ−ティングが対応するように配置
されるので、入力信号強度の大きい波長信号光とその波
長信号光に対する反射率の小さいものが組み合わされ、
第３のポ−トから出射される波長多重信号光の各波長信
号光の波長平坦性を得ることができる。According to the wavelength division multiplex transmission device of the third aspect of the present invention, the wavelength multiplex signal incident from the first port to the second port has a predetermined reflectance of the fiber grating. Since the fiber gratings are arranged so as to correspond in the order of the reflectance of the wavelength signal light to the wavelength signal light with the highest input signal strength of the light to the reflectance of the wavelength signal light with the highest reflectance, Those with a small reflectance for the wavelength signal light are combined,
The wavelength flatness of each wavelength signal light of the wavelength division multiplexed signal light emitted from the third port can be obtained.
【００１３】[0013]
【発明の実施の形態】以下に本発明を実施の形態により
詳細に説明する。図１は、本発明の波長分割多重伝送装
置を示す構成図である。図１に示す波長分割多重伝送装
置１は第１のポ−ト２、第２のポ−ト３、第３のポ−ト
４を備えた光方向性結合器５を有している。波長分割多
重伝送装置１の光方向性結合器５は第１のポ−ト２に入
射された光が第２のポ−ト３から、第２のポ−ト３に入
射された光が第３のポ−ト４から、それぞれ出射され
る。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to embodiments. FIG. 1 is a block diagram showing a wavelength division multiplexing transmission apparatus of the present invention. The wavelength division multiplexing transmission device 1 shown in FIG. 1 has an optical directional coupler 5 having a first port 2, a second port 3 and a third port 4. In the optical directional coupler 5 of the wavelength division multiplexing transmission device 1, the light incident on the first port 2 is the light incident on the second port 3 and the light incident on the second port 3 is the first light. The light is emitted from the respective ports 4 of 3.
【００１４】光方向性結合器５の第１のポ−ト２に光増
幅器６に接続された光ファイバ線路７が接続されてい
る。光方向性結合器５の第２のポ−ト３に反射波長がそ
れぞれ異なる、複数のファイバグレ−ティング８ａ、８
ｂ、、８ｎが光ファイバ線路９に所定の順序で配置され
ている。本実施の形態においては４個のファイバグレ−
ティング８ａ、８ｂ、８ｃ、８ｄが接続されている。第
２のポ−ト３に接続された光ファイバ線路９の端末は無
反射処理が施された無反射処理端９ａとなっている。光
方向性結合器５の第３のポ−ト４は光ファイバ線路１０
を介して、受信系に接続されている。上記のように構成
された波長分割多重伝送装置１について具体的事例につ
いて以下に説明する。An optical fiber line 7 connected to an optical amplifier 6 is connected to the first port 2 of the optical directional coupler 5. A plurality of fiber gratings 8a, 8 having different reflection wavelengths on the second port 3 of the optical directional coupler 5, respectively.
b, 8n are arranged in the optical fiber line 9 in a predetermined order. In this embodiment, four fiber gray
The tongues 8a, 8b, 8c and 8d are connected. The end of the optical fiber line 9 connected to the second port 3 is an antireflection treated end 9a which is antireflection treated. The third port 4 of the optical directional coupler 5 is an optical fiber line 10
Is connected to the receiving system via. A specific example of the wavelength division multiplexing transmission device 1 configured as described above will be described below.
【００１５】[0015]
（実施例１）上記のように構成された波長分割多重伝送
装置１の光増幅器６に波長多重信号光として４つの波長
信号光1546nm、1550nm、1554nmおよび1558nmが全て−２
０ｄＢm で入力され、その増幅後の出力特性が表１に示
すようにＯ．６９ｄＢの強度差を有して、方向性結合器
５に入力された。方向性結合器５の第２のポ−ト３に配
置された図２に示すファイバグレ−ティング８ａ、８
ｂ、８ｃ、８ｄはそれぞれの中心波長以外での挿入損失
を表２に示すように、入力レベルの大きい波長信号光か
ら入力レベルの小さい波長信号光の順に、光方向性結合
器５から遠い側から光方向性結合器５に近い側に配置す
るように設定した。(Embodiment 1) Four wavelength signal lights 1546 nm, 1550 nm, 1554 nm and 1558 nm are all -2 as wavelength division multiplexed signal light in the optical amplifier 6 of the wavelength division multiplexing transmission apparatus 1 configured as described above.
0 dBm is input, and the output characteristics after amplification are O.S. It was input to the directional coupler 5 with an intensity difference of 69 dB. The fiber gratings 8a, 8 shown in FIG. 2 arranged in the second port 3 of the directional coupler 5.
As shown in Table 2, b, 8c, and 8d show the insertion loss at wavelengths other than the central wavelengths, in the order of the wavelength signal light having a higher input level to the wavelength signal light having a lower input level, which is farther from the optical directional coupler 5. It was set so as to be arranged on the side close to the optical directional coupler 5.
【００１６】また、入力レベルの大きい波長信号光から
入力レベルの小さい波長信号光の順に対応するように、
中心波長の挿入損失の大きいものから中心波長の挿入損
失の小さいものの順にファイバグレ−ティング８ａ、８
ｂ、８ｃ、８ｄを配置するように設定した。なお、それ
ぞれの中心波長以外の挿入損失は全て0.15dBのものを用
いた。Further, in order from the wavelength signal light having a large input level to the wavelength signal light having a small input level,
Fiber gratings 8a, 8 in order of increasing insertion loss at the center wavelength to decreasing insertion loss at the center wavelength
It was set to arrange b, 8c, and 8d. Note that the insertion loss was 0.15 dB except for the center wavelength.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 上記のように設定したことにより第２のポ−ト３から第
３のポ−ト４に入力された４つの波長信号光1546nm、15
50nm、1554nmおよび1558nmの出力強度は表３のようにな
った。[Table 2] With the above settings, the four wavelength signal lights 1546 nm, 15 input from the second port 3 to the third port 4 are input.
The output intensities at 50 nm, 1554 nm and 1558 nm are shown in Table 3.
【００１９】[0019]
【表３】 すなわち、Ｏ．６９ｄＢの強度差を有していたものが
Ｏ．２９ｄＢの強度差になり、出力の波長平坦性が得ら
れた。[Table 3] That is, O. What had a difference in intensity of 69 dB was O.V. The intensity difference was 29 dB, and output wavelength flatness was obtained.
【００２０】（実施例２）実施例１と同様に波長分割多
重伝送装置１の光増幅器６に波長多重信号光として４つ
の波長信号光1546nm、1550nm、1554nmおよび1558nmが全
て−２０ｄＢｍで入力され、その増幅後の出力特性が表
１に示すようにＯ．６９ｄＢの強度差を有して、方向性
結合器５に入力された。方向性結合器５の第２のポ−ト
３に配置された図３に示すファイバグレ−ティング８
ａ、８ｂ、８ｃ、８ｄはそれぞれの中心波長の反射率お
よびそれぞれの中心波長以外の挿入損失を表４に示すよ
うに設定した。すなわち、入力レベルの大きい波長信号
光から入力レベルの小さい波長信号光の順に、反射率の
小さいものから反射率の大きいもの順が対応するに設定
した。なお、図４は中心波長が１５５０nm帯で反射する
ファイバグレ−ティングの一例を示す説明図である。(Embodiment 2) As in Embodiment 1, the four wavelength signal lights 1546 nm, 1550 nm, 1554 nm and 1558 nm are all inputted to the optical amplifier 6 of the wavelength division multiplexing transmission apparatus 1 at -20 dBm as wavelength multiplexed signal lights. As shown in Table 1, the output characteristic after the amplification is 0. It was input to the directional coupler 5 with an intensity difference of 69 dB. The fiber grating 8 shown in FIG. 3 arranged in the second port 3 of the directional coupler 5.
For a, 8b, 8c and 8d, the reflectance at each center wavelength and the insertion loss other than each center wavelength were set as shown in Table 4. That is, the wavelength signal light having a high input level to the wavelength signal light having a low input level is set to correspond in the order of the reflectance from the smallest to the largest. Note that FIG. 4 is an explanatory diagram showing an example of fiber grating in which the central wavelength is reflected in the 1550 nm band.
【００２１】また、入力レベルの大きい波長信号光から
入力レベルの小さい波長信号光の順に、中心波長の挿入
損失の大きいものから中心波長の挿入損失の小さいもの
の順に対応するようにファイバグレ−ティング８ａ、８
ｂ、８ｃ、８ｄを配置するように設定した。なお、それ
ぞれの中心波長以外での挿入損失は全て0.15dBのものを
用いた。Further, the fiber grating 8a is arranged so as to correspond in order from the wavelength signal light having a large input level to the wavelength signal light having a small input level in the order of the insertion loss of the central wavelength to the insertion loss of the central wavelength. , 8
It was set to arrange b, 8c, and 8d. The insertion loss was 0.15 dB except for the center wavelength.
【００２２】[0022]
【表４】 上記のように設定したことにより第２のポ−ト３から第
３のポ−ト４に入力された４つの波長信号光1546nm、15
50nm、1554nmおよび1558nmの信号出力強度は表５のよう
になった。[Table 4] With the above settings, the four wavelength signal lights 1546 nm, 15 input from the second port 3 to the third port 4 are input.
The signal output intensities at 50 nm, 1554 nm and 1558 nm are shown in Table 5.
【００２３】[0023]
【表５】 すなわち、Ｏ．６９ｄＢの強度差を有していたものが出
力の波長平坦性が得られた。[Table 5] That is, O. The wavelength flatness of the output was obtained when the intensity difference was 69 dB.
【００２４】[0024]
【発明の効果】以上述べたように、本発明の請求項１の
波長分割多重伝送装置によれば、第３のポ−トに出射さ
れる波長多重信号光は第２のポ−トに接続された反射波
長がそれぞれ異なるファイバグレ−ティングによって各
波長信号光に対して所定の位置関係と所定の挿入損失と
所定の反射率が選択されて各波長信号光間の出力レベル
が所定の範囲に入るようになっているので、例えば、波
長依存性のある光増幅器によって増幅された波長多重信
号光であっても、第３のポ−トに出射される波長多重信
号光の各波長信号光のレベルを均一にすることができる
ので、受信系での装置設計上の問題が解決された。As described above, according to the wavelength division multiplexing transmission device of the first aspect of the present invention, the wavelength division multiplexed signal light emitted to the third port is connected to the second port. The specified positional relationship, specified insertion loss and specified reflectance for each wavelength signal light are selected by fiber grating with different reflected wavelengths so that the output level between each wavelength signal light falls within the specified range. Therefore, for example, even if the wavelength-multiplexed signal light amplified by the optical amplifier having the wavelength dependence, the wavelength-multiplexed signal light of the wavelength-multiplexed signal light emitted to the third port is Since the level can be made uniform, the problem of device design in the receiving system was solved.
【００２５】本発明の請求項２の波長分割多重伝送装置
によれば、第２のポ−トに接続されたファイバグレ−テ
ィングが入力信号強度の大きい順に、方向性結合器から
遠い側から近い側に配置された結果、第３のポ−トに出
射される波長多重信号光の各波長信号光は波長平坦性が
得られた。According to the wavelength division multiplexing transmission apparatus of the second aspect of the present invention, the fiber grating connected to the second port is closer to the distant side from the directional coupler in the descending order of the input signal strength. As a result of being disposed on the side, wavelength flatness was obtained for each wavelength signal light of the wavelength division multiplexed signal light emitted to the third port.
【００２６】本発明の請求項３の波長分割多重伝送装置
によれば、ファイバグレ−ティングの所定の反射率とし
て、第１のポ−トから第２のポ−トに入射された波長多
重信号光の入力信号強度の大きい波長信号光順に波長信
号光に対する反射率の小さいものから反射率の大きいも
のの順にファイバグレ−ティングが対応するように配置
されるので、入力信号強度の大きい波長信号光とその波
長信号光に対する反射率の小さいものが組み合わされ、
第３のポ−トに出射される波長多重信号光の各波長信号
光の波長平坦性を得ることができた。According to the wavelength division multiplex transmission device of the third aspect of the present invention, the wavelength multiplex signal incident from the first port to the second port has a predetermined reflectance of the fiber grating. Since the fiber gratings are arranged so as to correspond in the order of the reflectance of the wavelength signal light to the wavelength signal light with the highest input signal strength of the light to the reflectance of the wavelength signal light with the highest reflectance, Those with a small reflectance for the wavelength signal light are combined,
The wavelength flatness of each wavelength signal light of the wavelength multiplexed signal light emitted to the third port could be obtained.
【図１】本発明の波長分割多重伝送装置の一実施の形態
を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of a wavelength division multiplexing transmission apparatus of the present invention.
【図２】図１の波長分割多重伝送装置の主要部の一例を
示す構成図である。FIG. 2 is a configuration diagram showing an example of a main part of the wavelength division multiplexing transmission device of FIG.
【図３】図１の波長分割多重伝送装置の主要部の他の一
例を示す構成図である。3 is a configuration diagram showing another example of a main part of the wavelength division multiplexing transmission device of FIG.
【図４】図１の波長分割多重伝送装置に使用されるファ
イバグレ−ティングの典型的な反射特性を示す説明図で
ある。4 is an explanatory diagram showing typical reflection characteristics of fiber grating used in the wavelength division multiplexing transmission device of FIG. 1. FIG.
１ 波長分割多重伝送装置 ２ 第１のポ−ト ３ 第２のポ−ト ４ 第３のポ−ト ５ 光方向性結合器 ６ 光増幅器 ７ 光ファイバ線路 ８ａ ファイバグレ−ティング ８ｂ ファイバグレ−ティング ８ｃ ファイバグレ−ティング ８ｄ ファイバグレ−ティング ９ 光ファイバ線路 ９ａ 無反射端 DESCRIPTION OF SYMBOLS 1 Wavelength division multiplexing transmission apparatus 2 1st port 3 2nd port 4 3rd port 5 Optical directional coupler 6 Optical amplifier 7 Optical fiber line 8a Fiber grating 8b Fiber grating 8c Fiber grating 8d Fiber grating 9 Optical fiber line 9a Non-reflective end
Claims (3)
のポ−トに入射された光が第２のポ−トから、第２のポ
−トに入射された光が第３のポ−トから、それぞれ出射
される光方向性結合器を有した波長分割多重伝送装置で
あって、前記光方向性結合器の第１のポ−ト側に光増幅
器もしくは光増幅器に接続された光ファイバ線路が接続
されて前記第１のポ−トに波長多重信号光が入射され、
前記光方向性結合器の第２のポ−ト側に反射波長がそれ
ぞれ異なる複数のファイバグレ−ティングが接続され、
前記複数のファイバグレ−ティングは前記第３のポ−ト
から出射される波長多重信号光の各波長信号光間の出力
レベルが所定の範囲に入るように各波長信号光に対して
所定の位置関係と所定の挿入損失と所定の反射率が選択
されて配置されていることを特徴とする波長分割多重伝
送装置。1. A first, a second, and a third port are provided, and the first
The light having a directional coupler in which the light incident on the second port and the light incident on the second port are emitted from the second port and the third port, respectively. A wavelength division multiplex transmission device, wherein an optical amplifier or an optical fiber line connected to an optical amplifier is connected to the first port side of the optical directional coupler, and the wavelength division multiplexing is provided to the first port. Signal light is incident,
A plurality of fiber gratings having different reflection wavelengths are connected to the second port side of the optical directional coupler,
The plurality of fiber gratings have predetermined positions with respect to the respective wavelength signal lights so that the output level between the wavelength signal lights of the wavelength multiplexed signal light emitted from the third port falls within a predetermined range. A wavelength division multiplexing transmission device characterized in that a relationship, a predetermined insertion loss and a predetermined reflectance are selected and arranged.
係として、ファイバグレ−ティングの配置は、第１のポ
−トから第２のポ−トに入射された波長多重信号光の入
力信号強度の大きい波長信号光順に方向性結合器から遠
い側から近い側に配置されていることを特徴とする請求
項１に記載の波長分割多重伝送装置。2. As a predetermined positional relationship of the fiber grating, the arrangement of the fiber grating is such that the input signal intensity of the wavelength division multiplexed signal light incident from the first port to the second port is changed. The wavelength division multiplexing transmission device according to claim 1, wherein the wavelength division multiplexing transmission devices are arranged in the order of larger wavelength signal light from the side farther from the directional coupler to the side closer thereto.
として、第１のポ−トから第２のポ−トに入射された波
長多重信号光の入力信号強度の大きい波長信号光順に波
長信号光に対する反射率の小さいものから反射率の大き
いものの順にファイバグレ−ティングが対応するように
配置されていることを特徴とする請求項１に記載の波長
分割多重伝送装置。3. A wavelength signal light in order of wavelength signal light having a large input signal intensity of the wavelength multiplexed signal light incident from the first port to the second port as the predetermined reflectance of the fiber grating. 2. The wavelength division multiplexing transmission device according to claim 1, wherein the fiber gratings are arranged so that the fiber gratings are arranged in order from the one having a smaller reflectance to the one having a larger reflectance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8002263A JPH09189824A (en) | 1996-01-10 | 1996-01-10 | Wavelength division multiplex transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8002263A JPH09189824A (en) | 1996-01-10 | 1996-01-10 | Wavelength division multiplex transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09189824A true JPH09189824A (en) | 1997-07-22 |
Family
ID=11524492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8002263A Pending JPH09189824A (en) | 1996-01-10 | 1996-01-10 | Wavelength division multiplex transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09189824A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222962B1 (en) | 1997-11-14 | 2001-04-24 | Samsung Electronics Co., Ltd. | Optical amplifier |
| US6462844B1 (en) | 1998-03-19 | 2002-10-08 | Fujitsu Limited | Wavelength-division multiplexing transmission system, a method for designing a loss difference compensator for optical devices used in the wavelength-division multiplexing transmission system, and a method for configuring the wavelength-division multiplexing transmission system |
| WO2020213466A1 (en) * | 2019-04-17 | 2020-10-22 | 長野計器株式会社 | Physical quantity measurement device |
-
1996
- 1996-01-10 JP JP8002263A patent/JPH09189824A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222962B1 (en) | 1997-11-14 | 2001-04-24 | Samsung Electronics Co., Ltd. | Optical amplifier |
| US6462844B1 (en) | 1998-03-19 | 2002-10-08 | Fujitsu Limited | Wavelength-division multiplexing transmission system, a method for designing a loss difference compensator for optical devices used in the wavelength-division multiplexing transmission system, and a method for configuring the wavelength-division multiplexing transmission system |
| WO2020213466A1 (en) * | 2019-04-17 | 2020-10-22 | 長野計器株式会社 | Physical quantity measurement device |
| JP2020176884A (en) * | 2019-04-17 | 2020-10-29 | 長野計器株式会社 | Physical quantity measuring device |
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