JP2003065894A - Optical fiber pair identification method and device - Google Patents
Optical fiber pair identification method and deviceInfo
- Publication number
- JP2003065894A JP2003065894A JP2001257899A JP2001257899A JP2003065894A JP 2003065894 A JP2003065894 A JP 2003065894A JP 2001257899 A JP2001257899 A JP 2001257899A JP 2001257899 A JP2001257899 A JP 2001257899A JP 2003065894 A JP2003065894 A JP 2003065894A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- light
- subscriber terminal
- reference light
- core
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光ファイバ心線対
照方法及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for checking an optical fiber cable.
【０００２】[0002]
【従来の技術】近年、シングルモード光ファイバを用
い、波長1.31μｍ帯及び1.55μｍ帯の通信光による波長
多重方式を用いたサービスの導入が拡大されている。そ
のサービスを提供するために使用している光ファイバに
故障修理や回線切替が発生した場合、即応性を確保する
上で、運用中の回線についてサービスに影響を与えず、
光回線の心線対照が行える方法が必要となる。2. Description of the Related Art In recent years, introduction of services using a wavelength division multiplexing system using communication light of wavelengths 1.31 μm band and 1.55 μm band using a single mode optical fiber has been expanded. In the event of failure repair or line switching in the optical fiber used to provide that service, in order to ensure prompt response, the service of the operating line will not be affected,
It is necessary to have a method that can compare the optical fiber cores.
【０００３】図３は、運用中回線として使用している光
ファイバ３，３，３，…（ただし図示は対照試験対象の
１本のみ）の心線対照を実施するための光線路構成の概
略図である。運用中回線として使用している光ファイバ
３の心線対照を実施しようとした場合、対照すべき光フ
ァイバ３に、局内装置１を有する通信設備ビル側から、
心線対照器光源部９によって発生した、通信光１３と異
なった波長1.615μｍ〜1.675μｍの範囲の心線対照光１
４を光カプラ２を介して入射する。一方、作業現場にお
いては、心線対照器曲げ部１０により、光ファイバ３に
曲げ半径12.5〜13.0ｍｍの曲げ３ａを加える。そして、
その曲げ３ａによる心線対照光の放射光１１を心線対照
器曲げ部１０に付属する所定の受光素子からなる受信機
１２で検知する。これらの構成によって心線対照が行わ
れている。FIG. 3 is a schematic diagram of an optical line configuration for carrying out core line comparison of the optical fibers 3, 3, 3, ... (However, only one of the comparison test objects is shown in the figure) used as an operating line. It is a figure. When attempting to compare the cores of the optical fiber 3 used as the operating line, from the side of the communication facility building having the intra-station device 1 to the optical fiber 3 to be compared,
Core line contrast light 1 generated by the core line contrast light source unit 9 and having a wavelength range of 1.615 μm to 1.675 μm different from the communication light 13
4 is incident through the optical coupler 2. On the other hand, at the work site, the optical fiber 3 is bent by the bending section 10 of the optical fiber contrast device to bend 3a having a bending radius of 12.5 to 13.0 mm. And
The radiated light 11 of the core line contrast light due to the bend 3a is detected by the receiver 12 including a predetermined light receiving element attached to the core line contrast bender 10. The core control is performed by these configurations.
【０００４】上記曲げ半径は、曲げによる伝送品質の劣
化を最小にし、且つ心線対照装置が心線対照光を検知可
能とする条件を同時に満足するために定められている。
この方法は、山本他、特開平06-221958号公報「光ファ
イバ心線対照装置」で既知である。該方法では、前述の
とおり心線対照光波長が通信光波長と異なるように波長
配置されている。The bending radius is set so as to minimize the deterioration of transmission quality due to bending and simultaneously satisfy the conditions under which the optical fiber comparison apparatus can detect optical fiber contrast light.
This method is known from Yamamoto et al., “Optical fiber core wire comparison device” in Japanese Patent Laid-Open No. 06-221958. In this method, as described above, the wavelengths of the optical fibers for controlling the optical fiber are arranged so that they are different from the wavelength of the communication light.
【０００５】更に、加入者端末７の入力部に透過特性に
関し、波長依存性を有する心線対照光遮断型光フィルタ
８を挿入することにより、たとえ運用中回線に心線対照
光を入射してもサービス品質を劣化させることなく運用
中回線の心線対照が実現されている。この場合、加入者
端末７は、光ファイバ３を介して光信号を受信して電気
信号に変換する光受信機４と、通信光１３の変調周波数
に対応する帯域透過特性を有する帯域フィルタ５と、帯
域フィルタ５から出力された電気信号を受信して復調す
る受信機６とから構成されている。Further, by inserting the optical fiber 8 for blocking the optical fiber for controlling the transmission characteristic into the input section of the subscriber terminal 7, the optical fiber 8 for controlling the optical transmission of the optical fiber is inserted even in the operating line. The core line contrast of the operating line has been realized without degrading the service quality. In this case, the subscriber terminal 7 includes an optical receiver 4 that receives an optical signal via the optical fiber 3 and converts the optical signal into an electric signal, and a bandpass filter 5 having a band transmission characteristic corresponding to the modulation frequency of the communication light 13. , A receiver 6 that receives and demodulates the electric signal output from the bandpass filter 5.
【０００６】[0006]
【発明が解決しようとする課題】現在の心線対照方法に
おいては、心線対照光遮断型光フィルタ８が対照すべき
光ファイバ３に設置されていない場合、心線対照光１４
と通信光１３は同時に加入者端末７に内蔵された光受信
機４で受光される。心線対照光１４は通信光１３と共に
電気信号に変換される。図４に変換後の受信信号スペク
トルの模式図を示す。本図が示すように、たとえ心線対
照光１４が通信光１３とは異なる波長を有していても通
信信号と心線対照信号の重畳が生じ、この重畳周波数成
分が雑音となり通信に影響を与えてしまう。このことを
詳細に説明すると次のようになる。In the present method of observing the optical fiber, the optical fiber for observing the optical fiber 14 is not provided when the optical fiber 8 for shielding optical fiber is not installed in the optical fiber 3 to be controlled.
And the communication light 13 are simultaneously received by the optical receiver 4 built in the subscriber terminal 7. The core wire reference light 14 is converted into an electric signal together with the communication light 13. FIG. 4 shows a schematic diagram of the received signal spectrum after conversion. As shown in the figure, even if the optical fiber contrast light 14 has a wavelength different from that of the communication light 13, the communication signal and the optical fiber contrast signal are superposed, and the superposed frequency component becomes noise and affects communication. Will give. This will be described in detail below.
【０００７】心線対照光１４が通信光１３と比較して十
分に低速で、且つパルス変調されていると仮定する。こ
の時、心線対照光１４が加入者端末７に入射された場合
の符号誤り率（BER）は以下の式で与えられる。It is assumed that the optical fiber reference light 14 is sufficiently slower than the communication light 13 and is pulse-modulated. At this time, the code error rate (BER) when the optical fiber reference light 14 is incident on the subscriber terminal 7 is given by the following equation.
【数１】
ここで、SDは通信光１３の等価入力信号電流、σ0 2は通
信光１３のみが加入者端末７に入射されているときの加
入者端末７での等価入力雑音電流の全分散、SIDは心線
対照光１４の等価入カピーク電流、σ1 2は通信光１３と
心線対照光１４が同時に加入者端末７に入射されている
時の加入者端末７での等価入力雑音電流、erfc（x）は
補誤差関数であり、[Equation 1] Here, S D is the equivalent input signal current of the communication light 13, σ 0 2 is the total dispersion of the equivalent input noise current at the subscriber terminal 7 when only the communication light 13 is incident on the subscriber terminal 7, S 0 ID is the equivalent input peak current of the optical fiber reference light 14, σ 1 2 is the equivalent input noise current at the subscriber terminal 7 when the communication light 13 and the optical fiber reference light 14 are simultaneously incident on the subscriber terminal 7, erfc (x) is the complementary error function,
【数２】 で定義される。[Equation 2] Is defined by
【０００８】また、通信光１３の受光平均パワをPS、心
線対照光１４の平均受光パワをPID、加入者端末７まで
の通信光１３の変換効率をρS、心線対照光１４の変換
効率をρIDとすると、通信光１３と心線対照光１４の等
価入力電流はそれぞれ、Further, the average received light power of the communication light 13 is P S , the average received light power of the core line reference light 14 is P ID , the conversion efficiency of the communication light 13 to the subscriber terminal 7 is ρ S , the core line reference light 14 Assuming that the conversion efficiency of is ρ ID , the equivalent input currents of the communication light 13 and the optical fiber contrast light 14 are, respectively,
【数３】 で与えられる。[Equation 3] Given in.
【０００９】式（１）を用いて、心線対照光１４の受光
パワに依存したBER劣化を見積った結果を図５において
点線で示す。ここでは、等価入力雑音電流の全分散に関
し、心線対照光による増加分をショット雑音のみと仮定
した。参考文献（ITU-T. Recommendation G.983.1,“Br
oadband optical access systems based on Passive Op
tical Networks（PON）,”1988）に従い、SD 2/σ0 2＝22
dB、PS＝−33dBmとした。BER＜10-9を満足しようとした
場合、心線対照光１４の平均受光パワPIDは−51dBm以下
とする必要があることが分かる。例えば加入者端末７の
入力部において心線対照光平均受光パワが−35dBmの場
合、運用中回線の心線対照を実現するため、１６ｄＢ以
上の遮断量を有する心線対照光遮断型光フィルタ８を挿
入する必要がある。The result of estimating the BER deterioration depending on the light receiving power of the core wire reference light 14 using the equation (1) is shown by a dotted line in FIG. Here, regarding the total dispersion of the equivalent input noise current, it is assumed that the increase due to the optical fiber reference light is only shot noise. References (ITU-T. Recommendation G.983.1, “Br
oadband optical access systems based on Passive Op
S D 2 / σ 0 2 = 22 according to tical networks (PON), “1988)
dB and P S = −33 dBm. When trying to satisfy BER <10 −9 , it is understood that the average received power P ID of the core line reference light 14 needs to be −51 dBm or less. For example, in the case where the average power of the optical fiber for contrasting optical fiber at the input part of the subscriber terminal 7 is -35 dBm, the optical fiber 8 for controlling optical fiber for optical fiber 8 having a blocking amount of 16 dB or more is provided in order to realize the optical fiber contrasting of the operating line. Need to be inserted.
【００１０】しかし、心線対照光遮断型光フィルタ８の
挿入は、光フィルタ固有の損失により、光線路全体の線
路損失が増加し、光通信方式の適用距離を制限してしま
うという欠点を有している。また、光フィルタの設置に
より、光通信システムで使用する光線路全体の高コスト
化に繋がるという問題があった。However, the insertion of the optical filter 8 for blocking the optical fiber against the optical fiber has the drawback that the line loss of the entire optical line increases due to the loss peculiar to the optical filter and the applicable distance of the optical communication system is limited. is doing. Further, there is a problem that the installation of the optical filter leads to an increase in the cost of the entire optical line used in the optical communication system.
【００１１】そこで本発明には、上記の事情を考慮し、
従来に比べ低コストで、また光通信方式の適用距離の制
限を改善することができる光ファイバ心線対照方法及び
装置を提供することを目的とする。Therefore, in the present invention, considering the above circumstances,
It is an object of the present invention to provide an optical fiber core wire comparison method and device which are less costly than conventional ones and which can improve the limitation of the applicable distance of the optical communication system.
【００１２】[0012]
【課題を解決するための手段】上記課題を解決するた
め、請求項１記載の発明は、局内装置と加入者端末との
間に設けられた光ファイバの心線対照を行うための心線
対照方法において、局内装置側から被試験対象の光ファ
イバに対して心線対照光を入力する際に、心線対照光の
変調周波数を、局内装置と加入者端末間の通信信号の変
調周波数に対して、その帯域外で、かつ加入者端末に予
め内蔵されている帯域フィルタによって心線対照光の変
調周波数のみが遮断されるように周波数配置することを
特徴とする。請求項２記載の発明は、前記心線対照光を
受信する際に、心線対照光の変調周波数成分のみを透過
する所定の帯域フィルタを用いて心線対照光に対応する
信号を復調することを特徴とする。In order to solve the above-mentioned problems, the invention according to claim 1 is a core wire comparison for performing a core wire comparison of an optical fiber provided between an in-office device and a subscriber terminal. In the method, when the optical fiber to be tested is input from the in-station device side to the optical fiber under test, the modulation frequency of the optical fiber is compared with the modulation frequency of the communication signal between the in-station device and the subscriber terminal. Then, the frequency is arranged outside the band and so that only the modulation frequency of the optical fiber reference light is cut off by a band filter built in the subscriber terminal in advance. According to a second aspect of the present invention, when receiving the optical fiber reference light, a signal corresponding to the optical fiber reference light is demodulated using a predetermined bandpass filter that transmits only the modulation frequency component of the optical fiber reference light. Is characterized by.
【００１３】請求項３記載の発明は、局内装置と加入者
端末との間に設けられた光ファイバの心線対照を行うた
めの心線対照装置において、局内装置と加入者端末間の
通信信号の変調周波数の帯域外であって、かつ加入者端
末に予め内蔵されている帯域フィルタによって遮断され
る周波数帯域内に、変調周波数を有する心線対照光を発
生する心線対照光発生手段と、心線対照光発生手段によ
って発生された心線対照光を被試験対象の光ファイバに
入射する光カプラと、その光ファイバを介して送られて
くる心線対照光を受信する心線対照光受信手段とを備え
ることを特徴とする。請求項４記載の発明は、前記心線
対照光受信手段が、心線対照光の変調周波数成分のみを
透過する所定の帯域フィルタを有していることを特徴と
する。According to a third aspect of the present invention, there is provided a core line checking device for performing a core line check of an optical fiber provided between an intra-station device and a subscriber terminal, wherein a communication signal between the intra-station device and the subscriber terminal is provided. A core wire reference light generation means for generating a core wire reference light having a modulation frequency in a frequency band outside the band of the modulation frequency of and which is cut off by a band filter built in the subscriber terminal in advance, An optical coupler for injecting the optical fiber reference light generated by the optical fiber reference light generation means into an optical fiber to be tested, and an optical fiber reference light reception for receiving the optical fiber reference light sent through the optical fiber. And means. The invention according to claim 4 is characterized in that the optical fiber reference light receiving means has a predetermined bandpass filter which transmits only the modulation frequency component of the optical fiber reference light.
【００１４】[0014]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態について説明する。図１は、本発明による心線
対照を実施するための光線路構成の概略図である。図２
は、図１に示す帯域フィルタ１９の透過帯域と、心線対
照光源部１７の変調周波数との配置を示す図である。な
お、図１では、図３に示すものと同一の構成には同一の
符号を付けている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of an optical line configuration for carrying out the optical fiber contrast according to the present invention. Figure 2
FIG. 3 is a diagram showing an arrangement of a transmission band of the bandpass filter 19 shown in FIG. 1 and a modulation frequency of the core wire reference light source unit 17. In FIG. 1, the same components as those shown in FIG. 3 are designated by the same reference numerals.
【００１５】図１において、信号発生器１６により通信
信号対域外の周波数ｆｃに周波数変調された心線対照光
１５が、心線対照器光源部１７より光カプラ２を介して
対照すべき光ファイバ３に入射される。作業現場で心線
対照器曲げ部２１により光ファイバ３に曲げ３ａを加え
ることにより、光ファイバ３中の光が放射される。放射
光１１は心線対照器曲げ部２に付属する受光部１８にて
受信され、電気信号に変換される。本実施形態では、心
線対照器曲げ部２１に心線対照光１５の変調周波数成分
（周波数ｆｃ）を透過帯域とする帯域フィルタ１９を具
備することにより、たとえ心線対照光１５と通信光１３
が同時に放射されても、心線対照光１５の変調周波数成
分のみが、心線対照器曲げ部２１の受信機２０で受信可
能となる。これにより、作業現場にて光ファイバケーブ
ル２２に収容されている多くの運用中の光ファイバ３，
３，３，…から、対照すべき光ファイバ３の心線対照が
可能となる。In FIG. 1, the optical fiber to be compared with the optical fiber 15 which is frequency-modulated by the signal generator 16 to a frequency fc outside the communication signal range, is to be compared from the optical fiber source 17 of the optical fiber via the optical coupler 2. It is incident on 3. By bending the optical fiber 3 by the bending portion 21 at the work site, the light in the optical fiber 3 is radiated. The radiated light 11 is received by the light receiving unit 18 attached to the core wire bending unit 2 and converted into an electric signal. In the present embodiment, by providing the band-pass filter 19 in which the modulation frequency component (frequency fc) of the core-line contrast light 15 is used as the transmission band in the core-line contrast device bending portion 21, even if the core-line contrast light 15 and the communication light 13 are included.
Even if are simultaneously emitted, only the modulation frequency component of the core wire reference light 15 can be received by the receiver 20 of the core wire contrast bender 21. As a result, many operating optical fibers 3 accommodated in the optical fiber cable 22 at the work site.
From 3, 3, ..., It becomes possible to perform the core wire comparison of the optical fiber 3 to be compared.
【００１６】一方、心線対照器光源部１７の変調周波数
ｆｃは、図２に示すように、通信信号帯域外に周波数配
置されているため、たとえ図３に示すような心線対照光
遮断型光フィルタ８が未設置で、その心線対照光１５が
加入者端末７の光受信機４に入射されても、加入者端末
に予め内蔵された帯域フィルタ５によって、変調周波数
成分ｆcは遮断されるためサービス品質は劣化せず、運
用中回線の心線対照が可能となる。On the other hand, since the modulation frequency fc of the core line contrast light source unit 17 is arranged outside the communication signal band as shown in FIG. 2, the core line contrast light blocking type as shown in FIG. Even if the optical filter 8 is not installed and the optical fiber reference light 15 is incident on the optical receiver 4 of the subscriber terminal 7, the modulation frequency component fc is blocked by the band filter 5 built in the subscriber terminal in advance. Therefore, the service quality does not deteriorate and it becomes possible to compare the cores of the operating line.
【００１７】上述したように、本実施形態では、光ファ
イバケーブルの心線対照を行うための光源部（信号発生
器１６、心線対照器光源部１７、光カプラ２）と曲げ部
（心線対照器曲げ部２１）で構成される光ファイバ心線
対照器において、心線対照光１５の変調周波数ｆｃを通
信信号帯域外に周波数配置する（図１参照）。また、光
ファイバ３からの放射光１１を受信する心線対照器曲げ
部２１に付属する受光部１８に心線対照光１５の有する
変調周波数成分のみ透過する帯域フィルタ１９を具備す
る。これら２つの手段を光ファイバ心線対照器に施すこ
とにより、心線対照光遮断型光フィルタ８を必要としな
い運用中回線の心線対照が実現可能となる。As described above, in this embodiment, the light source section (the signal generator 16, the core line reference light source section 17, the optical coupler 2) for performing the core line comparison of the optical fiber cable and the bent section (core line). In the optical fiber core wire comparator configured by the contrast device bent portion 21), the modulation frequency fc of the core wire contrast light 15 is arranged outside the communication signal band (see FIG. 1). Further, a band-pass filter 19 that transmits only the modulation frequency component of the core wire contrast light 15 is provided in the light receiving portion 18 attached to the core wire contrast device bending portion 21 that receives the radiated light 11 from the optical fiber 3. By applying these two means to the optical fiber core wire identifier, it becomes possible to realize the core wire identification of the operating line without the need for the core wire identification optical block type optical filter 8.
【００１８】すなわち、上記の構成によれば、心線対照
光１５の変調周波数が、局内装置１と加入者端末７間の
通信光１３（通信信号）の変調周波数帯域外であって、
加入者端末７に内蔵された帯域フィルタ５によって遮断
される周波数帯域内に設定される。つまり、心線対照器
光源部１７を使用し、図２に示すように通信信号と心線
対照信号とを周波数多重することにより、たとえ心線対
照信号光１５が通信光１３と同時に加入者端末７へ入射
しても、心線対照信号光１５の変調周波数に対応する周
波数成分が、通信光１３の変調周波数に対応する帯域透
過特性を有する帯域フィルタ５によって減衰（遮断）さ
れるので、サービスの品質劣化を防ぐことが可能とな
る。このことを詳細に説明すると次のようになる。That is, according to the above configuration, the modulation frequency of the core wire reference light 15 is outside the modulation frequency band of the communication light 13 (communication signal) between the intra-station device 1 and the subscriber terminal 7.
It is set within the frequency band blocked by the band filter 5 built in the subscriber terminal 7. That is, by using the core line contrast light source unit 17 and frequency-multiplexing the communication signal and the core line contrast signal as shown in FIG. 2, even if the core line contrast signal light 15 is the communication light 13 at the same time as the subscriber terminal. Even when the light enters the optical fiber 7, the frequency component corresponding to the modulation frequency of the optical fiber reference signal light 15 is attenuated (cut off) by the band filter 5 having the band transmission characteristic corresponding to the modulation frequency of the communication light 13. It is possible to prevent the deterioration of quality. This will be described in detail below.
【００１９】心線対照光１５が通信光１３と比較して十
分高速で変調されていると仮定する。この時、心線対照
光１５が加入者端末７に入射された場合の符号誤り率BE
Rは以下の式で与えられる。It is assumed that the optical fiber reference light 15 is modulated at a speed sufficiently higher than that of the communication light 13. At this time, the code error rate BE when the optical fiber reference light 15 is incident on the subscriber terminal 7
R is given by the following formula.
【数４】 [Equation 4]
【００２０】ここで、σ2 2は通信光１３と心線対照光１
５とが同時に加入者端末７に入射されたときの等価雑音
電流の全分散であり、心線対照光１５が正弦波変調され
ていると仮定するとσ2 2は以下の式で与えられる。Here, σ 2 2 is the communication light 13 and the optical fiber contrast light 1
5 and 5 are the total dispersions of the equivalent noise currents when they are simultaneously incident on the subscriber terminal 7, and σ 2 2 is given by the following equation, assuming that the optical fiber reference light 15 is sine wave modulated.
【数５】 [Equation 5]
【００２１】ここで、σ2 Shotは心線対照光によるショ
ット雑音電流、Ｋは加入者端末７に内蔵されている帯域
フィルタ５の心線対照光変調周波数における透過率、Ｏ
ＭＩは心線対照光１５の光変調度を示す。図５において
示された実線は式（５）を用い、K＝10-3、ＯＭＩ＝35
％のときのBER特性を示す。本図が示すように、心線対
照光１５の変調周波数を通信信号帯域外に周波数配置す
ることにより、許容受光パワが17dB増加することが分か
る。この許容受光パワの増加により、心線対照光遮断型
光フィルタ８を必要としない、運用中回線の心線対照が
実現可能となる。Here, σ 2 Shot is a shot noise current due to the optical fiber reference light, K is the transmittance of the band filter 5 built in the subscriber terminal 7 at the optical fiber reference modulation frequency, and O
MI indicates the degree of optical modulation of the optical fiber reference light 15. The solid line shown in FIG. 5 uses the equation (5) and K = 10 −3 , OMI = 35.
Shows the BER characteristics when%. As shown in this figure, it is understood that the allowable light receiving power is increased by 17 dB by arranging the modulation frequency of the optical fiber reference light 15 outside the communication signal band. With the increase in the allowable light-receiving power, it becomes possible to realize the core line comparison of the operating line without the need for the core line comparison light blocking optical filter 8.
【００２２】なお、本発明の実施の形態は、上記の形態
に限定されることなく、例えば、帯域フィルタ１９に代
えて変調周波数ｆｃより低い周波数帯域の成分を減衰さ
せる高域フィルタを用いるようにすることなどの変更を
適宜行うことができる。The embodiment of the present invention is not limited to the above-described embodiment. For example, instead of the band filter 19, a high-pass filter for attenuating a component in a frequency band lower than the modulation frequency fc may be used. It is possible to make changes as necessary.
【００２３】[0023]
【発明の効果】本発明によれば、運用中回線の光線路に
おいて、通常、加入者端末近傍に設置される心線対照光
遮断型光フィルタが未設置の場合でも、サービス品質を
劣化させることなく心線対照を行うことを可能にするこ
とから、光通信方式に使用される光線路の低損失化、光
線路設備構築のためのコストの削減が図られる。According to the present invention, the quality of service is deteriorated even in the optical line of the operating line, even when the optical fiber control type optical cutoff type optical filter normally installed near the subscriber terminal is not installed. Since it is possible to perform the optical fiber comparison without using the optical fiber, it is possible to reduce the loss of the optical line used in the optical communication system and reduce the cost for constructing the optical line facility.
【図１】本発明による心線対照を実施するための光線路
構成の概略図。FIG. 1 is a schematic diagram of an optical line configuration for implementing a core wire contrast according to the present invention.
【図２】図１に示す帯域フィルタ１９の透過帯域と、心
線対照光源部１７の変調周波数との配置を示す図。FIG. 2 is a diagram showing an arrangement of a transmission band of a bandpass filter 19 shown in FIG. 1 and a modulation frequency of a core wire reference light source section 17;
【図３】従来の心線対照を実施するための光線路構成の
概略図。FIG. 3 is a schematic diagram of an optical line configuration for performing a conventional optical fiber comparison.
【図４】図３の構成における受信信号スペクトルを示す
模式図。FIG. 4 is a schematic diagram showing a received signal spectrum in the configuration of FIG.
【図５】本発明および従来例における心線対照光の加入
者端末における平均受光パワと符号誤り率BER特性との
関係を示す図。FIG. 5 is a diagram showing the relationship between the average light-receiving power and the code error rate BER characteristic of the subscriber line terminal for the reference optical fiber according to the present invention and the conventional example.
【符号の説明】 １：局内装置 ２：光カプラ ３：光ファイバ（被試験光ファイバ） ４：光受信機 ５：帯域フィルタ ６：受信機 ７：加入者端末 ８：心線対照光遮断型光フィルタ ９，１７：心線対照器光源部 １０，２１：心線対照器曲げ部 １１：放射光（心線対照光あるいは通信光） １２，２０：受光部 １３：通信光 １４，１５：心線対照光 １６：信号発生器 １８：受光部 １９：帯域フィルタ ２２：光ファイバケーブル[Explanation of symbols] 1: Station device 2: Optical coupler 3: Optical fiber (optical fiber under test) 4: Optical receiver 5: bandpass filter 6: Receiver 7: Subscriber terminal 8: Optical fiber cut-off type optical filter 9 and 17: Light source part of core contrast device 10, 21: Bent part of core contrast device 11: Synchrotron light (core contrast light or communication light) 12, 20: Light receiving part 13: Communication light 14,15: Optical fiber contrast light 16: Signal generator 18: Light receiving part 19: Bandpass filter 22: Optical fiber cable
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒川 孝二 東京都新宿区西新宿三丁目19番２号 東日 本電信電話株式会社内 Ｆターム(参考） 2G086 AA01 5K002 AA07 BA03 BA31 EA06 FA01 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Koji Arakawa 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Tohnichi Inside Telegraph and Telephone Corporation F-term (reference) 2G086 AA01 5K002 AA07 BA03 BA31 EA06 FA01
Claims (4)
た光ファイバの心線対照を行うための心線対照方法にお
いて、 局内装置側から被試験対象の光ファイバに対して心線対
照光を入力する際に、 心線対照光の変調周波数を、局内装置と加入者端末間の
通信信号の変調周波数に対して、その帯域外で、かつ加
入者端末に予め内蔵されている帯域フィルタによって心
線対照光の変調周波数のみが遮断されるように周波数配
置することを特徴とする光ファイバ心線対照方法。1. A core line comparison method for performing core line comparison of an optical fiber provided between an in-station device and a subscriber terminal, comprising a core line comparison from an in-station device side to an optical fiber to be tested. When the light is input, the modulation frequency of the core-reference light is outside the band of the modulation frequency of the communication signal between the intra-station device and the subscriber terminal, and is a band filter built in the subscriber terminal in advance. The optical fiber optical fiber identification method, wherein the frequency is arranged so that only the modulation frequency of the optical fiber identification light is blocked by the.
フィルタを用いて心線対照光に対応する信号を復調する
ことを特徴とする請求項１記載の光ファイバ心線対照方
法。2. When receiving the optical fiber reference light, a signal corresponding to the optical fiber reference light is demodulated by using a predetermined bandpass filter that transmits only the modulation frequency component of the optical fiber reference light. The optical fiber core wire control method according to claim 1.
た光ファイバの心線対照を行うための心線対照装置にお
いて、 局内装置と加入者端末間の通信信号の変調周波数の帯域
外であって、かつ加入者端末に内蔵された帯域フィルタ
によって遮断される周波数帯域内に、変調周波数を有す
る心線対照光を発生する心線対照光発生手段と、 心線対照光発生手段によって発生された心線対照光を被
試験対象の光ファイバに入射する光カプラと、 その光ファイバを介して送られてくる心線対照光を受信
する心線対照光受信手段とを備えることを特徴とする光
ファイバ心線対照装置。3. A core checking device for performing a core check of an optical fiber provided between an intra-station device and a subscriber terminal, which is out of a modulation frequency band of a communication signal between the intra-station device and the subscriber terminal. And a core wire reference light generating means for generating a core wire reference light having a modulation frequency in a frequency band cut off by a band filter built in the subscriber terminal, and a core wire reference light generating means. An optical coupler for injecting the selected optical fiber reference light into an optical fiber to be tested, and optical fiber reference light receiving means for receiving the optical fiber reference light sent through the optical fiber. Optical fiber core control device.
の変調周波数成分のみを透過する所定の帯域フィルタを
有していることを特徴とする請求項３記載の光ファイバ
心線対照装置。4. The optical fiber optical fiber identification device according to claim 3, wherein the optical fiber optical fiber receiving means has a predetermined bandpass filter that transmits only the modulation frequency component of the optical fiber identification light. apparatus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001257899A JP4053266B2 (en) | 2001-08-28 | 2001-08-28 | Optical fiber core wire contrast method and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001257899A JP4053266B2 (en) | 2001-08-28 | 2001-08-28 | Optical fiber core wire contrast method and apparatus |
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| Publication Number | Publication Date |
|---|---|
| JP2003065894A true JP2003065894A (en) | 2003-03-05 |
| JP4053266B2 JP4053266B2 (en) | 2008-02-27 |
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| JP2001257899A Expired - Fee Related JP4053266B2 (en) | 2001-08-28 | 2001-08-28 | Optical fiber core wire contrast method and apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008148272A (en) * | 2006-11-16 | 2008-06-26 | Furukawa Electric Co Ltd:The | Coated optical fiber identification method, and identification apparatus |
| JP2008275443A (en) * | 2007-04-27 | 2008-11-13 | Chugoku Electric Power Co Inc:The | Method and device for identifying optical fiber |
| JP2010276862A (en) * | 2009-05-28 | 2010-12-09 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber cord and method of identifying coated optical fiber |
| WO2020100600A1 (en) * | 2018-11-13 | 2020-05-22 | 日本電信電話株式会社 | Optical transmission system and unused channel verification method |
| WO2020100599A1 (en) * | 2018-11-13 | 2020-05-22 | 日本電信電話株式会社 | Optical transmission system and unused channel verification method |
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2001
- 2001-08-28 JP JP2001257899A patent/JP4053266B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008148272A (en) * | 2006-11-16 | 2008-06-26 | Furukawa Electric Co Ltd:The | Coated optical fiber identification method, and identification apparatus |
| JP2008275443A (en) * | 2007-04-27 | 2008-11-13 | Chugoku Electric Power Co Inc:The | Method and device for identifying optical fiber |
| JP2010276862A (en) * | 2009-05-28 | 2010-12-09 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber cord and method of identifying coated optical fiber |
| WO2020100600A1 (en) * | 2018-11-13 | 2020-05-22 | 日本電信電話株式会社 | Optical transmission system and unused channel verification method |
| WO2020100599A1 (en) * | 2018-11-13 | 2020-05-22 | 日本電信電話株式会社 | Optical transmission system and unused channel verification method |
| JP2020080466A (en) * | 2018-11-13 | 2020-05-28 | 日本電信電話株式会社 | Optical transmission system and unused channel verification method |
| JP2020080465A (en) * | 2018-11-13 | 2020-05-28 | 日本電信電話株式会社 | Optical transmission system and unused channel verification method |
| JP7180298B2 (en) | 2018-11-13 | 2022-11-30 | 日本電信電話株式会社 | Optical transmission system and unused path confirmation method |
| JP7180297B2 (en) | 2018-11-13 | 2022-11-30 | 日本電信電話株式会社 | Optical transmission system and unused path confirmation method |
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|---|---|
| JP4053266B2 (en) | 2008-02-27 |
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