WO2011052423A1 - 予等化光送信器および予等化光ファイバ伝送システム - Google Patents
予等化光送信器および予等化光ファイバ伝送システム Download PDFInfo
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- WO2011052423A1 WO2011052423A1 PCT/JP2010/068339 JP2010068339W WO2011052423A1 WO 2011052423 A1 WO2011052423 A1 WO 2011052423A1 JP 2010068339 W JP2010068339 W JP 2010068339W WO 2011052423 A1 WO2011052423 A1 WO 2011052423A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/25137—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using pulse shaping at the transmitter, e.g. pre-chirping or dispersion supported transmission [DST]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5162—Return-to-zero modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/25—Distortion or dispersion compensation
- H04B2210/254—Distortion or dispersion compensation before the transmission line, i.e. pre-compensation
Definitions
- the present invention relates to a pre-equalized optical transmitter that transmits an optical signal in which chromatic dispersion of an optical fiber transmission line is pre-equalized, and a pre-equalized optical fiber transmission system using the pre-equalized optical transmitter.
- a dispersion compensation method a method using a dispersion compensation fiber having chromatic dispersion having a sign opposite to that of an optical fiber transmission line is widely implemented. Further, in recent high-speed optical fiber transmission systems of 40 Gb / s or more, the signal waveform is easily distorted by a slight change in chromatic dispersion due to temperature, fiber interruption, etc. With a dispersion compensating fiber with a fixed chromatic dispersion, Rather, a tunable dispersion compensator that can variably set the amount of chromatic dispersion is used.
- a variable dispersion compensator using a pre-equalization method is known.
- a digital filter having a transfer function h ⁇ 1 (t) opposite to the transfer function h (t) of the optical fiber transmission line is provided on the transmission side, and the input data series D (t) and the transfer function h -1 (t) is performed (for example, see Non-Patent Document 1).
- This method is called pre-equalization (or pre-distortion or pre-coding) because distortion is equalized in advance on the transmission side in order to obtain a received signal waveform without distortion after passing through an optical fiber transmission line. Yes.
- the pre-equalization method is electrically executed using a digital filter, a D / A converter (digital / analog converter), and a vector modulator.
- the digital filter is realized by an FIR (Finite Impulse Response) filter configured by a lookup table.
- the electrical signal calculated by the FIR filter is converted to an analog signal by the D / A converter, and the orthogonal modulation of the light is executed by the vector modulator, so that the signal waveform distortion due to the chromatic dispersion is obtained after passing through the optical fiber transmission line.
- An optical signal having a complex electric field that can be compensated can be generated.
- the vector modulator When there is no chromatic dispersion, the vector modulator operates as a data modulator used in normal light modulation. Pre-equalization can be applied not only to intensity modulation (On-Off Keying) but also to phase shift modulation (Phase-Shift Keying). Note that the pre-equalization method described above targets the NRZ (Non-Return to Zero) format used in a general optical fiber transmission system as the format of the optical signal.
- NRZ Non-Return to Zero
- RZ Return to Zero optical signals
- it is considered to generate a pre-equalized RZ format optical signal so that the pre-equalization can be applied to an ultra-long distance optical fiber transmission system.
- a digital filter In order to generate a pre-equalized RZ format optical signal, a digital filter, a D / A converter, and a vector modulator that modulate a general input data sequence D (t) in NRZ format to an NRZ format optical signal It is conceivable that an optical modulator called a pulse carver for converting an NRZ optical signal into RZ is connected in series at the subsequent stage.
- a dispersion management method is adopted so that a certain degree of chromatic dispersion is compensated in the optical fiber transmission line itself and transmission characteristics are optimized.
- two sections of an optical fiber transmission line are connected to G.I. 655 fiber (non-zero dispersion-shifted fiber) and one section in the latter stage is ITU-T standard G.264. 652 fiber (single mode fiber having zero dispersion at 1.3 ⁇ m), and G.
- the negative chromatic dispersion accumulated in the 655 fiber is It is canceled out by the positive chromatic dispersion of the 652 fiber.
- dispersion management when pre-equalization is applied to ultra-long distance optical fiber transmission systems.
- Non-Patent Document 2 a pre-equalized RZ format optical signal can be generated, but at least four high-frequency mixers, six high-frequency adders, and four high-frequency delays can be generated. A precise analog circuit consisting of elements is required. Therefore, there is a problem that the circuit size, power consumption and cost all increase.
- the present invention has been made to solve the above-described problems, and provides a pre-equalized optical transmitter capable of generating a pre-equalized RZ optical signal with a simple and inexpensive configuration. It is another object of the present invention to obtain a pre-equalized optical fiber transmission system appropriately distributed and managed by using this pre-equalized optical transmitter.
- a pre-equalization optical transmitter is a pre-equalization optical transmitter that transmits an optical signal in which chromatic dispersion of an optical fiber transmission line is pre-equalized, and includes an input data sequence in NRZ format and an input in NRZ format RZ conversion means for generating an RZ-format input data sequence based on a double-speed clock of the data sequence, and convolution of the RZ-format input data sequence and a desired transfer function according to the chromatic dispersion of the optical fiber transmission line
- light modulation means for modulating light from the light source and outputting an RZ-format optical signal.
- the pre-equalized optical fiber transmission system includes a pre-equalized optical fiber in which a transmitting station and a receiving station including the above-described pre-equalized optical transmitter are connected to each other via an optical fiber transmission line.
- the receiving station has dispersion compensation means for compensating for chromatic dispersion almost half of the chromatic dispersion of the optical fiber transmission line
- the pre-equalization optical transmitter has a wavelength of the other half of the optical fiber transmission line. It compensates for dispersion.
- the RZ conversion means generates the input data sequence in the RZ format based on the input data sequence in the NRZ format and the double speed clock of the input data sequence in the NRZ format.
- the pre-equalization data generating means generates pre-equalization data by convolution calculation of an RZ format input data sequence and a desired transfer function according to the chromatic dispersion of the optical fiber transmission line.
- the D / A conversion means D / A converts the pre-equalization data and outputs analog pre-equalization data, and the light modulation means modulates light from the light source based on the analog pre-equalization data, RZ optical signal is output. Therefore, it is possible to obtain a pre-equalized optical transmitter capable of generating a pre-equalized RZ format optical signal with a simple and inexpensive configuration.
- the receiving station has dispersion compensation means for compensating for chromatic dispersion that is approximately half of the chromatic dispersion of the optical fiber transmission line, and is included in the transmitting station.
- the equalized optical transmitter compensates for the chromatic dispersion of the remaining half of the optical fiber transmission line.
- FIG. 1 is a block diagram showing a pre-equalized optical transmitter 10 according to Embodiment 1 of the present invention.
- the pre-equalization optical transmitter 10 transmits an optical signal in which chromatic dispersion of the optical fiber transmission line is pre-equalized.
- a pre-equalization optical transmitter 10 includes an RZ conversion circuit (RZ conversion means) 11, a digital filter (pre-equalization data generation means) 12, a D / A converter (D / A conversion means) 13a, 13 b, a laser light source 14, and a vector modulator (light modulation means) 15.
- the RZ conversion circuit 11 is composed of an AND circuit.
- the RZ conversion circuit 11 receives an input data series D (t) in 10 Gb / s NRZ format and a clock p (t) in 10 GHz to generate an input data series in RZ format.
- the 10 GHz clock p (t) takes binary values of 0 and 1 in one cycle, it can be regarded as a 20 Gb / s data series. That is, the clock p (t) is a double speed clock of the input data series D (t). Also, the RZ format input data series output from the AND circuit can be regarded as a 20 Gb / s data series.
- the RZ conversion circuit 11 is not limited to an AND circuit, and another circuit may be used as long as it converts a NRZ format signal into an RZ format signal.
- the digital filter 12 is configured by a memory, for example, and is realized by a look-up table having a function as an FIR filter.
- the digital filter 12 generates pre-equalization data by a convolution operation between an RZ-format input data sequence from the RZ conversion circuit 11 and a desired transfer function corresponding to the chromatic dispersion of the optical fiber transmission line, and generates I-phase ( In-phase) pre-equalization data and Q-phase (Quadrature-phase) pre-equalization data are output.
- the digital filter 12 executes the calculation represented by the following expression (1).
- the input data series in the RZ format input to the digital filter 12 is developed in parallel according to the processing speed of the lookup table.
- the digital filter 12 has the same number of lookup tables as the number of parallel expansions, and generates pre-equalized data according to the input data series expanded in parallel.
- the digital filter 12 as a whole performs computation at a speed almost twice as fast as the input RZ format input data series in consideration of oversampling in the D / A converters 13a and 13b at the subsequent stage. Further, as described above, since the input data sequence in the RZ format is considered to have twice the amount of data as the input data sequence D (t) in the NRZ format, the digital filter 12 has the NRZ format. The calculation is executed at a speed that is approximately four times (40 GHz) or more the symbol rate of the input data series D (t).
- the D / A converters 13a and 13b convert the I-phase pre-equalization data and the Q-phase pre-equalization data from the digital filter 12 from digital signals to analog signals, respectively, and I-phase analog pre-equalization data and Q Outputs analog pre-equalization data for phase.
- the D / A converters 13a and 13b operate at a speed that is approximately four times (40 GHz) or more the symbol rate of the input data series D (t) in the NRZ format.
- the vector modulator 15 modulates the laser light from the laser light source 14 based on the I-phase analog pre-equalization data and the Q-phase analog pre-equalization data from the D / A converters 13a and 13b, and performs pre-equalization.
- the 10 Gb / s optical signal in the RZ format is output.
- the 10 Gb / s RZ optical signal shown in FIG. 1 illustrates an optical signal when the chromatic dispersion amount is 0 (that is, when the pre-equalization amount is 0). When equalized, the waveform becomes a complex waveform like noise on the time axis.
- the 10 Gb / s NRZ format input data series D (t) has been described as an example.
- the present invention is not limited to this, and the RZ format input data sequence is generated based on the NRZ format input data sequence and the double-speed clock of the NRZ format input data sequence, and the digital filter 12 and the D / A converter 13a. , 13b can execute the processing at a speed almost four times the symbol rate of the input data series D (t), the same effect can be obtained regardless of the speed of the signal. .
- FIG. 2 is a block diagram showing the pre-equalized optical fiber transmission system according to Embodiment 1 of the present invention.
- the pre-equalized optical fiber transmission system includes a transmitting station 1, a receiving station 2, negative dispersion transmission path optical fibers 3a to 3d, a positive dispersion transmission path optical fiber 4, and an optical repeater 5.
- the transmitting station 1 includes the pre-equalized optical transmitter 10 shown in FIG. 1, and the receiving station 2 includes a receiver 20 and a dispersion compensating fiber (dispersion compensating means) 21.
- the negative dispersion transmission line optical fibers 3a to 3d, the positive dispersion transmission line optical fiber 4, and the optical repeater 5 constitute an optical fiber transmission line.
- the pre-equalization optical transmitter 10 transmits an optical signal in which chromatic dispersion of the optical fiber transmission line is pre-equalized.
- the dispersion compensating fiber 21 has chromatic dispersion having a sign opposite to that of the optical fiber transmission line, and performs dispersion compensation.
- the receiver 20 receives an optical signal that has been dispersion-compensated by the dispersion-compensating fiber 21.
- the negative dispersion transmission line optical fibers 3a to 3d are optical fibers having negative chromatic dispersion
- the positive dispersion transmission line optical fiber 4 is an optical fiber having positive chromatic dispersion.
- the optical repeater 5 connects optical fibers to each other. In the pre-equalization optical fiber transmission system shown in FIG. 2, after the transmission of the two sections of the negative dispersion transmission line optical fiber, the dispersion management is performed so that the cumulative dispersion becomes zero by the transmission of the one section of the positive dispersion transmission line optical fiber. ing.
- the negative chromatic dispersion is obtained when the optical signal arrives at the receiving station 2.
- the dispersion compensation fiber 21 having positive chromatic dispersion is used for dispersion compensation. This is the post 100% dispersion compensation shown in FIG.
- the pre-equalization optical transmitter 10 compensates all of the chromatic dispersion of the optical fiber transmission line, as shown in FIG. 2B, the pre-equalization optical transmitter 10 gives a large positive chromatic dispersion. This eliminates the need for dispersion compensation at the receiving station 2. This is called pre-100% dispersion compensation.
- dispersion compensation fiber was installed in the transmitter station 1 to realize pre-100% dispersion compensation.
- pre-100% dispersion compensation is performed, an optical fiber is realized. It is known that good transmission characteristics cannot be obtained in a transmission state where the nonlinearity exists.
- the pre-equalization optical transmitter 10 compensates for nearly 50% of the chromatic dispersion of the optical fiber transmission line, and the receiving station 2 compensates for the remaining 50% of the chromatic dispersion of the optical fiber transmission line. It is possible to compensate for this. In this case, relatively good transmission characteristics can be obtained even in a transmission state where nonlinearity of the optical fiber exists.
- the parameters of the digital filter 12 shown in FIG. 1 are set so that the pre-equalization optical transmitter 10 compensates about 50% of the accumulated chromatic dispersion.
- a dispersion compensating fiber 21 having a chromatic dispersion amount corresponding to about 50% of the remaining chromatic dispersion is installed.
- the present invention is not limited to this, and the same effect can be obtained even in an optical fiber transmission line having a different number of sections or in an optical fiber transmission line in which negative and positive are reversed.
- dispersion compensation of 50% pre and 50% post has been described as an example.
- the present invention is not limited to this, and the same effect can be obtained even when it is not exactly half, such as 55% and 45%. Can be obtained.
- the RZ conversion means is based on the NRZ format input data sequence and the double-speed clock of the NRZ format input data sequence. Generate the input data series.
- the pre-equalization data generating means generates pre-equalization data by convolution calculation of an RZ format input data sequence and a desired transfer function according to the chromatic dispersion of the optical fiber transmission line.
- the D / A conversion means D / A converts the pre-equalization data and outputs analog pre-equalization data, and the light modulation means modulates light from the light source based on the analog pre-equalization data, RZ optical signal is output. Therefore, it is possible to obtain a pre-equalized optical transmitter capable of generating a pre-equalized RZ format optical signal with a simple and inexpensive configuration.
- the receiving station has dispersion compensation means for compensating for chromatic dispersion that is approximately half of the chromatic dispersion of the optical fiber transmission line, and is included in the transmitting station.
- the pre-equalized optical transmitter compensates for the chromatic dispersion of the remaining half of the optical fiber transmission line.
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Abstract
Description
この方式は、光ファイバ伝送路の通過後に歪みのない受信信号波形を得るために、送信側で予め歪みを等化することから、予等化(または、プリディストーションもしくはプリコーディング)と呼ばれている。
なお、上述した予等化方式は、光信号の形式として、一般的な光ファイバ伝送システムに用いられるNRZ(Non-Return to Zero)形式を対象としている。
そこで、上記の問題を解決するために、高周波ミキサを用いて両側波帯を合成する方法が提案されている(例えば、非特許文献2参照)。
この方法によれば、時間軸上で変調を施す代わりに、周波数領域で変調を施すことにより、NRZ形式の光信号をRZ化するものである。
上述した非特許文献2に示された合成方法によれば、予等化されたRZ形式の光信号を生成することができるものの、少なくとも4つの高周波ミキサ、6つの高周波加算器および4つの高周波遅延素子からなる精密なアナログ回路が必要となる。そのため、回路サイズ、消費電力およびコストが何れも増大するという問題がある。
そのため、簡素かつ安価な構成により、予等化されたRZ形式の光信号を生成することができる予等化光送信器を得ることができる。
これにより、良好な伝送特性を得ることができ、適切に分散マネジメントされた予等化光ファイバ伝送システムを得ることができる。
図1は、この発明の実施の形態1に係る予等化光送信器10を示す構成図である。予等化光送信器10は、光ファイバ伝送路の波長分散を予等化した光信号を送信する。
図1において、予等化光送信器10は、RZ変換回路(RZ変換手段)11と、デジタルフィルタ(予等化データ生成手段)12と、D/Aコンバータ(D/A変換手段)13a、13bと、レーザ光源14と、ベクトル変調器(光変調手段)15とを備えている。
RZ変換回路11は、AND回路で構成されている。RZ変換回路11には、10Gb/sのNRZ形式の入力データ系列D(t)と、10GHzのクロックp(t)とが入力され、RZ形式の入力データ系列が生成される。
なお、RZ変換回路11は、AND回路に限定されず、NRZ形式の信号をRZ形式の信号に変換する回路であれば、別の回路を用いてもよい。
ここで、D/Aコンバータ13a、13bは、デジタルフィルタ12と同様に、NRZ形式の入力データ系列D(t)のシンボルレートのほぼ4倍(40GHz)以上の速度で動作する。
なお、図1に示した10Gb/sのRZ形式の光信号は、波長分散量が0である場合(すなわち、予等化量が0である場合)の光信号を例示しているが、予等化されると、波形は時間軸で雑音のような複雑な波形となる。
図2において、この予等化光ファイバ伝送システムは、送信局1、受信局2、負分散伝送路光ファイバ3a~3d、正分散伝送路光ファイバ4および光中継器5を備えている。
また、送信局1は、図1に示した予等化光送信器10を含み、受信局2は、受信器20と分散補償ファイバ(分散補償手段)21とを有している。
ここで、負分散伝送路光ファイバ3a~3d、正分散伝送路光ファイバ4および光中継器5により、光ファイバ伝送路が構成されている。
予等化光送信器10は、上述したように、光ファイバ伝送路の波長分散を予等化した光信号を送信する。分散補償ファイバ21は、光ファイバ伝送路と逆符号の波長分散を有し、分散補償を実行する。受信器20は、分散補償ファイバ21で分散補償された光信号を受信する。
図2に示した予等化光ファイバ伝送システムでは、負分散伝送路光ファイバ2区間の伝送の後、正分散伝送路光ファイバ1区間の伝送により、累積分散が0になるように分散マネジメントされている。
具体的には、累積する波長分散の約50%分を予等化光送信器10が補償するように、図1に示したデジタルフィルタ12のパラメータを設定する。また、受信局2では、波長分散の残り約50%分に相当する波長分散量を有する分散補償ファイバ21を設置する。
そのため、簡素かつ安価な構成により、予等化されたRZ形式の光信号を生成することができる予等化光送信器を得ることができる。
これにより、良好な伝送特性を得ることができ、適切に分散マネジメントされた予等化光ファイバ伝送システムを得ることができる。
Claims (3)
- 光ファイバ伝送路の波長分散を予等化した光信号を送信する予等化光送信器であって、
NRZ形式の入力データ系列と前記NRZ形式の入力データ系列の2倍速のクロックとに基づいて、RZ形式の入力データ系列を生成するRZ変換手段と、
前記RZ形式の入力データ系列と前記光ファイバ伝送路の波長分散に応じた所望の伝達関数との畳み込み演算によって、予等化データを生成する予等化データ生成手段と、
前記予等化データをD/A変換してアナログ予等化データを出力するD/A変換手段と、
前記アナログ予等化データに基づいて光源からの光を変調し、RZ形式の光信号を出力する光変調手段と、
を備えた予等化光送信器。 - 前記予等化データ生成手段および前記D/A変換手段は、前記NRZ形式の入力データ系列のシンボルレートのほぼ4倍以上の速度で動作する
請求項1に記載の予等化光送信器。 - 請求項1または請求項2に記載の予等化光送信器を含む送信局と受信局とが、光ファイバ伝送路を介して互いに接続された予等化光ファイバ伝送システムであって、
前記受信局は、前記光ファイバ伝送路の波長分散のほぼ半分の波長分散を補償する分散補償手段を有し、
前記予等化光送信器は、前記光ファイバ伝送路の残り半分の波長分散を補償する
予等化光ファイバ伝送システム。
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EP10826555.4A EP2495889A4 (en) | 2009-10-29 | 2010-10-19 | OPTICAL PRE-EQUALIZATION TRANSMITTER AND OPTICAL FIBER TRANSMISSION SYSTEM FOR PRE-EQUALIZATION |
US13/498,626 US20120201546A1 (en) | 2009-10-29 | 2010-10-19 | Pre-equalization optical transmitter and pre-equalization optical fiber transmission system |
CN2010800485784A CN102598541A (zh) | 2009-10-29 | 2010-10-19 | 预均衡光发送器以及预均衡光纤传送系统 |
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CN103999381B (zh) * | 2011-10-20 | 2016-06-01 | 三菱电机株式会社 | 预均衡光发送机以及预均衡光发送方法 |
JP2014033426A (ja) * | 2012-07-11 | 2014-02-20 | Nippon Telegr & Teleph Corp <Ntt> | 光変調装置、光変調システム、及び光変調方法 |
JP2016122910A (ja) * | 2014-12-24 | 2016-07-07 | 日本オクラロ株式会社 | 光通信装置 |
JP2019036881A (ja) * | 2017-08-18 | 2019-03-07 | 日本電信電話株式会社 | 光送信機及び光伝送システム |
Also Published As
Publication number | Publication date |
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EP2495889A4 (en) | 2015-01-21 |
US20120201546A1 (en) | 2012-08-09 |
CN102598541A (zh) | 2012-07-18 |
EP2495889A1 (en) | 2012-09-05 |
JPWO2011052423A1 (ja) | 2013-03-21 |
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