JP7186788B2 - 光通信における次元変換 - Google Patents
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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
- H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
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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
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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
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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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
- H04B10/40—Transceivers
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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
-
- 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
- H04B10/60—Receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
- H04L1/203—Details of error rate determination, e.g. BER, FER or WER
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03592—Adaptation methods
- H04L2025/03598—Algorithms
- H04L2025/03611—Iterative algorithms
- H04L2025/03636—Algorithms using least mean square [LMS]
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Description
である。整数の組のような2値データではない値に対しては、例えば、特定の整数値の確率を他に可能性のある整数値の確率の合計値で割った値の対数のような他の数値を使用することができる。
Claims (15)
- 偏光ビームスプリッタ(344)、光ハイブリッド(358)、光検出器(362)、アナログ-デジタル変換器(324,326,328,330)、及びプロセッサ(314)を含む光受信器(102,300)で行われる方法であって、
光受信器と光送信器(102,200)との間で確立される光通信チャネル(104)を介して光信号(360)を受信し、該受信された光信号は、前記光送信器で生成された変調光信号が劣化したものを含み、
前記偏光ビームスプリッタによって前記受信された光信号を偏波成分(354,356)に分離し、
前記光ハイブリッドによって前記偏波成分を処理して処理済み成分(346,348,350,352)を生成し、
前記光検出器によって前記処理済み成分を受信アナログ信号(332,334,336,338)に変換し、
前記アナログ-デジタル変換器によって前記受信アナログ信号を前記受信光信号の複数の第1次元に対応する受信デジタル信号(316,318,320,322)に変換し、前記第1次元は、前記光送信器で変調された光信号キャリア(242)の次元に対応してマルチビットシンボル(212)を表し、前記第1次元は、2以上のタイムスロットにわたって分配され、
前記プロセッサによって前記受信デジタル信号に逆次元変換を適用して(806)複数の第2次元に対応する初期デジタル駆動信号推定値(370,372,374,376)を生成し、
前記プロセッサにより前記初期デジタル駆動信号推定値を処理して(808)前記マルチビットシンボルの推定値を生成する、
方法。 - 前記受信デジタル信号に対する前記逆次元変換の適用は、前記受信デジタル信号における信号劣化を平均化し、前記信号劣化は、雑音、非線形効果、偏波依存性損失又は利得(PDL)、及びアナログ不完全性のうち1つ以上によって生じる、請求項1に記載された方法。
- 前記逆次元変換は、実質的に線形で実質的にユニタリな行列を含む、請求項1又は請求項2に記載の方法。
- 前記光通信チャネルにおける線形インペアメントを補償するための適応等化回路を用いて前記受信光信号を処理する、請求項1から3のいずれか一項に記載の方法。
- プロセッサ(214)、デジタル-アナログ変換器(224,226,228,230)、電気光学変調器(250,252)、及びビームコンバイナ(258)を含む光送信器(102,200)で行われる方法であって、
前記プロセッサによってマルチビットシンボル(212)を表す初期デジタル駆動信号を生成し(702)、
前記プロセッサによって前記初期デジタル駆動信号から変換デジタル駆動信号(216,218,220,222)を生成し(704)、前記変換デジタル駆動信号は、光信号キャリア(242)の複数の第1次元を用いてそれぞれのマルチビットシンボルを表すように構成され、前記第1次元は、2以上の別個のタイムスロットにわたって分配され、前記初期デジタル駆動信号は、前記光信号キャリアの複数の第2次元を用いてそれぞれのマルチビットシンボルを表すように構成され、前記第2次元は前記第1次元とは異なり、
前記光送信器と光受信器(102,300)との間で確立される光通信チャネル(104)を介した伝送のために光信号(260)を生成し(706)、
前記デジタル-アナログ変換器によって前記変換デジタル駆動信号をそれぞれのアナログ信号(232,234,236,238)に変換し、
前記電気光学変調器によって前記アナログ信号を用いて前記光信号キャリアの偏波成分(246,248)を変調して変調偏波信号(254,256)を生成し、
前記ビームコンバイナによって前記変調偏波信号を結合して前記光信号を形成する、
方法。 - 前記変換デジタル駆動信号は、前記初期デジタル駆動信号に次元変換を適用することにより生成される、請求項5に記載の方法。
- 前記次元変換は、実質的に線形で実質的にユニタリな行列を含む、請求項6に記載の方法。
- 前記変換デジタル駆動信号は、前記初期デジタル駆動信号からルックアップテーブルを用いて生成される、請求項5に記載の方法。
- さらに、前記プロセッサによって前記変換デジタル駆動信号に周波数領域処理を適用する(906)、請求項5から8のいずれか一項に記載の方法。
- 前記複数の第2次元の数は、前記複数の第1次元の数より少ない、請求項1から9のいずれか一項に記載の方法。
- 前記2以上のタイムスロットは、非連続的である、請求項1から10のいずれか一項に記載の方法。
- 前記第1次元は、2つの偏波を含む、請求項1から11のいずれか一項に記載の方法。
- 前記第1次元は、少なくとも1つの偏波の同相成分(I)及び直交成分(Q)を含む、請求項1から12のいずれか一項に記載の方法。
- 偏光ビームスプリッタ(344)、光ハイブリッド(358)、光検出器(362)、アナログ-デジタル変換器(324,326,328,330)、及びプロセッサ(314)を含む光受信器(102,300)であって、前記光受信器は、請求項1から4のいずれか一項に記載の方法又は請求項1から4のいずれか一項に従属する請求項10から13のいずれか一項に記載の方法を実施するように構成される、光受信器。
- プロセッサ(214)、デジタル-アナログ変換器(224,226,228,230)、電気光学変調器(250,252)、及びビームコンバイナ(258)を含む光送信器(102,200)であって、前記光送信器は、請求項5から9のいずれか一項に記載の方法又は請求項5から9のいずれか一項に従属する請求項10から13のいずれか一項に記載の方法を実施するように構成される、光送信器。
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PCT/IB2019/054204 WO2019234536A1 (en) | 2018-06-08 | 2019-05-21 | Dimensional transformation in optical communication |
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