JP5015288B2 - 光伝送方法および装置 - Google Patents
光伝送方法および装置 Download PDFInfo
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- JP5015288B2 JP5015288B2 JP2010112843A JP2010112843A JP5015288B2 JP 5015288 B2 JP5015288 B2 JP 5015288B2 JP 2010112843 A JP2010112843 A JP 2010112843A JP 2010112843 A JP2010112843 A JP 2010112843A JP 5015288 B2 JP5015288 B2 JP 5015288B2
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- Prior art keywords
- polarization
- dpsk
- apol
- optical signal
- modulator
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Classifications
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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
- H04B10/5055—Laser transmitters using external modulation using a pre-coder
-
- 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
-
- 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
- H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
-
- 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
- H04B10/532—Polarisation modulation
-
- 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
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Description
高分散型疑似線形高ビット速度長距離伝送方式において、チャネル内四光波混合(IFWM)およびチャネル内交差位相変調(IXPM)は、非線形ペナルティの主たる原因である。差分位相シフトキーイング(DPSK)変調形式を使用すると、オン・オフ・キーイング(OOK)と比較してこれらのペナルティを緩和することができる。いくつかの40Gb/sDPSK超長距離DWDM伝送実験は、優れた能力および距離性能を示した。IXPMに対する強い抵抗は、各時間スロットにおける等しいパルス・エネルギーから生じる。RZ−OOKと比較してゼロ復帰(RZ)−DPSKのパルス・エネルギーを低下させ、2つの隣接パルスの非線形位相シフト間の補正を行うと、IFWMに対するRZ−DPSKの強健性が向上することも証明された。
さらに、DPSKデータをプリコード化およびコード化する従来技術の方法は、交代偏光形式化信号を効率的に生成するのに適さない。
しかし、添付の図面は、本発明の例示的な実施形態のみを示し、したがって本発明の範囲を制限するものと見なされるべきではない。
変調器360の出力に対する電場ベクトルの方位は、
Claims (9)
- 差分位相シフトキーイング(DPSK)を用いて光信号上にデータを変調し、DPSK変調光信号を生成するステップと、
交代偏光DPSK(APol−DPSK)信号を生成するために、連続光ビットが実質的に直交偏光を有するように、前記DPSK変調光信号の連続光ビットの偏光を交代するステップと、
偶数ビット遅延線干渉計を用いて前記APol−DPSK信号を復調するステップとを含む方法。 - 前記光信号は、送信された前記APol−DPSK信号の連続光ビットの偏光が実質的に直交するように、所定の角度に配向した偏光を有することを特徴とする請求項1に記載の方法。
- 交代偏光位相シフトキーイング(APol−PSK)送信方法であって、
偶数の光ビット周期により分割される2つの光ビット間で、位相シフトキーイング(PSK)を用いて、光信号上にデータを変調するステップと、
交代偏光PSK(APol−PSK)信号を生成するために、連続光ビットが実質的に直交偏光を有するように、前記PSK変調された光信号の連続光ビットの偏光を交代するステップとを含み、
前記変調するステップと前記偏光を交代するステップは、少なくとも1つのアームに偏光回転デバイスを有するマッハ−ツェンダー変調器により同時に実行され、
前記マッハ−ツェンダー変調器の両方のアームへの入力信号は、実質的に同じ偏光を有することを特徴とする方法。 - 差分位相シフトキーイング(DPSK)変調光信号を生成するために、光信号上にデータを変調するためのDPSK変調器と、
交代偏光DPSK(APol−DPSK)変調光信号を生成するために、前記DPSK変調光信号の連続光ビットの偏光を交代するための偏光オルタネータと、
前記データを前記APol−DPSK変調光信号から抽出するために、前記APol−DPSK変調光信号を復調するための偶数ビット遅延線干渉計を有する復調器とを含むAPol−DPSK送信を使用するシステム。 - 前記偏光オルタネータは、正弦波RF電圧により駆動される位相変調器を含むことを特徴とする請求項4に記載のシステム。
- 前記偏光オルタネータは、ビット速度の半分の速度で伝わる方形パルス列により駆動される位相変調器を含むことを特徴とする請求項4に記載のシステム。
- 前記偏光オルタネータは、1つのアームに偏光回転デバイスを有する改造型マッハ−ツェンダー変調器を含むことを特徴とする請求項4に記載のシステム。
- 前記変調器の2つのアームに印加される駆動電圧の差は、反復速度が実質的にビット速度の半分である正弦波又は方形波で、前記駆動電圧の差の振幅は前記変調器のVπに設定される請求項7に記載のシステム。
- 差分位相シフトキーイング(DPSK)変調光信号を生成するために、差分位相シフトキーイングを用いて、光信号上にデータを変調するための手段と、
交代偏光DPSK(APol−DPSK)信号を生成するために連続光ビットが実質的に直交偏光を有するように、前記DPSK変調光信号の連続光ビットの偏光を交代するための手段と、
偶数ビット遅延線干渉計を用いて、前記APol−DPSKを復調するための手段を含む装置。
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54650404P | 2004-02-20 | 2004-02-20 | |
US60/546504 | 2004-02-20 | ||
US10/815033 | 2004-03-31 | ||
US10/815,033 US7844186B2 (en) | 2004-02-20 | 2004-03-31 | Method and apparatus for optical transmission |
Related Parent Applications (1)
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JP2005041475A Division JP4546280B2 (ja) | 2004-02-20 | 2005-02-18 | 光伝送方法および装置 |
Publications (2)
Publication Number | Publication Date |
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JP2010187407A JP2010187407A (ja) | 2010-08-26 |
JP5015288B2 true JP5015288B2 (ja) | 2012-08-29 |
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JP2005041475A Expired - Fee Related JP4546280B2 (ja) | 2004-02-20 | 2005-02-18 | 光伝送方法および装置 |
JP2010112843A Expired - Fee Related JP5015288B2 (ja) | 2004-02-20 | 2010-05-17 | 光伝送方法および装置 |
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Country Status (4)
Country | Link |
---|---|
US (1) | US7844186B2 (ja) |
EP (1) | EP1566903B1 (ja) |
JP (2) | JP4546280B2 (ja) |
DE (1) | DE602005000213T2 (ja) |
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-
2004
- 2004-03-31 US US10/815,033 patent/US7844186B2/en not_active Expired - Fee Related
-
2005
- 2005-02-08 DE DE602005000213T patent/DE602005000213T2/de active Active
- 2005-02-08 EP EP05250714A patent/EP1566903B1/en not_active Expired - Fee Related
- 2005-02-18 JP JP2005041475A patent/JP4546280B2/ja not_active Expired - Fee Related
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2010
- 2010-05-17 JP JP2010112843A patent/JP5015288B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP4546280B2 (ja) | 2010-09-15 |
DE602005000213D1 (de) | 2006-12-14 |
JP2010187407A (ja) | 2010-08-26 |
EP1566903A1 (en) | 2005-08-24 |
EP1566903B1 (en) | 2006-11-02 |
US7844186B2 (en) | 2010-11-30 |
JP2005237010A (ja) | 2005-09-02 |
US20050185968A1 (en) | 2005-08-25 |
DE602005000213T2 (de) | 2007-09-06 |
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