JP4668164B2 - 位相変調で直接変調されたレーザ光伝送システム - Google Patents
位相変調で直接変調されたレーザ光伝送システム Download PDFInfo
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- JP4668164B2 JP4668164B2 JP2006336993A JP2006336993A JP4668164B2 JP 4668164 B2 JP4668164 B2 JP 4668164B2 JP 2006336993 A JP2006336993 A JP 2006336993A JP 2006336993 A JP2006336993 A JP 2006336993A JP 4668164 B2 JP4668164 B2 JP 4668164B2
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency 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
- H04B10/25—Arrangements specific to fibre transmission
-
- 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
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity 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
- H04B10/58—Compensation for non-linear transmitter output
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Description
本発明は、アナログ信号のための光伝送システムに関連し、特に、直接変調される固体素子レーザに関連する。より詳細には、本発明は、半導体レーザにおけるチャープ(chirp)から生じる位相変調された要素の相殺(cancellation)に関連する。この半導体レーザにおけるチャープは、レーザにおける固有の非線形性に起因して、直接変調された入力から、半導体レーザの出力を歪ませる。
発光ダイオード(LED)又は半導体レーザのアナログ輝度を、電気信号で直接変調することは、音声及び映像信号のようなアナログ信号を、光ファイバ上で伝送するための技術分野で知られている最も単純な方法の一つと考えられている。そのようなアナログ伝送技術は、デジタル・パルス符号変調のようなデジタル伝送、又は、アナログ又はパルス周波数変調に比して、実質的により小さい帯域幅要求という利点を持つが、振幅変調の使用は、光源のノイズと非線形性という問題から悪影響を受け得る。
本発明の目的は、直接変調されたレーザを用いた、改善された光伝送システムを提供することである。
簡単に、及び一般的意味において、本発明は、分散的な光ファイバ・リンクを通して、広帯域のアナログ無線周波数信号入力を受信するための入力、光信号を生成するための半導体レーザ、及び、レーザを、アナログ信号で直接変調するための変調回路であって、位相変調要素に起因して光ファイバ・リンクの受信器端に存在する信号における歪を削減するための光位相変調器を含む変調回路、を有する遠隔の受信器に伝送するための、変調された光信号を生成するための光送信機を提供する。
本発明の新規な特徴及び特性は、添付の特許請求の範囲に規定される。しかし、本発明自身並びに他の特徴及びその利点は、添付の図面と共に、特定の実施例の詳細な説明を参照することによって最も良く理解されであろう。
14 光ファイバ
18 端子
20 ライン
22 端子
24 ライン
26 ファイバ・リンク
30 光ファイバ・パス
50 ライン
101 アナログRF信号の入力源
103 RF調整回路
106 補償チルト回路
107 位相遅延回路
110 ファイバ接続器
111 ファイバ
113 光ファイバ出力
115 RF信号
Claims (11)
- 光ファイバ・リンクを介して、遠隔の受信器に送信するための変調された光信号を生成するための光送信器であって、
レーザ、
前記レーザを、アナログRF信号で直接振幅変調して、振幅変調された情報を含有する要素及び位相変調要素を含む出力光信号を生成するための、前記レーザに結合された入力、及び、
前記遠隔の受信器で受信される光信号に存在する歪を低減するための、前記レーザの出力に結合された位相変調器であって、前記レーザの出力を、該位相変調器に入力された前記アナログRF信号及びトーン信号のうち少なくとも一方の信号を用いて位相変調するための位相変調器、
を備える光送信器。 - 前記位相変調器が、前記RF信号を用いて前記レーザの出力光信号内の位相変調された要素を相殺する、請求項1に記載の送信器。
- 前記位相変調器が、前記トーン信号を用いて前記遠隔受信器において受信される光信号が受ける誘導ブリユアン散乱閾値を増加させる、請求項1に記載の送信器。
- 有効な位相変調相殺が起こるように、変調している電気信号が前記変調された出力光信号と同期されるように、前記アナログRF信号に接続された入力、及び、前記位相変調器に接続された出力、を有する遅延回路を更に備える、請求項1に記載の送信器。
- 前記レーザが、外部キャビティ・半導体レーザである、請求項1に記載の送信器。
- 前記レーザの出力光信号の波長が、1530から1570nmの範囲にある、請求項1に記載の送信器。
- アナログRF信号が、1オクターブより広い帯域を持ち、複数の別個の情報運搬チャンネルを含む、請求項1に記載の送信器。
- 前記遠隔受信器において受信される光信号に影響を与える前記レーザの非線形応答を補償するために、前記レーザに結合された前記入力に印加されるアナログRF信号を変調するための予備歪回路を更に備える、請求項1に記載の送信器。
- 前記遠隔受信器において受信される光信号に存在する受信される前記レーザの光信号出力の位相変調が選択的に調整可能である、請求項4に記載の送信器。
- 前記遅延回路が、前記遠隔受信器において受信される光信号が受ける誘導ブリユアン散乱閾値を増加させるための前記トーン信号を生成するトーン生成器回路を更に備える、請求項4に記載の送信器。
- 前記遅延回路が、前記トーン信号を生成するトーン生成器回路を更に備え、前記受信される光信号中の歪を相殺するために、前記位相変調器によって前記レーザの出力に印加される補償を調整するために、前記トーン生成器回路及び調整回路が前記位相変調器に結合される、請求項9に記載の送信器。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/366,936 US7848661B2 (en) | 2005-03-15 | 2006-03-02 | Directly modulated laser optical transmission system with phase modulation |
Publications (3)
Publication Number | Publication Date |
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JP2007235925A JP2007235925A (ja) | 2007-09-13 |
JP2007235925A5 JP2007235925A5 (ja) | 2010-02-25 |
JP4668164B2 true JP4668164B2 (ja) | 2011-04-13 |
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JP2006336993A Expired - Fee Related JP4668164B2 (ja) | 2006-03-02 | 2006-12-14 | 位相変調で直接変調されたレーザ光伝送システム |
Country Status (5)
Country | Link |
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US (1) | US7848661B2 (ja) |
JP (1) | JP4668164B2 (ja) |
KR (1) | KR20070090735A (ja) |
CN (1) | CN101043273B (ja) |
TW (1) | TWI416184B (ja) |
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- 2006-12-05 TW TW095145077A patent/TWI416184B/zh not_active IP Right Cessation
- 2006-12-14 JP JP2006336993A patent/JP4668164B2/ja not_active Expired - Fee Related
- 2006-12-21 CN CN2006101705236A patent/CN101043273B/zh not_active Expired - Fee Related
- 2006-12-27 KR KR1020060135620A patent/KR20070090735A/ko not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
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TW200735550A (en) | 2007-09-16 |
CN101043273A (zh) | 2007-09-26 |
US7848661B2 (en) | 2010-12-07 |
US20060210282A1 (en) | 2006-09-21 |
KR20070090735A (ko) | 2007-09-06 |
CN101043273B (zh) | 2012-05-30 |
JP2007235925A (ja) | 2007-09-13 |
TWI416184B (zh) | 2013-11-21 |
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