Title:
基準高周波信号発生方法および基準高周波信号発生装置
Document Type and Number:
Japanese Patent JP4047224
Kind Code:
B2
Abstract:
With a single laser light source, the line width of a beat signal is set to a few tens of kHz or less without it fluctuating over time, and the frequency thereof is set as desired. CW light from a CW laser light source (16) is input into an electroabsorption modulator (17) to which a sine wave electrical signal is applied. A modulation sideband which is made up from line spectra at separations equal to the modulation frequency is generated from the electroabsorption modulator (17). An optical fiber (19) for higher-order soliton compression broadens the optical spectrum width, and increases the number of line spectra. A tunable wavelength filtering device which is made up from optical fiber gratings (20-1, 20-2) and optical circulators (21-1, 21-2) chooses two of the line spectra, which are combined by an optical coupler (11-2), with their beat signal being heterodyne wave detected by a photo-detector (12).
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Inventors:
Takashi Yamamoto
Satoru Kawanishi
Satoru Kawanishi
Application Number:
JP2003146263A
Publication Date:
February 13, 2008
Filing Date:
May 23, 2003
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G02F2/00
Domestic Patent References:
| JP10246873A | ||||
| JP2000249993A | ||||
| JP2001264830A |
Other References:
O.P. Gough et al.,Exact millimetre wave frequency synthesis by injection locked laser comb line selection,IEEE International Topical Meeting on Microwave Photonics,1999年,W-4.3,pp.61-64
興梠元伸、大津元一,広スパン光周波数コムの発生と応用,応用物理,1998年,第67巻、第5号,551-554頁
川西悟基,マイクロ波フォトニクスの電波天文への応用,電子情報通信学会大会講演論文集,2001年 3月 7日,通信2,784-785頁
興梠元伸、大津元一,広スパン光周波数コムの発生と応用,応用物理,1998年,第67巻、第5号,551-554頁
川西悟基,マイクロ波フォトニクスの電波天文への応用,電子情報通信学会大会講演論文集,2001年 3月 7日,通信2,784-785頁
Attorney, Agent or Firm:
Masatake Shiga
Yasuhiko Murayama
Yasuhiko Murayama