Title:
COMPLETE LIGHT SWITCH
Document Type and Number:
WIPO Patent Application WO/2005/019922
Kind Code:
A1
Abstract:
A Mach-Zehnder type optical circuit includes a 3 dB coupler (10) for distributing an NRZ signal (53) inputted to an input port (7) to both arms, a 3 dB coupler (3) for distributing CW light (52) inputted to an input port (8) to the both arms, and a 3 dB coupler (4) for combining the lights which have passed through the both arms. Each of the two arms of the Mach-Zehnder type optical circuit has non-linear waveguide elements (1, 2) for non-lineally shifting the phase of the CW light which has been inputted with non-linear change of a refraction index and variable attenuators (12, 13) for attenuating the NRZ signal light inputted to the non-linear waveguide element (2) more than the NRZ signal inputted to the non-linear waveguide element (1). Furthermore, there is provided a variable delay circuit (11) for inputting the NRZ signal light to the non-linear waveguide element (2) after the NRZ signal is inputted to the non-linear waveguide element (1). The input delay time of the NRZ signal light obtained by the variable delay circuit (11) is set shorter than a mitigation time of the non-linear change of refraction index in the non-linear waveguide elements (1, 2).
Inventors:
NAKAMURA SHIGERU (JP)
Application Number:
PCT/JP2004/011597
Publication Date:
March 03, 2005
Filing Date:
August 12, 2004
Export Citation:
Assignee:
NEC CORP (JP)
NAKAMURA SHIGERU (JP)
NAKAMURA SHIGERU (JP)
International Classes:
G02F1/35; G02F1/365; G02F2/00; G02F2/02; (IPC1-7): G02F2/02; G02F1/365
Foreign References:
| JP2003506726A | 2003-02-18 | |||
| JP2003057695A | 2003-02-26 |
Other References:
NAKAMURA, S.: "Shinki Dosa Joken o Donyu shita Taisho Mach-Zender-gata Switch ni yoru Bit Rate Muizon NRZ Zenhikarihacho Henkan to Sono Shutsuryoku Hikari Denso Tokusei", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, vol. 104, no. 80, 27 May 2004 (2004-05-27), pages 5 - 10, XP002985780
Attorney, Agent or Firm:
Fujimaki, Masanori (Fukoku Seimei Building 2-2, Uchisaiwaicho 2-chom, Chiyoda-ku Tokyo 11, JP)
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