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[1] Differential Quadrature Phase Shift Keying (DQPSK)
A modulation method for digital signals whereby 2 bits of data are allocated to each of four modulated optical phases. The use of four types of optical phases enables a pulse width that is double that of the binary modulation scheme, reducing the effect of waveform distortion due to PMD.
[2] Polarization Mode Dispersion (PMD)
Phenomenon in which light travels at different speeds in the two polarization modes of an optical fiber causing signal distortion at the optical receiver.
[3] Binary Modulation
A modulation method whereby the digital singles "0" and "1" are assigned to either "bright" or "dark" optical signals, or to "0°" or "180°" optical phases.
[4] International Telecommunication Union - Telecommunication standardization sector (ITU-T)
An international organization that produces standards in the telecommunications field.
[5] LN Optical Modulator
A device that converts an electrical data signal into an optical data stream via the electro-optic effect of a LiNbO3 crystal. For more detailed information, please refer to the press release on March 27, 2007.
[6] InP Hetero-Junction Bipolar Transistor (InP HBT)
A compound semiconductor transistor with outstanding high-speed performance and high drive capability with low IC power consumption.
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Press Contacts
Public Relations & Investor Relations
Phone: +81-422-52-5530
Company:Yokogawa Electric Corporation
Customer Contacts
Photonics Business Headquarters
Phone: +81-42-770-6811
Company:Yokogawa Electric Corporation
Customer Contacts
Photonic Systems Group
Phone: +81-44-754-3131
E-mail: contact-photonicsinfo@cs.jp.fujitsu.com
Company:Fujitsu Limited
All company or product names mentioned herein are trademarks or registered trademarks of their respective owners. Information provided in this press release is accurate at time of publication and is subject to change without advance notice.
Date: 05 April, 2007
City: Tokyo
Company:
Yokogawa Electric Corporation,
Fujitsu Limited,
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