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Samples in periodicals archive:
ZTE has used its patented technology to achieve 20 DWDM (dense wavelength division multiplexing) channels of 400Gbps single-carrier polarisation multiplexing and quadrature phase shift keying (QPSK) signals to successfully transmit to 3600km in standard single-mode fiber when the spectrum efficiency is improved to 4b/s/H.
In the TQP, thousands of competitors from around the world will endeavor to make contact with WC5C Tri-County Amateur Radio Club on various high frequency radio channels, using Morse Code, Phase Shift Keying, Voice operations, and Radio Teletype (RTTY).
The demonstration is enabled by the new 100G dual-polarization quadrature phase shift keying (DP-QPSK) aggregation transponder developed by T8 and OFS AllWave Zero Water Peak (ZWP) optical fiber.
Tokyo, Japan, June 26, 2007 - (JCN) - In April 2007, Yokogawa and Fujitsu collaborated to develop the world's first differential quadrature phase shift keying (DQPSK) technology to enable 40Gbps in optical communications.
The transmission breakthrough was made possible using the differential phase shift keying (DPSK) method, a new coding scheme for high-capacity communications developed at Bell Labs.
The former uses differential binary phase shift keying (DBPSK) and the latter uses differential quadrature phase shift keying (DQPSK).
Ultra-long distance connections of 9,000km are now possible through Nortel's recent development of a 40G Ultra Long Haul solution which employs coherent Dual Polarization Binary Phase Shift Keying (DP BPSK) technology that can more than double the distance that 40G traffic can travel.
4: QPSK -- Abbreviation for Quaternary Phase Shift Keying.