WESTLAKE VILLAGE, Calif., 22 Jan. 2008. Inphi Corp. in Westlake Village, Calif., is introducing the 2514DZ 25-gigabit-per-second differential Mach-Zehnder modulator driver.
This product delivers large differential output voltage and high data rates for next-generation 40G differential Quadrature Phase Shift Keying (DQPSK) and 100G optical communications applications.
The 2514DZ, with a differential output voltage of as much as 8.0 volts peak to peak (Vpp) and data rates greater than 25 gigabits per second, works seamlessly with leading differential Mach Zehnder modulators from Fujitsu and Sumitomo Osaka Cement Co. (SOCC).
As the transmission line rate increases from 10 to 40 gigabits per second, significant fiber impairments limit how far the signal can be transmitted before regeneration. For standard non-return-to-zero (NRZ) transmission method, these impairments limit the transmission distance to a few kilometers. DQPSK is emerging as one of the most powerful transmission methods for 40G applications.
Unlike the NRZ transmission method that transmits one bit of data per symbol, DQPSK encodes two bits of data per symbol, which effectively cuts the transmission line rate in half. Thus 40G DQPSK systems are less sensitive to fiber impairments than other transmission methods at the native 40-gigabit-per-second line rate and can transmit 40 gigabits per second data well over 1,000 kilometers.
Future 100-gigabit-per-second systems may rely on even more sophisticated coding schemes to encode 4 bits of data per symbol so that 100-gigabit-per-second data can be transmitted at a line rate of approximately 25 gigabits per second.
For more information contact Inphi Corp. online at www.inphi-corp.com.