Mar 7 2011
Mitsubishi Electric, manufacturer of electric and electronic products, has produced a fully monolithically integrated laser diode for transmission products that sends huge data at 43 Gbps. This technique is known as Return to Zero Differential Quadrature Phase Shift Keying (RZ-DQPSK).
The laser diode features three functional chips such as a DQPSK Mach-Zehnder modulator, an RZ Mach-Zehnder modulator and a tunable laser array and attains tuning control across 95 channels at 40 nm wavelength. This standard meets the specifications set by the 50-GHz ITU-T.
The chips measure 9.6x0.75 mm, which is less than 1/100th of the size of traditional chips. In addition, the device as well as the chip can be reduced to one-third of the size of the standard devices. The laser diode allows wavelength control for high bit rate and long distance transmission.
Mitsubishi Electric intends to create a light source for the C-band between 1530 to 1570 nm and also plans to boost the performance of clear optical waveforms in the future. The company will display the laser diode at the Optical Fiber Communication Conference 2011, which will be held in Los Angeles, California from 6 to 10 March 2011.