LONDON Optical component group Bookham, Inc. is demonstrating at this week's OFC in San Diego a tiny, 5mm 40Gbits/s Optical Differential Quadrature Phase Shift Keying (ODQPSK) modulator chip.
Implemented in proprietary indium phosphide Mach Zehnder (InP MZ) technology that is produced at Bookham's 3 inch wafer fab in Caswell, England, the company plans to combine this functionality with its tunable laser in devices targeted at the 40G market.
The company says the reduced size InP MZ platform would allow it to offer 40Gbit/s products in smaller footprints compared to existing parts on the market or being developed.
"The capability to offer high bit rate performance with our fully qualified, proven tunable laser and InP MZ modulator is crucial as vendors continue to evolve towards 40Gb/s networks," said PLM Director, Adam Price. "40Gbit/s roll out is still hampered by prohibitive pricing as we see 40Gbit/s systems costing in excess of 10 times a 10Gbit/s system."
Price adds the InP MZ platform has the flexibility to implement a range of modulation schemes at high data rates, "but it is our vision that ODQPSK, in which we have significant Intellectual Property, is the modulation format to allow the correct price positioning at 40Gbit/s, and the scalability to 100Gitb/s. ODQPSK also allows 40Gbit/s to be deployed on to a 50GHz grid, and demonstrates higher resilience to polarization mode dispersion."