Dual Parallel Mach-Zehnder (DPMZ) Modulator

The dual parallel Mach-Zehnder (DPMZ) modulator is ideally suited for use in metro, long-haul (LH) and ultra long-haul (ULH) optical transport applications. It is used for spectrally efficient multisymbol transmission based on differential quadrature phase shift keying (DQPSK) modulation. The DPMZ modulator is comprised of two matched, high-speed Mach-Zehnder (MZ) modulators that are monolithically integrated, in parallel, inside an MZ superstructure. The MZ superstructure also functions as a phase (shifter) modulator.

KEY FEATUREs 
• Monolithically integrated, parallel, high-speed MZ
   modulators, with a phase modulator superstructure
• High-speed MZ modulators with matching amplitude and
   phase response
• High electro-optic bandwidth
• Compatible with full band tunable lasers
• Integrated RF power monitors for precision control
• Single-sided electrical I/O

APPLICATIONs
• 40 Gbps metro, regional and LH
   optical networks
• 10 Gbps ULH optical networks
• Spectrally efficient DQPSK modulation