With three RF drives, one of them is for built-in phase modulator. With two FC/PC fiber connectors. For 1570 - 1605nm L-band wavelength."Unqualified alpha prototype " is marked on the modulator body and test sheet, so it is not matured product. The 1st pdf link below is only for matured product. In worst case, it might not meet some of the specification, but it would be still OK for your research. Please review the photos and last pdf ink below and make decision by yourself. You can try and return if you are not satisfied, but two-way shipping fee is not refundable.General descriptionThe 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.DPMZ modulators are specifically designed to yield well-behaved and matching electro-optic amplitude and phase responses over a 20 GHz frequency range and to have enhanced extinction ratios. The DPMZ is available with either With two FC/PC fiber connectors. The last pdf link below is from different sample.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