Optical Modulator Driver Solutions 28 Gbps EML and 32 Gbps MZ Drivers
By Hittite Microwave
Hittite has added three new products to its optical modulator driver family, HMC1068, HMC1069 and HMC7150LP3DE, addressing the stringent lower power and higher density requirements of the next generation long-haul, metro core and metro access fiber optic equipments.
HMC7150LP3DE is an EML (Electro-absorption Modulated Laser ) driver, designed for 100G Ethernet LR4 and ER4 applications. The device supports data-rates up to 28.3 Gbps and its high bandwidth yields output signal characteristics of 12 p-sec rise & fall times.
HMC7150LP3DE is ideal for CFP2/CFP4 and QSFP2, or similar form factor pluggable modules, with its compact size and low power consumption. HMC7150LP3DE is available in 3x3 mm plastic LP3 RoHS compliant SMT package. HMC7150LP3DE runs on positive supply, from 3.3V to 6V. The wide supply operating range enables module designers to lower the power consumption of their modules by selecting the optimum supply voltage based on their EML characteristics.
This device has 50 Ohm matched inputs and outputs and must be used in AC-coupled configuration. The optimum bias condition for the device is set with external bias voltages. The output signal cross-point and amplitude are adjustable via device control pins. Evaluation boards and reference designs are available upon request.
HMC1068 and HMC1069 are optical modulator drivers in die form and they are perfect for driver integrated transmitter optical sub-assembly modules for 100G systems. Both parts support data rates up to 32 Gbps with excellent time domain performance, and the small size, low power consumption ensures the designers meet their power budgets in highly integrated designs. HMC1068 can deliver up to 3 Vp-p output voltage swing without the need for an external bias-tee and they are perfect for Electro-Absorption (EA) type modulators. HMC1069 can deliver higher voltage up to 8 Vp-p output swings and is designed to meet the electrical characteristics of the Mach-Zender (MZ) type optical modulators.
HMC1069 is biased through an external bias-tee at its RF output. Both drivers have 14 to 15 dB gain and depending on the application they can be used as single stage or in cascade configuration for higher gain. HMC1068 and HMC1069 support wide supply voltage range, that gives the designers the advantage and the flexibility to optimize and lower the power consumption of their system for different optical modulators. These three parts have 50 Ohm matched inputs/outputs and must be used AC-coupled. The peak-detector feature is incorporated in all devices which can be used for monitoring the output voltage swing level during the normal operation. As fiber-optic systems move into smaller sizes, higher levels of integration of the building blocks is needed. HMC1068 and HMC1069 die products address the next generation optical modulator designs, where the drivers are integrated in the same module assembly with the optical modulator. Samples and application notes are available upon request.
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