10Gbps EAM Driver with Integrated Bias Network
10.7Gbps Electro-Absorption Modulator (EAM) Driver with Integrated Modulation and Biasing Functions
DescriptionThe MAX3940 is designed to drive an electro-absorption modulator (EAM) at data rates up to 10.7Gbps. It incorporates the functions of a biasing circuit and a modulation circuit, with integrated control op amps externally programmed by DC voltages.
The integrated bias circuit provides a programmable biasing current up to 50mA. This bias current reflects a bias voltage of up to 1.25V on an external 50Ω load. The bias and modulation circuits are internally connected on chip, eliminating the need for an external bias inductor.
A high-bandwidth, fully differential signal path is internally implemented to minimize jitter accumulation. When a clock signal is available, the integrated data-retiming function can be selected to reject input-signal jitter.
The MAX3940 receives differential CML signals (ground referenced) with on-chip line terminations of 50Ω. The output has a 50Ω resistor for back termination and is able to deliver a modulation current of 40mAP-P to 120mAP-P, with an edge speed of 23ps (typical, 20% to 80%). This modulation current reflects an EAM modulation voltage of 1.0VP-P to 3.0VP-P.
The MAX3940 also includes an adjustable pulse-width control circuit to precompensate for asymmetrical EAM characteristics.
- On-Chip Bias Network
- 23ps Edge Speed
- Programmable Modulation Voltage Up to 3VP-P
- Programmable EAM Biasing Voltage Up to 1.25V
- Selectable Data-Retiming Latch
- Up to 10.7Gbps Operation
- Integrated Modulation and Biasing Functions
- 50Ω On-Chip Input and Output Terminations
- Pulse-Width Adjustment
- Enable and Polarity Controls
- ESD Protection
- 10Gbps Ethernet
- DWDM Systems
- Long/Short-Reach Optical Transmitters
- SONET/OC-192 and SDH/STM-64 Transmission Systems
Technical DocumentsApp Note 1816 HFAN-02.0.2: Laser Diode to Single-Mode Fiber Coupling Efficiency: Part 1 - Butt Coupling
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|