Abstract:
A flexible circuit used in connecting driver circuitry with an optical assembly of a transceiver. The flexible circuit includes one or more first transmission lines that enable modulated signals to be delivered from the driver circuitry to the optical assembly. Electrically connected to the one or more first transmission lines are one or more second transmission lines that connect a bias current source to the optical assembly. By connecting the second transmission lines to the first transmission lines at a distal end of the first transmission lines, the flexible circuit assists in reducing the voltage needed to operate the optical assembly of the transceiver and reduces the bias voltage used to bias the modulated signals.
Abstract:
An optoelectronic assembly includes a circuit board having a set of signal traces, where one or more of the signal traces has a junction point that integrates a pad of a circuit element. Exemplary circuit elements include a resistor, capacitor, and an inductor. The junction point has a first width and a first thickness, and the one or more signal traces have a second width and a second thickness. The dimensions of the junction point and the dimensions of the one or more signal traces are configured such that the first width and the second width are substantially similar, and that the first thickness and the second thickness are substantially similar. In one embodiment, the first width is no greater than 125% of the second width.
Abstract:
An optical transmitter and/or a constituent electro-optic transducer driver that performs active matching. The transducer driver performs active matching using a voltage step down through one base-emitter bipolar transistor, followed by a step up approach through the base-emitter of another bipolar transistor, thereby allowing for lower supply voltages. Furthermore, the voltage drop across the source resistor is minimal by using an operation amplifier in a feedback configuration, thereby further encouraging operability with low supply voltages. The electro-optic transducer driver is also beneficial in that it has high AC-coupling efficiency of the modulation current to the electro-optic transducer, may operate at high speeds with reduced jitter.