Moog Protokraft Gemini series media interface adapters consist of optoelectronic transmitter and receiver functions integrated into a bulkhead mounted MIL-DTL-38999, series III receptacle connector assembly. The optical transmitters are 850 nm VCSEL or 1310 nm FP lasers.
The transmitter input lines are driven with differential CML signals applied to the transmitter (TX+ and TX-) lines. Dual loop, temperature compensated, VCSEL laser drivers convert the transmitter input signals to suitable VCSEL laser bias and modulation currents. The optical receivers consist of PIN and preamplifier assemblies and limiting post-amplifiers. Outputs from the receivers consist of differential CML data signals on the receiver (RX+ and RX-) lines and single ended CMOS indicator functions on the Loss of Signal (LOS) lines. A CMOS fault signal is generated on the TX Fault line by the module controller upon any monitored internal optical or electrical fault condition. The receiver data lines are squelched upon LOS assertion, preventing errant data packet generation when an invalid incoming optical signal is presented to the transceiver. The electrical interface to the Gemini series optical transceiver adapters is a MIL-DTL-38999 series III plug connector with 66 size 22 electrical contacts.