FB01GKAR 650 nm 1 Gbps 40 m OptoLock® POF Transceiver

The KD1053 PHY IC is required for 1 Gbps operation, and it also supports the 100 Mbps mode. Gigabit transmission relies on the prescribed multilevel encoded signal used for IEEE 802.3-bv over POF, so the transceiver should not be paired with an arbitrary Ethernet PHY. The 100 Mbps mode follows IEEE 802.3 Ethernet while retaining the same optical transceiver assembly. TD+ and TD− feed the transmitter, while RD+ and RD− carry the receiver output, and these differential paths require controlled-impedance routing. In practice, the PHY, transceiver, PCB layout and selected operating mode should be validated as one complete link.

The specified design targets are up to 40 m at 1 Gbps and up to 100 m at 100 Mbps over step-index POF. The optical interface is intended for 2.2 mm jacketed cable, with optical characterisation based on 1 mm core, 0.5 NA POF. Transmitter power testing uses 0.5 m of professionally terminated fibre, while receiver testing uses a minimum fibre length of 1 m. Actual maximum distance can change with the data rate, fibre condition, bend routing, termination quality and installation environment. Link-budget and system testing should therefore be completed using the intended production cable and termination process.

The transceiver should be powered from 3.3 V, with an operating range of 3.13 to 3.47 V. Transmitter current is 61 to 75.5 mA and receiver current is 25.5 to 46 mA, so their maximum values sum to 121.5 mA before allowing for the PHY and design margin. The supply should be isolated with a ferrite bead rated at 600 Ω at 100 MHz and below 200 mΩ DCR, with local power capacitors placed close to the DC pins. EMI shield pins 1 and 12 must connect to the signal-ground plane, while transmitter ground pins 2 and 3 need a full ground plane for heat transfer. Keep the device away from hot components, provide enclosure airflow and ensure that the EMI shield remains below 85 °C.

The RSSI output represents the average optical power reaching the receiver and can be used to monitor link condition. Its typical responsivity is 0.52 A/W, with a maximum output current of 300 µA and a compliance range of 0.3 to 2.7 V. The receiver enters sleep at an average optical power of -36 dBm and wakes when the level reaches -30 dBm. These thresholds create 6 dB of optical hysteresis, while the typical output wake-up time is 24 µs after the wake threshold is crossed. This allows the controller or PHY to distinguish between an inactive optical path and a signal level suitable for restoring receiver operation.

The PCB should treat TD+/TD− and RD+/RD− as high-speed differential paths and route them with consistent impedance and minimal discontinuities. Each transmitter input has a typical single-ended impedance of 50 Ω, with limits of 46 to 54 Ω, and a typical input capacitance of 2.33 pF. The receiver presents a 100 Ω differential output impedance and a differential swing between 190 and 323 mV peak-to-peak. Its common-mode output voltage ranges from 0.6 to 1.12 V, with a typical value of 0.96 V. These characteristics should be checked against the PHY input requirements, PCB stack-up and termination strategy before layout approval.

The transceiver is not suitable for infrared or vapour-phase reflow soldering, so it requires a compatible lead-soldering process. The absolute soldering limit is 260 °C for 10 seconds on one occasion, with the heat applied at least 2.2 mm from the lead root. It is classified as MSL 2a under J-STD-020, providing a floor life of 672 hours, or four weeks, below 30 °C and 60% relative humidity after the bag is opened. An unopened moisture-barrier bag has a stated shelf life of 24 months below 40 °C and 90% relative humidity. Assembly should use static-control procedures, non-halogenated water-soluble flux and compatible alcohol-based cleaning agents, with the dust plug kept in place during soldering, washing and drying.

The 650 nm designation describes the visible-red RCLED technology used by the product, while the electrical and optical characteristics give a typical measured peak wavelength of 660 nm. The stated spectral bandwidth is 23 nm typical and 30 nm maximum, so the emitted energy occupies a wavelength range rather than a single exact line. Average optical output power is specified from -5 to -1.5 dBm, with a typical value of -2.5 dBm under the defined fibre-coupling conditions. The emitter is classified as LED Class 1 in accordance with IEC 60825-1. Optical power-budget calculations should use the specified power and wavelength characteristics rather than assuming that the emission peak is fixed at exactly 650 nm.