A packaged optical receiver, comprising: a photodiode configured to receive an optical signal; a transimpedance amplifier (TIA) coupled to the photodiode; and a signal pin; wherein the optical receiver is configured to receive, via the signal pin, a reset signal; and wherein the optical receiver is configured to output in response to the reset signal, via the signal pin, a received signal strength indication (RSSI) for the received optical signal.

A rate negotiation method is provided. A first device switches a fiber transmission rate of a first port of the first device to a first fiber transmission rate based on a preset switching direction within a rotation period of a first fiber transmission rate set. The first device sends a negotiation packet to a second device through the first port of the first device within a duration of the first fiber transmission rate. If a response packet is received from the second device through the first port of the first device within the duration of the first fiber transmission rate, the first port of the first device is controlled to communicate with the second device based on the first fiber transmission rate.

A free-space optical (FSO) communication system includes a transmitter including a modulated light source and transmit optics for emitting a modulated optical signal into a FS channel toward a receiver. A receiver is coupled to receive the modulated optical signal including receive optics coupled to a few-mode (FM) pre-amplifier that is coupled to a demodulator.

An optical communications system includes a modulator/demodulator (modem) to transmit outgoing communications data and to receive incoming communications data in a transceiver. A main detector is coupled to the modem to convert an optical signal representing the incoming communications data to an electrical signal for the modem. An adaptive data rate processor monitors the electrical signal from the main detector to determine a current power level for the optical signal. The adaptive data rate processor dynamically adjusts a data rate of the modem based on the determined current power level of the optical signal.

A method for allocating bandwidth to a first ONU, a second ONU, M.sub.1 ONUs, and M.sub.2 ONUs includes, during an allocation cycle, (i) granting a respective upstream time slot to, of a plurality of N ONUs, only each of the M.sub.1 ONUs, and (ii) granting a first upstream time slot to the first ONU. Each of the M.sub.1 ONUs and M.sub.2 ONUs is one of the plurality of N ONUs. The method also includes, during a subsequent cycle, (i) granting a respective upstream time slot to, of the plurality of N ONUs, only each of the M.sub.2 ONUs. The N ONUs includes a skipped-ONU that is one of either, and not both, the M.sub.1 ONUs and the M.sub.2 ONUs. The method includes, during the subsequent allocation cycle, granting a second upstream time slot to a second ONU, which is not one of the plurality of N ONUs.

An optical communications system includes a modulator/demodulator (modem) to transmit outgoing communications data and to receive incoming communications data in a transceiver. A main detector is coupled to the modem to convert an optical signal representing the incoming communications data to an electrical signal for the modem. An adaptive data rate processor monitors the electrical signal from the main detector to determine a current power level for the optical signal. The adaptive data rate processor dynamically adjusts a data rate of the modem based on the determined current power level of the optical signal.

A packaged optical receiver, comprising: a photodiode configured to receive an optical signal; a transimpedance amplifier (TIA) coupled to the photodiode; and a signal pin; wherein the optical receiver is configured to receive, via the signal pin, a reset signal; and wherein the optical receiver is configured to output in response to the reset signal, via the signal pin, a received signal strength indication (RSSI) for the received optical signal.

A method for allocating bandwidth to a first ONU, a second ONU, M.sub.1 ONUs, and M.sub.2 ONUs includes, during an allocation cycle, (i) granting a respective upstream time slot to, of a plurality of N ONUs, only each of the M.sub.1 ONUs, and (ii) granting a first upstream time slot to the first ONU. Each of the M.sub.1 ONUs and M.sub.2 ONUs is one of the plurality of N ONUs. The method also includes, during a subsequent cycle, (i) granting a respective upstream time slot to, of the plurality of N ONUs, only each of the M.sub.2 ONUs. The N ONUs includes a skipped-ONU that is one of either, and not both, the M.sub.1 ONUs and the M.sub.2 ONUs. The method includes, during the subsequent allocation cycle, granting a second upstream time slot to a second ONU, which is not one of the plurality of N ONUs.

A trans-impedance amplifier arrangement has an input configured to receive an output from a photo-detector, a current monitoring circuit configured in use to provide a current monitor signal dependent on a current through the photo-detector, and an output configured to output said current monitor signal to a control module, said output further configured to receive control information from said control module. A control module is configured to receive the current monitor signal and to provide the control information.

An optical communication system, a linear optical receiver, and an Integrated Circuit (IC) chip are disclosed, among other things. One example of the disclosed IC chip includes a transimpedance amplifier that receives an input electrical signal from a photodiode and provides an amplified version of the input electrical signal as an output, at least one variable gain amplifier that receives the amplified electrical signal output by the transimpedance amplifier and a bandwidth control mechanism that extends a bandwidth of the second amplified output at a maximum gain of the second amplification phase and also reduces a peaking of the second amplified output at a minimum gain of the second amplification phase.