Abstract: A method and apparatus for use in an optical receiver are provided for monitoring the received optical power in the optical receiver over wide range of optical power levels with high accuracy. An adjustable resistor circuit of the apparatus has a first resistor and one or more second resistors that may be switched into and out of parallel with the first resistor to vary the resistance of the adjustable resistor circuit. A controller of the optical receiver controls the switching of the one or more second resistors into and out of parallel with the first resistor. Varying the resistance of the adjustable resistor circuit in this manner causes the value of the analog voltage signal representing the received optical power to be varied prior to being input to the ADC of the controller. In this way, the amplitude of the analog voltage signal is reduced when it is at the high end of the received power range so as not to exceed the input range of the ADC of the controller IC.

Abstract: A method and apparatus for use in an optical receiver are provided for monitoring the received optical power in the optical receiver over wide range of optical power levels with high accuracy. An adjustable resistor circuit of the apparatus has a first resistor and one or more second resistors that may be switched into and out of parallel with the first resistor to vary the resistance of the adjustable resistor circuit. A controller of the optical receiver controls the switching of the one or more second resistors into and out of parallel with the first resistor. Varying the resistance of the adjustable resistor circuit in this manner causes the value of the analog voltage signal representing the received optical power to be varied prior to being input to the ADC of the controller. In this way, the amplitude of the analog voltage signal is reduced when it is at the high end of the received power range so as not to exceed the input range of the ADC of the controller IC.

Abstract: An arrangement for connecting an electronic subassembly and an optical subassembly in an electro-optical communication device such as an electro-optical transceiver. The arrangement includes a body of a rigid dielectric material for mounting e.g. on the optical subassembly. The body has electrically conductive pathways provided thereon and includes a shaped portion providing a socket-like formation. At least one electrical contact element is coupled with e.g. the electronic subassembly. The electrical contact element is pluggable into the socket-like formation of the body of rigid dielectric material and includes an elastic device adapted to elastically co-operate with the socket-like formation of the body of rigid dielectric material to retain the electrical contact element plugged in the socket-like formation to provide electrical contact with the electrically conductive pathways provide thereon, while permitting vibrational displacement of the electrical contact element within the socket-like formation.

Abstract: The power of a digital signal such as an optical data stream is set via digital-to-analog converter having a reference input for connection to a DC reference signal. The pilot tone is injected into the reference input of the digital-to-analog converter. In the place of a dual amplitude control (modulation current and pilot tone), the disclosed arrangement only requires a single control, thereby reducing cost, power consumption, microcontroller input/output activity, area occupation (PCB real estate) and failure rate.

Abstract: An arrangement for connecting an electronic subassembly and an optical subassembly in an electro-optical communication device such as an electro-optical transceiver. The arrangement includes a body of a rigid dielectric material for mounting e.g. on the optical subassembly. The body has electrically conductive pathways provided thereon and includes a shaped portion providing a socket-like formation. At least one electrical contact element is coupled with e.g. the electronic subassembly. The electrical contact element is pluggable into the socket-like formation of the body of rigid dielectric material and includes an elastic device adapted to elastically co-operate with the socket-like formation of the body of rigid dielectric material to retain the electrical contact element plugged in the socket-like formation to provide electrical contact with the electrically conductive pathways provide thereon, while permitting vibrational displacement of the electrical contact element within the socket-like formation.

Abstract: A load responds to a voltage-to-current converter including a differential amplifier. A sensing resistor is series connected with the load and first and second feedback resistors, respectively included in first and second voltage dividers having taps connected to non-inverting and inverting inputs of the amplifier. One divider is connected between a first terminal of the sensor resistor and one voltage responsive input terminal of the converter. Another divider is connected between the second terminal of the sensor resistor and a second converter input terminal, that can be grounded or voltage responsive. The feedback resistors have the same value that is much greater than the sensor resistor value. The first divider can be connected to the first or second terminal of the sensor resistor and vice versa for the second divider.

Abstract: A load responds to a voltage-to-current converter including a differential amplifier. A sensing resistor is series connected with the load and first and second feedback resistors, respectively included in first and second voltage dividers having taps connected to non-inverting and inverting inputs of the amplifier. One divider is connected between a first terminal of the sensor resistor and one voltage responsive input terminal of the converter. Another divider is connected between the second terminal of the sensor resistor and a second converter input terminal, that can be grounded or voltage responsive. The feedback resistors have the same value that is much greater than the sensor resistor value. The first divider can be connected to the first or second terminal of the sensor resistor and vice versa for the second divider.

Abstract: The power of a digital signal such as an optical data stream is set via digital-to-analog converter (12) having a reference input (12a) for connection to a DC reference signal (14). The pilot tone is injected into the reference input (12a) of the digital-to-analog converter. In the place of a dual amplitude control (modulation current and pilot tone), the arrangement of the invention only requires a single control, thereby reducing cost, power consumption, microcontroller input/output activity, area occupation (PCB real estate) and failure rate.