摘要:
A monolithic Receiver Optical Sub-Assembly (ROSA) device is provided and a method for producing the device. The device comprises: at least one antenna configured to receive optical signals; at least one rectifier configured to rectify electrical signals being electrical representation of the received optical signals and having frequencies within an optical band range; and at least one amplifier, coupled to the rectifier and configured to amplify rectified electrical signals; and wherein the ROSA is also characterized in being a single monolithic device.
摘要:
An optical receiver circuit is disclosed. This receiver included in receiver optical sub-assembly (ROSA) adjusts bandwidth based on a voltage level detection at a receiver signal strength indication (RSSI) pin, or rate-adaptively adjusts the bandwidth of optical receiver circuit based on operation data rate.
摘要:
An optical receiver is formed to include a digitally-controlled preamplifier that is used to adjust the bandwidth of the receiver. A measured bandwidth of the receiver is compared to a desired bandwidth and a digital control signal (such as a voltage, current, or any other appropriate parameter) supplied to the preamplifier is thereafter adjusted (either increased or decreased) to increase/decrease the bandwidth of the receiver to the desired value. A voltage regulator and potentiometer may be used as the digital controller and coupled to the input voltage supply of the preamplifier to provide the needed adjustment in voltage.
摘要:
Récepteur de signaux optiques destiné à fonctionner avec une très large bande passante, pouvant aller de quelques kilohertz à 3db à 1 gigahertz à 3db, et même au-delà. Il comporte un étage d'entrée (Q1, Q2), un amplificateur (Q3 à Q6), un étage de sortie Q7, et une résistance de contre-réaction (R26) de l'ordre de 1 à quelques kilohms. Pour obtenir un gain d'amplification élevé, on augmente la résistance de charge (R8) de l'étage d'entrée jusqu'à créer un pôle, dans la bande, et l'on compense ce pôle immédiatement après par une liaison (R10, C6)entre le premier étage (Q3) et le second étage (Q4) de l'amplificateur.
摘要:
A monolithic Receiver Optical Sub-Assembly (ROSA) device is provided and a method for producing the device. The device comprises: at least one antenna configured to receive optical signals; at least one rectifier configured to rectify electrical signals being electrical representation of the received optical signals and having frequencies within an optical band range; and at least one amplifier, coupled to the rectifier and configured to amplify rectified electrical signals; and wherein the ROSA is also characterized in being a single monolithic device.
摘要:
A monolithic Receiver Optical Sub-Assembly (ROSA) device is provided and a method for producing the device. The device comprises: at least one antenna configured to receive optical signals; at least one rectifier configured to rectify electrical signals being electrical representation of the received optical signals and having frequencies within an optical band range; and at least one amplifier, coupled to the rectifier and configured to amplify rectified electrical signals; and wherein the ROSA is also characterized in being a single monolithic device.
摘要:
A transimpedance pre-amplifier circuit is arranged to have a complex pole response resulting from the interaction of the open-loop pole with the pole associated with a circuit feedback. The pre-amplifier circuit includes a transistor (Q1) with a load capacitor (C1) connected in the transistor output circuit to determine the open loop pole. The feedback includes a resistive element (F). The first stage of the pre-amplifier comprising the transistor (Q1) may be followed by one or more further amplifying stages (A1, A2). The feedback to the input of the first stage may be from the output of one of the further stages. A receiver incorporating the pre-amplifier circuit (14) includes only post-amplifiers (10,12) connectd to receive the output of the pre-amplifier (14). The response of the pre-amplifier makes it unnecessary to include a dedicated passive filter in the receiver and the post-amplifiers (10,12) can have smaller bandwidths than in conventional receivers. This makes the receiver particularly useful for use at high frequencies, for example, of the order of 1.6 GHz.