Finisar Corporation

Infineon Technologies Ag

Toralf Oheim

Karl Schrödinger

Karl Schr&ouml;dinger

The invention is directed to a laser diode assembly having a laser diode and a support, whereon the laser diode is arranged or formed in one single piece. The laser diode assembly further includes a coupling capacitor integral therewith, wherein the laser diode is subjected to the action of a laser driver circuit via the coupling capacitor associated with the assembly. The invention is also directed to a device for operating a laser diode, wherein the device includes a coupling capacitor integral with a laser diode assembly. The invention enables a reduction in the number of coupling paths between a laser driver circuit and a laser diode assembly, thereby reducing the occurrence of parasitic elements.

Laser diode assembly and device for operating a laser diode

The invention relates to an integrated circuit for controlling a laser diode, comprising a signal input for receiving a data signal; a signal output for connection to the laser diode; a modulator for modulation of the data signal; a current infeed connected to the signal output for the supply of a bias current; a coupling capacitor between the output of the modulator and the signal output in order to form a high pass with the differential resistor of the laser diode. Preferably, the circuit also comprises an active compensation circuit with a low pass connected to the output of the modulator; and a circuit which is connected to the low pass for producing a signal which is inversely proportional to the low pass output voltage and which is added to the output signal or subtracted from the output signal. The low pass can be controlled by a circuit guiding the data signal.

Integrated circuit for controlling a laser diode

A device for adjusting laser diodes includes a pilot signal adjustment device for adjusting the signal current using a pilot signal frequency that is modulated onto the signal current. The device includes a bias direct current source supplying the laser diode with a bias direct current. A switching device switches the adjustment device between a state where the pilot signal adjustment device is connected to the modulator and the bias direct current source such that the signal current can be adjusted using the pilot signal adjustment device, and another state where the modulator is connected to the temperature compensation device such that the signal flow can be adjusted and/or controlled by the temperature compensation device.

Growing community of inventors

Hennigsdorf, Germany

Toralf Oheim