A method for driving at least one first optical laser diode and a second optical laser diode during operation in an optical communication network, comprising the following steps: determining a laser transfer function during operation of the at least one first laser diode as a first laser transfer function, wherein the first laser transfer function corresponds to intensity of output light of the at least one first optical laser diode in relation to a current through the at least one first optical laser diode; determining a second laser transfer function during operation of the second laser diode, wherein the second laser transfer function corresponds to intensity of output light of the second optical laser diode in relation to a current through the second optical laser diode; determining a respective forward voltage (794, 793) of the at least one first laser diode and the second laser diode; providing the respective forward voltage (794, 793) to a respective input (745, 746) of a control unit; providing a control signal, as a first control signal, for driving the at least one first laser diode according to the first laser transfer function; providing a second control signal for driving the second laser diode according to the second laser transfer function, wherein at least one parameter governing the respective laser transfer function (741, 742) is derived from the respective forward voltage (794, 793), wherein the respective laser transfer function (741, 742) of the respective laser diode (710, 711) is characterized by a threshold current and a slope of a linear region beyond the threshold current of the respective laser diode (710, 711), and wherein the threshold current is derived based on the forward voltage (794, 793) of the respective laser diode (710, 711); providing a signal representing determined output power of an optical signal via a detector to the control unit, wherein the detector detects modulation applied by respective modulators (770, 771) to each injection current (778, 779) of the respective laser diode (710, 711) and determines optical output power of the optical signal, and wherein the optical signal is an optical power of emitted light at the output of a polarization beam combiner and is monitored by an optical power monitor connected to the detector; and determining a modulation index based on the signal and the modulation applied by respective modulators (770, 771), wherein the modulation index is used to derive the respective slope of the respective laser transfer function (741, 742) of each laser diode (710, 711). determining a laser transfer function during operation of the at least one first laser diode as a first laser transfer function, wherein the first laser transfer function corresponds to intensity of output light of the at least one first optical laser diode in relation to a current through the at least one first optical laser diode; determining a second laser transfer function during operation of the second laser diode, wherein the second laser transfer function corresponds to intensity of output light of the second optical laser diode in relation to a current through the second optical laser diode; determining a respective forward voltage (794, 793) of the at least one first laser diode and the second laser diode; providing the respective forward voltage (794, 793) to a respective input (745, 746) of a control unit; providing a control signal, as a first control signal, for driving the at least one first laser diode according to the first laser transfer function; providing a second control signal for driving the second laser diode according to the second laser transfer function, wherein at least one parameter governing the respective laser transfer function (741, 742) is derived from the respective forward voltage (794, 793), wherein the respective laser transfer function (741, 742) of the respective laser diode (710, 711) is characterized by a threshold current and a slope of a linear region beyond the threshold current of the respective laser diode (710, 711), and wherein the threshold current is derived based on the forward voltage (794, 793) of the respective laser diode (710, 711); providing a signal representing determined output power of an optical signal via a detector to the control unit, wherein the detector detects modulation applied by respective modulators (770, 771) to each injection current (778, 779) of the respective laser diode (710, 711) and determines optical output power of the optical signal, and wherein the optical signal is an optical power of emitted light at the output of a polarization beam combiner and is monitored by an optical power monitor connected to the detector; and determining a modulation index based on the signal and the modulation applied by respective modulators (770, 771), wherein the modulation index is used to derive the respective slope of the respective laser transfer function (741, 742) of each laser diode (710, 711).