Abstract: The invention relates to a method of extending the capture range (CR) of a wavelength monitor for the lasers of a wavelength division multiplex (WDM) transmission system wherein the capture range (CR) comprises one wavelength period (FSR) of a periodic error signal (E) generated with the aid of the wavelength filter (4), the capture range contains a desired wavelength (?0) of a plurality of equidistant wavelengths (?i, ?i+1, ?i+2, . . . ), each of the lasers of the WDM transmission system is set at a desired wavelength (?0) by comparing the error signal (E) with an comparison value (C1 or C2), that is unique in the capture range (CR) for a chosen slope sign, the wavelength period (FSR) of the error signal (E) is set such that it corresponds to double the wavelength spacing (A) of two adjacent wavelengths of the WDM transmission system and the desired wavelength (?0) is set taking into account the slope sign of the error signal (E), and further relates to a wavelength monitor and laser system therefor.

Abstract: The invention is related to an optical device having a housing (1) with a defined gas atmosphere. The housing includes a wavelength monitor, for monitoring an optical signal The wavelength monitor includes an etalon (2) with a gap between two etalon plates. The optical device also has a laser diode and means for influencing the temperature (3) of the laser diode. The optical device further includes special means to influence the gas density in the gap between the etalon plates.

Abstract: The invention is related to a wavelength stabilization monitor (1): with a laser source (7), two photodiodes (10, 11) in different light paths, and a wavelength filter (9), with a collimating element (8) and at least the collimating element (8) that can be moved in relation to the laser source (7).

Abstract: A method of stabilizing the wavelength of lasers comprising a control circuit is proposed, wherein the light of the laser passes through a splitter and the split light passes through a wavelength filter in a first branch, and the light of both branches is in each case received by a photodetector. The photodetector of the first branch can be operated with different gain factors. The wavelength filter has a free spectral region which is greater than the spacing between the individual wavelengths in a wavelength division multiplex.

Abstract: The invention is related to an optical device comprising, in an housing (1) with a defined gas atmosphere:

Abstract: The invention is related to a wavelength stabilization monitor (1): with a laser source (7), two photodiodes (10, 11) in different light paths, and a wavelength filter (9), with a collimating element (8) and at least the collimating element (8) that can be moved in relation to the laser source (7).

Abstract: The invention relates to a method of extending the capture range (CR) of a wavelength monitor for the lasers of a wavelength division multiplex (WDM) transmission system wherein the capture range (CR) comprises one wavelength period (FSR) of a periodic error signal (E) generated with the aid of the wavelength filter (4), the capture range contains a desired wavelength (&lgr;0) of a plurality of equidistant wavelengths (&lgr;i, &lgr;i+1, &lgr;i+2, . . .

Abstract: A method of stabilizing the wavelength of lasers comprising a control circuit is proposed, wherein the light of the laser passes through a splitter and the split light passes through a wavelength filter in a first branch, and the light of both branches is in each case received by a photodetector. The photodetector of the first branch can be operated with different gain factors. The wavelength filter has a free spectral region which is greater than the spacing between the individual wavelengths in a wavelength division multiplex.