Alcatel Cit

Alcatel

Avanex Corporation

Societe Anonyme Dite: Alcatel Cit

Daniel Mousseaux

Emmanuel Grard

Franck Le Gall

Bruno Chevet

Jacques Auge

Eugene Duda

Jean-Jacques Guerin

Jean-Luc Beylat

Fabrice Pitel

Michel Monnot

Franck Le-Gall

Gerard Gelly

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 (), the capture range contains a desired wavelength (&#x3bb;) of a plurality of equidistant wavelengths (&#x3bb;, &#x3bb;, &#x3bb;, . . . ), each of the lasers of the WDM transmission system is set at a desired wavelength (&#x3bb;) by comparing the error signal (E) with an comparison value (Cor C), 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 (&#x3bb;) is set taking into account the slope sign of the error signal (E), and further relates to a wavelength monitor and laser system therefor.

Method of extending the capture range of a wavelength monitor and a wavelength monitor and laser system therefor

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

Optical device with wavelength monitor

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

Wavelength stabilization monitor and method for adjusting the working wavelength of said monitor

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.

Method of stabilizing the wavelength of lasers and a wavelength monitor

In a method of coupling an optical fiber to an optical component on the same substrate, eccentricity of the core of a coupling fiber is exploited to adjust the vertical position of the core by rotation of the fiber about its axis. This adjustment is carried out with the fiber held in contact with a horizontal reference surface of a substrate also carrying a laser diode constituting the component to which the fiber must be coupled. The method can be used to implement transmission headers for optical fiber telecommunication systems.

Method of coupling an optical fiber to an optical component on the same

The side surface of a ferrule (16) carrying a polarization-maintaining option fiber (10) has a projecting substantially dihedral-angled portion (17, 19) engaged in a complementary re-entrant substantially dihedral angled portion (22, 24) formed in a ferrule receiver (20). The invention is particularly applicable to making a laser-emitting head for an optical fiber telecommunications network.

Device including a transversely anisotropic optical fiber, and a method

A DFB laser (2) is coupled to a monomode line fiber (14) via an isolator constituted by a Faraday rotator crystal (4) and a polarizing fiber (10) which is welded to a fiber to be coupled (14). A focusing lens (8) is integrated in an intermediate block including the rotator crystal (4) and a permanent magnet (6). The invention is particularly suitable for making light-emitting heads for use in optical fiber telecommunications systems.

Optical head with an integrated isolator for coupling a semiconductor

An opto-electronic component such as a semiconductor optical amplifier (L) is mounted on a copper base (EL) which is received in a receptacle constituted by two blocks (DA, DB) of ferrous alloy. Two other blocks (BA, BB) carry fibers to be coupled (FA, FB) and they are fixed to said receptacle by weld spots (PA, QA, PB, QB) on the edges of the faces of said blocks that are bearing against one another. The invention is particularly suitable for optical fiber telecommunications networks.

Device providing two optical couplings, in particular for an optical

An optical fiber (F) and a laser (L) are fixed on the top faces of two bases (EF, EL) which also have two facing vertical faces. A spring (4) presses these two faces against each other so as to create thrust friction. The thrust force is initially moderate in order to enable the relative vertical and transverse positions (GV, GT) of the two bases to be adjusted smoothly, after which the force is increased progressively in order to prevent relative displacement taking place while the two bases are being welded together by means of a YAG laser. The invention is particularly applicable to making optical transmission heads usable in optical fiber telecommuncations systems.

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Palaiseau, France

Daniel Mousseaux