Abstract: An optical receiver is disclosed comprising an erbium-doped fiber amplifier (EDFA) that is coupled to a photodiode and transimpedance amplifier without filtering output light signal in the EDFA. Optionally, a clock/data regenerator can be coupled to the electrical output of the transimpedance amplifier for compensating for noise distortion and timing jitter for affecting the control loop feeding back for adjusting the electrical current into a pump laser of an optical pre-amplifier. Furthermore, the optical receiver of the present invention can also be implemented in a transponder.

Abstract: For regenerating a binary optical signal (sd, sE2) a monolithic semiconductor component (100) comprises: a saturable absorber structure (3) having a saturable absorber section (31), a first optical waveguide (1, 11 to 16) defining a first guide axis (X) disposed on either side of the section (31), a second optical waveguide (2, 21 to 24) defining a second guide axis (Y) crossing the first axis (X) in the section (31) and disposed on either side of the section (31). The saturable absorber structure has a dimension along the first guide axis greater than its dimension along the second guide axis. The first and second waveguides respectively inject an optical clock signal (c1) and the binary optical signal (sd, sE2). Application to optical transmission systems for regenerating signals in accordance with two different regeneration regimes.

Abstract: An optical filter composed of a concatenation of elementary filters consisting of chirped slanted Bragg gratings written on a continuous portion of an optical waveguide, characterized in that the various gratings in the concatenation have the same angle, identical lengths and a linear chirp.

Abstract: An optical device including a laser with a laser cavity having a gain curve with a maximum at a wavelength ?max; and an optical carrier coupled to the cavity. The optical carrier includes a grating that defines a reflection peak coefficient at a wavelength ? that is less than the wavelength ?max by at least 10 nanometers at ambient temperature.

Abstract: The invention is a method for manufacturing an optical module where on forms a groove in a substrate for positioning a component such as an optical component. The optical component is provided to be bonded into the groove by a aluminum oxide bonding process. To prepare the bonding an aluminum layer is deposited on the optical component followed by a protection layer.

Abstract: A wavelength-selective optical add-drop switch includes a first and a second 1×2 wavelength switch optically coupled to one another via at least one mirror. Each of the first and second 1×2 wavelength switches has a switch input and two switch outputs, a wavelength dispersive medium optically coupled to the switch input and the two switch outputs, a lens optically coupled to the wavelength dispersive medium and a segmented beam steering apparatus optically coupled to the lens opposite to the wavelength dispersive medium. The add-drop wavelength switch has a high extinction ratio and low loss.

Abstract: An electro-optical modulator is disclosed that has a microwave input, chip with a thin film resistor or a lumped resistor located between an input RF connector and an RF electrode on a Lithium Niobate chip. The accessory connection chip has a broadband attenuator like a thin film resistor which is placed in a microstrip line for effecting the electrical transmission to Lithium Niobate chip. The insertion of the thin film resistor before the RF electrode lowers the electrical return loss value as a function of frequency, allowing a lower driving voltage design or a reduced chip length without degrading the performances.

Abstract: A controller for an optical amplifier and a method for controlling an optical amplifier are disclosed. The illustrative method includes inputting a set-point to a controller; receiving a portion of an input signal; receiving a portion of an output signal from a first amplifier stage; receiving a portion of an output signal from an attenuation stage; receiving a portion of an output signal from a second amplifier stage and adjusting the first amplifier stage, the second amplifier stage and the attenuation stage based on the received portions to substantially maintain the set-point.

Abstract: The laser type semiconductor optical component comprises: a semiconductor material substrate, a bottom cladding layer containing n-type carriers, an active layer forming one of more quantum wells, and a top cladding layer containing p-type carriers. To increase the emission power of the laser without increasing the vertical divergence of the beam, the bottom cladding layer has a higher refractive index than the top cladding layer. The lasers for pumping optical fiber amplifiers.

Abstract: An optical mode converter comprising an optical guide able to transmit an optical signal in at least one guided mode, characterised in that the optical guide comprises a photosensitive zone inducing a specific index profile along a section of the guide, the said index profile simultaneously defining a longitudinal adiabatic transition and a transverse distribution of the guided mode or modes so as to deconfine the fundamental mode and to maximise the overlap with a higher-order mode.

Abstract: An optical amplifier assembly comprises a Customer Interface module and a plurality of other amplifier modules. The Customer Interface module includes: (i) a customer interface configured to interact with other devices and (ii) optical and electrical connectors, connecting at least one of the other optical amplifier modules to the customer interface.

Abstract: The invention is an optical device having a plurality of optical waveguides and comprising at least one waveguide, which is defined by a core region having first and second sections that are series connected and are capable of transmitting light energy, the core region being surrounded by a cladding that essentially confines the light energy within the core region, the first section of the core region comprising a first length of material whose refractive index increases as temperature increases; the at least one waveguide is temperature-compensating in that and the second section of the core region comprises a second length of material whose refractive index has a sufficient enough difference of the rate of the variation of the index with the temperature, wherein the second section has a plurality of grooves, filled with the material whose refractive index has a sufficient enough difference of the rate of the variation of the index with the temperature, that are designed in a way the effective width of the s

Abstract: The construction of directional couplers according to the invention with the aid of integrated optical waveguides makes it possible to produce such directional couplers in series very compactly and relatively easily. In this connection, the integrated optical waveguides in the coupling region have a smaller cross section than the cross section outside the coupling region. Consequently, it is possible to keep the spacing of the waveguide segments in the coupling region of a directional coupler according to the invention sufficiently far away from one another to minimize the error tolerance conditions in the manufacturing process. This is particularly advantageous if the difference in the refractive indices between the core of the integrated optical waveguide and its surroundings is very large.

Abstract: The present invention relates to the field of optical fiber telecommunications. More specifically, the subject of the invention is a slanted Bragg grating optical fiber and a process for manufacturing such a fiber. The slanted Bragg grating optical fiber of longitudinal axis Z has slanted Bragg gratings photowritten in said fiber and having refractive index modulations along said axis Z, inclined at a same writing angle with respect to a normal plane to said axis Z and defining planes called writing planes forming the same angle than the writing angle with said normal plane, each writing plane forming with others writing planes specific angles called angles of rotation about said axis Z.

Abstract: A method and system for the controlled irradiation of optical fibers in a process for fabricating optical fiber components such as Bragg grating devices. A beam of ultraviolet light is passed through a narrow slit in a mask to form a narrow beam of light. The narrow beam is focused into a line image that is directed onto the optical fiber to produce a photo-induced refractive index change in the optical fiber. The intensity and configuration of the line image as it impinges the optical fiber is controlled to reduce detrimental effects to the fiber.

Abstract: A resonant optical modulator includes an electro-optical substrate, an optical waveguide formed in the substrate and having a variable index of refraction, and an active modulator electrode formed on the substrate in relation to the waveguide to effect electro-optical variation of the index of refraction upon application to the electrode of a modulating signal. An interface port formed on the substrate provides the modulating signal to the electrode from a signal source and has an impedance. An electrical structure, formed on the substrate and coupled to the interface port and the electrode, makes an impedance of the optical modulator substantially equal to the impedance of the signal source. The electrical structure includes a delay line and a stub formed on the substrate.

Abstract: A control system and method for a multi-channel optical amplifier is provided that achieves and automatically maintains a selected gain level by controlling the average inversion level of the dopant atoms in the gain fiber. In both the system and the method, a set point average inversion level that corresponds to a gain set point is first selected. A pump light power output necessary to achieve the set point average inversion level is determined from the optical input power, output power, and pump light remnant power. The same parameters used to achieve and maintain the set point average inversion level are also used to determine linear gain per channel which in turn may be used to minimize tilt or ripple in the gain output of the amplifier.

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 relates to a semiconductor optical amplifier including a buried guide active structure (12), characterized in that the guide active structure (12) is subjected to an external stress to render the gain of said amplifier insensitive to the polarization of the light to be amplified, said external stress coming from a force induced by a deposit of a material (50) against a ridge (15) surrounding said guide active structure (12).

Abstract: Chromatic dispersion of thin-film based mux/demux and add/drop modules can be reduced. Thin-film devices can be arranged in a specific order in the module. Multiple kinds of filters are used to remove “even” and “odd” channels, or other divisions of channels. At least one filter type can be designed for a higher dispersion in transmission but lower dispersion in reflection. At least another filter type can be designed in conjunction with the first filter type such that the sum of the dispersion from the reflection and that from transmission is as low as possible. This ensures that the overall dispersion of the odd and even channels is lower than what one can achieve with one uniform filter.