Innolume Gmbh

Igor Krestnikov

Daniil Livshits

Alexey Kovsh

Sergey Mikhrin

Alexey Gubenko

Alexey Zhukov

Greg Wojcik

Juergen Kurb

A transversely-coupled distributed feedback laser diode, which can be processed without overgrowth, is disclosed. The laser is made from an epitaxial heterostructure including a core layer located between two cladding layers, a cap layer, and at least one Al-rich layer. The lateral waveguide is formed by selective oxidation of the Al-rich layer. A surface corrugated grating is formed above the waveguide. The heteroepitaxial structure is designed so that the core layer is placed in close proximity to the top of the laser structure to provide a required overlap between the light and the grating. In order to avoid inadmissible optical losses, there is no metallization above the waveguide. Instead, the metal contacts are offset at some distance, so that the current has to spread in the cap layer before vertical injection into the core layer.

Single-step-grown transversely coupled distributed feedback laser

Waveguide designs and fabrication methods provide adiabatic waveguide eigen mode conversion and can be applied to monolithic vertical integration of active and passive elements in PICs. An advantage of the designs and methods is a simple fabrication procedure with only a single etching step in combination with subsequent well-controllable selective oxidation. As a result, improved manufacturability and reliability can be achieved.

Adiabatic mode-profile conversion by selective oxidation for photonic integrated circuit

A semiconductor laser comprises an electrically isolated active section and at least one noise reducing section and operates on a ground state transition of a quantum dot array having inhomogeneous broadening greater than 10 nm. The laser preferably emits more than 10 optical modes such that a total relative intensity noise of each optical mode is less than 0.2% in the 0.001 GHz to 10 GHz range. The spectral power density is preferably higher than 2 mW/nm. An optical transmission system and a method of operating a quantum dot laser with low relative intensity noise of each optical mode are also disclosed.

Semiconductor laser with low relative intensity noise of individual longitudinal modes and optical transmission system incorporating the laser

An optoelectronic module includes a semiconductor structure with a substrate having a first side and a second side, a first layered structure deposited on the first side, and a second layered structure deposited on the second side. The optoelectronic module also includes driver circuitry fabricated of the first layered structure and a diode laser fabricated of the second layered structure. The driver circuitry produces a drive electrical signal supplied to the diode laser, and the diode laser produces an optical output in response to the drive electrical signal. In a preferred embodiment, the optoelectronic module also includes a temperature-sensitive element fabricated of the first or the second layered structure. The temperature-sensitive element produces a temperature dependent control signal related to the diode laser temperature.

Double-sided monolithically integrated optoelectronic module with temperature compensation

An efficient long-wavelength light-emitting diode has a resonant-cavity design. The light-emitting diode preferably has self-organized (In,Ga)As or (In,Ga)(As,N) quantum dots in the light-emitting active region, deposited on a GaAs substrate. The light-emitting diode is capable of emitting in a long-wavelength spectral range of preferably 1.15-1.35 &#x3bc;m. The light-emitting diode also has a high efficiency of preferably at least 6 mW and more preferably at least 8 mW at an operating current of less than 100 mA and a low operating voltage of preferably less than 3V. In addition, the light-emitting diode preferably has an intensity of maxima, other than the main maximum of the emission spectrum, of less than 1% of an intensity of the main maximum. This combination of parameters makes such a device useful as an inexpensive optical source for various applications.

Long-wavelength resonant-cavity light-emitting diode

An optical transmission system includes a laser, a transmitter and a receiver. The laser is capable of operating on an inhomogeneously broadened optical transition of the active region of the laser. A spectral bandwidth of an output lasing spectrum of the laser is greater than 5 nm and a spectral power density of the laser is greater than 2 mW/nm such that an optical power of the laser is greater than 10 mW. The laser provides a plurality of optical signals at different wavelengths. The transmitter is capable of providing modulation to each lasing wavelength independently and the receiver is capable of providing detection to each lasing wavelength independently.

Optical transmission system

A quantum dot laser operates on a quantum dot ground-state optical transition. The laser has a broadband (preferably&#x2267;15 nm) spectrum of emission and a high output power (preferably&#x2267;100 mW). Special measures control the maximum useful pump level, the total number of quantum dots in the laser active region, the carrier relaxation to the quantum dot ground states, and the carrier excitation from the quantum dot ground states. In one embodiment, a spectrally-selective loss is introduced into the laser resonator in order to suppress lasing on a quantum dot excited-state optical transition, thereby increasing the bandwidth of the emission spectrum.

Laser source with broadband spectrum emission

A quantum dot laser operates on a quantum dot ground-state optical transition. The laser has a broadband (preferably &#x2267;15 nm) spectrum of emission and a high output power (preferably &#x2267;100 mW). Special measures control the maximum useful pump level, the total number of quantum dots in the laser active region, the carrier relaxation to the quantum dot ground states, and the carrier excitation from the quantum dot ground states. In one embodiment, a spectrally-selective loss is introduced into the laser resonator in order to suppress lasing on a quantum dot excited-state optical transition, thereby increasing the bandwidth of the emission spectrum.

Growing community of inventors

Dortmund, Germany

Igor Krestnikov