Novel integrated tunable laser using filtered feedback for simple and very fast tuning

We present a novel integrated tunable laser based on filtered feedback, which combines a simple tuning method with ns switching speed

Fast integrated tunable laser using filtered feedback

A novel integrated tunable laser is presented which combines a simple tuning method with ns switching speed. The Photonic Integrated Circuit consists of a Fabry-Perot laser with deeply-etched DBR mirrors. The Fabry-Perot modes can be selected independently using an Arrayed Waveguide Grating and then re-injected into the laser cavity, forcing single mode operation at the wavelength of that mode. 4ns switching time as well as 15 dB SMSR is demonstrated on the prototype device

Integrated filtered-feedback tunable laser with enhanced control of feedback phase

Recently we presented a novel discretely tunable laser that consists of a Fabry-Perot laser which was forced to operate in single-mode condition by applying on-chip filtered feedback. The laser switches extremely fast (3 ns) and requires simple on/off control currents to switch the wavelength. In these first devices it was not possible to control the phase of the feedback light independently from the feedback intensity. In was solved by adding an extra electrode allowing us to control the phase separately. In this paper we present the new device and study the effect of the control ofthefeedbackphase in order to improve the performance ofthe original tunable laser concept

Integrated filtered-feedback tunable laser with enhanced control of feedback phase

Recently we presented a novel discretely tunable laser that consists of a Fabry-Perot laser which was forced to operate in single-mode condition by applying on-chip filtered feedback. The laser switches extremely fast (3 ns) and requires simple on/off control currents to switch the wavelength. In these first devices it was not possible to control the phase of the feedback light independently from the feedback intensity. In was solved by adding an extra electrode allowing us to control the phase separately. In this paper we present the new device and study the effect of the control ofthefeedbackphase in order to improve the performance ofthe original tunable laser concept

Simulations of fast switching between longitudinal modes of the novel semiconductor tunable laser with filtered optical feedback

A system of delay differential rate equations is introduced as a tool to investigate switching dynamics induced by on-chip filtered feedback in Photonic Integrated Circuits. We show different switching mechanisms between lasing modes that can be induced by modulation of the frequencies of the feedback filter. Finally a novel integrated tunable laser is presented which operates according to such control scheme

Discretely tunable laser based on filtered feedback for telecommunication applications

A novel discretely tunable laser based on filtered feedback is presented. The semiconductor device consists of a Fabry-Perot laser with deeply etched broadband distributed Bragg reflector mirrors. Single-mode operation is achieved by using feedback from an integrated filter. This filter contains an arrayed waveguide grating wavelength router and a semiconductor optical amplifier gate array. Design, simulation, and the first characterization results of this new integrated filtered-feedback tunable laser device are presented. It shows a combination of a simple and robust switching algorithm with good wavelength stability. A rate equation model predicts that a properly designed device can switch within 1 ns. The fast switching and reduced control complexity makes the device very promising for various advanced applications in optical telecommunication networks

Novel integrated tuneable laser using filtered feedback

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Tuning the emission wavelength of semiconductor ring lasers with on-chip filtered optical feedback

In this paper we discuss the use and implementation of on-chip filtered optical feedback in order to tune the emission wavelength of a semiconductor ring laser. In this device, a directional coupler is used to couple part of the light emitted by the laser to a feedback section integrated on the same chip. The feedback section contains two arrayed waveguide gratings and a set of semiconductor optical amplifiers to provide filtering of particular longitudinal modes sustained by the ring cavity. Each of the two counter-propagating modes supported by the ring laser is coupled back into the same direction after filtering in the feedback section. We show that, for appropriate currents injected into the semiconductor optical amplifiers, the emission wavelength can be tuned and that single mode operation in both directions is achieved. We use a rate equation model in order to demonstrate tuning of the device theoretically

Integrated tunable laser with ns-switching speed using filtered feedback

A new integrated tunable laser combining simple tuning method with ns switching speed has been designed, fabricated and investigated. It consists of a Fabry-Perot laser with deeply-etched DBR mirrors. The Fabry-Perot modes can be selected independently using an Arrayed Waveguide Grating (AWG) and then re-injected into the laser cavity, forcing single mode operation. A rate equation model predicts that a properly designed device can switch within 1 ns, while characterization measurements show a value of only 3 ns

Fast integrated discretely tunable laser using filtered feedback for packet switching and access network applications

In this paper we report the design, fabrication, simulation and characterization of a novel discretely tunable laser based on filtered feedback. This Integrated Filtered-Feedback Tunable Laser (IFF-TL) device combines a simple and robust switching algorithm with good wavelength stability. It consists of a Fabry-Perot laser with deeply-etched broadband DBR mirrors. Single mode operation is achieved by using feedback from an integrated filter. This filter contains an AWG wavelength router and an SOA gate array. A rate equation model predicts that a properly designed device can switch within 1 ns, while characterization measurements show a value of only 4 ns. The fast switching and reduced control complexity makes the device very promising for various advanced applications in optical telecommunication networks