A photonic device is configured with a photonic integrated circuit (PIC), a plurality of fiber-based gain mediums in optical communication with the PIC, and at least one optical pump outputting pump light coupled into two or more gain mediums. At least one of the fiber-based gain media and the PIC form a hybrid resonant optical cavity there between operative to lase light into the PIC. The gain media further include one or more fiber amplifiers amplifying light signals coupled into and decoupled from the PIC. The photonic device is integrated with Si photonic passive and active photonic elements, while ail fiber links between the gain media and PIC are free from these elements.

Disclosed herein are methods and systems for configuring a raman amplifier. One exemplary system may be provided with a raman amplifier having a plurality of raman pumps and a controller, and a network administration device. The network administration device generates and deploys a first machine learning model and a second machine learning model to the controller of the raman amplifier. A desired gain profile may be automatically assessed using the first machine learning model to determine raman pump configurations for each of the plurality of raman pumps of the raman amplifier. The raman pump configurations for each of the plurality of raman pumps of the raman amplifier may be processed with the second machine learning model to produce an output gain profile. The determined raman pump configurations are deployed only if the output gain profile and the desired gain profile match to within a margin of error.

Disclosed is a measurement system for analysing RF signals. The measurement system includes an optically transparent enclosure including an optically pumpable gas, and a printed circuit board, PCB including an electrical transmission line for guiding the RF signal to be analyzed through the enclosure and a reflective planar face. The measurement system includes an optical pump for emitting preferably coherent light onto the reflective planar face, and a detector for detecting an optical property of the emitted light being reflected by the reflective planar face. This provides a better laser/microwave overlap in atomic vapor quantum sensing setups, where it is crucial to overlap the regions with highest laser intensity and microwave field strength.

Disclosed is a measurement system for analysing RF signals. The measurement system includes an optically transparent enclosure including an optically pumpable gas, and a printed circuit board, PCB including an electrical transmission line for guiding the RF signal to be analyzed through the enclosure and a reflective planar face. The measurement system includes an optical pump for emitting preferably coherent light onto the reflective planar face, and a detector for detecting an optical property of the emitted light being reflected by the reflective planar face. This provides a better laser/microwave overlap in atomic vapor quantum sensing setups, where it is crucial to overlap the regions with highest laser intensity and microwave field strength.

Photonic chip includes an external cavity (EC) optical circuit to provide wavelength-selective optical feedback to a length of active optical fiber. Light generated in the active optical fiber may be coupled from the EC circuit to a light processing circuit of the photonic chip, such as an optical modulator or an optical mixer. The EC circuits may include single-frequency and multi-frequency optical filters, which may include ring resonators, dual-ring resonators, and optical modulators to support multi-frequency lasers. The EC circuits may further include pump combiners and optical isolators.

A high-precision repetition rate locking apparatus for an ultra-fast laser pulse includes: an electronic controlling component comprising: a standard clock, configured to provide a high-precision frequency standard; a pulse generator (PG), configured to provide an electrical pulse signal with adjustable repetition rate, pulse width and voltage magnitude; and a signal generator (SG), connected to the standard clock and the PG, and configured to provide a stable frequency signal for the PG, a phase-shift adjusting component, connected to the electronic controlling component and configured to implement phase modulation through electrically induced refractive index change; a resonant cavity component, comprising a phase shifter, a doped fiber, a laser diode, a wavelength division multiplexer and a reflector, and configured to generate a mode-locked pulse; and a detection system, configured to measure a repetition rate of an output pulse.

A multiple stage optical amplification device in a light detection and ranging (LiDAR) scanning system is provided. The system comprises a first power amplification stage receiving seed laser light and outputting first amplified laser light; a second power amplification stage receiving the first amplified laser light and outputting a second amplified laser light; and a single optical power pump coupled to the second power amplification stage. The second power amplification stage is configured to amplify the first amplified laser light to generate the second amplified laser light. A first portion of pump power provided by the optical power pump is deliverable to the first power amplification stage to amplify the seed laser light.

A multiple stage optical amplification device in a light detection and ranging (LiDAR) scanning system is provided. The system comprises a first power amplification stage receiving seed laser light and outputting first amplified laser light; a second power amplification stage receiving the first amplified laser light and outputting a second amplified laser light; and a single optical power pump coupled to the second power amplification stage. The second power amplification stage is configured to amplify the first amplified laser light to generate the second amplified laser light. A first portion of pump power provided by the optical power pump is deliverable to the first power amplification stage to amplify the seed laser light.

Disclosed are embodiments for multi-band pumping of a doped fiber source. The doped fiber source has a first absorption band and a second absorption band that is different from the first absorption band. In some embodiments, a first laser pump generates a first pump power in a first pump band corresponding to the first absorption band that is generated. A second laser pump generates a second pump power in a second pump band corresponding to the second absorption band. The second pump band is different from the first pump band. The first and second pump power is simultaneously applied to the doped fiber source.

A method of generating an optical pulse train using spectral extension by optical phase modulation, spectral narrowing by optical phase demodulation, and narrow linewidth optical filtering is disclosed. It is also described that the wavelength selection of light using a chromatic dispersion element between the optical phase modulator can enrich the method. Systems include an in-line optical setup and a ring-type laser cavity for mode-locked laser outputs. The duration with which the electrical signals driving the modulators are opposed determines the line width of the optical pulses, and the opposite repetition of the electrical signals defines the rate of repetition of an optical pulse train generated. Four different arrangements of electrical signals in the time domain or phase domain make it possible to control the generation of optical pulses and the wavelength selection of the light. (i) A signal arrangement comprising sinusoidal electrical signals with a slight frequency difference. (ii) A signal arrangement comprising a phase-shift between electrical signals. (iii) A signal arrangement comprising a phase-shift between electrical signals depending on the amplitude of the bits. (iv) A signal arrangement comprising random electric waves that repeat themselves over a predefined period to allow the insertion of controllable time delays between each other.