An optoelectronic signal translating device having a region containing rare earth or transition metal ions for generation of radiation of a predetermined wavelength. Said region includes an organic complex comprising a ligand adapted to enhance the emission of radiation and a chromophore separately co-operable with a radiation source of wavelength not greater than that of said predetermined desired radiation. Said chromophore can be excited to cross-couple with the upper permitted energy state of said rare earth or transition metal ions, thereby generating said predetermined desired radiation by subsequent decay of said ions to the permitted lower energy state.

A photonics frequency comb generator includes two integrated dies: an indium phosphide die laser of a first wavelength is grown on from, and a silicon photonics die having a microring resonator connected to the laser and frequency modulators. The microring resonator converts the first wavelength into a number of second wavelengths. One type of the microring resonator is a hybrid non-linear optical wavelength generator, comprising non-silicon materials, such as SiC or SiGe built on silicon to yield a non-linear wavelength generation. The second wavelengths are generated by adjusting the ring's geometric size and a distance between the ring and the traverse waveguide. Another type of microring resonator splits the first wavelength into a plurality of second wavelengths and transmits the multiple second wavelengths to filters and modulators, and each selects and modulates one of the second wavelengths in a one-to-one relationship. This frequency comb generator has applications in WDM/CWDM and multi-chip modules in high speed transceivers.

A photonics frequency comb generator includes two integrated dies: an indium phosphide die laser of a first wavelength is grown on from, and a silicon photonics die having a microring resonator connected to the laser and frequency modulators. The microring resonator converts the first wavelength into a number of second wavelengths. One type of the microring resonator is a hybrid non-linear optical wavelength generator, comprising non-silicon materials, such as SiC or SiGe built on silicon to yield a non-linear wavelength generation. The second wavelengths are generated by adjusting the ring's geometric size and a distance between the ring and the traverse waveguide. Another type of microring resonator splits the first wavelength into a plurality of second wavelengths and transmits the multiple second wavelengths to filters and modulators, and each selects and modulates one of the second wavelengths in a one-to-one relationship. This frequency comb generator has applications in WDM/CWDM and multi-chip modules in high speed transceivers.

Example methods, devices, and systems for optical emission are disclosed. An example device can comprise one or more optical filters. The one or more optical filters can be configured to be coupled to an optical amplifier. The device can comprise a microresonator configured to receive an output of the one or more optical filters and output, based on parametric multiwave mixing, a frequency comb. The one or more optical filters and the microresonator can be integrated into a single chip.

A narrow linewidth external cavity semiconductor laser comprises semiconductor optical amplifier chip, comb-shaped optical filter, bandpass optical filter, partial reflection sheet, and collimated light beam coupling output assembly Collimated light beam coupling output assembly is composed of isolator, coupling lens, and output optical fiber. Laser resonant cavity is formed by partial reflection sheet and rear end face of semiconductor optical amplifier chip. Comb-shaped optical filter and bandpass optical filter form single-channel narrowband optical filtering assembly. Bandwidth enables laser to perform single-mode lasing and effectively restrain any other mode lasing. Longitudinal mode's relative position over whole filtering band may be controlled by adjusting laser temperature. Output wavelength and laser power are controlled and in best working state. Etalon is used as comb-shaped optical filter to easily realize narrow linewidth output. Commercial DWDM optical filter is used as bandpass optical filter to improve device wavelength flexibility and reduce costs.

The invention relates to a MOPA laser system having at least one laser oscillator (MO), which generates laser radiation at an emission wavelength (.sub.0), and having an optical amplifier (PA) downstream the laser oscillator (MO) in the propagation direction of the laser radiation, which optical amplifier amplifies the laser radiation and thereby spectrally broadens it to a useful bandwidth (). It is an object of the invention to provide an improved MOPA laser system which is designed for a high power of the amplified laser radiation and which is insensitive to back-reflection. Unavoidable back-reflections should neither affect the output power of the optical amplifier (PA), nor lead to the destruction of the laser oscillator (MO) or other components of the system. This object is achieved by the invention in that an optical bandpass filter (BPF) is arranged between laser oscillator (MO) and amplifier (PA), which optical bandpass filter is transparent to laser radiation at the emission wavelength (.sub.0), wherein those spectral components of the returning, that is, counter to the propagation direction, laser radiation impinging on the bandpass filter (BPF), which, in terms of wavelength, lie outside the passband (4), are reflected at the bandpass filter (BPF) in the propagation direction.

The invention relates to a MOPA laser system having at least one laser oscillator (MO), which generates laser radiation at an emission wavelength (.sub.0), and having an optical amplifier (PA) downstream the laser oscillator (MO) in the propagation direction of the laser radiation, which optical amplifier amplifies the laser radiation and thereby spectrally broadens it to a useful bandwidth (). It is an object of the invention to provide an improved MOPA laser system which is designed for a high power of the amplified laser radiation and which is insensitive to back-reflection. Unavoidable back-reflections should neither affect the output power of the optical amplifier (PA), nor lead to the destruction of the laser oscillator (MO) or other components of the system. This object is achieved by the invention in that an optical bandpass filter (BPF) is arranged between laser oscillator (MO) and amplifier (PA), which optical bandpass filter is transparent to laser radiation at the emission wavelength (.sub.0), wherein those spectral components of the returning, that is, counter to the propagation direction, laser radiation impinging on the bandpass filter (BPF), which, in terms of wavelength, lie outside the passband (4), are reflected at the bandpass filter (BPF) in the propagation direction.

A narrow linewidth external cavity semiconductor laser comprises semiconductor optical amplifier chip, comb-shaped optical filter, bandpass optical filter, partial reflection sheet, and collimated light beam coupling output assembly Collimated light beam coupling output assembly is composed of isolator, coupling lens, and output optical fiber. Laser resonant cavity is formed by partial reflection sheet and rear end face of semiconductor optical amplifier chip. Comb-shaped optical filter and bandpass optical filter form single-channel narrowband optical filtering assembly. Bandwidth enables laser to perform single-mode lasing and effectively restrain any other mode lasing. Longitudinal mode's relative position over whole filtering band may be controlled by adjusting laser temperature. Output wavelength and laser power are controlled and in best working state. Etalon is used as comb-shaped optical filter to easily realize narrow linewidth output. Commercial DWDM optical filter is used as bandpass optical filter to improve device wavelength flexibility and reduce costs.

In a signal regeneration device in which recovery of a signal quality which has been degraded during transmission in optical communication and extension of a transmission distance are achieved, the most representative method of quantizing an optical phase is a phase sensitive amplifier (PSA) and a technique that utilizes an optical parametric process through use of a highly nonlinear optical medium, but there is a demand for a technique of quantizing an optical phase which is not accompanied with an optical parametric gain, has small-sized elements, is easily integrated, and does not require high power pump light. By a technique of a hybrid optical phase squeezer (HOPS), when a phase of input light is quantized to M levels (M>2), phase conjugate light of the input light and (M1)th phase harmonic light of the input light are subjected to power modulation to be coherently added, so that quantization of the optical phase is performed through use of a simple four-wave mixing (FWM) that is not accompanied with the optical parametric gain and a general optical amplifier by using a general nonlinear optical medium such as silicon, and accordingly, a GER of equal to or higher than 30 dB can be obtained, even if a nonlinear optical element having a low nonlinearity is used.

Systems and methods which provide for the generation of optical frequency combs using a microring resonator optical frequency comb generator configuration are described. A microring resonator optical frequency comb generator configuration of embodiments comprises a plurality of fiber loop laser cavities and at least one microring cavity are utilized. For example, an optical frequency comb generator may include a first fiber loop laser cavity, a second fiber loop laser cavity that is symmetrical with the first fiber loop laser cavity, and a microring resonator that is coupled into both of the first and second fiber loop laser cavities. The microring resonator may be configured to provide a high quality factor, Q, value. The microring resonator of embodiments works together with optical bandpass filters and amplifiers in the multiple fiber loops to make the generated optical frequency comb stable and flexible.