An optical path control system is provided. The optical path control system includes a converging lens used to converge a plurality of light beams passing through the converging lens, and an optical path assembly used to control propagation directions of the plurality of light beams passing through the optical path assembly. When the plurality of light beams pass through the optical path assembly and the converging lens sequentially, the optical path assembly converges the plurality of light beams, and the converging lens converges each of the plurality of light beam into a point of light.

A method for transmission of orbital angular momentum (OAM) data over an optical fiber involves generating an optical signal at a selected wavelength. A ratio of a diameter of a core of the optical fiber to the selected wavelength of the optical signal enables transmission of a predetermined number of orbital angular momentum modes over the optical fiber. The optical signal is modulated with at least one input data stream and an OAM signal is applied to the modulated optical signal to generate the OAM data signal. The OAM data signal is transmitted over the optical fiber using a fiber launcher. A received OAM data signal is processed to extract the at least one input data stream.

In a system for converting digital data into a modulated optical signal, an electrically controllable device, including a modulator having one or more actuating electrodes, provides an analog-modulated optical signal that is modulated in response to output data bits of a digital-to-digital mapping. A digital-to-digital conversion provides the mapping of input data words to the output data bits. The mapping enables adjustments to correct for non-linearities and other undesirable characteristics, thereby improving signal quality.

The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using nDSQ format(s) over optical communication networks. In certain embodiments, the communication interface is used by various devices, such as spine switches and leaf switches, within a spine-leaf network architecture, which allows large amount of data to be shared among servers.

An optoelectronic transmitter including a semiconductor substrate, at least one laser source, and a high numerical aperture (NA) waveguide is provided. The laser source is disposed on the semiconductor substrate and configured to emit at least one laser beam. The high numerical aperture (NA) waveguide has an NA greater than or equal to 0.5 and is disposed on the semiconductor substrate. At least a part of the laser beam from the laser source enters the high NA waveguide, wherein no lens is disposed on the light path of the laser beam between the laser source and the high NA waveguide. An optoelectronic receiver and an optoelectronic transceiver are also provided.

An optical receiver is provided. The optical receiver includes a fiber support structure located on a front side of a back plate. The fiber support structure supports and guides a plurality of scintillating fibers in a spiral arrangement extending from a back orifice through the back plate. A central guide located around the back orifice is adapted to gather and collect the plurality of scintillating fibers from their disperse spiral arrangement on the fiber support structure and direct them through the back orifice as a bundle into a photo detector located behind the back plate.

A method for realizing precise gain control for a hybrid fibre amplifier, and a hybrid fibre amplifier, in which by an erbium-doped fibre amplifier firstly outputting a constant power, a comparable source signal optical power is provided for a raman fibre amplifier of a next stage. A feedback for the gain control may be formed by comparing a source signal optical power calculated after starting pumping of the Raman fibre amplifier and a source signal optical power detected after pumping stops, thereby greatly improving gain control precision of the Raman fibre amplifier. Moreover, the erbium-doped fibre amplifier parts of all the hybrid fibre amplifiers may simultaneously output a constant optical power, and the Raman amplifier parts of all the hybrid fibre amplifiers may simultaneously start calibration, so that the time for starting operation of the entire system may be improved greatly.

An example optical module includes: an optical splitter configured to split a received incident optical signal into a first optical signal and a second optical signal; a wavelength filter sheet configured to receive the second optical signal to reflect a first part of the second optical signal to generate reflected light, and to transmit a second part of that to generate transmitted light; a first photo detector configured to convert the reflected light into an electric signal; a second photo detector configured to convert the transmitted light into an electric signal; and an MCU configured to obtain the first detected signal and the second detected signal, to determine the difference in optical power between the reflected light and the transmitted light, and to determine from the difference in optical power and a specified standard difference in optical power whether the wavelength of the second optical signal is shifted.

An optical system is provided including a light source configured to emit a light; and a polarizing splitting multiplexing device including a first prism configured to split the light into two polarized light beams having different optical path lengths, and a second prism configured to combine the two polarized light beams. The first prism includes a first reflective surface and a first polarization splitting surface facing the first reflective surface, and the second prism includes a second reflective surface and a second polarization splitting surface facing the second reflective surface.

A transimpedance amplifier (TIA) structure includes an input node with a variable inductance component serving to reduce variation in peak amplitude over different gain conditions. According to certain embodiments, an inductor at the TIA input has a first node in communication with a Field Effect Transistor (FET) drain, and a second node in communication with the FET source. A control voltage applied to the FET gate effectively controls the input inductance by adding a variable impedance across the inductor. Under low gain conditions, lowering of inductance afforded by the control voltage applied to the FET reduces voltage peaking. TIAs in accordance with embodiments may be particularly suited to operate over a wide dynamic range to amplify incoming electrical signals received from a photodiode.