Systems and methods are provided for creating a sequence of turn-up processes for amplifiers. A method, according to one implementation, includes determining when a fiber span is initially installed in an optical line system or when an Optical Line Failure (OLF) in the fiber span has recovered. The optical line system includes a first set of amplifiers deployed at an upstream node and a second set of amplifiers deployed at a downstream node, the upstream node connected to the downstream node via the fiber span. In response to determining that the fiber span is initially installed in the optical line system or that an ORL in the fiber span has recovered, the method also includes sending a flag from the upstream node to the downstream node to allow the first set of amplifiers to perform a first turn-up process before the second set of amplifiers perform a second turn-up process.

A transmission device including: a signal power detection circuit that detects signal power of a wavelength-division-multiplexed optical signal to be transmitted to a transmission line into which pumping light is inputted from a Raman amplifier; a variable optical attenuator that attenuates the wavelength-division-multiplexed optical signal; and a control circuit that reduces an attenuation amount of the variable optical attenuator depending on an increase in the signal power.

Optical transmission equipment includes an optical transceiver circuit that transmits and receives signal light and supervisory light, a forward Raman amplifier provided at a transmitter end of the optical transceiver circuit, a backward Raman amplifier provided at a receiver end of the optical transceiver circuit, and a processor that controls the forward Raman amplifier and the backward Raman amplifier. When a counterpart backward Raman amplifier or a counterpart forward Raman amplifier provided at an opposite side through a fiber-optic transmission line is started up, the processor turns off a power of the forward Raman amplifier or the backward Raman amplifier according to a supervisory signal received from the fiber-optic transmission line, and releases an off state of the forward Raman amplifier or the backward Raman amplifier after a predetermined period of time.

A light source includes: a seed light source configured to output incoherent seed light with a predetermined bandwidth; and a booster amplifier that is a semiconductor optical amplifier configured to optically amplify the seed light input from a first facet, and output the amplified seed light as amplified light from a second facet, wherein the first facet and the second facet of the booster amplifier are subjected to a reflection reduction treatment, the booster amplifier is configured to operate in a gain saturated state, and relative intensity noise (RIN) and ripple are simultaneously suppressed in the amplified light.

Disclosed herein are methods and systems for automatically configuring a raman amplifier. One exemplary system may be provided with the raman amplifier, a user device, and a network administration device. A processor of the network administration device executes instructions that cause the network administration device to generate a machine learning model using machine learning techniques and deploy the machine learning model to a controller of the raman amplifier. When a desired gain profile is communicated from the user device to the controller of the raman amplifier, instructions stored in non-transitory computer readable memory cause a processor of the controller to automatically assess the desired gain profile using the machine learning model to determine raman pump configurations for each of a plurality of raman pumps of the raman amplifier and send the determined raman pump configurations to each of the plurality of raman pumps of the raman amplifier.

Disclosed are a control method and an optical fiber amplifier. The optical fiber amplifier is configured to execute the control method. The method comprises: initially correcting a target gain on the basis of a first compensation gain to obtain an initially corrected target gain; when the actual power of the pump laser reaches target power determined on the basis of the initially corrected target gain obtaining, on the basis of a first signal optical power and a second signal optical power, a second compensation gain and a first compensation slope through calculation; correcting the initially corrected target gain again according to the second compensation gain to obtain a corrected target gain; and correcting a target slope according to the first compensation slope to obtain a corrected target slope. This solution can provide high precision control for the gain and the slope of the optical fiber amplifier.

An optical amplifier assembly and a detection method capable of dynamically performing optical time-domain reflection detection. The detection method comprises obtaining signal light intensity detection signals from a first and second photodetectors and sending a control signal to an L-band Raman pump when the signal light intensity in the second photodetector is lower than a first preset threshold, so that the L-band Raman pump enters into an optical time-domain reflection detection mode; sending a control signal to the L-band Raman pump when the signal light intensity in the second photodetector is greater than or equal the first preset threshold, so that the L-band Raman pump enters into an L-Band Raman optical fiber amplifier operation mode.

This disclosure describes, among other things, an Optical Communications Module Link Extender (OCML) including embedded Ethernet and PON amplification rather than relying on a separate amplification module for Ethernet and/or PON signals transmitted through the OCML. Providing an OCML that is able to provide the appropriate amplification to transmit both Ethernet and PON signals may be accomplished by using one or more Raman pumps on the signals transmitted in the upstream direction through the OCML (for example, upstream from one or more customer devices to one or more OLTs for PON signals. This OCML configuration may allow for a more cost-effective and efficient system with a smaller footprint than a system that relies on external amplification modules to transmit Ethernet or PON signals.

The present invention is to provide a backscattered light amplification device, an optical pulse test apparatus, a backscattered light amplification method, and an optical pulse test method for amplifying a desired propagation mode of Rayleigh backscattered light with a desired gain by stimulated Raman scattering in a fiber under test having the plurality of propagation modes. The backscattered light amplification device according to the present invention is configured to control individually power, incident timing, and pulse width of a pump pulse for each propagation mode when the pump pulse is incident in a plurality of propagation modes after the probe pulse is input to the fiber under test in any propagation mode.

A filter includes a first filter component coupled to a second filter component. The first filter component is configured to receive an optical signal, and filter the optical signal based on a first power difference of signals transmitted on a plurality of frequency bands in the optical signal, where the first power difference includes a difference caused by a first doped optical fiber. The second filter component is loaded with a first driving electrical signal used to control a frequency response of the second filter component. The second filter component is configured to filter, using the frequency response based on a second power difference of the signals transmitted on the plurality of frequency bands, an optical signal obtained after the filtering by the first filter component.