Systems and methods for optical modulation index calibration in a CATV network.

A method for use in a headend communications device, the method including receiving an input data signal over a fiber optic port, switching the input data signals to a plurality of data signals, converting the data signals to output coaxial cable signals and transmitting the output coaxial cable signals.

Per-port performance optimization may be provided. First, performance data may be received corresponding to each of a plurality of ports. Then it may be determined that performance of at least one of the plurality of ports can be improved based on the received performance data corresponding to the least one of the plurality of ports. Next, in response to determining that the performance of the at least one of the plurality of ports can be improved, at least one of a plurality of components may be adjusted corresponding to the at least one of the plurality of ports to improve performance of the least one of the plurality of ports.

The present disclosure is directed to an optical transmission system including an optical transmitter and an optical receiver. The optical transmitter including a transmitting circuitry configured to receive electrical signals from a source device; at least one laser configured into the transmitting circuitry for converting the electrical signals into light signals; a first interface electrically connected to the transmitting circuitry and configured to connect the transmitting circuitry to the source device; and a plurality of optical connectors connected to the transmitting circuitry for receiving the light signals, the plurality of optical connectors configured to removably connect to a plurality of transmitting optical fibers for transmitting light signals. The optical receiver including a receiving circuitry configured to receive the light signals from the transmitting optical fibers and convert the light signals into the electrical signals.

Methods and systems for modulating an amplifier power supply to efficiently attain amplified RF output power with much lower power dissipation than existing amplifiers.

Techniques for transmitting an optical signal through optical fiber with an improved cost effective stimulated Brillouin scattering (SBS) suppression include externally modulating a light beam emitted from a light source with a high frequency signal. The light beam is also modulated externally with an RF information-carrying signal. The high frequency signals are at least twice a highest frequency of the RF signal. The high frequency signals modulating the light source can be gain and phase adjusted by the first set of gain and phase control circuit to achieve a targeted spectrum shape. The adjusted high frequency signals then are split, providing a portion of the split signals to modulate the light source and another portion of the split signals to the second set of phase and gain control circuit for adjusting a phase/gain. The output of second set of phase and gain control circuits can be applied to the external modulator to eliminate intensity modulation caused by the corresponding high frequency signals that modulate the light source. The spread spectrum for SBS suppression or the optical transmitter's SNR is further improved by cancelling a beat between SBS suppression modulation tones and out of band distortion spectrum of information bearing RF signal.

A network element (200) of a cable television (CATV) network, comprising an input (204) for upstream signal transmission; at least two diplex filters (210, 212, 214) configured to be connected to said input (204), a first diplex filter (210) comprising a bandpass filter for a first upstream frequency band and a second diplex filter (212) comprising a bandpass filter for a second upstream frequency band; a switch (208) for connecting one of said at least two diplex filters to said input; wherein the network element is configured to be remotely controlled by a headend of the CATV network for selecting the diplex filter.

A HDMI apparatus is provided. The HDMI apparatus includes a first audio/video transceiver (A/V transceiver) configured to transmit an optical A/V signal to a second A/V transceiver; and a first sideband transceiver configured to drive a first laser diode to transmit a first optical sideband signal including a first control information or a first power information; wherein the first control information or the first power information is converted by a first Serializer/Deserializer (SERDES).

To provide a user with an effect switcher having improved usability. The effect switcher includes an output terminal that outputs a plurality of first video signals to be transmitted to a multi-view processor, as an optical multiplex signal. For example, the effect switcher further includes: an output terminal that outputs a single second video signal to be transmitted to the multi-view processor; and an information insertion unit that inserts, into the optical multiplex signal, information for designating a display region of an image based on the single second video signal on a screen on which an image based on each of the first video signals is displayed.

The present disclosure is directed to an optical transmission system including an optical transmitter and an optical receiver. The optical transmitter including a transmitting circuitry configured to receive electrical signals from a source device; at least one laser configured into the transmitting circuitry for converting the electrical signals into light signals; a first interface electrically connected to the transmitting circuitry and configured to connect the transmitting circuitry to the source device; and a plurality of optical connectors connected to the transmitting circuitry for receiving the light signals, the plurality of optical connectors configured to removably connect to a plurality of transmitting optical fibers for transmitting light signals. The optical receiver including a receiving circuitry configured to receive the light signals from the transmitting optical fibers and convert the light signals into the electrical signals.