Abstract: A method for calibrating an optical transceiver. The method can include configuring optical switches to enable routing at least one output signal of modulator circuitry operably coupled to a first receive path of a coherent optical transceiver. The method can include configuring the input to at least one modulator to generate at least one first stimulus signal. The method can include configuring a path from the first receiver analog-to-digital converter to an adaptive algorithm circuitry. The method can include adapting at least one bias setting of a photodiode associated with the first receiver in response to at least one first stimulus detected at the first receiver analog-to-digital converter to an adaptive algorithm circuitry. The method can include determining an optimum value of a photodiode associated with the first receiver.

Abstract: A method for determining whether a target cell has experienced interference due to Passive Intermodulation (PIM) distinguished from other forms of interference at cellular network sites during a time window. In one aspect, the method includes defining a set of N time slices and obtaining a first performance metric for each of the N time slices. The method includes selecting a subset of the N time slices using a set of N first performance metrics where the subset of N time slices includes a first time slice. For the first time slice, at least a first data point is determined using a performance metric for the target cell that was collected during the first time slice. The method includes using the first data point and a supervised learning model to determine whether the target cell has experience PIM interference during the time window.

Abstract: A method for determining whether a target cell has experienced interference due to Passive Intermodulation (PIM) distinguished from other forms of interference at cellular network sites during a time window. In one aspect, the method includes defining a set of N time slices and obtaining a first performance metric for each of the N time slices. The method includes selecting a subset of the N time slices using a set of N first performance metrics where the subset of N time slices includes a first time slice. For the first time slice, at least a first data point is determined using a performance metric for the target cell that was collected during the first time slice. The method includes using the first data point and a supervised learning model to determine whether the target cell has experience PIM interference during the time window.

Abstract: A tunable laser has a first optical element spaced apart from a second optical element to form a laser cavity of fixed length there between. An optical gain medium is in at least part of the laser cavity A third optical element is selectively spaced apart from and facing the first optical element or is selectively spaced apart from and facing the second optical element.

Abstract: An optical device includes a first substrate and a sub-wavelength form-birefringent metal oxide retarder plate formed on at least a portion of the substrate. A silicon oxide or silicon oxynitride layer contacts at least a surface of the retarder plate, and a second substrate, having at least one micro-electro-mechanical system device, is bonded to the silicon oxide or silicon oxynitride layer via a second silicon oxide or silicon oxynitride layer.

Abstract: A tunable laser has a first optical element spaced apart from a second optical element to form a laser cavity of fixed length there between. An optical gain medium is in at least part of the laser cavity A third optical element is selectively spaced apart from and facing the first optical element or is selectively spaced apart from and facing the second optical element.

Abstract: At least first and second narrowband beams of light, respectively of different wavelengths, are concurrently directed onto a modulator respectively at first and second angles of incidence.

Abstract: An optical relay includes a first lens, a lens module, and a second lens. The first lens is configured to receive modulated light from a first spatial light modulator. The first lens is configured to refract the modulated light into the lens module. The lens module is configured to collimate and focus the modulated light into the second lens. The second lens is configured to refract the modulated light onto a second spatial light modulator.

Abstract: For one embodiment, a reflection is reduced to substantially zero regardless of a wavelength of incident light that produced the reflection.

Abstract: An optical relay comprising a first mirror and a second mirror is provided. The first mirror is configured to receive modulated light from a first spatial light modulator and reflect the modulated light onto the second mirror. The second mirror is configured to reflect the modulated light onto the first mirror, and the first mirror is configured to reflect the modulated light onto a second spatial light modulator.