Abstract: Methods, systems, and computer readable for providing smart underwater free space optical communications are provided. According to one aspect, a system for smart underwater free space optical communications is provided. The system includes a receiver. The receiver includes an optical detector array for detecting incident light under water. The receiver further includes a compound lens array located optically in front of the optical detector. The compound lens array includes lenses that steer incident light arriving at different angles to different portions of the optical detector array. A controller processes signals generated by the optical detector based on the incident light and controls an aspect of the underwater communications based on the steered incident light detected by the detector array.

Abstract: An optical receiver includes an optical detector that is positioned to detect an optical data signal received from an optical channel generates a received electrical data signal at an output. An electrical switch passes one of the received electrical data signal and a second electrical signal depending upon a control signal applied to a control input. A data and clock recovery circuit generates a recovered clock and a recovered data signal when a signal-to-noise ratio of the received electrical signal is in a range where a signal locking condition is established, and generates the control signal at the control output that instructs the electrical switch to select the received electrical data signal if the signal locking condition is established and to select the second electrical signal if the signal locking condition is not established.

Abstract: Lighting and control systems and methods for a lighting node and a remote control device are disclosed. The remote control device may be coupled to the lighting node via an identification process, such as broadcasting an identification request from the remote control device to nearby lighting nodes. The lighting node can respond to the identification request by sending an identifier to the remote control device such that future commands sent from the remote control device is limited to be responded by the lighting node having the identifier stored thereon. Once coupled, the remote control device can adjust spectral content produced by the lighting node based on user-configuration or a color profile captured via an optical sensor. The adjustment via the remote control device may further include calibration and recalibration of the lighting node utilizing a feedback mechanism with the optical sensor.

Abstract: Provided are a method and a system for the correction of an optical satellite image, the method including: a first step in which a satellite image judgment unit inputs and receives a plurality of satellite images divided according to spectral information and judges whether or not some area is a missing satellite image; a second step in which when the satellite image judgment unit judges that the some areas is the missing satellite images, a first interpolation unit inputs and receives the plurality of satellite images and carries out one-dimensional interpolation for each satellite image; a third step in which a second interpolation unit carries out two-dimensional interpolation for each satellite image in which the one-dimensional interpolation is carried out; and a fourth step in which a satellite image composing unit composes a corrected satellite image by gathering each satellite image in which the two-dimensional interpolation is carried out.

Abstract: Systems and methods are provided for device playback calibration. In one example, a calibration device with a microphone and signal processor may detect audio content rendered by a playback device. The calibration device may transmit the detected audio content to a processing unit configured to determine an equalization setting for optimal playback of the playback device based on the received detected audio content and a relative distance and direction between the playback device and the calibration device. The calibration device may further be configured to modulate the detected audio content before transmitting the detected audio content to the processing unit to accommodate for a limited frequency range of the processing unit. In this case, the processing unit may demodulate the received signal prior to determining the equalization setting. The processing unit may then transmit the determined equalization setting to the playback device according to a wireless communication protocol.

Abstract: A wireless light communication system and method using a plurality of light transmitting units driven by a same alternating current (AC) power, and a light receiving unit for receiving optical signals transmitted by the plurality of light transmitting units are provided. The wireless light communication method includes setting a channel for each of the plurality of light transmitting units such that light transmitting units having an overlapping area that is reachable by optical signals use different channels, detecting zero crossing of the AC power, synchronizing channels by using the detected zero crossing, and transmitting an optical signal through the set channel by using the plurality of light transmitting units, and receiving the optical signal transmitted by each of the plurality of light transmitting units by using the light receiving unit, and analyzing information included in the received optical signal.

Abstract: A satellite test signal reflection apparatus for testing transmitters sending out optical signals, the apparatus includes a plate that is at least partially permeable to optical signals. The plate has a base with a first surface with a residual reflective coating and a second surface. The residual reflective coating is configured to split an optical beam, which penetrates the plate in a first direction from the first surface to the second surface, into a reflective optical beam and a transmitted optical beam.

Abstract: A gearbox IC is incorporated into an optical communications system to enable an optical link that incorporates the system to achieve data rates that are at least double that which are currently achievable in optical links. The gearbox IC performs data rate conversion and phase alignment. In the transmit direction, the gearbox IC receives N lanes of electrical data signals having a data rate of X Gbps and outputs N/2 lanes of electrical data signals having a data rate of 2X Gbps. In the receive direction, the gearbox IC receives N/2 electrical data signals having a data rate of 2X Gbps and converts the N/2 electrical data signals into N electrical data signals having a data rate of X.

Abstract: A system comprises a transmitter including a laser configured to generate a laser beam directed at a spot on a surface, and a laser driver connected to the laser and configured to modulate input data onto the laser beam. The system may further comprise a receiver including an optical detector configured to decode received light into raw data, a signal processor configured to decode the raw data into the original input data, and telescope optics configured to receive light reflected from the spot on the surface, collimate the light and converge the light onto the optical detector.

Abstract: Embodiments of the present invention are directed to a system and method for indoor wireless optical communication. The system may include a central unit and a plurality of user units. A bi-directional optical communication link may be established over a collimated invisible light beam to enable transmission of wireless communications between a remote communication device and a user unit. The central and user units include an optical transmitter. At least one of the user unit and the central unit comprises a visible light source configured to produce a collimated visible light beam to enable alignment of the user unit and the central unit upon establishment of the bi-directional optical communication link.

Abstract: Disclosed is an image reading controller including an output unit that outputs plural control signals for controlling turning on and off of a light emitting unit of an image reading unit including the light emitting unit and a light receiving unit on respective transmission paths, the plural control signals satisfying at least one of a first condition that respective transmission paths are separated from each other by a predetermined distance or more and a second condition that types of the respective transmission paths are different from each other; and a controller that controls turning on and off of the light emitting unit on the basis of the plural control signals output from the output unit and input through the respective transmission paths.

Abstract: A lighting node is described. One embodiment of the lighting node includes a lamp, a radio device, and a memory. The lamp is configured for generating illumination. The radio device is configured for radio communication. The radio device is configured to remotely receive a color profile from the controller. The lamp is also configured to generate illumination to substantially match the received color profile. The memory is configured to store a group identifier for the lighting node.

Abstract: A system, method, and optical communication device are disclosed. The system can include a plurality of optically coupled nodes forming an optical communication network. Each node may include an array of pixel elements, each pixel element having an optical detector and an active optical source. The pixel array may be disposed in a backplane of a lens that is configured to map incoming optical signals to pixel locations in the backplane according to their respective angles of incidence and to minimize a deviation at each pixel location between incoming optical signals arriving at the optical detector and emissions from the optical source. The node may include a processor and memory. The processor can register senders in the optical network at locations in the pixel array and can generate routing information by which to route communications from the registered senders to other pixel elements for transmission to their respective destinations.

Abstract: Methods and systems are provided for extending the range that a laser can transmit data, particularly in environments with high attenuation or turbidity. Particularly, an energy storing laser that is capable of continuously converting electrical energy to optical energy and storing the optical energy or the electrical energy in the energy storing laser until the energy storing laser is instructed to transmit a laser transmission. In some embodiments, the energy storing laser uses a pulse train with a low duty cycle to increase the peak power of each laser pulse. Also, a pointing and tracking system is used to provide a communication link between stationary platforms or moving vehicles.

Abstract: An optical transceiver may include an optical fiber coupling assembly for coupling optical fibers to transmitter and receiver sub-assemblies to increase the number of usable channel wavelengths by reducing an incident angle on a WDM filter without causing unwanted back reflection to a laser. In one example, the optical fiber coupling assembly may be used to increase the number of usable channel wavelengths between the L-band and the C-band. The optical transceiver may be used, for example, in an optical line terminal (OLT) and/or optical networking unit (ONU) in a wavelength division multiplexed (WDM) passive optical network (PON) capable of transmitting and receiving optical signals on multiple channel wavelengths.

Abstract: A method and an apparatus are for directing an optical receiver toward a light source, using a plurality of light detectors arranged around the receiver's optical axis to check where light (L) hits the light detectors relative to the optical axis. The method includes the steps of: A) arranging the receiver defocused to embrace a largest possible field of view of the area wherein the light source may be located, and refracting the light with largest possible spread angle; B) letting the receiver search for the light source until the light (L) hits at least one of the light detectors; C) calculating where the light hits relative to the optical axis, and adjusting the receiver, directing the light toward the optical axis; D) reducing the field of view embraced by the receiver; and E) repeating the steps C and D until the light is concentrated in a smallest possible area.

Abstract: A handheld device includes: a transmitter or receiver of a signal beam for quantum key distribution; and a source of alignment beams that diverge from each other in a pattern that matches sensors on a station containing a receiver or transmitter for the quantum key distribution. The alignment beams from the handheld device are of sufficient intensity to produce on the station visible spots that facilitate manual alignment of the handheld device. The station can measure a position and a direction of respective alignment beams and dynamically steer the signal beam according to the measurements.

Abstract: An automatic angle adjustment unit (70) engages with and drivers a horizontal adjustment-engagement member (33) and a vertical adjustment-engagement member (37) of an object detection device (D) from the exterior. The unit (70) includes: engagement-drive transmission sections (72 and 73) which removably engages with both adjustment-engagement members (33 and 37), from the front surface, and drives both adjustment-engagement members (33 and 37); clamping section (76) that is removably secured to the object detection device (D); and an adjustment unit control section (80) for performing a control for adjusting a horizontal angle and a vertical angle of an optical system, based on a detection signal level.

Abstract: Examples and implementations of reconfigurable sensors in a sensor array for performing various reconfigurable sensing functions.

Abstract: A method including directing a first radiation at a first copper-indium-gallium (CIG) sputtering target in a reactive copper indium gallium selenide (CIGS) sputtering process, detecting a first reflected radiation from the first CIG target and determining the amount of selenium poisoning of the first CIG target based on the first reflected radiation.

Abstract: A method for correcting for optical channel bandwidth misalignment between output passbands of a first optical device and input passbands of a second optical device. The method may involve transmitting a plurality of optical signals from the output passbands of the first optical device, with each of the optical signals being transmitted within an associated one of the passbands of the output. The first plurality of optical signals may be received within the input passbands of the second optical device. The optical signals may be analyzed to determine if the passbands of the first optical device or the second optical device has shifted. A characteristic of a filter through which the optical signals pass may be altered to cause a needed degree of shifting of wavelength bands of the optical signals to bring the optical signals into alignment within the passbands of the second optical device.

Abstract: A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path coupled to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network.

Abstract: The invention relates to base stations in communication networks. In more particular the invention relates to cellular base stations such as 3G/4G and WLAN base stations. Some or all of the aforementioned advantages of the invention are accrued with a fully photonic base station (200) that powers itself with solar photons, provides radio network access and relays an optical photonic beam (220, 221, 230, 231) through air encoded with the data from radio signals of computer users and mobile phone users to the Internet and the global telecommunication network. A system engineer can build a network with the inventive base stations in a matter of days. He simply walks to the roof of houses and points the optical beams to other base stations in adjacent houses.

Abstract: A system for bi-directional data transmission includes a first array coupled to a first subsystem and a second array coupled to a second subsystem. The first array includes a first plurality of transmitters that produce first optical signals that are transmitted through free space, and a first plurality of receivers. The second array includes a second plurality of transmitters that produce second optical signals that are transmitted through free space to the first plurality of receivers, and a second plurality of receivers that is configured to receive the first optical signals. An image-forming apparatus is operatively positioned between the first and second arrays and is configured to concurrently form an image of the first plurality of transmitters on the second plurality of receivers and an image of the second plurality of transmitters on the first plurality of receivers.

Abstract: The system provides a mobile, full bi-directional, free-space optical (FSO) network providing networkability and internet connectivity. Each mobile system has a FSO transceiver communicating via line-of-sight (LOS) with a stationary FSO transceiver. Alternatively, the mobile system communicates with a relay FSO transceiver that is in contact with another relay and/or a stationary FSO transceiver. The system has diversity of wavelengths through a multi- wavelength system operating predominately in the infrared spectrum. The network is directionally constrained by the optical components to reduce interference with other networks. Pointing, acquisition, and tracking (PAT) of the network optical signal generator and receivers assists optical performance.

Abstract: An optical transceiver assembly comprises a transmission system, a reception system and a coupling system which directs a part of the signals produced by the transmission system to the reception system. Said part of the transmission signals is detected by a photodetector matrix of the reception system, outside an useful zone of the matrix which is dedicated to the detection of the received signals. A transmission direction may therefore be determined in real time while the received signals are detected. A difference between the transmission direction and a reception direction of the transceiver assembly may then be precisely compensated for at each moment during a tracking step. The transceiver assembly may be a free space laser optical communication terminal.

Abstract: An optically-connected system is disclosed for exchanging data among industrial automation devices, that is composed of a plurality of connection modules, where each module comprises at least two pairs of optical transmitters and receivers on the main side, and one optical receiver on the opposing main side, that are opposite with respect to another pair of transmitters and receivers in a following module; and where each one of the transmitters and receivers is adapted to communicate with industrial automation devices to cooperate for exchanging data between modules, sending one interrogation signal requesting an identity of the module and the receiver is adapted to send to each corresponding response signal containing characteristics of the receiver.

Abstract: A visible light multiplex communication system is presented which includes identification (ID) information and data information which can be simultaneously transmitted and received to and from a server and a plurality of clients by using visible light. Visible light ID communication and visible light data communication do not interfere with each other in the same space during visible light communication. In addition, data can be efficiently transmitted and received to and from a plurality of ID clients using visible light. In addition, visible light ID communication and visible light data communication can be efficiently performed in a state where interference between clients using different protocols does not occur in the same place. Furthermore, a specific unit that is capable of efficiently transmitting and receiving data to and from a plurality of clients by using visible light can be provided.

Abstract: An alignment system for coupling a component to a vehicle includes at least one sensor target coupled to the component, and a controller assembly configured to transmit a signal towards the sensor target and receive a reflected signal from the sensor target, wherein the controller assembly is configured to output an orientation dataset for the component relative to the vehicle using the reflected signal. The system also includes a processing device communicatively coupled to the controller assembly, wherein the processing device is programmed to translate the orientation dataset and cause a set of component positioning signals based on the orientation dataset to be displayed at a user interface.

Abstract: Methods and apparatus for target identification are disclosed. An example method for target identification disclosed herein comprises establishing an optical communication link with a potential target, transmitting a first signal encoded with a first code to the potential target using the optical communication link, receiving a second signal from the potential target using the optical communication link, extracting a second code from the second signal, and identifying the potential target as a friendly asset based on the second code.

Abstract: A network device includes a substitutor and a transmitter. The substitutor receives input columns of concurrently received input symbols. Each of the input columns includes one input symbol from each of a plurality of parallel input lanes. The substitutor generates output columns corresponding to the input columns, wherein each of the output columns includes one output symbol for each of a plurality of parallel output lanes. The substitutor replaces the output symbols of a selected column of the output columns with alignment symbols. The selected column is immediately followed by a second column, and the second column is immediately followed by a third column. The substitutor replaces the output symbols of the second column with disposable symbols, and replaces the output symbols of the third column with boundary symbols. The transmitter drives data onto a communications medium in response to the output symbols generated by the substitutor module.

Abstract: Methods and apparatuses for enabling detection of a modulated optical source involve one or more modulated optical signals shifted, i.e., demodulated optically, to one or more base band signals that are detectable by one or more low-frequency detectors.

Abstract: A method and apparatus are present for managing a transmission of photons. The number of parameters for transmitting the photons as a beam in a liquid are identified using a number of characteristics of the liquid to form a number of selected parameters. The photons are transmitted in the liquid as the beam to a target using the number of selected parameters to form the transmission of the photons.

Abstract: A system comprises a transmitter including a laser configured to generate a laser beam directed at a spot on a surface, and a laser driver connected to the laser and configured to modulate input data onto the laser beam. The system may further comprise a receiver including an optical detector configured to decode received light into raw data, a signal processor configured to decode the raw data into the original input data, and telescope optics configured to receive light reflected from the spot on the surface, collimate the light and converge the light onto the optical detector.

Abstract: A voice-activated command and control system for remotely-controlled vehicles includes a voice-activated control module, a microphone, and a verbal or visual feedback indicator such as a speaker. The operator speaks instructions into the microphone to activate control functions on the vehicle. Confirmation of receipt and/or status of the verbally commanded instructions are sent back to the operator such as spoken through the speaker. The microphone and speaker can be implemented, for example, either in a headset (with a microphone and earphones) worn by the operator, or in the hand-held controller for the vehicle. The system can be alternately implemented without the speaker or other feedback element.

Abstract: A method for generating a visible signal for a data transmission frame in a visible-light communication system includes: receiving specific data constituted by a plurality of frames from a sender; checking and converting a received signal strength indication (RSSI) signal measured from the sender; whenever each frame of the specific data is consecutively received, checking the converted RSSI, determining a level of a visible signal for distinctively displaying a state of a corresponding communication channel, and transmitting the level of the visible signal to the sender; and when reception of the specific data has finished, transmitting a corresponding response message to the sender, according to whether the specific data has been successfully received.

Abstract: Devices and systems are provided for free space optical communication using optical films. Some embodiments involve using an optical film for the transmission and/or reception of light in a free space optical communication system. Some free space optical communication systems may involve devices, such as laptop computers, desktop computers, mobile communications devices, etc., that are configured for communication via an optical film. The optical film may be disposed on a device, on a wall, a window, furniture, etc., according to the implementation. Many types of free space optical communication systems are provided, including line of sight and non line of sight free space optical communication systems.

Abstract: In accordance with an aspect of the invention, a system has a transmitter and a receiver, where the transmitter includes a beam source and an optical element. The beam source produces a beam that represents information, and the optical element alters the beam so that the beam has a uniform intensity over a cross-sectional area. The receiver is separated from the transmitter by free space through which the beam propagates and includes an active area positioned to receive a portion of the beam that the receiver converts into a received signal. To accommodate possible misalignment, the cross-sectional area of the beam is larger than the active area by an amount that accommodates a range of misalignment of the receiver with the transmitter.

Abstract: For each path in a first plurality of paths in said communication network, a respective first weighted path length is determined based at least in part on a number of pure wireless links in the path. From among the first plurality of paths, a second plurality of paths having first weighted path lengths less than a threshold value is selected. For each path in the second plurality, a respective second weighted path length is determined based at least in part on a number of pure optical links in the path, and from among the second plurality of paths, a transmission path is selected having a highest second weighted path length. Information is transmitted via the transmission path.

Abstract: A transmission device includes a first light emission unit having a light source for emitting one optical signal. A reception unit includes an X-Y address system image sensor, having a pixel region including a plurality of pixels, for receiving the optical signal by the pixel region; a classification unit for creating classification information representing a pixel group including pixels, among the plurality of pixels, which are irradiated with the optical signal; and a control unit for controlling the X-Y address system image sensor in accordance with the classification information to simultaneously read signals of the pixels belonging to the pixel group.

Abstract: An optical system for remotely optical communications at a high data rate between a base station and a remote station under atmospheric turbulence conditions is disclosed. The remote station includes an entirely different type of retroreflector that does not use the conventional type of retroreflection, but instead consists of two sets of lenslets coupled with single-mode fiber array, called fiber “retro”. Amplified retromodulation is achieved requiring only one single optical amplifier and one single modulator. A transmitter located at the base station sends an interrogating optical beam to the fiber “retro” which modulates the optical beam according to the input signal/data, and redirects the modulated optical beam to the base station for detection by a receiver. The present invention includes the capabilities of providing Identification of Friend-or-Foe (IFF), secure communication, and a means of achieving a wide field-of-view (FOV) with a fiber-coupled lenselet array.

Abstract: A transmitter including a plurality of input lanes, a substitutor module, and an interleaver module. The plurality of input lanes is configured to receive input symbols including data symbols and idle symbols, wherein the input symbols are arranged into columns of concurrently received input symbols, and wherein each of the columns includes one input symbol from each of the plurality of input lanes. The substitutor module is configured to, at intervals, replace one of the columns with a column of alignment symbols. The substitutor module is further configured to replace an immediately subsequent one of the columns with a column of disposable symbols; and replace one or more immediately subsequent ones of the columns with columns of boundary symbols uninterrupted by disposable symbols. The interleaver module is configured to interleave symbols from the substitutor module between a first transmit lane and a second transmit lane.

Abstract: Method and system for determining a point-ahead angle from a first spacecraft to a second spacecraft, each spacecraft having a laser communication (“lasercom”) terminal is provided If ephemeris data regarding the second spacecraft is unavailable to the first spacecraft while the second spacecraft is mobile, (a) obtaining attitude information regarding the first spacecraft; and (b) obtaining gimbal offload commands from a fast steering mirror and a first spacecraft telescope subsystem of the first spacecraft; wherein a point-ahead determination module receives the attitude information and the gimbal offload commands; and determining an estimate of the point-ahead angle from the first spacecraft to the second spacecraft based on the attitude information and the gimbal offload commands.

Abstract: A wireless communication interface for a portable wireless terminal and a system for wirelessly communicating by a portable wireless terminal with another device via a free space. The interface facilitates aligning the portable wireless device with another devices for improved communication. The interface including: a light source for generating a data-modulated visible light signal and outputting the visible light signal to the free space; an optical detector for generating an electrical signal by photoelectrically converting the visible light signal input from the free space, and for outputting the electrical signal. A demodulation unit demodulates the electrical signal input from the optical detector, and outputs a data signal.

Abstract: A method and system are provided for aligning the optic port of a device having a Free Space Optics (FSO) connector. In a link device with an FSO connector, a controller determines that an optic port alignment procedure is required. A lens is set to an initial wide beam dispersion mode, and a mirror is set to an initial position angle. Note: the lens and mirror may be the FSO connector receive path or transmit path. An optical signal is communicated at a first low baud rate, and the first baud rate communications are optimized by iteratively adjusting the mirror and narrowing the lens focus. Then, an optical signal is communicated at a second baud rate, faster than the first baud rate, and the second baud rate communications are optimized by iteratively adjusting the mirror and narrowing the lens focus.

Abstract: Disclosed are methods, devices, and systems for exchanging information between a first wearable electronic device and one of a second wearable electronic device and an account at a remote computing device associated with a user of the second wearable electronic device. The first wearable electronic device intermittently emits directed electromagnetic radiation comprising a beacon signal, and receives, via a receiver coupled to the first wearable electronic device, a signal from the second wearable electronic device identifying one of the second wearable electronic device and the account at the remote computing device. An input may then be detected at the first wearable electronic device, and in response to receiving the signal and detecting the input, the first wearable device may transmit additional data to one of the second wearable electronic device and the remote computing device associated with the second user.

Abstract: A system including a device equipped with a reception section, a reception condition detection section and a control section. A partner device emits laser light and modulates the laser light in accordance with transfer subject information. Relative positions of the partner device and the device are adjusted to a communication-possible position, at which the laser light from the partner device is incident in a light reception region of the device. In this state, the reception section receives the transmission subject information from the partner device by detecting the incident laser light and demodulating the transmission subject information therefrom. The reception condition detection section detects a deterioration in a reception condition. If a deterioration in the reception condition is detected, the control section produces a warning or stops emissions of laser light from the partner device.

Abstract: A free space optical communication system incorporates a kinematic sensor, such as an accelerometer, proximate an optical signal generator or emitter, such as a laser. Kinematic information generated using an output signal from the kinematic sensor is encoded along with a time signal and transmitted from the sending node to a receiving node. The receiving node receives the kinematic information and determines a future position and orientation of the sending node. The receiving node makes adjustments to receiving optical component hardware in order to better receive the signal based upon the acceleration data and the time signal.

Abstract: The present invention relates to a multipurpose infrared apparatus and a display apparatus thereof. The display apparatus includes a display panel and the multipurpose infrared apparatus, wherein the multipurpose infrared apparatus includes an infrared light emitted diode (hereinafter refer to as, IR LED) transmitter, an IR receiver and a microcontroller. The IR LED transmitter is used for transmitting infrared ray. The IR receiver is used for receiving infrared ray. The microcontroller utilizes the Time-Division Multiplexing method to control the IR LED transmitter and receiver to achieve the distance detecting, the remote control signal receiving and an ambient light detecting.

Abstract: An optical transceiver is provided with a light pipe that intercepts, offsets and redirects a portion of the collimated transmit beam to create a virtual object in the receiver field-of-view to perform the BIT. The light pipe comprises an input face and first reflective surface in the transmitter FOV to intercept a portion of the beam along a first axis and re-direct the beam, a second reflective surface and output face in the receiver FOV that re-directs the portion of the beam along a second axis towards the receiver to create the virtual object in the receiver FOV and an optical channel that guides the redirected portion of the beam from the first reflective surface to the second reflective surface to offset the second axis from the first axis. The same detector used during normal operation of the transceiver is used to perform the BIT, which may include a simple “on/off” test or a radiometry test.