EXALOS and Fiber Optical Solutions demonstrate a High-Precision Inertial Measurement Unit with Closed-Loop Fiber Optic Gyros – operated by a new 1550nm 3-fiber SLED transceiver
In a joint presentation by EXALOS and customer FIBER OPTICAL SOLUTIONS (FOS) at the 61th DGON ISA symposium, experts from both companies demonstrated a novel integrated 1550 nm 3-fiber SLED transceiver module and its application in a high-precision Inertial Measurement Unit (IMU) for navigation.
The symposium took place in Brunswick (Braunschweig), Germany at October 22-23, 2024, as a face-to-face event.
The broadband SLED emits an optical spectrum with 3dB bandwidth of 33 nm around a center wavelength of 1549 nm. The output is collimated into three output beams that are propagating through an optical circulator before being focused into an array of three PM output fibers. Efficient beam collimation and low-loss beam propagation on the optical bench in combination with high-efficiency coupling to the PM output fibers results in output power values of around 1.0 mW per fiber channel at low drive currents of only 150 mA.
Higher output power values are obtained at higher SLED drive currents. The polarization extinction ratio (PER) of each fiber port provides more than 15 dB.
Three integrated receiver photodiodes detect the returned light from the PM fiber loop of the corresponding FOG. The design provides low transmission loss as well as high isolation and, therefore, high wavelength and power stability against backward-propagating light.
All in all, the low-loss optical architecture in forward and backward direction offers power-efficient operation with low SLED drive currents and thus low TEC currents over the full temperature range from -40°C to +85°C.
This allows the direct splicing to the three phase modulators (MIOC), reducing the number of PM fiber splices to only three:
The joint presentation, which was received with great interest, took place on Wednesday, 23-Oct-24.
Both companies looking forward to further successful cooperation in the development of innovative, market-leading products.
More about Fiber Optical Solutions Ltd., Riga, Latvia: opticalsolution.lv/
More about DGON ISA
The event works as a platform for connecting experts, researchers and applicants of inertial technology covering the full range from sensor development via application development up to integration into products and services.
www.tu-braunschweig.de/iff/dgon-iss-inertial-sensors-and-systems
About EXALOS
EXALOS AG, an Indie Semiconductor company, is manufacturing state-of-the-art SLEDs and LDs in the visible and near-infrared wavelength range for a broad range of industries, including biomedical imaging, fiber optic gyroscopes, interferometry, machine vision, optical sensors, automotive, test equipment or other demanding applications. EXALOS is offering broadband SLED devices at various wavelengths, ranging from 400 nm to 1700 nm. The company has its headquarters in Schlieren, Switzerland.
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EXALOS AG Switzerland is usually referred as “EXALOS” and where applicable it includes EXALOS INC. USA.