We have developed a 4 × 25 Gb/s ROSA (receiver optical sub-assembly) module for 100G Ethernet optical transceiver. This ROSA module has very large alignment tolerance of more than ± 250 µm between the optical DMUX (demultiplexer) and four photodiodes, for the reason it has the advantage of being easily assembled. The large alignment tolerance can be attributed to the dimensional tolerant optical DMUX, which is composed of four thin film filters attached to a parallelogram-shaped optic block. Since it is important to define the fabrication specifications for the dimension of the optic block, we analyze dimensional tolerance for the optic block using three-dimensional simulation. This parallelogram-shaped optical DMUX permits length tolerance of ± 300 µm and angular tolerance of ± 0.1°. The fabricated optical DMUX is estimated to have the angular error of less than 0.09°.
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- Weakly coupled mode-division-multiplexing (MDM) systems using intensity modulation and direct detection (IM-DD) have the potential to enhance the capacity of short-reach optical links but face challenges due to modal crosstalk and bandwidth limitations.
- The study presents a high-speed MDM IM-DD system that employs a degenerate mode diversity receiver with high-bandwidth single-mode photodetectors and low-crosstalk multiplexing/demultiplexing over a specialized few-mode fiber.
- Results demonstrate successful transmission at 112-GBaud with advanced modulation schemes, achieving over 6.4Tb/s net rate, indicating the system's viability for high-speed optical interconnections.
We have developed a 4 × 25 Gb/s ROSA (receiver optical sub-assembly) module for 100G Ethernet optical transceiver. This ROSA module has very large alignment tolerance of more than ± 250 µm between the optical DMUX (demultiplexer) and four photodiodes, for the reason it has the advantage of being easily assembled. The large alignment tolerance can be attributed to the dimensional tolerant optical DMUX, which is composed of four thin film filters attached to a parallelogram-shaped optic block.
View Article and Find Full Text PDFTemperature sensitivity of passive holographic wavelength-division multiplexers-demultiplexers.
Appl Opt
August 2000
Department of Electrical and Computer Engineering, University of Texas, Microelectronics Research Center, Austin, Texas 78758, USA.
We derive a set of concise formulas to characterize the temperature sensitivity of holographic wavelength-division multiplexers-demultiplexers (H-MUX's-H-DMUX's). The normalized parameters such as dispersion abilities, central wavelength shift rate, and variations of insertion loss hold for general grating-based wavelength-division multiplexing-demultiplexing (WDM-WDDM) structures. The results are applicable to both wide-WDM-WDDM and dense ones working in 800-, 1300-, and 1550-nm optical wavelength windows, regardless of whether their input-output ports are single-mode or multimode fibers.
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