3.5 μm optical communication experiment at 100 Mbits−1 using a PbCdS diode laser

Denti, R.; Andrekson, Peter A.; Ahlberg, Henrik; Eng, S. T.

doi:10.1007/bf02199469

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…conversion-induced power loss. One of the earliest explorations of using a direct emitting MWIR source was reported in [79], where a PbCdS diode laser at 3.5 µm was used to transmit 100 Mb/s data. The speed of this work was limited by carrier lifetime.…”

Section: ) Direct Emission Sourcesmentioning

confidence: 99%

Bridging the Terahertz Gap: Photonics-Assisted Free-Space Communications From the Submillimeter-Wave to the Mid-Infrared

Pang

Ozoliņš

Jia

et al. 2022

J. Lightwave Technol.

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Since about one and half centuries ago, at the dawn of modern communications, the radio and the optics have been two separate electromagnetic spectrum regions to carry data. Differentiated by their generation/detection methods and propagation properties, the two paths have evolved almost independently until today. The optical technologies dominate the long-distance and high-speed terrestrial wireline communications through fiber-optic telecom systems, whereas the radio technologies have mainly dominated the short-to medium-range wireless scenarios. Now, these two separate counterparts are both facing a sign of saturation in their respective roadmap horizons, particularly in the segment of free-space communications. The optical technologies are extending into the mid-wave and longwave infrared (MWIR and LWIR) regimes to achieve better propagation performance through the dynamic atmospheric channels. Radio technologies strive for higher frequencies like the millimeter-wave (MMW) and sub-terahertz (sub-THz) to gain broader bandwidth. The boundary between the two is becoming blurred and intercrossed. During the past few years, we witnessed technological breakthroughs in free-space transmission supporting very high data rates, many achieved with the assistance of photonics. This paper focuses on such photonics-assisted freespace communication technologies in both the lower and upper sides of the THz gap and provides a detailed review of recent research and development activities on some of the key enabling technologies. Our recent experimental demonstrations of highspeed free-space transmissions in both frequency regions are also presented as examples to show the system requirements for device characteristics and digital signal processing (DSP) performance.

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Section: ) Direct Emission Sourcesmentioning

confidence: 99%

Bridging the Terahertz Gap: Photonics-Assisted Free-Space Communications From the Submillimeter-Wave to the Mid-Infrared

Pang

Ozoliņš

Jia

et al. 2022

J. Lightwave Technol.

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150 Gbps multi-wavelength FSO transmission with 25-GHz ITU-T grid in the mid-infrared region

Su¹,

Meng²,

Wei³

et al. 2023

Opt. Express

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The 3∼5 µm mid-infrared (mid-IR) light has several exceptional benefits in the case of adverse atmospheric conditions compared to the 1.5 µm band, so it is a promising candidate for optical carriers for free-space communication (FSO) through atmospheric channels. However, the transmission capacity in the mid-IR band is constrained in the lower range due to the immaturity of its devices. In this work, to replicate the 1.5 µm band dense wavelength division multiplexing (DWDM) technology to the 3 µm band for high-capacity transmission, we demonstrate a 12-channel 150 Gbps FSO transmission in the 3 µm band based on our developed mid-IR transmitter and receiver modules. These modules enable wavelength conversion between the 1.5 µm and 3 µm bands based on the effect of difference-frequency generation (DFG). The mid-IR transmitter effectively generates up to 12 optical channels ranging from 3.5768 µm to 3.5885 µm with a power of 6.6 dBm, and each channel carries 12.5 Gbps binary phase shift keying (BPSK) modulated data. The mid-IR receiver regenerates the 1.5 µm band DWDM signal with a power of -32.1 dBm. Relevant results of regenerated signal demodulation have been collected in detail, including bit error ratio (BER), constellation diagram, and eye diagram. The power penalties of the 6th to 8th channels selected from the regenerated signal are lower than 2.2 dB compared with back-to-back (BTB) DWDM signal at a bit error ratio (BER) of 1E-6, and other channels can also achieve good transmission quality. It is expected to further push the data capacity to the terabit-per-second level by adding more 1.5 µm band laser sources and using wider-bandwidth chirped nonlinear crystals.

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Simultaneous Transmission of Multi-Format Signals in the Mid-Infrared Over Free Space

Su,

Xue,

Wang

et al. 2024

Preprint

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3.5 μm optical communication experiment at 100 Mbits−1 using a PbCdS diode laser

Cited by 3 publications

References 8 publications

Bridging the Terahertz Gap: Photonics-Assisted Free-Space Communications From the Submillimeter-Wave to the Mid-Infrared

Bridging the Terahertz Gap: Photonics-Assisted Free-Space Communications From the Submillimeter-Wave to the Mid-Infrared

150 Gbps multi-wavelength FSO transmission with 25-GHz ITU-T grid in the mid-infrared region

Simultaneous Transmission of Multi-Format Signals in the Mid-Infrared Over Free Space

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