High saturation photocurrent THz waveguide-type MUTC-photodiodes reaching mW output power within the WR3.4 band

Grzeslo, Marcel; Dulme, Sebastian; Clochiatti, Simone; Neerfeld, Tom; Haddad, Thomas; Lü, Peng; Tebart, Jonas; Makhlouf, Sumer; Biurrun-Quel, Carlos; Estevez, Jose Luis Fernandez; Lackmann, Jörg; Weimann, Nils; Stöhr, A.

doi:10.1364/oe.475987

Cited by 19 publications

(6 citation statements)

References 26 publications

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“…The proposed 3-dB frequency response improvement method is to ensure that capacitance effect in an amplifier such as in transimpedance feedback amplifier is reduced. The device effect and stray capacitance are minimized in accordance with the open loop gain [3]- [6], [22]:…”

Section: Bandwidth Enhancement Techniquementioning

confidence: 99%

“…A challenge with typical PIN diode is how to maintain a large capacitive intrinsic region that is acceptable for wireless optical receiver, as illustrated and described with a reasonable solution by Sibley et al [1]- [3]. The main problem of receiver yield is the requirement to have a wide range of capacitive impedance handling at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Composite Bandwidth and Automatic Gain Control Receiver for 6G Wireless Optical Communication

Das,

Agbinya,

Abdullah

et al. 2024

Preprint

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The advent of 6G communication promises a transformative leap in wireless connectivity, ushering in an era of unprecedented data rates, ultra-low latency, and pervasive connectivity. To harness the full potential of 6G networks, it is imperative to address the unique challenges posed by evolving communication environments. In this context, we present a novel framework that integrates Adaptive Composite Bandwidth and Automatic Gain Control (AGC) techniques into the 6G communication paradigm. Optical wireless receivers experience large input current difference due to the large transmitted power, noise from ambient light and the varying efficiencies of different photodiode receivers. With its large dynamic range of µA to mA, transimpedance amplifiers are suitable to handle large variable photodiode efficiencies. The receiver design proposed in this article incorporates two characteristic parameter adjustments, namely bandwidth and automatic gain. By adjusting the bandwidth the signal-to-noise ratio of the incoming signal is automatically controlled. By controlling the bandwidth, the unwanted noise is reduced and amplifier output is liable to low noise and enhances the dynamic range without extra filtering. The automatic gain control adapts its gain based on slight change in the input signal at the receiver front-end. This optimization technique ensures low photo-detection and amplification noise to achieve better quality of service. The results indicate that bootstrap transimpedance amplifier gain is around 53.3 dB and frequency cut-off at 109.7 MHz. Thus, when gain control capacitance is varied between 50 pF to 1 nF, the bandwidth adjustment falls in the range 7.5-104.1 MHz, and the amplifier’s second stage gain becomes 10.4 dB. The overall gain of the proposed configuration with automatic gain control integrated into the transimpedance amplifier increases up to 31.1 dB, while the bandwidth adjusted from 9.4 MHz to 60.7 MHz. In results, gain bandwidth product is optimized from 10.4 dB to 31.1 dB. The main contribution to work is optimizing the product by selecting a capacitance value within the given range that maximizes the GBP. This value will provide the least gain-bandwidth product for effective noise reduction.

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Section: Bandwidth Enhancement Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive Composite Bandwidth and Automatic Gain Control Receiver for 6G Wireless Optical Communication

Das,

Agbinya,

Abdullah

et al. 2024

Preprint

View full text Add to dashboard Cite

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“…top-right). The MUTC-PD design and fabrication details can be found in [41]. To couple the light to the integrated optical waveguide, we use a lensed fibre, as shown in figure 2.b.…”

Section: A Transmitter Setupmentioning

confidence: 99%

180 Gbps Multi-Channel 300 GHz Communications Enabled by Photonically-Driven Low-Barrier Mixers

Belio-Apaolaza,

Martinez-Gil,

Tebart

et al. 2024

Preprint

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Wireless communications at 300 GHz are expected to play an important role in the deployment of 6G and beyond networks. Multiple electronic and photonic technologies compete in this regard, each bringing its own particular benefits. While purely optoelectronic links are interesting for incorporating photonic advantages in signal transmission and reception, electronic receivers typically based on Schottky mixers are far superior in conversion efficiency. Thus, the link signal-to-noise ratio (SNR) is improved, and higher throughput can be achieved. Here, we demonstrate a fully optoelectronic 300 GHz band multi-channel link using a novel low-barrier Schottky mixer driven with a photonically generated local oscillator (LO) signal in the receiver using a modified uni-travelling-carrier photodiode (MUTC-PD). This combines the efficient down-conversion of Schottky-based mixers and the advantages of photonic LO signals such as tuneability, remote generation and distribution, and the reuse of coherent technology used in fibre networks. Up to three frequency channels are generated in the transmitter which is also based on a MUTC-PD photomixer, achieving a maximum aggregated line rate of 180 Gbps over 1.5 m under SD-FEC limit using 16-QAM format and optical intensity modulation. To the best of the authors' knowledge, this is an unprecedented data rate for fully optoelectronic terahertz communications.

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“…The operating frequency can be easily selected by tuning the difference frequency of two tunable laser signals. Recently, InP-based UTC-PDs have exhibited UWB operation beyond 4 THz [13] and promising levels of output power, reaching over +15 dBm at 77 GHz [14], +3.4 dBm at 150 GHz [15], and -0.6 dBm at 240 GHz [16]. However, the conventional packaging technology based on metallic rectangular waveguide (WR) interfaces or antennas limits the operational bandwidth of broadband THz-PDs [7,8,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, InP-based UTC-PDs have exhibited UWB operation beyond 4 THz [13] and promising levels of output power, reaching over +15 dBm at 77 GHz [14], +3.4 dBm at 150 GHz [15], and -0.6 dBm at 240 GHz [16]. However, the conventional packaging technology based on metallic rectangular waveguide (WR) interfaces or antennas limits the operational bandwidth of broadband THz-PDs [7,8,[14][15][16]. On the other hand, although the use of silicon (Si) lenses enables UWB operation for free-space optics [9,13], their large physical size prevents planar integration into compact THz integrated circuits [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wideband Multi-Octave Planar Interconnect for Multi-Band THz Communications

Iwamatsu

Ali²,

Fernández-Estévez

et al. 2023

Preprint

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An ultra-wideband (UWB) interconnect technology using indium phosphide (InP)-based transitions for coupling the output signals from terahertz (THz) photodiodes featuring coplanar waveguide (CPW) outputs to low-loss dielectric rod waveguides (DRWs), is presented. The motivation is to exploit the full bandwidth offered by THz photodiodes without limitations due to standard rectangular waveguide interfaces, e.g., for future high data rate THz communications. Full electromagnetic wave simulations are carried out to optimize the electrical performance of the proposed InP transitions in terms of operational bandwidth and coupling efficiency. The transitions are fabricated on 100-µm thin InP and integrated with silicon (Si) DRWs. Experimental frequency domain characterizations demonstrate efficient THz signal coupling with a maximum coupling efficiency better than -2 dB. The measured 3-dB and 6-dB operational bandwidths of 185 GHz and 280 GHz, respectively, prove the multi-octave ultra-wideband features of the developed interconnect technology. The 6-dB operational bandwidth covers all waveguide bands between WR-12 to WR-3, i.e., a frequency range between 60 and 340 GHz. In addition, the multi-octave performances of the fabricated interconnects were successfully exploited in proof-of-concept THz communication experiments. Using intermediate frequency orthogonal frequency division multiplexing (OFDM), THz communications are demonstrated for several frequency bands using the same interconnect. Considering soft-decision forward error correction, error-free transmission with data rates of 24 Gbps at 80 GHz and 8 Gbps at 310 GHz is achieved.

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High saturation photocurrent THz waveguide-type MUTC-photodiodes reaching mW output power within the WR3.4 band

Cited by 19 publications

References 26 publications

Adaptive Composite Bandwidth and Automatic Gain Control Receiver for 6G Wireless Optical Communication

Adaptive Composite Bandwidth and Automatic Gain Control Receiver for 6G Wireless Optical Communication

180 Gbps Multi-Channel 300 GHz Communications Enabled by Photonically-Driven Low-Barrier Mixers

Ultra-Wideband Multi-Octave Planar Interconnect for Multi-Band THz Communications

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