A Simple NRZ-OOK to PDM RZ-QPSK Optical Modulation Format Conversion by Bidirectional XPM

Wen, Yu-Hsiang; Feng, Kai-Ming

doi:10.1109/lpt.2015.2399917

Cited by 29 publications

(12 citation statements)

References 12 publications

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“…Optical biotelemetries however that employ semiconductor modulated or pulsed lasers as data transmitters and photodiodes (PDs) as data receivers, can provide several desirable features. These include: improved performance particularly in terms of device size, bit rate, BER, power consumption and e.m. compatibility [2], [11]- [15]. Further improvements of optical biotelemetry links have been achieved by increasing transmitter (i.e.…”

Section: Introductionmentioning

confidence: 99%

A 250Mbps 24pJ/bit UWB-inspired optical communication system for bioimplants

Marcellis

Palange

Faccio

et al. 2017

2017 IEEE Biomedical Circuits and Systems Conference (BioCAS)

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This paper presents an optical communication system, implementing a UWB-inspired pulsed coding technique, for emerging high throughput bio-applications such as brain machine interfaces. The proposed solution employs sub-nanosecond laser pulses that, compared to the state-of-the-art, allows for high bit rate transmissions and reduced power consumption. The overall architecture consist of a transmitter and receiver that employ a pulsed semiconductor laser and a small sensitive area photodiode. This can allow for CMOS integration into a compact silicon footprint (estimated lower than 1 mm 2 in a 0.18 µm technology). The analogue circuits presented herein have been implemented using discrete off-the-shelf components. These provide the bias and drive signals for laser pulse generation, photodiode signal detection and conditioning. Moreover, the digital subsystem for data coding and decoding processes have been implemented on a FPGA board through VHDL description language. Experimental results validate the overall functionality of the proposed system using a diffuser between transmitter and receiver to emulate skin/tissue. This shows the capability of operating at bit rates up to 250 Mbps achieving BER less than 10 −9 and power efficiency as low as 24 pJ/bit. These results enable, for example, the transmission of a 1000-channel neural recording system sampled at 16kHz with 16-bit resolution.

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Section: Introductionmentioning

confidence: 99%

A 250Mbps 24pJ/bit UWB-inspired optical communication system for bioimplants

Marcellis

Palange

Faccio

et al. 2017

2017 IEEE Biomedical Circuits and Systems Conference (BioCAS)

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show abstract

“…In the literature, performance has been improved by optimising optical wavelength (to reduce losses), increasing laser power (to improve the signal-to-noise ratio, SNR), applying modulation/encoding schemes (to maximise robustness) and increasing the photodiode active area (to improve link efficiency and also allow some tolerance to misalignment). Previous work has reported data rates up to 100 Mbps with an energy requirement of 21 pJ/bit [16], [41], [50], [51].…”

Section: Introductionmentioning

confidence: 99%

A 300 Mbps 37 pJ/bit UWB-Based Transcutaneous Optical Biotelemetry Link

Marcellis

Stanchieri

Faccio

et al. 2020

IEEE Trans. Biomed. Circuits Syst.

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This paper reports an implantable transcutaneous telemetry for a brain machine interface that uses a novel optical communication system to achieve a highly energy-efficient link. Based on an pulse-based coding scheme, the system uses subnanosecond laser pulses to achieve data rates up to 300 Mbps with relatively low power levels when compared to other methods of wireless communication. This has been implemented using a combination of discrete components (semiconductor laser and driver, fast-response Si photodiode and interface) integrated at board level together with reconfigurable logic (encoder, decoder and processing circuits implemented using Xilinx KCU105 board with Kintex UltraScale FPGA). Experimental validation has been performed using a tissue sample that achieves representative level of attenuation/scattering (porcine skin) in the optical path. Results reveal that the system can operate at data rates up to 300 Mbps with a bit error rate (BER) of less than 10-10 , and an energy efficiency of 37 pJ/bit. This can communicate, for example, 1,024 channels of broadband neural data sampled at 18 kHz, 16bit with only 11 mW power consumption.

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“…Solutions that make use of carrier-based narrow-band and Ultra-wideband (UWB) Radio Frequency (RF) links, employing Impulse Radio (IR) signal modulation, pose significant challenges when requiring high data rates due to their low power efficiency and electromagnetic compatibility [8][9][10][11][12][13]. Optical biotelemetry links, employing semiconductor modulated/pulsed lasers as data transmitters and photodiodes as data receivers, allow the performances of the RF-based systems to be enhanced [4,[14][15][16][17]. In these regards, further improvements have been obtained by increasing the laser power and by using On-Off Keying (OOK) based modulations and large sensitive area photodiodes.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the proposed approach, already investigated in IR-UWB systems [13], implements an optical synchronised-OOK modulation allowing for the clock recovery and a proper synchronisation between the transmitter and the receiver. In general, optical UWB communication systems using modulated/pulsed signals have the advantages of low power spectral density, null RF interference, immunity to multipath fading and high power efficiency, so suitable for short-range wireless links [17][18][19][20]. Based also on these characteristics, the proposed approach allows us to strongly reduce the system overall power consumption and the laser response time reaching data rates up to 128 Mbps with 800 ps laser pulses, a bit period of 7.8 ns and a power efficiency of 35.9 pJ/bit.…”

Section: Introductionmentioning

confidence: 99%

A Pulsed Coding Technique Based on Optical UWB Modulation for High Data Rate Low Power Wireless Implantable Biotelemetry

et al. 2016

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This paper reports on a pulsed coding technique based on optical Ultra-wideband (UWB) modulation for wireless implantable biotelemetry systems allowing for high data rate link whilst enabling significant power reduction compared to the state-of-the-art. This optical data coding approach is suitable for emerging biomedical applications like transcutaneous neural wireless communication systems. The overall architecture implementing this optical modulation technique employs sub-nanosecond pulsed laser as the data transmitter and small sensitive area photodiode as the data receiver. Moreover, it includes coding and decoding digital systems, biasing and driving analogue circuits for laser pulse generation and photodiode signal conditioning. The complete system has been implemented on Field-Programmable Gate Array (FPGA) and prototype Printed Circuit Board (PCB) with discrete off-the-shelf components. By inserting a diffuser between the transmitter and the receiver to emulate skin/tissue, the system is capable to achieve a 128 Mbps data rate with a bit error rate less than 10 −9 and an estimated total power consumption of about 5 mW corresponding to a power efficiency of 35.9 pJ/bit. These results could allow, for example, the transmission of an 800-channel neural recording interface sampled at 16 kHz with 10-bit resolution.

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A Simple NRZ-OOK to PDM RZ-QPSK Optical Modulation Format Conversion by Bidirectional XPM

Cited by 29 publications

References 12 publications

A 250Mbps 24pJ/bit UWB-inspired optical communication system for bioimplants

A 250Mbps 24pJ/bit UWB-inspired optical communication system for bioimplants

A 300 Mbps 37 pJ/bit UWB-Based Transcutaneous Optical Biotelemetry Link

A Pulsed Coding Technique Based on Optical UWB Modulation for High Data Rate Low Power Wireless Implantable Biotelemetry

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