GRIN Lens-Coupled Top-Illuminated Photodetectors for High-Power Applications

Joshi, Abhay; Becker, Don

doi:10.1109/mwp.2007.4378124

Cited by 16 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown, the fabricated array is near its 50 ideal and is expected to reach a PCE of 15% with each photodiode operating near saturation (≈55 mA, 3 V) [39]. This 15% maximum PCE for the fabricated array is assuming the responsivity values of 0.12, 0.17, and 0.18 A/W that resulted from an intentional defocusing of the optical beam in an attempt to illuminate the photodiode junction uniformly, as discussed in Section III-C. For future implementations, illumination using a collimated beam should be considered, as it is expected to allow the photodiodes to operate at maximum responsivity without sacrificing saturation performance [65], e.g., a responsivity of 0.50 A/W with a collimated beam would result in a maximum PCE of 30% for the fabricated array. To further increase the PCE, the saturation point of the detectors could be pushed to higher photocurrent via improved thermal management [42], e.g., using diamond as the antenna substrate [48], or manipulation of the optical input can be used, e.g., modulation depth enhancement [48].…”

Section: Antenna Characterizationmentioning

confidence: 99%

Millimeter Wave Photonic Tightly Coupled Array

Carey

Konkol

Shi

et al. 2021

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

We present a tightly coupled array antenna excited by high-power photodiodes for millimeter wave transmit operation. The design includes thinned photodiode substrates for improved bandwidth performance at high frequency combined with the inherently lightweight, low-loss, and direct feeding architecture afforded by the photonic approach. Circuit and full wave simulations are conducted for array design and compared against the traditional electronic arrays in the literature. A prototype 1 × 3 photonic array is developed and characterized to validate the design which achieves a 3 dB (VSWR < 1.4) radiated power bandwidth of 4.6:1 across 13-60 GHz and maintains a 3 dB bandwidth near 4:1 across scan angles up to 30 • . The fabricated array exhibits a 3 dB radiated power bandwidth of 1.8:1 across 30-55 GHz and a maximum measured effective isotropic radiated power of 19.4 dBm at 40 GHz.Index Terms-High-power photodiode, optically fed phased array, RF photonics, tightly coupled array (TCA) antenna, ultrawideband (UWB). I. INTRODUCTIONP HASED array antennas are essential in the development of advanced multifunctional RF systems that serve both commercial and defense sectors. Emphasis in the defense community is placed on the consolidation of RF front ends, signal processing algorithms, and control centers with adaptive subsystems effective for radar and communication [1], [2]. Consolidation of RF front ends with adaptive, multifunctional capabilities requires phased arrays with multioctave operational bandwidths, high transmit power and beam space diversity, frequency agility, scaling potential, and optimal size, weight, and power (SWaP). Similar requirements are of interest in the commercial sector where these benefits can be leveraged in the fifth-generation (5G) cellular communications and mobile networks [3]. Generally, 5G encapsulates the modern trend to continually increase wireless data capacity. Specifically, increasing data capacity ultimately requires increased Manuscript

show abstract

Section: Antenna Characterizationmentioning

confidence: 99%

Millimeter Wave Photonic Tightly Coupled Array

Carey

Konkol

Shi

et al. 2021

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…13d, where absorbed and non-absorbed intrinsic layers are combined, is referred to as dual depletion pin PD [57,58]. Williams [57] compared the performance of dual depletion pin PD with conventional pin PD and UTC-PD based on space-charge and thermal calculations.…”

Section: Carrier Transport Designmentioning

confidence: 99%

High‐power RF photodiodes and their applications

Nagatsuma

Itô

Ishibashi

2009

Laser & Photonics Reviews

150

View full text Add to dashboard Cite

There has been an increasing interest in photonic generation of RF signals in the millimeter-wave (30 GHz ∼ 300 GHz) and/or terahertz-wave (0.1 THz ∼ 10 THz) regions, and photodiodes play a key role in it. This paper reviews recent progress in the high-power RF photodiodes such as UniTraveling-Carrier-Photodiodes (UTC-PDs), which operate at these frequencies. Several approaches to increasing both the bandwidth and output power of photodiodes are discussed, and promising applications to broadband wireless communications and spectroscopic sensing are described.Photodiode chip is bonded to the substrate with the antenna. This is a symbolic figure of RF photonics in this article. Antenna Photodiode Light RF signal

show abstract

“…It is a top-illuminated InGaAs packaged diode that employs an integrated graded-index (GRIN) lens at the end of its coupling fiber, SMF. The GRIN lens shapes the optical beam to produce a more uniform illumination profile (flat-top rather than Gaussian) on the photodiode; this suppresses peak photocurrent density and more effectively illuminates the whole diode [7] [8]. This diode is internally Ω.…”

Section: Test Diodes and Lasermentioning

confidence: 99%

Phase noise in the photodetection of ultrashort optical pulses

Taylor

Quinlan

Hati

et al. 2010

2010 IEEE International Frequency Control Symposium

Self Cite

View full text Add to dashboard Cite

Femtosecond laser frequency combs provide an effective and efficient way to take an ultra-stable optical frequency reference and divide the signal down into the microwave region. In order to convert optical pulses into a usable RF signal, one must use high-speed photodetection; unfortunately, excess phase noise from both technical and fundamental sources can arise in the photodetection process. In order to ultimately minimize the noise effects of the photodetector, we must first characterize some of the known sources for noise arising in these devices. In this paper, we will study two sources of excess noise in high-speed photodiodespower-to-phase conversion and shot noise. The noise performance of each device will give us clues as to the nature of the sources, their effect on the output signal, and what design features of the photodiode minimize these noise effects.

show abstract

GRIN Lens-Coupled Top-Illuminated Photodetectors for High-Power Applications

Cited by 16 publications

References 7 publications

Millimeter Wave Photonic Tightly Coupled Array

Millimeter Wave Photonic Tightly Coupled Array

High‐power RF photodiodes and their applications

Phase noise in the photodetection of ultrashort optical pulses

Contact Info

Product

Resources

About