• Title, Summary, Keyword: waveguide photodetector

Search Result 7, Processing Time 0.033 seconds

High-Speed Traveling-Wave Photodetector with a 3-dB Bandwidth of 410 GHz

  • Park, Jeong-Woo;Han, Sangpil;Lee, Donghun;Ryu, Han-Cheol;Shin, Jun-Whan;Kim, Namje;Yoon, Young-Jong;Ko, Hyunsung;Park, Kyung Hyun
    • ETRI Journal
    • /
    • v.34 no.6
    • /
    • pp.942-945
    • /
    • 2012
  • A high-speed traveling-wave photodetector (TWPD) with an InGaAs absorber is designed and realized. The bandwidth of the TWPD is measured using electro-optic sampling techniques. The bandwidth is 410 GHz, which shows that the RC limitation is overcome. While the TWPD shows a low responsivity of 0.06 A/W at 1,550 nm, this value can be improved through further optimization of the structure without a sacrifice in bandwidth.

Fabrication of Wavelength Division Demultiplexing Photodetectors Using Quantum Well Intermixing (다중양자우물의 상호 섞임 현상을 이용한 다중파장검출기의 제작)

  • Yeo, Deok-Ho;Yoon, Kyung-Hun;Kim Sung-June
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.37 no.9
    • /
    • pp.1-6
    • /
    • 2000
  • Utilizing impurity free vacancy diffusion (IFVD) method, area selective intermixing of InGaAs/InGaAsP multi-quantum well (MQW) structure was done. After this, wavelength division demultiplexing waveguide type photodetectoers was integrated and measured. It showed large blue shift in bandgap due to intermixing of MQW. Photodetectors are based on typical p-i-n structure and devices having large and small bandgap areas line up linearly. Width of waveguide and length of each photodetector are 20 and 250 ${\mu}m$, respectively, TE/TM polarized light from tunable laser was butt-coupled to the photodetector and spectral response was measured. Photodetectors can demultiplexing 1480 and 1550 nm wavelength.

  • PDF

Frequency Response Estimation of 1.3 ㎛ Waveguide Integrated Vertical PIN Type Ge-on-Si Photodetector Based on the Analysis of Fringing Field in Intrinsic Region

  • Seo, Dongjun;Kwon, Won-Bae;Kim, Sung Chang;Park, Chang-Soo
    • Current Optics and Photonics
    • /
    • v.3 no.6
    • /
    • pp.510-515
    • /
    • 2019
  • In this paper, we introduce a 1.3-㎛ 25-GHz waveguide-integrated vertical PIN type Ge-on-Si photodetector fabricated using a multi-project wafers service based on fringing field analysis in the depletion region. In general, 1.3-㎛ photodetectors fabricated using a commercial foundry service can achieve limited bandwidths because a significant amount of photo-generated carriers are located within a few microns from the input along the device length, and they are influenced by the fringing field, leading to a longer transit time. To estimate the response time, we calculate the fringing field in that region and the transit time using the drift velocity caused by the field. Finally, we compare the estimated value with the measured one. The photodetector fabricated has a bandwidth of 20.75 GHz at -1 V with an estimation error of <3 GHz and dark current and responsivity of 110 nA and 0.704 A/W, respectively.

A Study on a Compact Coupler between an Optical Fiber and a Grating-assisted Graphene-embedded Silicon Waveguide for a Wavelength-selective Photodetector

  • Heo, Hyungjun;Kim, Sangin
    • Current Optics and Photonics
    • /
    • v.1 no.5
    • /
    • pp.514-524
    • /
    • 2017
  • We proposed an integrated wavelength-selective photodetector based on a grating-assisted contradirectional coupler and a graphene absorption layer for a coarse wavelength division multiplexing (CWDM) communication system. The center wavelength of the absorption spectrum of the proposed device can be tuned simply by changing the period of the grating, and the proposed device structure is suitable to forming a cascaded structure. Therefore, an array of the proposed device of different grating periods can be used for simultaneous wavelength demultiplexing and signal detection in a CWDM communication system. Our theoretical study showed that the designed device with a grating length of $500{\mu}m$ could have an absorption of 95.1%, an insertion loss of 0.2 dB, and a 3 dB bandwidth of 7.5 nm, resulting in a -14 dB crosstalk to adjacent CWDM channels. We believe that the proposed device array can provide a compact and economic solution to receiver implementation in the CWDM system by combining functions of wavelength demultiplexing and signal detection.

Cost Effective Silica-Based 100 G DP-QPSK Coherent Receiver

  • Lee, Seo-Young;Han, Young-Tak;Kim, Jong-Hoi;Joung, Hyun-Do;Choe, Joong-Seon;Youn, Chun-Ju;Ko, Young-Ho;Kwon, Yong-Hwan
    • ETRI Journal
    • /
    • v.38 no.5
    • /
    • pp.981-987
    • /
    • 2016
  • We present a cost-effective dual polarization quadrature phase-shift coherent receiver module using a silica planar lightwave circuit (PLC) hybrid assembly. Two polarization beam splitters and two $90^{\circ}$ optical hybrids are monolithically integrated in one silica PLC chip with an index contrast of $2%-{\Delta}$. Two four-channel spot-size converter integrated waveguide-photodetector (PD) arrays are bonded on PD carriers for transverse-electric/transverse-magnetic polarization, and butt-coupled to a polished facet of the PLC using a simple chip-to-chip bonding method. Instead of a ceramic sub-mount, a low-cost printed circuit board is applied in the module. A stepped CuW block is used to dissipate the heat generated from trans-impedance amplifiers and to vertically align RF transmission lines. The fabricated coherent receiver shows a 3-dB bandwidth of 26 GHz and a common mode rejection ratio of 16 dB at 22 GHz for a local oscillator optical input. A bit error rate of $8.3{\times}10^{-11}$ is achieved at a 112-Gbps back-to-back transmission with off-line digital signal processing.

Effect of the transit time on the characteristics of 1.55 $\mu\textrm{m}$ traveling - wave waveguide photodetector (전이 시간이 1.55$\mu\textrm{m}$ 진행파형 광 검출기의 특성에 미치는 영향)

  • 이정훈;공순철;이승진;최영완
    • Proceedings of the Optical Society of Korea Conference
    • /
    • /
    • pp.12-13
    • /
    • 2000
  • 진행파형 광 검출기는 전기적으로 분포된(distributed) 구조이므로, 그 대역폭은 RC 시정수에 의해 제한되기보다는 광 흡수계수와 광과 마이크로파 사이의 진행속도 차에 의해 제한된다$^{(1)(2)}$ . 진행파형 광검출기에서 광과 마이크로파 사이의 속도 부정합이 대역폭에 미치는 영향은 속도 부정합 임펄스 반응(velocity-mismatch impulse response)의 제시를 통해 이미 분석되었다$^{(1)(2)}$ . 그러나, 대역폭에 제한에 큰 영향을 미칠 것이 예상되는 진성 흡수 영역에서의 전송자 표류 시간은 아직 구체적으로 고려되지 않았다. 본 논문에서는 진성 흡수영역에서의 전송자 표류 시간을 고려하였다. 그 전이 시간(transit time)을 고려하기 위해 속도 부정합 임펄스 반응을 수정하여 제시하였다. 새로히 제시된 임펄스 반응은 광 도파로 해석과 진성 영역 분할에 의해 모델화 되었으며, 이 임펄스 반응을 통해 전이 시간과 속도 부정합이 대역폭에 미치는 영향을 살펴보았다. (중략)

  • PDF