- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2019 IEEE International Conference on Space Optical Systems and Applications (ICSOS) - Portland, OR, USA (2019.10.14-2019.10.16)] 2019 IEEE International Conference on Space Optical Systems and Applications (ICSOS) - Real Time Photon-Counting Receiver for High Photon Efficiency Optical Communications
摘要： We present a scalable design for a photon-counting ground receiver based on superconducting nanowire single photon detectors (SNSPDs) and field programmable gate array (FPGA) real-time processing for applications to space-to-ground photon starved links, such as the Orion EM-2 Optical Communication Demonstration (O2O) [1], and future deep space or low transmitter power missions. The receiver is designed to receive a serially concatenated pulse position modulation (SCPPM) waveform [2], which follows the Consultative Committee for Space Data Systems (CCSDS) Optical Communications Coding and Synchronization Red Book standard [3]. The receiver design uses multiple individually fiber coupled, 80% detection efficiency commercial SNSPDs in parallel to scale to a required data rate, and is capable of achieving data rates up to 528 Mbps. For efficient fiber coupling from the telescope to the array of parallel detectors that can be scaled both to telescope aperture size and the number of detectors, we use either a single mode fiber (SMF) photonic lantern or a few-mode fiber (FMF) photonic lantern [4]. In this paper we give an overview of the receiver system design, the characteristics of the photonic lanterns, the performance of the SNSPDs, and system level tests. We show that 40 Mbps can be received using a single SNSPD, and discuss aspects for scaling to higher data rates.
关键词： few-mode fibers,superconducting nanowire,optical communications,single photon detectors
更新于2025-09-19 17:13:59
-
Efficient Mode Multiplexer for Few-Mode Fibers Using Integrated Silicon-on-Insulator Waveguide Grating Coupler
摘要： We propose a novel and highly efficient multimode waveguide grating coupler which can simultaneously launch four channels including two polarizations of the linear polarized (LP) modes, LP01 and LP11 of a step-index few-mode fiber (FMF). The waveguide grating coupler on the silicon-on-insulator (SOI) platform is based on a subwavelength structure which was optimized using the genetic optimization approach with 2-dimensional finite-difference time-domain (2-D FDTD) simulations combined with the second?order effective medium theory (EMT). Simulations predicted the coupling efficiencies to be ?4.3 dB for LP01 mode and ?5.0 dB for the LP11 mode. The design was fabricated in a multi-project wafer (MPW) run for silicon photonics. Coupling efficiency of ?4.9 dB and ?6.1 dB was experimentally demonstrated for LP01 mode and LP11 mode, respectively. The proposed mode multiplexer is entirely passive and suitable for future applications with FMFs in space-division-multiplexing (SDM) networks.
关键词： few-mode fibers,space-division multiplexing,diffraction gratings,Integrated optics
更新于2025-09-12 10:27:22
-
MDL reduction effect of S-bend induced modal coupling in five-mode ring core fiber
摘要： We discuss the extensibility of the S bend model to five mode ring core fiber (RCF). We propose a MUX/DEMUX for the five mode RCF and clarify design conditions from the viewpoint of connectivity. We evaluate the in-bobbin state with different barrel sizes and confirm the extensibility of the S bend model to five mode transmission. Furthermore, a transmission experiment demonstrates the reduction in MDL possible by promoting binding in five-mode RCF.
关键词： Ring-core fiber,Few-mode fibers,Difference of the effective index
更新于2025-09-04 15:30:14