Optical DPSK/Heterodyne-. Detection scheme using two polarization planes

1995 ◽  
Vol 78 (8) ◽  
pp. 32-45
Author(s):  
Katsutoshi Tsukamoto ◽  
Shigeru Kuwano ◽  
Norihiko Morinaga
Keyword(s):  
Heterodyne Detection ◽  
Detection Scheme

Simple-structure integrated coherent transceiver with novel counter-receiving heterodyne detection scheme

1999 ◽  
Vol 35 (5) ◽  
pp. 385
Author(s):  
L.M. Wang ◽  
J.H. Chen ◽  
M.H. Shih ◽  
F.S. Choa ◽  
T. Tanbun-Ek ◽  
...  
Keyword(s):  
Simple Structure ◽  
Heterodyne Detection ◽  
Detection Scheme

Heterodyne detection scheme for light-induced transient grating experiment

2008 ◽  
Vol 281 (24) ◽  
pp. 6061-6064 ◽  
Author(s):  
T. Malinauskas ◽  
S. Nargelas ◽  
R. Aleksiejunas ◽  
K. Jarasiunas
Keyword(s):  
Heterodyne Detection ◽  
Transient Grating ◽  
Detection Scheme

scholarly journals Stokes dual-soliton spectroscopy in a graphene functionalized over-modal microresonator

2021 ◽  
Author(s):  
Giancarlo Soavi ◽  
Zhongye Yuan ◽  
Teng Tan ◽  
Guofeng Yan ◽  
Siyu Zhou ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Chemical Species ◽  
Transverse Mode ◽  
Photonic Devices ◽  
Heterodyne Detection ◽  
Detection Scheme ◽  
Biochemical Sensing ◽  
Highly Sensitive ◽  
Spectral Ranges ◽  
First Time

Abstract Dual comb spectroscopy enables fast and accurate measurements over broad spectral ranges, offering a powerful tool to identify chemical species with unprecedented spectral resolution. Co-generation of soliton combs in one single microresonator can be used to improve the compactness of multi-comb sources and bridge the lab-to-fab gap. However, the robustness of pristine microresonators to environmental changes limits their potential in broader applications such as biochemical sensing. Here, we realize for the first time a two-dimensional-material functionalized dual-comb spectrometer by asymmetrically depositing graphene in an over-modal microsphere. Spectrally trapped Stokes solitons belonging to distinct transverse mode families are co-generated in one single device. A soliton mode in the graphene-functionalized region is highly sensitive to environmental changes while a second soliton mode in the pristine region serves as reference, thus producing dual-comb ultrasensitive beat notes in the electrical domain. Taking advantage of an advanced optoelectronic heterodyne detection scheme, we trace the frequency shift of the dual-soliton beat-note with uncertainty < 0.2 Hz and we achieve real-time individual gas molecule detection in vacuum. This combination of atomically thin materials and microcombs shows the potential for integrated spectroscopy with unprecedented performances and offers new insights toward the design of versatile functionalized microcavity photonic devices.

Phase-sensitive optical time-domain reflectometric system based on a single-source dual heterodyne detection scheme

2017 ◽  
Vol 56 (14) ◽  
pp. 4058 ◽  
Author(s):  
Miao Yu ◽  
Minhan Liu ◽  
Tianying Chang ◽  
Jinpeng Lang ◽  
Jiandong Chen ◽  
...  
Keyword(s):  
Time Domain ◽  
Heterodyne Detection ◽  
Single Source ◽  
Detection Scheme ◽  
Phase Sensitive ◽  
Optical Time

APPROACH TO DETERMINING THE VALUE OF THE DYNAMIC RANGE OF AN OPTICAL RECEIVER THAT IMPLEMENTS DIRECT AND HETERODYNE DETECTION METHODS

2020 ◽  
pp. 86-91
Author(s):  
А.Ю. Козирацкий ◽  
А.И. Гревцев ◽  
Р.И. Буров
Keyword(s):  
Dynamic Range ◽  
Direct Detection ◽  
Decisive Role ◽  
Comparative Assessment ◽  
Optical Receiver ◽  
Heterodyne Detection ◽  
Detection Methods ◽  
Detection Scheme ◽  
Value Analysis ◽  
Detection Schemes

Рассматриваются вопросы, связанные с определением возможностей использования фотодетекторов в различных схемах детектирования при приеме сигналов с изменяющейся амплитудой. Определены особенности влияния реализуемых на практике схем детектирования на величину динамического диапазона фотодетектора и потенциально достижимую чувствительность. Разработан подход, позволяющий провести сравнительную оценку изменения величины динамического диапазона в зависимости от реализуемой схемы оптического приемника. Показано, что в отличие от схемы прямого детектирования, где величина динамического диапазона напрямую определяется свойствами самого фотодетектора, при гетеродинном детектировании основную роль в определении указанной величины играет уровень опорного колебания. Анализ полученных результатов показывает, что адаптивное управление величиной опорного колебания при переходе к схеме гетеродинного детектирования с сохранением типа фотодетектора позволяет не только существенно расширить диапазон изменения амплитуды принимаемых сигналов и максимизировать величину динамического диапазона, но и реализовать потенциально достижимую чувствительность, величина которой определяется шумовыми свойствами самого фотодетектора. Конкретизация типа рассматриваемых фотодетекторов позволила ограничиться рассмотрением только теплового и дробового шумов. Определение величины динамического диапазона для других типов фотодетекторов в рамках данного подхода возможно с учетом присущих им шумовых свойств Here we consider issues related to determining the possibilities of using photodetectors in various detection schemes when receiving signals with varying amplitudes. We determined the features of the influence of practical detection schemes on the value of the dynamic range of the photodetector and the potentially achievable sensitivity. We developed an approach that allows for a comparative assessment of changes in the dynamic range depending on the implemented optical receiver scheme. We show that in contrast to the direct detection scheme, where the value of the dynamic range is directly determined by the properties of the photodetector itself, in the case of heterodyne detection, the level of the reference oscillation plays a decisive role in determining this value. Analysis of the obtained results shows that adaptive control of the reference oscillation value when switching to the heterodyne detection scheme with the preservation of the photodetector type allows us not only to significantly expand the range of changes in the amplitude of the received signals and maximize the dynamic range but also to realize a potentially achievable sensitivity, the value of which is determined by the noise properties of the photodetector itself

Low-noise and high-sensitivity Φ-OTDR based on an optimized dual-pulse heterodyne detection scheme

2020 ◽  
Vol 59 (7) ◽  
pp. 1864 ◽  
Author(s):  
Zewu Ju ◽  
Zhijie Yu ◽  
Qingkai Hou ◽  
Kang Lou ◽  
Mo Chen ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Low Noise ◽  
Heterodyne Detection ◽  
Detection Scheme
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