An optical pulse width modulation generator based on the injection-locking property of single mode FP-LD

2013 ◽  
Author(s):  
Quoc Hoai Tran ◽  
Bikash Nakarmi ◽  
Yong Hyub Won
Keyword(s):  
Pulse Width ◽  
Optical Pulse ◽  
Pulse Width Modulation ◽  
Single Mode ◽  
Injection Locking

Rotational Speed Control by Optical PWM Operation for Single Cells

2006 ◽  
Vol 18 (6) ◽  
pp. 824-826
Author(s):  
Makoto Yoshida ◽  
◽  
Ichirou Ishimaru ◽  
Katsumi Ishizaki ◽  
Toshiki Yasokawa ◽  
...  
Keyword(s):  
Light Absorption ◽  
Rotational Speed ◽  
Pulse Width ◽  
Optical Pulse ◽  
Pulse Width Modulation ◽  
Single Cells ◽  
Light Pressure ◽  
Illumination Time ◽  
Proximal Points ◽  
Rotational Speed Control

To rotating single cells, we harness light pressure generated by light absorption as a rotating torque, illuminating the two proximal points from different directions using two beams. Rotational speed is controlled by optical pulse width modulation (PWM) that controls the amount of light received per unit of time by controlling the time of illumination. To change the illumination time, the pencil of rays is scanned by a galvanometric mirror.

scholarly journals Rotational Torque Control of Proximal Two-beam Optical Tweezers by Optical Pulse Width Modulation

2006 ◽  
Vol 72 (12) ◽  
pp. 1531-1536
Author(s):  
Hiroaki KOBAYASHI ◽  
Ichirou ISHIMARU ◽  
Katsumi ISHIZAKI ◽  
Makoto YOSHIDA ◽  
Toshiki YASOKAWA
Keyword(s):  
Optical Tweezers ◽  
Pulse Width ◽  
Optical Pulse ◽  
Pulse Width Modulation ◽  
Torque Control

scholarly journals Optical Multilevel Pulse Width Modulation for Analog Mobile Fronthaul

Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 49
Author(s):  
Lorenzo Combi ◽  
Alberto Gatto ◽  
Pierpaolo Boffi ◽  
Umberto Spagnolini ◽  
Paola Parolari
Keyword(s):  
Wavelength Division Multiplexing ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Radio Over Fiber ◽  
Passive Optical Network ◽  
Modulation Formats ◽  
Digital Radio

The evolution of radio access networks is towards a centralized architecture (C-RAN), with massive antenna deployments and large radio-frequency bandwidths. In the next future, traditional optical transport technologies based on digital radio over fiber will no longer be able to support the mobile fronthaul traffic connecting antennas hosted at remote radio units and centralized baseband units. Analog radio over fiber can be selected to support the mobile fronthaul (MFH) network and, in particular, pulse width modulation (PWM) is a viable alternative for analog signal transport. In order to increase the MFH spectral efficiency, we propose to exploit multilevel PWM (M-PWM) in a wavelength division multiplexing-passive optical network (WDM-PON) network, comparing its performance with a conventional 2-level PWM solution. Experimental results show successful transmission over 7.5-km standard single mode fiber (SSMF) of up to 16 aggregated LTE-like 20-MHz signals with 64-QAM on each subcarrier, while up to eight aggregated LTE-like 20-MHz signals with 256-QAM could be supported. M-PWM thus allows either using higher order modulation formats or aggregating a higher number of LTE channels.

The 1-Bit Instrument

2020 ◽  
Vol 1 (1) ◽  
pp. 44-74
Author(s):  
Blake Troise
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Interleaving Techniques ◽  
Sonic Environment

The 1-bit sonic environment (perhaps most famously musically employed on the ZX Spectrum) is defined by extreme limitation. Yet, belying these restrictions, there is a surprisingly expressive instrumental versatility. This article explores the theory behind the primary, idiosyncratically 1-bit techniques available to the composer-programmer, those that are essential when designing “instruments” in 1-bit environments. These techniques include pulse width modulation for timbral manipulation and means of generating virtual polyphony in software, such as the pin pulse and pulse interleaving techniques. These methodologies are considered in respect to their compositional implications and instrumental applications.

An Equivalent Circuit Model for Vertical Comb Drive MEMS Optical Scanner Controlled by Pulse Width Modulation

2012 ◽  
Vol 132 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Satoshi Maruyama ◽  
Muneki Nakada ◽  
Makoto Mita ◽  
Takuya Takahashi ◽  
Hiroyuki Fujita ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Comb Drive ◽  
Optical Scanner
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