Impact of a Post-OTDM-Demux Optical Filter

2015 ◽  
pp. 310-325
Keyword(s):  
Wavelength Division Multiplexing ◽  
Pulse Width ◽  
Optical Filter ◽  
Signal Pulse ◽  
Spectral Densities ◽  
Wavelength Division ◽  
Optical Time Division Multiplexing ◽  
Optical Time ◽  
Time Division ◽  
The Impact

The impact of a post-OTDM-demultiplexing optical filter on the performance of dense On-Off Keying (OOK) Optical Time Division Multiplexing (OTDM)-Wavelength Division Multiplexing (WDM) systems is studied in this chapter. For Return-to-Zero (RZ) modulation, it was found that the additional filter working in a double-tier filter configuration did not offer any significant improvements to performance when the signal pulse width is optimized. Improvements generally increase only when the signal pulse width deviates from its optimal value and only for low spectral densities. For ideal Non-Return-to-Zero (NRZ) modulation, however, significant improvements of around 1 dB are obtained using the double-tier configuration over a large range of spectral densities.

Compact low-noise pulse generating lasers with repetition rates of 10 to 50 GHz

2005 ◽  
Vol 15 (03) ◽  
pp. 497-512 ◽  
Author(s):  
G. J. Spühler ◽  
L. Krainer ◽  
S. C. Zeller ◽  
Ch. Erny ◽  
R. Paschotta ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Time Domain ◽  
Fundamental Mode ◽  
Low Noise ◽  
Noise Pulse ◽  
Wavelength Division ◽  
Optical Time Division Multiplexing ◽  
Optical Time ◽  
The Time Domain ◽  
Time Division

We review the main results obtained with our recently introduced passively fundamental mode-locked Er : Yb :glass lasers mainly in the context of telecom applications, and we discuss their key enablers. Specifically, we focus on the aspects of the lasers for application in the time-domain for optical time-division multiplexing and in the wavelength domain for dense wavelength-division-multiplexing.

Optimization of Parameters for Optimal Performance

2015 ◽  
pp. 272-284
Keyword(s):  
Spectral Density ◽  
Wavelength Division Multiplexing ◽  
Duty Cycle ◽  
Optical Filter ◽  
Spectral Width ◽  
Optical Signal ◽  
Signal Pulse ◽  
Filter Bandwidth ◽  
Wavelength Division ◽  
Optical Time

The impact of the signal pulse width and the optical filter bandwidth on the performance of both RZ and NRZ On-Off Keying (OOK) Optical Time Division Multiplexing (OTDM)-Wavelength Division Multiplexing (WDM) systems are studied in this chapter. Using polynomial fitting, an approximated expression for the optimal signal pulse duty cycle as a function of the spectral density SD and Optical Signal to Noise Ratio (OSNR) is provided. Further, it is found that the bit rate per WDM channel does not affect the optimum signal pulse duty cycle. As the spectral density SD increases, DCopt increases, reducing the signal spectral width to compensate for the reduced the WDM channel frequency spacing ?f. For increasing OSNR, DCopt increases slightly, especially at higher SD. The authors found that ideal NRZ performs better than optimized RZ at high SD but worse at low SD.

Optical time-division multiplexing and demultiplexing in a multigigabit/second fibre transmission system

1987 ◽  
Vol 23 (5) ◽  
pp. 208-209 ◽  
Author(s):  
R.S. Tucker ◽  
G. Eisenstein ◽  
S.K. Korotky ◽  
U. Koren ◽  
G. Raybon ◽  
...  
Keyword(s):  
Transmission System ◽  
Time Division Multiplexing ◽  
Fibre Transmission ◽  
Optical Time Division Multiplexing ◽  
Optical Time ◽  
Time Division

scholarly journals 160-Gb/s optical time division multiplexing and multicasting in parametric amplifiers

2008 ◽  
Vol 16 (21) ◽  
pp. 16609 ◽  
Author(s):  
Camille-Sophie Brès ◽  
Andreas O.J. Wiberg ◽  
James Coles ◽  
Stojan Radic
Keyword(s):  
Parametric Amplifiers ◽  
Time Division Multiplexing ◽  
Optical Time Division Multiplexing ◽  
Optical Time ◽  
Time Division

scholarly journals Thermo-Optic Tunable Optical Filter Based on Fabry-Perot Microcavities in SOI

2012 ◽  
Vol 6-7 ◽  
pp. 194-199
Author(s):  
Zhe Li ◽  
Hua Juan Qi ◽  
Yong Chuan Xiao ◽  
Feng Li Gao
Keyword(s):  
Refractive Index ◽  
Wavelength Division Multiplexing ◽  
Optical Filter ◽  
Silicon On Insulator ◽  
Central Wavelength ◽  
Wavelength Division ◽  
Tunable Optical Filter ◽  
Compact Size ◽  
Fabry Perot ◽  
Output Characteristics

An integrated TOF (Tunable Optical Filter) based on thermo-optic effect in Silicon on insulator (SOI) rib waveguide is designed and simulated. The device is comprised of two high refractivity contrast Si/Air stacks, functioning as high reflectivity of DBRs and separated by a variable refractive index Si F-P cavity. The output characteristics are calculated and simulated based on Transfer Matrix Method (TMM). Wavelength tuning is achieved through thermal modulation of refractive variation of the cavity.As the cavity Si is heated,the refractive index of the cavity increases.When the temperature of cavity Si changes within100°C，the central wavelength gets a continuous 8nm shift from 1550nm to 1558nm, which is right located in the WDM (Wavelength division multiplexing) networks operating at C-band. Moreover, by calculating, the tuning sensitivity is about 0.08nm/°C. Owing to the compact size and excellent characteristics of integration, the proposed component has a promising utilization in spectroscopy and optical communication.

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