Effects of filter concatenation for directly modulated transmission lasers at 2.5 and 10 Gb/s

Downie, John D.; Tomkos, Ioannis; Antoniades, N.; Boskovic, A.

doi:10.1109/50.983235

Cited by 42 publications

(27 citation statements)

References 9 publications

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“…This downstream passes through wavelength filters four times until retuning to the upstream receiver at CO over its loop-back path. Hence, passing through wavelength filters repeatedly leads to the ER change because of a selective spectral filtering [22]. Figure 11(b) represents the change of measured ER values after passing through four-concatenated AWG filters.…”

Section: A Frequency Detuningmentioning

confidence: 99%

“…Here, the laserto-filter detuned frequency is defined as the amount of frequency difference between the DFB-LD wavelength without modulation and the peak of the filter pass-band. Since each of spectral components corresponding to the "0"-level and the "1"-level is selectively filtered out by Gaussian-shaped filter pass-band of the AWG [22], the ER changes whenever passing through an AWG filter.…”

Section: A Frequency Detuningmentioning

confidence: 99%

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RSOA-Based Wavelength-Reuse Gigabit WDM-PON

Kim

2008

Journal of the Optical Society of Korea

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This article presents the RSOA-based re-modulation schemes for practical application to the WDM-PON link. Emphasis is put on the three methods for reducing the residual downstream signal in the upstream transmission; the simplest one is to use the RSOA gain-saturation property, the second uses selective filtering of the adiabatic-chirped DFB-LD output spectrum, and the last uses a dynamic RSOA gain control by varying its driving current according to the incident binary signal. The reflection sensitivity in the proposed re-modulation link is also qualitatively presented in the cases of using two different types of seed light: coherent light from DFB-LD array and spectrum-sliced incoherent ASE light. We show experimental results of an error-free bidirectional gigabit transmission over 20 km at -30 dB reflection with the spectrum-sliced ASE seed light.

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Section: A Frequency Detuningmentioning

confidence: 99%

Section: A Frequency Detuningmentioning

confidence: 99%

RSOA-Based Wavelength-Reuse Gigabit WDM-PON

Kim

2008

Journal of the Optical Society of Korea

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“…With the amount of cascaded filters increasing, it will increase the effect of spectral clipping and make the effective bandwidth narrower and narrower. This effect can lead to the signal distortion in the time domain, causing a Qfactor penalty or EOP [2,8,12].…”

Section: Characteristics Of Cascaded Optical Filtersmentioning

confidence: 99%

“…According to [2], many filters have characteristics that are well approximated by a 3rd order Butterworth filter transfer function, such as the thin film filters that are widely used in WDM systems. In this paper we will focus on the 3rd Butterworth filter and compared its performance with Bessel, FBG and F-P filters.…”

Section: Characteristics Of Cascaded Optical Filtersmentioning

confidence: 99%

“…In the transparent optical network, an optical signal may be passing through several optical cross-connects (OXCs) nodes, Dispersion Compensation Modules (DCMs) which are based on chirped fiber Bragg gratings, and reconfigurable optical add-drop multiplexers (ROADMs) before it reaches the destination [1,2]. Normally, the OXCs and ROADMs comprise of several filters, such as wavelength blockers (WB) and wavelength selective switches (WSS).…”

Section: Introductionmentioning

confidence: 99%

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Optical signal impairment study of cascaded optical filters in 40 Gbps DQPSK and 100 Gbps PM-DQPSK systems

Chen

Horche

Minguez

2013

Optics and Photonics for Information Processing VII

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Optical filters are crucial elements in optical communications. The influence of cascaded filters in the optical signal will affect the communications quality seriously. In this paper we will study and simulate the optical signal impairment caused by different kinds of filters which include Butterworth, Bessel, Fiber Bragg Grating (FBG) and Fabry-Perot (F-P). Optical signal impairment is analyzed from an Eye Opening Penalty (EOP) and optical spectrum point of view. The simulation results show that when the center frequency of all filters aligns with the laser's frequency, the Butterworth has the smallest influence to the signal while the F-P has the biggest. With a -1dB EOP, the amount of cascaded Butterworth optical filters with a bandwidth of 50 GHz is 18 in 40 Gbps NRZ-DQPSK systems and 12 in 100 Gbps PM-NRZ-DQPSK systems. The value is reduced to 9 and 6 respectively for Febry-Perot optical filters. In the situation of frequency misalignment, the impairment caused by filters is more serious. Our research shows that with a frequency deviation of 5 GHz, only 12 and 9 Butterworth optical filters can be cascaded in 40 Gbps NRZ-DQPSK and 100 Gbps PM-NRZ-DQPSK systems respectively. We also study the signal impairment caused by different orders of the Butterworth filter model. Our study shows that although the higher-order has a smaller clipping effect in the transmission spectrum, it will introduce a more serious phase ripple which seriously affects the signal. Simulation result shows that the 2nd order Butterworth filter has the best performance.Keywords: optical filter, optical communication, differential quadrature phase shift keying (DQPSK), polarization multiplexed differential quadrature phase shift keying (PM-DQPSK), signal impairment

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WDMMetropolitan‐Area Optical Networks

Tomkos

2003

Wiley Encyclopedia of Telecommunications

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In this article, the characteristics, requirements and architectures of optical metropolitan area networks are presented. The main features of system offerings proposed for metro networks are also discussed. We outline our considerations about the evolution of metro area networks from SONET rings, to transparent wavelength‐routed WDM rings. We also describe the major transport impairments that limit the performance of transparent WDM metropolitan area networks and we present the characteristics of metro‐optimized optical amplifiers, fibers and optical add/drop multiplexers. Finally, we discuss recent research results that demonstrate that a properly engineered system utilizing application‐optimized components and fiber will enable the buildup of cost‐effective metro‐optimized WDM all‐optical networks.

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Effects of filter concatenation for directly modulated transmission lasers at 2.5 and 10 Gb/s

Cited by 42 publications

References 9 publications

RSOA-Based Wavelength-Reuse Gigabit WDM-PON

RSOA-Based Wavelength-Reuse Gigabit WDM-PON

Optical signal impairment study of cascaded optical filters in 40 Gbps DQPSK and 100 Gbps PM-DQPSK systems

WDMMetropolitan‐Area Optical Networks

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