Investigation of cascadability of add-drop multiplexers in OTDM systems

Jepsen, K.S.; Poulsen, H.N.; Clausen, A.T.; Buxens, A.; Stubkjaer, K.E.

doi:10.1109/ecoc.1998.732751

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…In this letter, we investigate the effects of a poor pulse ER on a 40-Gb/s OTDM system, and present a new way of increasing the pulse ER, and consequently the system performance using self-phase modulation (SPM) in a semiconductor optical amplifier (SOA), which is compact and integrable. We report penalty-free 40-Gb/s data reception after pulse ER improvement of the original 10-GHz signal from 15-20 dB to approximately 40 dB, which is required for time interleaving four OTDM channels with negligible penalty due to interference [4]. The experiment is supported by numerical simulations.…”

Section: Introductionsupporting

confidence: 51%

Pulse extinction ratio improvement using SPM in an SOA for OTDM systems applications

Nielsen

Olsson

Blumenthal

2002

IEEE Photon. Technol. Lett.

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Abstract-Improvement of pulse extinction ratio from 15-20 dB to approximately 40 dB of a 10-GHz pulse train is demonstrated using the self-phase modulation-induced spectral shift caused by a semiconductor optical amplifier (SOA). The improvement permits penalty-free optical time-division multiplexing to 40 Gb/s, and demultiplexing back to 10 Gb/s of an intentionally distorted signal. Without using the SOA the 40-Gb/s signal is not receivable.

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Section: Introductionsupporting

confidence: 51%

Pulse extinction ratio improvement using SPM in an SOA for OTDM systems applications

Nielsen

Olsson

Blumenthal

2002

IEEE Photon. Technol. Lett.

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“…A low extinction ratio between intensity of the peak of a data pulse and intensity in the wings causes channel crosstalk and interferometric noise due to the fluctuating phase difference of neighboring pulses [8]. For example, a 40-dB extinction ratio is required to interleave four 10 Gbit/s OTDM channels with negligible penalty due to interference [9]. This extinction ratio is easily achieved with Erbium-doped fiber lasers (> 40 dB), but difficult to achieve with electro-absorption modulators and LiNbO 3 modulators (15-25 dB) [10].…”

Section: Requirements For Otdm Sourcesmentioning

confidence: 99%

Semiconductor mode-locked lasers as pulse sources for high bit rate data transmission

2005

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Semiconductor mode-locked lasers are evaluated as pulse sources for high bit rate data transmission. This chapter describes the requirements of OTDM sources for high bit rate data transmission, compares various OTDM source technologies, describes three semiconductor mode-locked laser cavity designs, explains the impact of timing jitter and amplitude noise on OTDM performance, illustrates how to characterize noise of OTDM sources using rf and optical techniques, shows how to interpret the noise measurements, and finally discusses semiconductor mode-locked laser cavity optimizations that can achieve low noise performance.A critical part of the design of a communication system is the choice of the transmitter or source laser. High bit rate optical time-division multiplexed (OTDM) systems in particular demand reliable short pulse generation at high repetition rates and turn-key operation. Semiconductor mode-locked lasers are becoming increasingly attractive and viable for such applications.Semiconductor mode-locked lasers can be compact sources of picosecond, highrepetition rate pulses of light at the popular telecommunication wavelength of 1.5 μm [1,2]. Recent advances in semiconductor processing and cavity design have led to the advent of ultra-stable [3] and ultralow-noise [4,5] performance. With proper temperature control of the semiconductor device and a clean electric supply for the bias and injection current, the diode can remain mode-locked for days. Single-channel, singlepolarization transmission rates up to 160 Gb/s [6] have been successfully demonstrated using mode-locked semiconductor lasers, and detailed characterization of their noise

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“…This can be a severe limitation to cascaded add-drop multiplexing. Jepsen et al [12] reports a study of the requirements for cascading TADMs in terms of the dropped-channel timeslot suppression and pulsepeak-to-pedestal ratio for the added channel. It shows that in a realistic cascaded add-drop operation at 40 Gb/s, where it is not always the same channel that is dropped, an extremely high pulse-peak-to-pedestal ratio, i.e., in excess of 40 dB, is necessary to guarantee error-free performance within a 1-dB power penalty for slot suppression values under 25 dB.…”

Section: Introductionmentioning

confidence: 99%

OTDM add-drop multiplexer based on time-frequency signal processing

Almeida

Petropoulos

Parmigiani

et al. 2006

J. Lightwave Technol.

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A time-division add-drop multiplexer capable of high-extinction-ratio operation is presented both theoretically and experimentally. The approach used is based on time-to-frequency domain conversion of optical signals and relies upon the switching of linearly chirped optical pulses. By converting a 40-Gb/s optical time-division multiplexing (OTDM) signal to 4 × 10-Gb/s wavelength-division multiplexing (WDM) channels and using fiber Bragg gratings for frequency-domain add-drop multiplexing, a timeslot suppression ratio in excess of 30 dB and error-free operation for the dropped, through, and added channels were achieved. A further stage of WDM-to-TDM signal conversion was used to map the resulting signal back into the time domain. Moreover, it is shown that it is straightforward to simultaneously operate on multiple channels by simply cascading gratings to make more complex filtering functions without the requirement for any further synchronization of the tributary channels.

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Investigation of cascadability of add-drop multiplexers in OTDM systems

Abstract: The influence of coherent cross-talk on the cascadability of add-drop multiplexers in OTDM systems is analysed theoretically using moment generating3inctions. Calculations are validated by experiments.

Cited by 14 publications

References 2 publications

Pulse extinction ratio improvement using SPM in an SOA for OTDM systems applications

Pulse extinction ratio improvement using SPM in an SOA for OTDM systems applications

Semiconductor mode-locked lasers as pulse sources for high bit rate data transmission

OTDM add-drop multiplexer based on time-frequency signal processing

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