Demonstration of Flat-Passband Multi/Demultiplexer Using Multi-Input Arrayed Waveguide Grating Combined With Cascaded Mach–Zehnder Interferometers

Maru, Koichi; Mizumoto, Tetsuya; Uetsuka, Hiroshi

doi:10.1109/jlt.2007.901339

Cited by 34 publications

(19 citation statements)

References 29 publications

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“…with 100 GHz adjacent channel spacing, this is about the same with those seen in [30,31] and will easily accommodate the slot rate of GHz 7 . 45 for maximum DPPM coding level of 7  M considered [2].…”

Section: Single Crosstalk Resultsmentioning

confidence: 89%

“…45 for maximum DPPM coding level of 7  M considered [2]. Typical values for adjacent channel rejection ratio ranges from -20 dB to -30 dB [30][31][32], however in this work, the level of crosstalk (relative to signal at the photodiode) which could be worsened by asymmetric demux input powers is allowed to vary from negligible case of -30 dB to a very worse case of -5 dB and the resulting crosstalk effect is calculated and shown for each case. A target BER of 9 10  is considered for systems without forward error correction coding (FEC) [33,34], and 3 10  is considered for systems with FEC.…”

Section: Single Crosstalk Resultsmentioning

confidence: 99%

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Performance evaluation of digital pulse position modulation for wavelength division multiplexing FSO systems impaired by interchannel crosstalk

Mbah

Walker

Phillips

2014

IET Optoelectronics

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Wavelength division multiplexing (WDM) has been proposed for fibre, intersatellite, free space and indoor optical communication systems. Digital pulse position modulation (DPPM) is a more power efficient modulation format than on-off keying (OOK) and a strong contender for the modulation of free space systems. While DPPM obtains this advantage in exchange for a bandwidth expansion WDM systems using it are still potentially attractive, particularly for moderate coding levels. However WDM systems are susceptible to interchannel crosstalk and modelling this in a WDM DPPM system is necessary. Models of varying complexity, based on simplifying assumptions, are presented and evaluated for the case of a single crosstalk wavelength. For a single crosstalk, results can be straightforwardly obtained by artificially imposing the computationally convenient constraint that frames (and thus slots also) align (FA). Multiple crosstalk effects are additionally investigated, for the most practically relevant 2 cases of modest coding level, and using both simulation and analytical methods. In general, DPPM maintains its sensitivity advantage over OOK even in the presence of crosstalk while predicting lower power penalty at low coding level in WDM systems.

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Section: Single Crosstalk Resultsmentioning

confidence: 89%

Section: Single Crosstalk Resultsmentioning

confidence: 99%

Performance evaluation of digital pulse position modulation for wavelength division multiplexing FSO systems impaired by interchannel crosstalk

Mbah

Walker

Phillips

2014

IET Optoelectronics

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“…The mux/demux channel bandwidth is assumed to be 76 GHz, with insertion loss of about 3.5 dB and adjacent channel spacing of 100 GHz in the C-band of the ITU (International Telecommunication Union) grid specification. Demux adjacent channel rejection values typically ≤ -15 dB and ≥ -45 dB have been demonstrated experimentally in [36][37][38] and are considered. As seen in [25], the impact of a single high power crosstalk is worse than that of many crosstalk of equivalent power.…”

Section: Resultsmentioning

confidence: 99%

Performance evaluation of turbulence‐accentuated interchannel crosstalk for hybrid fibre and free‐space optical wavelength‐division‐multiplexing systems using digital pulse‐position modulation

Mbah

Walker

Phillips

2016

IET Optoelectronics

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A hybrid fibre and free space optical (FSO) communication link using digital pulse position modulation (DPPM) in a wavelength division multiplexing (WDM) system is proposed. Such a system, which could provide a power efficient, robust and flexible solution to high speed access networks, is a contender for a passive optical network (PON) solution and could readily be deployed in areas with restrictions in optical fibre installation, or alternatively as a disaster recovery network. However, the effects of interchannel crosstalk, which is common in WDM systems, and atmospheric turbulence-induced scintillation, limit the performance of such system. Both impairments, which could combine in some cases to further degrade the system performance, are investigated here. Specifically, the symbol error probability, the required optical transmission power and power penalties are derived. Furthermore, the required performance of the demultiplexers in terms of adjacent channel rejection is studied with respect to the FSO link length. A simple relationship between the turbulence attenuation and crosstalk 2 is derived to facilitate demultiplexer selection in the design and analysis of practical systems without forward error correction (FEC) coding. Results also show that DPPM systems are more power efficient than OOK systems in the presence of crosstalk accentuated by atmospheric turbulence.

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“…Of these, the most effective method involves using an additional MZI-based interferometer that controls the position at which light enters the AWG according to the signal wavelength. Configurations employing a single MachZehnder interferometer (MZI) [1], a three delay arm interferometer [2] and three MZIs [3] as an additional interferometer have already been proposed and demonstrated. We have also developed a tandem MZI-synchronized AWG that has a wide passband [4].…”

Section: Introductionmentioning

confidence: 99%

Wide passband tandem MZI-synchronized AWG employing mode converter and multimode waveguide

Oguma

Kamei

Kitoh

et al. 2010

IEICE Electron. Express

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Demonstration of Flat-Passband Multi/Demultiplexer Using Multi-Input Arrayed Waveguide Grating Combined With Cascaded Mach–Zehnder Interferometers

Cited by 34 publications

References 29 publications

Performance evaluation of digital pulse position modulation for wavelength division multiplexing FSO systems impaired by interchannel crosstalk

Performance evaluation of digital pulse position modulation for wavelength division multiplexing FSO systems impaired by interchannel crosstalk

Performance evaluation of turbulence‐accentuated interchannel crosstalk for hybrid fibre and free‐space optical wavelength‐division‐multiplexing systems using digital pulse‐position modulation

Wide passband tandem MZI-synchronized AWG employing mode converter and multimode waveguide

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