Transmission beyond the dispersion limit using a negative chirp electroabsorption modulator

Fells, Julian A. J.; Gibbon, M.A.; White, IH; Thompson, G.H.B.; Penty, RV; Armistead, C.J.; Kimber, E.M.; Moule, D.J.; Thrush, E. J.

doi:10.1049/el:19940778

Cited by 45 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result indicates that a wide QW is instrumental in getting negative ␦n͓⌬n͔. Our indication is different from other reported works 5,6,14 in that they employ narrower well widths less than 10 nm. It should be noted that there is a trade-off between increasing the red Stark shift and losing ␦␣͓⌬␣͔ due to decrease in oscillator strength.…”

Section: ͑1͒contrasting

confidence: 84%

“…4 An alternative to direct modulation is the use of semiconductor external electroabsorption ͑EA͒ modulators, whose chirp parameter values are lower, for use in transmission systems operating at 10 Gb/s and beyond. [5][6][7][8] The chirp parameter in the modulators actually depends on both bias voltage and modulation depth. Ideally it should be bias independent within the optimum range of chirp parameter mentioned above.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Potential chirp-free characteristics (negative chirp parameter) in electroabsorption modulation using a wide tensile-strained quantum well structure

Yamanaka

Wakita

Yokoyama

1996

Applied Physics Letters

View full text Add to dashboard Cite

Articles you may be interested inStrained InGaAsP/InGaAsP/InAsP multiquantum well structure for polarization insensitive electroabsorption modulator with high power saturation Polarizationinsensitive fieldinduced refractive index change using a latticematched InGaAlAs/InAlAs multiple quantum well structure Noncontact thickness and composition assessment of a strained AlGaAs/AlAs/InGaAs double barrier multiple quantum well structure

show abstract

Section: ͑1͒contrasting

confidence: 84%

mentioning

confidence: 99%

Potential chirp-free characteristics (negative chirp parameter) in electroabsorption modulation using a wide tensile-strained quantum well structure

Yamanaka

Wakita

Yokoyama

1996

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…7 This may indicate different dephasing mechanisms and hence dephasing times for s-like and p-like orbitals in deeply confined quantum dots. 10 A negative differential gain opens the possibility for negatively chirped directly modulated lasers, 16 may cast light upon mechanisms for high speed wavelength switching in dual state lasers, 14 allows new regimes for the operation of gain-lever lasers, 17,18 and suggests new properties for quantum dot optical amplifiers. 19 In summary, we have reported the study of the gain spectra of quantum dot laser materials at high carrier densities.…”

mentioning

confidence: 99%

Negative differential gain due to many body effects in self-assembled quantum dot lasers

Shahid

Childs

Stevens

et al. 2011

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…For example, at 10 Gb/s, the transmission distance that can be achieved with DMLs is typically limited to <10 km without any dispersion compensation [3], [4], [7], [8]. Several schemes have been proposed to mitigate the chirp problem, such as the use of chirp-controlled sources [9], negative-dispersion fibers [6], and dispersion compensation modules [10]. They, however, either require costly optical devices or installation of new type of optical fibers.…”

Section: Introductionmentioning

confidence: 98%

Directly modulated laser transmitter driven by DC-balanced line-coded signals

Kim

2010

2010 IEEE International Conference on Communication Systems

View full text Add to dashboard Cite

Directly modulated laser (DML) based optical transmitters provide cost-effectiveness, small footprint, high output power, and high reliability. However, the signal quality of the DML output is poorer than that of external modulator-based counterpart, mainly because of the frequency chirp accompanied by current modulation of DMLs. Especially, the large current modulation to achieve high extinction ratio of the output signals induces severe chirp and waveform distortion that the transmission distance is significantly limited in high data-rate systems. This can be overcome with frequency modulation of DMLs. By making good use of the frequency modulation of DMLs, not only can we reduce the driving voltage but we also substantially reduce the deleterious effects of chirped modulation. However, frequency modulation (FM)-based DML transmitters suffer from the non-uniform FM response of the laser at around 100 kHz to 10 MHz. It gives rise to severe pattern-dependent performance degradation to directly modulated baseband signals. In this paper, we investigate through experiment the use of line coding to deplete the low-frequency spectral contents of the signals and thus to alleviate the degradation. We measure the performance improvement of various line codes, including 8B/10B, 5B/6B, 7B/8B, 9B/10B, and 64B/66B, for continuousphase frequency-shift keying (CPFSK)/amplitude-shift keying (ASK) signals generated by a DML and a delay interferometer. Experimental demonstrations are performed with a long pseudorandom bit sequence length of 2 20 -1 and the bandwidth expansion by the line coding is taken into consideration. We also propose and demonstrate DML-based transmitters driven by highly band-limited electrical signals to alleviate the modulation bandwidth limitation. By using duobinary coding together with DC-balanced line coding, we generate 10-Gbps signals using a DML driven by 3.5-GHz-bandwdith signals and transmit them over 20-km of standard single-mode fiber without any dispersion compensation.

show abstract

Transmission beyond the dispersion limit using a negative chirp electroabsorption modulator

Cited by 45 publications

References 3 publications

Potential chirp-free characteristics (negative chirp parameter) in electroabsorption modulation using a wide tensile-strained quantum well structure

Potential chirp-free characteristics (negative chirp parameter) in electroabsorption modulation using a wide tensile-strained quantum well structure

Negative differential gain due to many body effects in self-assembled quantum dot lasers

Directly modulated laser transmitter driven by DC-balanced line-coded signals

Contact Info

Product

Resources

About