Evaluation of 4-Gbit/s optical fiber transmission distance with direct and external modulation

Okiyama, T.; Nishimoto, Hiroshi; Yokota, I.; Touge, T.

doi:10.1109/50.9985

Cited by 24 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While not illustrated, the same statement applies for Gd = 4 cm-I. The improvement arising from an increase in the bias current has been observed experimentally [4], [6], [8], [9].…”

Section: Resultssupporting

confidence: 59%

See 1 more Smart Citation

Threshold gain difference requirements for nearly single-longitudinal-mode lasers

Cartledge¹,

Elrefaie²

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond

View full text Add to dashboard Cite

The bit error ratio for lightwave systems affected by mode partition fluctuations is related to laser parameters, laser bias current, transmission bit rate, and encoding format (NRZ, RZ). A simulation-based solution of stochastic rate equations goveming the laser dynamics is used to determine a probabilistic description of mode partitioning. This description is applicable to formula-based methods of evaluating the bit error ratio. Utilizing a truncated pulse wain, Gauss quadrature rule method, many features unique to the problem of assessing the performance implications of mode partitioning are accommodated. Extensive numerical results quantify, for several systems, the required threshold gain difference between the lasing mode and the dominant side mode. For example, for 2.4Gbit/s NRZ modulation, the threshold gain difference requitement increases from 3 cm-' to 7 cm-' as the bias current of the laser decreases from 1.1 to 0.9 times the threshold current.

show abstract

“…While not illustrated, the same statement applies for Gd = 4 cm-I. The improvement arising from an increase in the bias current has been observed experimentally [4], [6], [8], [9].…”

Section: Resultssupporting

confidence: 59%

“…Because the side mode is most significant during the initial portion of a pulse, its time duration is less than a bit period. Consequently the system performance is sensitive to the decision time which could be ofket from io = 0 to avoid a bit error ratio floor [9]. This has important implications for the interpretation of experimental result.…”

Section: Resultsmentioning

confidence: 99%

Threshold gain difference requirements for nearly single-longitudinal-mode lasers

Cartledge¹,

Elrefaie²

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond

View full text Add to dashboard Cite

show abstract

“…A precise measurement of the etalon's FSR is necessary for matching its transmission channel with the International Telecommunication Union grid. Similarly, it is necessary to calibrate a high-speed amplitude modulator before use in long-haul optical fiber transmission systems [12][13][14] , or as a wideband optical signal source for a) katanyab@gmail.com characterizing the frequency response of photo-detectors or optical fibers 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Ultra-wide frequency response measurement of an optical system with a DC photo-detector

Kuntz¹,

Wheatley²,

Song³

et al. 2017

Opt. Express

View full text Add to dashboard Cite

Precise knowledge of an optical device's frequency response is crucial for it to be useful in most applications. Traditional methods for determining the frequency response of an optical system (e.g. optical cavity or waveguide modulator) usually rely on calibrated broadband photo-detectors or complicated RF mixdown operations. As the bandwidths of these devices continue to increase, there is a growing need for a characterization method that does not have bandwidth limitations, or require a previously calibrated device. We demonstrate a new calibration technique on an optical system (consisting of an optical cavity and a high-speed waveguide modulator) that is free from limitations imposed by detector bandwidth, and does not require a calibrated photo-detector or modulator. We use a low-frequency (DC) photo-detector to monitor the cavity's optical response as a function of modulation frequency, which is also used to determine the modulator's frequency response. Knowledge of the frequency-dependent modulation depth allows us to more precisely determine the cavity's characteristics (free spectral range and linewidth). The precision and repeatability of our technique is demonstrated by measuring the different resonant frequencies of orthogonal polarization cavity modes caused by the presence of a non-linear crystal. Once the modulator has been characterized using this simple method, the frequency response of any passive optical element can be determined to a fine resolution (e.g. kilohertz) over several gigahertz.

show abstract

“…The appearance of chirp in directly modulated link normally is considered as the limiting factor for high speed transmission where at higher bit rates, it leads to a broadening linewidth and thus limiting the transmission distance. However the simplicity of direct modulation technique is an advantage that can be manipulated in transmission of high speed capacity at shorter range [7].…”

Section: Introductionmentioning

confidence: 99%

Frequency Chirp Characteristics on WDM Direct Modulation

Mutalip

2010

2010 Second International Conference on Computer Engineering and Applications

View full text Add to dashboard Cite

The paper studies the characteristic of frequency chirp in optical communication network as well as the association of the chirp and BER intended for utilization of directly modulated wavelength division multiplexing (WDM). The research was made based on a simulation of a direct modulated link for different bit rates and fiber lengths to evaluate the effect of those parameters on frequency chirp. The result shows that the performance of the WDM direct modulation link is affected by the transmission bit rates and the distance.

show abstract

Evaluation of 4-Gbit/s optical fiber transmission distance with direct and external modulation

Cited by 24 publications

References 3 publications

Threshold gain difference requirements for nearly single-longitudinal-mode lasers

Threshold gain difference requirements for nearly single-longitudinal-mode lasers

Ultra-wide frequency response measurement of an optical system with a DC photo-detector

Frequency Chirp Characteristics on WDM Direct Modulation

Contact Info

Product

Resources

About