Code-division multiple-access encoding and decoding of femtosecond optical pulses over a 2.5-km fiber link

Chang, C.-C.; Sardesai, H.P.; Weiner, Andrew M.

doi:10.1109/68.651153

Cited by 48 publications

(17 citation statements)

References 12 publications

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“…For long distance communication, wavelength division multiplexing (WDM) and time-division multiplexing (TDM) have been extensively explored and have shown impressive performance results [1]- [6]. For local area network (LAN) applications, optical code-division multiple-access (CDMA) communications systems [7]- [20] are also being investigated, in addition to the more traditional WDM and TDM schemes. Each data bit in an optical CDMA system is coded with a code that is unique to a particular user, and multiple users are accommodated by assigning different minimally interfering codes to different user pairs.…”

Section: Introductionmentioning

confidence: 99%

“…Several different optical CDMA schemes have been proposed [7]- [20], based on different choices of sources, coding schemes and detection. Two reviews of optical CDMA are given in [14] and [15].…”

Section: Introductionmentioning

confidence: 99%

“…Some of our preliminary results were described earlier [20]. In the course of constructing an ultrashort pulse CDMA "test bed," we have developed several ultrashort pulse CDMA component and subsystem technologies that may also have broader application to ultrafast optical communications and have begun to assess component technology limitations that may impact overall system performance.…”

Section: Introductionmentioning

confidence: 99%

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A femtosecond code-division multiple-access communication system test bed

Sardesai

Chang

Weiner

1998

J. Lightwave Technol.

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160

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Abstract-This paper reports comprehensive experimental results on a femtosecond code-division multiple-access (CDMA) communication system test bed operating over optical fiber in the 1.5 m communication band. Our test bed integrates together several novel subsystems, including low-loss fiber-pigtailed pulse shapers for encoding-decoding, use of dispersion equalizing fibers in dispersion compensated links for femtosecond pulse transmission and also in femtosecond chirped pulse amplification (CPA) erbium doped fiber amplifiers (EDFA's), and high-contrast nonlinear fiber-optic thresholders. The individual subsystems are described, and single-user system level experimental results demonstrating the ability to transmit spectrally encoded femtosecond pulses over a 2.5-km dispersion compensated fiber link followed by decoding and high contrast nonlinear thresholding are presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A femtosecond code-division multiple-access communication system test bed

Sardesai

Chang

Weiner

1998

J. Lightwave Technol.

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160

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“…Such SSFBGs should find application within a variety of optical-pulse processing systems [7], [8], including use within both DS-OCDMA code generation and recognition devices, and for which precise control of the amplitude and phase of the temporal pulse profile is essential. SSFBG technology represents an attractive means to produce compact and potentially low-cost components for such applications relative to the more conventional technological approaches, such as planar lightwave circuits [9], arrays of discrete fiber gratings [10], bulk grating-based systems incorporating spatial light modulators [11], and arrays of fiber couplers [12]. Fig.…”

mentioning

confidence: 99%

A grating-based OCDMA coding-decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction

Lee

Teh

Petropoulos

et al. 2002

J. Lightwave Technol.

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Abstract-We demonstrate an elementary grating-based optical code division multiple access (OCDMA) code generation and recognition system incorporating a nonlinear optical loop mirror (NOLM) within the receiver. We show that the NOLM can act as a nonlinear processing element capable of reducing both the pedestal associated with conventional matched filtering and the width of the associated code-recognition pulse. The pedestal rejection allows for an improved code recognition signal-to-noise ratio (SNR) relative to simple matched filtering alone, and reduced intra-and interchannel interference noise due to code overlap. The system benefits of using the NOLM are experimentally demonstrated under both single-and multiuser operation within a variety of seven-and 63-chip 160-Gchip/s code generation, recognition, and transmission experiments based on the use of bipolar superstructure fiber Bragg grating (SSFBG) coding-decoding pairs. Incorporation of the NOLM is shown to allow error-free penalty-free operation at data rates as high as 2.5 Gb/s under single-user operation, and to provide error-free performance with reduced power penalty in two-user experiments. The narrowed pulse recognition signature offers major advantages in terms of the further all-optical processing of decoded signals, such as code regeneration and recoding.Index Terms-Gratings, optical code division multiple access (OCDMA), optical fiber communication, optical fiber devices, optical signal processing, optical switches.

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“…In comparison with broadened incoherent sources such as those based on amplified spontaneous emission or supercontinuum generation, mode-locked sources do not suffer from beat noise between different portions of the spectrum within a channel, which can limit transmission capacity [5]- [7]. The coherence of the mode-locked source can be used to increase the channel information capacity by techniques such as those used in codedivision multiple-access (CDMA) networks [8]. Even higher bitrates per channel can be achieved by time multiplexing the short transform limited (picosecond) pulses generated in each of the spectrally sliced channels.…”

mentioning

confidence: 99%

Broad-band high-repetition-rate source for spectrally sliced WDM

Mikulla

Leng

Sears

et al. 1999

IEEE Photon. Technol. Lett.

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Abstract-A uniform 35-nm-wide spectrum is generated by broadening the output from a 2.5-GHz mode-locked femtosecond fiber laser in dispersion shifted fiber. The obtained spectrum is suitable for spectral slicing and wavelength-division-multiplexed applications. The spectral broadening in dispersion shifted fiber is optimized as a function of the launched pulse chirp parameter.Index Terms-High-repetition-rate mode-locked laser, modelocked fiber laser, optical fiber dispersion, optical fiber nonlinearity, pulse propagation in optical fiber, spectral slicing wavelengthdivision multiplexing, wavelength-division multiplexing. BROAD-BAND transmitters with multigigahertz data rates operating in the 1550-nm fiber-optic communications band are key enabling technologies for future wavelength and time division multiplexed (wavelength-division multiplexing and time-division multiplexing) networks. As the number of wavelength channels and data rates grow, using a separate stabilized source for each channel may become less practical. The individual CW sources must be tuned and aligned with the specific wavelength grid of the system. The use of a single, high repetition rate mode-locked erbium-doped fiber (EDF) laser simplifies wavelength stabilization and provides a potentially attractive alternative since its broad output spectrum can be partitioned into a large number of WDM channels [1], [2]. The wavelength channels are selected by passive filtering which facilitates the addition of new channels, and minimizes the affect of wavelength drift on system performance [3], [4]. In comparison with broadened incoherent sources such as those based on amplified spontaneous emission or supercontinuum generation, mode-locked sources do not suffer from beat noise between different portions of the spectrum within a channel, which can limit transmission capacity [5]- [7]. The coherence of the mode-locked source can be used to increase the channel information capacity by techniques such as those used in codedivision multiple-access (CDMA) networks [8]. Even higher bitrates per channel can be achieved by time multiplexing the short transform limited (picosecond) pulses generated in each of the spectrally sliced channels.In this letter, we report the generation of a uniform and flat, 35-nm-wide spectrum centered at 1549 nm from a 2.5-GHz repetition rate, femtosecond fiber laser. For channel

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Code-division multiple-access encoding and decoding of femtosecond optical pulses over a 2.5-km fiber link

Cited by 48 publications

References 12 publications

A femtosecond code-division multiple-access communication system test bed

A femtosecond code-division multiple-access communication system test bed

A grating-based OCDMA coding-decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction

Broad-band high-repetition-rate source for spectrally sliced WDM

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