40-GHz tunable optical pulse generation from a highly stable external-cavity mode-locked semiconductor laser module

Hashimoto, Y.; Yamada, Hirohito; Kuribayashi, R.; Yokoyama, Hiroyuki

doi:10.1109/ofc.2002.1036405

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…Here we describe the direct generation of wavelength-tunable 10-GHz optical clock pulses by mode locking of an EC-MLLD module. The stability of MLLDs was drastically improved by using compact device-module packaging [12][13][14]. Photographs of a highly-stable EC-MLLD and of its application to a driver case are shown in Figure 1.…”

Section: Mode-locked Semiconductor Laser Diodementioning

confidence: 99%

“…We obtained a mode-locking frequency tunability of between 9.9 and 10.1 GHz and wavelength tunability within the bandwidth of a C-band Er-doped fiber amplifier (1530-1570 nm). This module can also generate 40-GHz repetition rate optical pulses due to higher-harmonic modelocking operation of the MLLD [8,14]. A higher-harmonic hybrid mode locking can be obtained by modulating the SA section at a higher harmonic frequency.…”

Section: Mode-locked Semiconductor Laser Diodementioning

confidence: 99%

“…For over 100-Gbit/s OTDM applications, these oscillators should generate optical pulses of less than 5 ps in temporal width, less than 0.5 ps in timing jitter, and be transform-limited. Therefore, mode-locked laser diodes (MLLDs) are very attractive because they can directly generate such coherent optical pulses [6][7][8][9][10][11][12][13][14], while other methods using laser diodes such as gain switching [15] and external intensity modulation [16] need additional optical pulse compression and spectrum filtering. The MLLD is also attractive as an all-optical clock extraction device, which is an essential element for alloptical DEMUXs and 3R repeaters.…”

Section: Introductionmentioning

confidence: 99%

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Optical signal processing using mode-locked semiconductor laser diode

et al. 2006

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We investigated ultrafast optical signal processing schemes utilizing mode-locked semiconductor laser diodes (MLLDs) for optical time-division multiplexing (OTDM) transmission at over 100 Gbit/s and developed a polarizationinsensitive all-optical clock recovery scheme for an optical-electrical hybrid phase-locked loop (PLL) operating at 160 Gbit/s. In this scheme, the MLLD functions as a voltage-controlled oscillator to which the error signal is fed back by forming a closed loop with a semiconductor optical amplifier (SOA) used as a phase comparator and with a lowfrequency component used as a filter. Cross-gain modulation in the SOA enables high-frequency PLL operation at 160 Gbit/s. A bulk active layer in the SOA with small polarization dependency is the origin of the polarization insensitive clock extraction. Testing of all-optical clock extraction on an OTDM transmission test bed of 254-km field-installed fibers (Dojima-Keihanna, 63.5 km, and four spans) at 160 Gbit/s showed that the measured root-mean-square timing jitter of the recovered clock signal was as low as 240 fs. This clock extraction scheme is thus practical for use in OTDM systems operating at over 100 Gbit/s.

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Section: Mode-locked Semiconductor Laser Diodementioning

confidence: 99%

Section: Mode-locked Semiconductor Laser Diodementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical signal processing using mode-locked semiconductor laser diode

et al. 2006

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“…Light is an attractive medium for computation; optical fibers have many times the data-carrying capacity of their electric counterparts; externally modulated light sources can be operated at high speeds [2]; an all-optical circuit could employ reversible logic, allowing for dissipationless computing [3]; a passive optical logic could compute "at the speed of light," avoiding fan-out delays associated with transistor logic [4]. In addition, all-optical logic in the form of network packet switching would be a very attractive alternative to current optical-electrical-optical (OEO) solutions [5].…”

Section: Introductionmentioning

confidence: 99%

Optical interference logic in silicon-on-insulator waveguides

Wheeler

Hall

2006

SPIE Proceedings

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A novel means of realizing optical logic with passive silicon-on-insulator (SOI) waveguide elements is proposed and modeled. Using what we call interference logic (IL), information is encoded and manipulated in the complex domain by properly setting the amplitude and phase of information inputs through specially designed waveguide structures, with the resulting wave interference used to compute the desired function output. We demonstrate that any arbitrary Boolean logic function can be realized in any physical system in which interference occurs. In this work, optical interference logic utilizing constructive and destructive interference of 1.55 micron light waves in multi-mode interference (MMI) couplers fabricated with SOI rib waveguides is described. Defining a vector representation of the complex information, a numerical function minimization algorithm is employed to compute the optimum input vector manipulations needed to realize a given operation's truth table. As such, with the definition of an output amplitude detection threshold separating "0" and "1" results, logic operations can be performed. A digital 2 x 1 multiplexer (MUX) is implemented in a single 4 x 1 MMI coupler where 1 of the 4 inputs serves as a reference input beam. With an input spacing of 40 micron, the 2 x 1 multiplexer has an overall dimension of 160 micron x 2.25 cm. Simple varied-dimension waveguide elements are used to adjust input wave amplitude and phase. To confirm and optimize the designs, device operation is simulated using 2D beam propagation method (BPM).

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

Jiang¹,

Ippen²,

Yokoyama³

Ultrahigh-Speed Optical Transmission Technology

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40-GHz tunable optical pulse generation from a highly stable external-cavity mode-locked semiconductor laser module

Cited by 8 publications

References 5 publications

Optical signal processing using mode-locked semiconductor laser diode

Optical signal processing using mode-locked semiconductor laser diode

Optical interference logic in silicon-on-insulator waveguides

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

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