Wavelength-tunable Optical Short Pulses Research Articles

Wavelength-tunable optical short pulses with high sidemode suppression ratio generated by use of Bi-EDFA

A bidirectional erbium-doped fiber amplifier (Bi-EDFA) has been used in a self-seeding scheme for wavelength-tunable optical short pulse generation. The pulse wavelength is selected and purified by use of two tunable Fabry-Perot (FP) optical filters with bandwidth of 0.11 nm and 99 pm respectively, while a constant repetition frequency of 1.045 GHz is maintained. The sidemode suppression ratio (SMSR) of the output pulses achieved is better than 40 dB over the wavelength tuning range of 33 nm. The system is simple and efficient, and a continuous wavelength tuning can be readily achieved.

Generation of continuously wavelength-tunable optical short pulses by use of two self-seeded Fabry–Perot laser diodes and an optical switch

Generation of wavelength-tunable optical short pulses by use of two self-seeded Fabry-Perot laser diodes in a parallel configuration is described. The system supports continuous wavelength tuning in a relatively wide range of 42 nm. The side-mode suppression ratio achieved is 35 dB across the entire wavelength tuning range. The system is convenient for continuous wavelength tuning.

Wavelength-tunable optical short pulse generation with constant repetition frequency and pulsewidth

A system to generate wavelength-tunable optical short pulses with a constant repetition frequency and pulse width by a gain-switched Fabry-Pérot laser diode (FPLD) in a self-injection scheme is demonstrated. A variable optical delay line is used to control the self-injection scheme to maintain a constant repetition frequency and pulse width at different wavelengths. The optical sidemode suppression ratio (SMSR) of this system is better than 33 dB over the wavelength-tunable range of 33 nm.

Continuous wavelength-tunable optical short-pulse generation by use of two Fabry–Perot laser diodes in a mutual injection-seeding scheme

A simple system for producing continuous and widely wavelength-tunable optical short pulses in a mutual injection-seeding scheme is presented. The system exhibits a good side-mode suppression ratio of greater than 32.7 dB over a large wavelength tuning range of 33.8 nm. The system is easy to operate and convenient for continuous wavelength tuning.

Generation of continuous wavelength-tunable optical short pulses with two Fabry-Pérot laser diodes in an external injection-seeding scheme

We have developed an external-injection seeding system to generate continuous wavelength-tunable optical short pulses with a side-mode suppression ratio of more than 28 dB over a wavelength-tuning range of 21.2 nm. The system consists of two Fabry-Perot laser diodes, one of which is gain switched and another that is dc biased; two tunable optical filters; an erbium-doped optical-fiber amplifier; and a circulator. The system is simple, easy to operate, and robust and may be used in wavelength-division-multiplexed optical-communication systems and in time-division multiplexing of spectroscopic gas sensors.

Combined mutual pulse injection-seeding and active mode locking system for wavelength tunable optical short pulse generation

A combined system to support simultaneous two way mutual pulse injection-seeding and active mode-locking schemes for wavelength tunable optical short pulse generation is presented. The system consists of two gain-switched Fabry-Pérot laser diodes, a bidirectional erbium-doped fiber amplifier, and a tunable optical filter and a coupler. The optical pulses generated exhibits a good stability, a high side-mode suppression ratio of more than 30 dB over a wide wavelength tuning range of 41 nm. The pulse width obtained is ~45 ps at the repetition frequency of around 2571.61 MHz.

Generation of wavelength-tunable optical short pulses with a highly improved side-mode-suppression ratio over a large wavelength-tuning range

We have developed a self-seeding system to generate wavelength-tunable optical short pulses with a highly improved side-mode-suppression ratio (SMSR) over a large wavelength-tuning range. The external cavity of the gain-switched Fabry–Perot laser diode consists of two fiber Bragg gratings (FBGs) connected in series, an erbium-doped fiber amplifier (EDFA), an optical coupler, and two circulators. The two gratings exhibit distinct peak wavelengths and each can be tuned across nearly the 20-nm range. The system is simple and efficient and the side-mode-suppression ratio achieved is about 40 dB over a 24-nm wavelength-tuning range. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 395–399, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20998

Simple self-seeding scheme for generation of wavelength-tunable optical short pulses

A simple and efficient system for generating wavelength-tunable optical short pulses from a self-seeded, gain-switched Fabry–Perot laser diode is presented. The laser’s external cavity consists only of a tunable optical filter. The side-mode suppression ratio is better than 30 dB over a relatively wide wavelength-tuning range of 26 nm. In addition, a constant repetition frequency of 534.65 MHz can be maintained during wavelength tuning.

Wavelength tunable optical short pulse generation by self-seeding of a gain-switched Fabry–Pérot laser diode with extended wavelength-tuning range

Wavelength tunable optical short pulse generation by the use of a gain-switched Fabry–Pérot laser diode in a simple self-seeding scheme is presented. The laser external cavity consists of a tunable filter, two circulators and an erbium-doped fiber amplifier, which provides a wavelength selective and intensity controllable feedback to the laser diode. Sidemode suppression ratio of the output pulses obtained is close to or larger than 30 dB over a relatively wide wavelength-tuning range of 30 nm.

Wavelength-tunable optical short-pulse generation by mutual pulse injection seeding of two gain-switched Fabry-Perot laser diodes.

A simple and robust system is presented to generate wavelength-tunable optical short pulses by use of two gain-switched Fabry-Perot laser diodes in a mutual pulse injection-seeding scheme. The operating wavelength of the optical pulses is flexibly selected by adjustment of a tunable filter, and its intensity is enhanced with an erbium-doped fiber amplifier. The side-mode suppression ratio achieved by the system is larger than 26 dB over a wavelength region of 25 nm and higher than 31 dB within an 18-nm wavelength.

Mutual pulse injection seeding by the use of two fabry-Perot laser diodes to produce wavelength-tunable optical short pulses

A mutual pulse injection-seeding scheme is developed to produce wavelength-tunable optical short pulses by the use of two Fabry-Perot laser diodes, of which one is gain-switched and the other is dc biased. Wavelength tuning of the optical pulses is achieved by simply adjusting a tunable optical filter while maintaining a constant repetition frequency of 3.0 GHz. The sidemode suppression ratio obtained is more than 30 dB over the wavelength-tuning range of 19 nm. The system is simple and robust.

Electrically wavelength‐tunable optical short‐pulse generation in a self‐seeding scheme with intensity controllable feedback

AbstractA simple and robust system is presented to generate electrically wavelength‐tunable optical short pulses from a gain‐switched Fabry–Perot laser diode. The laser external cavity consists of a tunable filter and an erbium‐doped fiber amplifier, which provides wavelength selectivity and intensity controllable feedback. As a result, a side mode suppression ratio SMSR of better than 30 dB over the wavelength tuning range of 17.5 nm can be obtained. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 98–99, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10982

Generation of electrically wavelength-tunable optical short pulses using a Fabry-Perot laser diode in an external-injection seeding scheme with improved sidemode suppression ratio

Electrically wavelength-tunable optical short pulses are generated from a gain-switched Fabry-Perot (F-P) laser diode with another F-P laser diode used as the external-injection-seeding light source. The injection wavelength is selected by a tunable filter and intensified by the use of an erbium-doped fiber amplifier before being directed to the gain-switched F-P laser diode. The sidemode suppression ratio achieved is better than 25 dB over the wavelength-tuning range of 9 nm. The system is simple and of low cost.