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Indeed as the SOA gain is saturated, input pulses with different power are practically amplified to the same limiting value (see Fig. The amplitude equalization process can be qualitatively described as a limiting effect due to the saturation of the SOA gain ruled by the semiconductor gain dynamics. Scheme of the limiting amplification in a saturated SOA. In section 4 we draw the conclusions.įig. In section 3, we study the case of 20 and 40 GHz pulses affected by different amounts of amplitude modulations at varying the modulation frequency (in a wide range from 100 kHz to several GHz) and discuss the experimental results. In section 2, we introduce the scheme and describe its working principle. In this paper, we finally report a detailed experimental characterization. However, an extended characterization of the scheme to fully address its potentialities was not presented yet. In the extension to the case of a packet switched environment was introduced using a modified scheme. In this principle was used to reduce the pattern effects in 10, and 40 GHz clock recovery circuits. In this paper we show that the SOA saturation can be usefully exploited in a very simple optical circuit working at low input power.
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Up to date, several techniques were proposed for power limiting, but, they are generally complex, and/or require high optical powers (>20 dBm) as in. For example, it could help to attenuate spurious amplitude modulations in mode-locked lasers or to equalize pulse trains in all-optical clock recovery sub-systems in circuit or packet switched networks. An all-optical power limiter can be useful in a number of applications where it is necessary to reduce the amplitude jitter of periodic pulses. One possible application of this feature is the realization of an all-optical power limiting function for short-pulse trains.
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#Tajima pulse recipes free#
In case of periodic signals the saturation effects in SOAs can be usefully exploited working free from usual pattern-related effects.
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On the other hand, signal distortions related to the semiconductor inter-band gain dynamics often require to adopt involved interferometric or differential architectures to work at multi-gigabit data rates. Semiconductor Optical Amplifiers (SOAs), which show high nonlinearity in the saturation regime in compact devices, are largely employed in the realization of various all-optical functions. Introductionįuture transmission systems and networks will strongly benefit from the introduction of new circuits and functionalities implemented directly in the optical domain. We report very large amplitude-modulation-reduction factors for the case of 20 and 40 GHz pulse trains that are super-imposed with modulating frequencies ranging from 100kHz to several GHz. We experimentally demonstrate that this simple optical circuit can be effectively exploited to realize a low-power optical limiter for amplitude-modulated pulse trains at multi-GHz repetition rate. We study the limiting-amplification capability of a saturated Semiconductor Optical Amplifier (SOA) followed by an optical band-pass filter. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith.For best results, use the separate Authors field to search for author names.Use quotation marks " " around specific phrases where you want the entire phrase only.Question mark (?) - Example: "gr?y" retrieves documents containing "grey" or "gray".Asterisk ( * ) - Example: "elect*" retrieves documents containing "electron," "electronic," and "electricity".Improve efficiency in your search by using wildcards.Example: (photons AND downconversion) - pump.Example: (diode OR solid-state) AND laser.Note the Boolean sign must be in upper-case. Separate search groups with parentheses and Booleans.Keep it simple - don't use too many different parameters.