Low-power all-optical switching in active semiconductor chirped periodic structures

Maywar, Drew N.; Agrawal, Govind P.

doi:10.1364/oe.3.000440

Cited by 18 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The holdingbeam wavelength was limited to a range of 0.004 nm to achieve flip-flop operation. We expect that this spectral range can be increased by using a chirped-grating DFB SOA [9]. Moreover, precise control of the holding-beam wavelength can be achieved by integrating the laser onto the same chip as the DFB SOA, writing both gratings with an electron beam.…”

Section: All-optical Flip-flop Operationmentioning

confidence: 99%

“…The physical limit to the speed of SOA devices is often governed by the carrier recombination lifetime, which can be as low as 200 ps using a high carrier density [12]. High densities can be achieved in DFB SOAs by using spatially chirped gratings, because of an increase in the lasing threshold [9]. In addition, a strong, auxiliary, gain-saturating signal has been used in SOAs to reduce the lifetime to ∼10 ps [13].…”

Section: Robustness Of Control Signalsmentioning

confidence: 99%

See 1 more Smart Citation

Robust optical control of an optical-amplifier-based flip-flop

Maywar¹,

Agrawal²,

Nakano³

2000

Opt. Express

Self Cite

View full text Add to dashboard Cite

We demonstrate new optical techniques for externally controlling the latchable output power of a semiconductor-optical-amplifier-based flip-flop. Optical 'set' and 'reset' signals increase and decrease the re-fractive index, respectively, via cross-phase modulation (XPM). Set signals, which deplete the carrier density, have wavelengths between 1533 and 1568 nm, and powers as low as 22 microW. Reset is performed with carrier-generating 'positive' optical pulses at 1306 and 1466 nm, and minimum powers below 1 mW. These techniques are useful for digital optical-processing functions such as bit-length conversion, retiming, and demultiplexing.

show abstract

Section: All-optical Flip-flop Operationmentioning

confidence: 99%

Section: Robustness Of Control Signalsmentioning

confidence: 99%

Robust optical control of an optical-amplifier-based flip-flop

Maywar¹,

Agrawal²,

Nakano³

2000

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…As mentioned above, the variations in chirping can either increase (positively chirped) or decrease (negatively chirped) the spatial frequency along the propagation direction (z) (See Refs. [53][54][55][56][57] and therein). In this article, we investigate the optical bistability features exhibited by a chirped PTFBG (CPTFBG) whose nonlinear RI is modulated over the propagation distance, and from here onwards we denote the corresponding term by n K or call it as modulated Kerr nonlinearity term.…”

Section: Introductionmentioning

confidence: 94%

Low-power optical bistability in $\mathcal{PT}$-symmetric chirped Bragg gratings with four-wave mixing

Sudhakar,

Raja,

Govindarajan

et al. 2022

Preprint

View full text Add to dashboard Cite

The central theme of this article is the analysis of the usefulness of introducing four-wave mixing or modulation of Kerr nonlinearity in a nonuniform grating structure with gain and loss. To do so, we propose an inhomogeneous system in which the nonlinearity of the P T -symmetric grating is modulated. It is proven that the proposed scheme can be fruitful only if the nonlinearity and its associated modulation terms are assumed to be self-defocusing ones. In order to cut down the intensity required for the steering, the sign of chirping is taken to be negative and the wavelength of operating light is considered to be higher than the Bragg wavelength. Alongside these settings, launching the light from the rear end of the device dramatically reduces the critical intensity to a value of 0.015 (approximately) which must be the lowest switching intensity ever reported in the context of nonlinear P T -symmetric gratings. The ramplike stable states in the broken P T -symmetric regime prevail even in the company of modulation in the nonlinearity index for both of the light incident directions.

show abstract

“…Since the control signals act in a remote fashion, the particular flip-flop used in our experiment can be replaced with, in principle, any holding-beamenabled flip-flop. Using a distributed-feedback SOA instead of an FP-SOA, for example, would have several advantages, including the capacity for integration into a monolithic photonic circuit and the ability to improve the switching contrast by introducing grating nonuniformities [14,15].…”

mentioning

confidence: 99%

Remote optical control of an optical flip-flop

2007

View full text Add to dashboard Cite

We experimentally demonstrate control of a holding-beam-enabled optical flip-flop by means of optical signals that act in a remote fashion. These optical-control signals vary the holding-beam power by means of cross-gain modulation within a remotely located semiconductor optical amplifier (SOA). The power-modulated holding beam then travels through a resonant-type SOA, where flip-flop action occurs as the holding-beam power falls above and below the switching thresholds of the bistable hysteresis. Control is demonstrated using submilliwatt pulses whose wavelengths are not restricted to the vicinity of the holding beam. Benefits of remote control include the potential for controlling multiple flip-flops with a single pair of optical signals and for realizing all-optical control of any holding-beam-enabled flip-flop.

show abstract

Low-power all-optical switching in active semiconductor chirped periodic structures

Cited by 18 publications

References 18 publications

Robust optical control of an optical-amplifier-based flip-flop

Robust optical control of an optical-amplifier-based flip-flop

Low-power optical bistability in $\mathcal{PT}$-symmetric chirped Bragg gratings with four-wave mixing

Remote optical control of an optical flip-flop

Contact Info

Product

Resources

About