Showing papers by "Barry Miller published in 1999"
Patent•
02 Feb 1999TL;DR: In this article, a unitary two-section optical amplifier including a first active region, a second active region and a passive region integrally connected between the first and second active regions is proposed to minimize optical loss there between.
Abstract: A unitary two-section semiconductor optical amplifier including a first active region, a second active region, and a passive region integrally connected between the first and second active regions to minimize optical loss therebetween. The arrangement of the two-section semiconductor optical amplifier is advantageous in that the gain in the first active region may be increased in order to maintain a substantially constant input power level to the second active region over a relatively wide dynamic range of input power levels to the first active region.
39 citations
21 Feb 1999
TL;DR: In this article, a novel optical translator that can perform 3R-regeneration and wavelength conversion of high-speed return-to-zero signals is demonstrated at 20 Gbit/s.
Abstract: A novel optical translator that can perform 3R-regeneration and wavelength conversion of high-speed return-to-zero signals is demonstrated at 20 Gbit/s. Efficient retiming and bit-error-rate performance is measured using a Mach-Zehnder interferometer with integrated semiconductor optical amplifiers.
16 citations
TL;DR: In this article, a double-etch design was proposed to increase the coupling between the two tapered Y-branch waveguides, which allows for efficient switching while decreasing the radiation loss that arises from the branching angle.
Abstract: We demonstrate a novel Y-branch digital switch with a double-etch waveguide structure to greatly enhance the loss and crosstalk performance. The double-etch design increases the coupling between the two tapered Y-branch waveguides, which allows for efficient switching while decreasing the radiation loss that arises from the branching angle. This combined advantage also allows us to reduce the switch length, which in turn results in an efficient high-speed design. The measured crosstalk and loss are -19 and 3 dB, respectively, for a 3-mm-long switch. Further crosstalk reduction is expected from the simulation of a more optimized design.
15 citations
TL;DR: In this article, a high-speed and wavelength insensitive Y-branch modulator was proposed for InGaAsP multiple-quantum-wells that exhibits negligible chirp.
Abstract: We propose and demonstrate a novel high-speed and wavelength insensitive Y-branch modulator in InGaAsP multiple-quantum-wells that exhibits negligible chirp and is also suitable for achieving controllable chirp. We raise the refractive index on one arm via applied bias and use the unbiased arm as a modulator. As the light switches to the biased arm, the modulated light in the unbiased arm experiences little phase change and therefore exhibits negligible chirp. Tunable chirp may be achieved using a push-pull bias configuration. We demonstrate that our modulator chirp is /spl sim/10 times lower than that of typical electroabsorption modulators.
7 citations
TL;DR: An integrated high-speed 1 × 4 switch array on InP-substrate using 8 GHz Y-branch switch elements is described, suitable for optical time division multiplexing (OTDM) and demultiplexing data at 10 Gbit/s over a wide optical bandwidth.
Abstract: An integrated high-speed 1 × 4 switch array on InP-substrate using 8 GHz Y-branch switch elements is described. This switch array is suitable for optical time division multiplexing (OTDM) and demultiplexing data at 10 Gbit/s over a wide optical bandwidth. The channel-channel isolation and insertion loss are 18 and 15 dB, respectively, which may be improved by optimisation of the switch design and fabrication techniques.
5 citations
21 Feb 1999
Abstract: We demonstrate superior cascadability performance of bit-rate transparent all-optical interferometric wavelength translators compared to optoelectronic translators. For a translator bandwidth of /spl sim/2 times the bit rate, 9 optoelectronic and 75 all-optical translators can be cascaded.
4 citations
TL;DR: In this article, a 1 × 2 digital optical switch in InGaAsP multiple-quantum-wells with an 8 GHz bandwidth is demonstrated, which may also be operated as a wavelength-, polarisation-, and drive-voltage insensitive modulator.
Abstract: A 1 × 2 digital optical switch in InGaAsP multiple-quantum-wells with an 8 GHz bandwidth is demonstrated, which may also be operated as a wavelength-, polarisation-, and drive-voltage insensitive modulator. The total length of the switch/modulator device is 3 mm which includes passive fan-outs for fibre interconnection. The on-chip insertion loss is 3 dB out of which the Y-branch excess loss is only 0.7 dB. The measured switch crosstalk is –18 dB for a 4 V push-pull bias. Further crosstalk reduction is expected from a more optimised design and improved fabrication processes.
2 citations
01 Jan 1999
TL;DR: In this paper, a novel optical translator that can perform 3R re-eneration and wavelength conversion of high speed return-to-zero signals is demonstrated at 20 Gbit/s.
Abstract: A novel optical translator that can perform 3R-regeneration and wavelength conversion of high speed return-to-zero signals is demonstrated at 20 Gbit/s. Efficient retiming and BER performance is measured using an Mach-Zehnder interferometer with integrated semiconductor optical amplifiers (SOAs).
TL;DR: In this article, the authors showed the real-time dynamic chirp measured in frequency for the unbiased and biased ports are shown in Fig. 3(a) and (b), respectively.
Abstract: In the above-named letter [ibid., vol. 11, pp. 1129?1131, Sept. 1999] Fig. 3 was incorrect. The correct figure showing the chirp measurement at 2.5 Gb/s of the Y-branch modulator along with the data pattern is shown in the revised Fig. 3. The realtime dynamic chirp measured in frequency for the unbiased and biased ports are shown in Fig. 3(a) and (b), respectively. The peak-to- peak frequency deviation in the unbiased port is only 0.2 GHz, whereas the peak-to-peak frequency deviation in the biased port is 3 GHz.