Integrated-optic device for high-speed data buses

Thylén, Lars; Djupsjöbacka, A.; Janson, Malgorzata; Döldissen, W.

doi:10.1364/ofc.1985.md5

Optical Fiber Communication 1985

DOI: 10.1364/ofc.1985.md5

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Integrated-optic device for high-speed data buses

Lars Thylén

A. Djupsjöbacka

Malgorzata Janson³

et al.

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1989

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“…Also of importance for integrated structures is the intercoupler crosstalk, which is the interference between two or more switch elements on a single substrate. Such interdevice crosstalk has been studied for phase modulators [4], [5] and for directional couplers at a single frequency [6], [71.…”

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Crosstalk measurements of integrated high-speed Ti:LiNbO/sub 3/ Delta beta -reversal switching circuits

Veselka

Herr

Murphy

et al. 1989

J. Lightwave Technol.

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We report the measurement of directional coupler crosstalk at multigigahertz frequencies using an optical sampling method for improved sensitivity. At both 2-and 4-GHz switching frequency, the crosstalk in both switch states of the coupler was 5 -19 dB for an element of a 1 x 4 switch array intended for time-division-multiplexing applications. We also report measurements of intercoupler crosstalk for this switch array.PTICAL-time-division-multiplexing (OTDM) sys-0 tems require high-speed optical switches to demultiplex two or more channels. Critical to the performance of an OTDM system incorporating optical switches is the crosstalk in each 2 X 2 directional coupler crosspoint. This coupler crosstalk is a measure of how well the switch states, straight-through and crossover, can be achieved. To date, integrated 1 X 4 Ti : LiNb03 switch arrays have been investigated for use at line rates of up to 1.6 Gbits/s [l], [2]. Others in our group have demonstrated a 16-Gbits/s line rate OTDM system using hybrid Ti : LiNb03 2 x 2 directional coupler switches to demultiplex down to four 4 Gbits/s channels [3]. Also of importance for integrated structures is the intercoupler crosstalk, which is the interference between two or more switch elements on a single substrate. Such interdevice crosstalk has been studied for phase modulators [4], [5] and for directional couplers at a single frequency [6], [71.We report here measurements of the coupler crosstalk and of the intercoupler crosstalk at multigigahertz rates. Our measurements were made using a 1 X 4 switch array illustrated in Fig. 1. The device was designed for 1.3-pm wavelength and consists of three traveling-wave A@-reversa1 directional coupler switches each similar in design to the crosspoint previously described [8]. We have chosen the intenvaveguide gap ( -6 pm) of the 1-cm-long coupling regions so as to obtain two-coupling-length crosspoints, and thereby minimize the single-pole voltage swing required to change optical states. This choice also reduces the sensitivity of the required drive voltage to fabrication variations of the coupling length. The width of the center electrode of the coplanar waveguide transmission line, Fig. l(b) was 8 pm, the gaps to the ground lines Manuscript received September 14, 1988. The authors are with AT&T Bell Laboratories, Holmdel, NJ 07733. IEEE Log Number 8926568.(b) Fig. 1. Integrated 1 X 4 Ti : LiNb03 switch circuit. (a) Schematic of device. (b) Detail of traveling-wave Ab-reversal electrode.were 7 pm, and the ground lines were 100 pm wide. The switching voltages of the three crosspoints on the array were in the range of 9.5 to 9.8 V. Measurements of the coupler crosstalk under DC operation for the three couplers yielded values of -14.6 to -19.7 dB optical (dBO) for the straight-through state and -25.3 to -28 dBO for the crossover state.To measure coupler crosstalk in the crossover and straight-through optical states at multigigahertz drive frequencies, we used a wide dynamic-range optical sampling system similar to that used for hi...

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confidence: 99%

“…NO. 6 talk at multigigahertz frequencies. At 2 and 4 GHz we measured coupler crosstalk, of respectively, -18.5 dBO and -19.5 dBO in both switch states.…”

mentioning

confidence: 99%

Crosstalk measurements of integrated high-speed Ti:LiNbO/sub 3/ Delta beta -reversal switching circuits

Veselka

Herr

Murphy

et al. 1989

J. Lightwave Technol.

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show abstract

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Integrated-optic device for high-speed data buses

Cited by 1 publication

References 1 publication

Crosstalk measurements of integrated high-speed Ti:LiNbO/sub 3/ Delta beta -reversal switching circuits

Crosstalk measurements of integrated high-speed Ti:LiNbO/sub 3/ Delta beta -reversal switching circuits

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