Delay demodulation devices

Details Delay demodulation devices Delay demodulation devices

2011-07-12

2011-07-12

Sanghavi, Hemang (Department: 2874)

Optical: systems and elements

Optical demodulator

C385S014000, C398S214000

Reexamination Certificate

active

07978401

ABSTRACT:
The delay demodulation device1comprises: an input waveguide2which receives DQPSK signals; a Y-branch waveguide3which splits the input waveguide2; a first Mach-Zehnder interferometer4; and a second Mach-Zehnder interferometer5. Both end of two arm-waveguides8, 9of the first Mach-Zehnder interferometer4and both ends of two arm-waveguides12, 13of the second Mach-Zehnder interferometer5are angled toward the center portion of a planar lightwave circuit (PLC)1A. Because of the angle, the length of the two arm-waveguides8, 9of the first Mach-Zehnder interferometer4and the length of the two arm-waveguides12, 13of the second Mach-Zehnder interferometer5in Z-direction can be shortened, and input couplers6,10and output couplers7,11of each Mach-Zehnder interferometers in Z-direction can be shortened as well. The area occupied by each Mach-Zehnder interferometers4, 5are also reduced.

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U.S. Appl. No. 12/412,932, filed Mar. 27, 2009, Hasegawa, et al.
Hiroshi Takahasi, et al., “PLC Technology-based Modulator and Demodulator for DQPSK”, NTT Technical Journal, vol. 19, No. 11, Nov. 2007, pp. 52-57 (with partial English translation).
Christopher R. Doerr, et al., “Monolithic Demodulator for 40-Gb/s DQPSK Using a Star Coupler”, Journal of Lightwave Technology, vol. 24, No. 1, Jan. 2006, pp. 171-174.

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