Light ring modulator
A technology of modulators and halos, applied in instruments, optics, nonlinear optics, etc.
Pending Publication Date: 2022-06-10
ROCKLEY PHOTONICS INC
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However, when modulators are scaled up from PAM-4 to other PAM-N systems, the requirement for different electrode sizes becomes more complicated as the ring resonator eventually runs out of space
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[0031] While the invention has been described in conjunction with the above described exemplary embodiments, many equivalent modifications and variations will be apparent to those skilled in the art when given this disclosure. Accordingly, the exemplary embodiments of the present invention set forth above are to be considered as illustrative and not restrictive. Various changes may be made to the described embodiments without departing from the spirit and scope of the invention.
[0032] All references mentioned above are incorporated herein by reference.
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Abstract
An optical ring modulator for use as a PAM-N modulator, the optical ring modulator comprising: a first optical waveguide forming a bus waveguide; a ring waveguide, the ring waveguide being optically coupled to the bus waveguide; wherein the ring waveguide comprises: a first electrode region having a first pn junction or a first Moscp, the first pn junction or the first Moscp being configured to generate a first phase shift when a given voltage is applied across the first pn junction or the first Moscp; and a second electrode region having a second pn junction or a second Moscapp, the second pn junction or the second Moscapp configured to generate a second phase shift when the given voltage is applied across the second pn junction or the second Moscapp, where the second phase shift is less than the first phase shift.
Description
technical field [0001] One or more aspects of embodiments according to the present invention relate to an optical ring modulator, and more particularly, to an optical ring modulator including at least first and second electrode regions. Background technique [0002] Silicon microring modulators are used in transmitters with advanced modulation formats, especially PAM-4 modulation. Many silicon microring modulators use a single drive electrode. For a single driven electrode, the modulator is inherently nonlinear, which requires complex power-hungry drivers to compensate. [0003] Dual drive versions are known (see for example US 9,784,995) in which the ring modulator comprises two electrodes of different lengths, such that the length of one electrode is approximately twice the length of the first electrode. However, when modulators are scaled up from PAM-4 to other PAM-N systems, the requirement for different electrode sizes becomes more complicated because the ring resonat...
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IPC IPC(8): G02F1/015G02F1/025
CPCG02F1/015G02F1/0154G02F1/025G02F2203/15G02F1/2257
Inventor A·斯科菲尔德
Owner ROCKLEY PHOTONICS INC