US-20260128797-A1 - OPTICAL LINK ARCHITECTURE PROVIDING MODULATION OF OPTICAL DATA SIGNALS AFTER FILTERING

US20260128797A1US 20260128797 A1US20260128797 A1US 20260128797A1US-20260128797-A1

Abstract

An optical apparatus, with an optical interconnect, the optical interconnect including a first optical transceiver having a first notch filter, the first notch filter including first and second optical add drop multiplexer demultiplexers connected to receive a continuous wave light beam and send a first and second filtered wavelengths to first and second resonant modulators which send first and send modulated optical signals through a light propagation path. The second filtered wavelength is different from the first filtered wavelength, and the second modulated optical signal has a polarity that is orthogonal to a polarity of the first modulated optical signal. Methods of communicating using the apparatus and an optical filter for use in an optical transceiver are also

Inventors

Benjamin Giles Lee
Meer Nazmus Sakib

Assignees

NVIDIA CORPORATION

Dates

Publication Date: 20260507
Application Date: 20260106

Claims (20)

1 . An optical apparatus, comprising: an optical interconnect, the optical interconnect including: a first optical transceiver, the first optical transceiver including: a first notch filter, the first notch filter including: a first optical add drop multiplexer demultiplexer connected to receive a continuous wave light beam and send a first filtered wavelength of the continuous wave light beam to a first modulator, and a second optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send a second filtered wavelength of the continuous wave light beam to a second modulator, wherein the first modulator is configured to send a first modulated optical signal and the second modulator is configured to send a second modulated optical signal with a polarity that is orthogonal to a polarity of the first modulated optical signal.
2 . The optical apparatus of claim 1 , wherein the optical interconnect further includes: a second optical transceiver, the second optical transceiver including: a second notch filter, the second notch filter including: a third optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send the second filtered wavelength of the continuous wave light beam to a third modulator, and a fourth optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send the first filtered wavelength of the continuous wave light beam to a fourth modulator, wherein the third modulator is configured to send a third modulated optical signal and the fourth modulator is configured to send a fourth modulated optical signal with a polarity that is orthogonal to a polarity of the third modulated optical signal.
3 . The optical apparatus of claim 2 , wherein the first and the second modulators are configured to send the first and the second modulated optical signals in a first direction and the third and the fourth modulators are configured to send the third and the fourth modulated optical signal in a second direction that is different than the first direction.
4 . The optical apparatus of claim 2 , wherein the first optical transceiver is set as one of a receiver or a transmitter and the second optical transceiver is set as the other of the transmitter or the receiver.
5 . The optical apparatus of claim 2 , wherein the first, the second, the third, and the fourth modulators are each resonant modulators.
6 . The optical apparatus of claim 5 , wherein the first resonant modulator includes a first micro-resonant modulator to produce the first modulated optical signal at the first filtered wavelength.
7 . The optical apparatus of claim 5 , wherein the second resonant modulator further includes a second micro-resonant modulator to produce the second modulated optical signal at the second filtered wavelength.
8 . The optical apparatus of claim 5 , wherein the third resonant modulator includes a third micro-resonant modulator to produce the third modulated optical signal at the second filtered wavelength.
9 . The optical apparatus of claim 5 , wherein the fourth resonant modulator includes a fourth micro-resonant modulator to produce the fourth modulated optical signal at the second filtered wavelength.
10 . The optical apparatus of claim 1 , further including one or more photodetectors optically coupled to the first notch filter of the first optical transceiver.
11 . The optical apparatus of claim 1 , further including one or more polarization couplers to optically couple a polarized state of the continuous wave light beam to the first notch filter of the first optical transceiver.
12 . The optical apparatus of claim 1 , wherein the first and second modulated optical signals carry data signals encoded from electrical bit sequences from one or more drivers.
13 . An optical filter, comprising: a first modulator configured to receive a first filtered wavelength of a continuous light beam and send a first modulated optical signal in a first direction along a light propagation path; and a second modulator configured to receive a second filtered wavelength of the continuous wave light beam and send a second modulated optical signal in the first direction, wherein the second modulated optical signal has a polarity orthogonal to a polarity of the first modulated optical signal.
14 . The optical filter of claim 13 , further comprising: a first optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send the first filtered wavelength of the continuous wave light beam to the first modulator; and a second optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send the second filtered wavelength of the continuous wave light beam to the second modulator.
15 . The optical filter of claim 14 , wherein the optical filter is a notch filter.
16 . The optical filter of claim 14 , wherein the first modulator includes a first micro-resonant modulator to produce the first modulated optical signal at the first filtered wavelength.
17 . The optical filter of claim 14 , wherein the second modulator includes a second micro-resonant modulator to produce the second modulated optical signal at the second filtered wavelength.
18 . An optical interconnect, comprising: a first optical add drop multiplexer demultiplexer connected to receive a continuous wave light beam and send a first filtered wavelength of the continuous wave light beam to a first modulator; and a second optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send a second filtered wavelength of the continuous wave light beam to a second modulator, wherein the first modulator is configured to send a first modulated optical signal and the second modulator is configured to send a second modulated optical signal with a polarity that is orthogonal to a polarity of the first modulated optical signal.
19 . The optical interconnect of claim 18 , further comprising: a third optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send the second filtered wavelength of the continuous wave light beam to a third modulator; and a fourth optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send the first filtered wavelength of the continuous wave light beam to a fourth modulator, wherein the third modulator is configured to send a third modulated optical signal and the fourth modulator is configured to send a fourth modulated optical signal with a polarity that is orthogonal to a polarity of the third modulated optical signal.
20 . The optical interconnect of claim 19 , wherein the first modulator and the second modulator are configured to send the first modulated optical signal and the second modulated optical signal in a first direction along a light propagation path and the third modulator and the fourth modulator are configured to send the third modulated optical signal and the fourth modulated optical signal in a second direction along the light propagation path that is opposite of the first direction.

Description

CROSS REFERENCE TO RELATED APPLICATION This application is a continuation of U.S. Application Serial No. 18/474,698, filed by Benjamin Giles Lee, et al., on September 26, 2023, entitled “OPTICAL LINK ARCHITECTURE,” which is commonly assigned with this application and incorporated herein by reference in its entirety. TECHNICAL FIELD This application is directed, in general, to optical communications, and in particular, an optical apparatus including one or more optical interconnects, and, methods of communicating using the optical apparatus. BACKGROUND It is desirable to increase bandwidth density in optical interconnects in a cost- and power-efficient manner. One approach is to use a combination of wavelength-, polarization-, and/or directional-multiplexing. Multiplexing and demultiplexing devices (in wavelength, polarization, and/or directional domains) can combine an array of modulator ports and/or detector ports at two end points of a link into a single medium such as an optical fiber for transmission between the end points. The design of each of these multiplexing and demultiplexing devices, however, often involves an optimization process in which insertion loss is traded against inter-channel crosstalk, as well as other performance metrics. SUMMARY One aspect provides an optical apparatus including an optical interconnect. The optical interconnect includes a first optical transceiver, the first optical transceiver including a first notch filter. The first notch filter includes a first optical add drop multiplexer demultiplexer connected to receive a continuous wave light beam and send a first filtered wavelength of the continuous wave light beam to a first modulator, and a second optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send a second filtered wavelength of the continuous wave light beam to a second modulator, wherein the first modulator is configured to send a first modulated optical signal and the second modulator is configured to send a second modulated optical signal with a polarity that is orthogonal to a polarity of the first modulated optical signal. Another aspect is an optical filter comprising: a first modulator configured to receive a first filtered wavelength of a continuous light beam and send a first modulated optical signal in a first direction along a light propagation path, and a second modulator configured to receive a second filtered wavelength of the continuous wave light beam and send a second modulated optical signal in the first direction, wherein the second modulated optical signal has a polarity orthogonal to a polarity of the first modulated optical signal. Another aspect is an optical interconnect comprising: a first optical add drop multiplexer demultiplexer connected to receive a continuous wave light beam and send a first filtered wavelength of the continuous wave light beam to a first modulator, and a second optical add drop multiplexer demultiplexer connected to receive the continuous wave light beam and send a second filtered wavelength of the continuous wave light beam to a second modulator, wherein the first modulator is configured to send a first modulated optical signal and the second modulator is configured to send a second modulated optical signal with a polarity that is orthogonal to a polarity of the first modulated optical signal. BRIEF DESCRIPTION Reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which: FIG. 1 presents a block diagram of an example embodiment of an optical apparatus of the disclosure; FIG. 2 presents a schematic diagram showing aspects of an example apparatus of the disclosure including a transceiver; FIG. 3 presents a diagram showing a graphical representation of example encoding states of a optical channel communicating an optical signal in a embodiment of the optical apparatus of the disclosure; FIG. 4 presents a schematic diagram showing aspects of another example apparatus of the disclosure including a pair of transceivers; FIG. 5 presents a schematic diagram showing aspects of another example apparatus of the disclosure similar to the apparatus depicted in FIG. 4; FIG. 6 presents a schematic diagram showing aspects of another example apparatus of the disclosure similar to the apparatus depicted in FIG. 5; FIG. 7 presents a schematic diagram showing aspects of another example apparatus of the disclosure similar to the apparatus depicted in FIG. 5; and FIGS. 8A and 8B present a flow diagram of a method of communicating using an optical apparatus such as any embodiments of the apparatuses disclosed in the context of FIGS. 1-7. DETAILED DESCRIPTION Embodiments of the disclosure follow from designing high speed scaling optical interconnects that are simple to implement, and, avoid complex wavelength filtering designs that are both expensive and prone to introducing impairments, e.g., due to the narrow bandwidth of filter shapes o