Optical ring circuit with electrical filter

Patent metadata

Field	Value
Publication number	US-10838282-B2
Application number	US-201816124344-A
Country	US
Kind code	B2
Filing date	Sep 7, 2018
Priority date	May 4, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

An optical ring circuit for modulating light from a light source into an optical signal includes a ring modulator located near a waveguide to couple a light propagating the waveguide, the ring modulator including a pair of electrodes, a signal generator to transmit an electrical signal corresponding to the optical signal, a filter circuit to generate an output signal, wherein the filter circuit includes an adder unit and at least one tap unit having a delay unit and a coefficient unit, wherein the adder unit adds the electrical signal from the signal generator and a signal passed from the tap unit for pre-compensating signal components of the electrical signal by at least twice delay time of the delay unit, and a driver circuit to apply a voltage to the electrodes based on the output signal.

First claim

We claim:

1. An optical ring circuit for modulating light from a light source into an optical signal, comprising:
a ring modulator located near a waveguide to couple light propagating the waveguide, the ring modulator including a pair of electrodes;
a signal generator to transmit an electrical signal corresponding to the optical signal;
an infinite impulse response filter circuit to generate an output signal, wherein the filter circuit includes an adder unit and at least one tap unit having a delay unit and a coefficient unit, wherein the adder unit is configured to receive and add the non-delayed electrical signal from the signal generator and a modified feedback signal passed through the delay unit and the coefficient unit in the at least one tap unit for pre-compensating signal components of the electrical signal by at least twice delay time of the delay unit; and
a driver circuit to apply a voltage to the electrodes based on the output signal.

2. The optical ring circuit of claim 1 , wherein the filter circuit comprises an Infinite Impulse Response filter including one or more tap units.

3. The optical ring circuit of claim 1 , wherein the filter circuit comprises a Finite Impulse Response filter including two or more tap units, wherein the adder unit and the tap units are arranged in parallel.

4. An optical ring modulator for modulating light from a light source into an optical signal, comprising:
a ring modulator located near a waveguide to couple light propagating the waveguide, the ring modulator including a pair of electrodes;
a signal generator to transmit an electrical signal corresponding to the optical signal;
an infinite impulse response filter circuit to generate an output signal, wherein the filter circuit includes an adder unit, a first coefficient unit, and at least one tap unit having a delay unit and a second coefficient unit, wherein the adder unit is configured to receive and add a non-delayed signal from the signal generator and a first modified feedback signal passed from the first coefficient unit and a second modified feedback signal passed from the delay unit and the second coefficient unit in the at least one tap unit for pre-compensating signal components of the electrical signal by at least twice delay time of the delay unit; and
a driver circuit to apply a voltage to the electrodes based on the output signal.

5. The optical ring modulator of claim 4 , wherein the filter circuit comprises an Infinite Impulse Response filter including one or more tap units.

6. The optical ring modulator of claim 4 , wherein the filter circuit comprises a Finite Impulse Response filter including two or more tap units, wherein the adder unit and the tap units are arranged in parallel.

Assignees

• Mitsubishi Electric Res Laboratories Inc
• Mitsubishi Electric Corp

Inventors

• Kojima Keisuke
• Teng Min
• Koike-Akino Toshiaki
• Lin Chungwei
• Parsons Kieran
• Gotoda Mitsunobu
• Akiyama Koichi

Classifications

• G02F1/2257 Primary

  the optical waveguides being made of semiconducting material · CPC title

• G02F2203/15

  involving resonance effects, e.g. resonantly enhanced interaction · CPC title

• G02F1/0121 Primary

  Operation of devices; Circuit arrangements, not otherwise provided for in this subclass · CPC title

• H03H17/06

  Non-recursive filters · CPC title

• H03H17/04

  Recursive filters · CPC title