Optical network unit for optical transmission in burst mode

Patent metadata

Field	Value
Publication number	US-10461882-B2
Application number	US-201816203665-A
Country	US
Kind code	B2
Filing date	Nov 29, 2018
Priority date	Apr 2, 2018
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

An optical network unit (ONU) for optical transmission in a burst mode includes an electro-absorption modulated laser (EML) transmitter including a laser diode (LD) and configured to transmit an uplink optical signal through the LD, an electro-absorption modulator (EAM) driver integrated circuit (IC) (EAM driver IC) configured to amplify an uplink data signal and provide the amplified data signal to the EML transmitter, an LD burst-mode driving circuit configured to control an operation of turning on or off the LD based on a burst-enable signal, and a media access control (MAC) configured to transmit the data signal to the EAM driver IC and transmit the burst-enable signal to the LD burst-mode driving circuit.

First claim

What is claimed is:

1. An optical network unit (ONU) comprising:
an electro-absorption modulated laser (EML) transmitter comprising a laser diode (LD) and configured to transmit an uplink optical signal through the LD;
an electro-absorption modulator (EAM) driver integrated circuit (IC) (EAM driver IC) configured to amplify an uplink data signal and provide the amplified data signal to the EML transmitter;
an LD burst-mode driving circuit configured to control an operation of turning on or off the LD based on a burst-enable signal; and
a media access control (MAC) configured to transmit the data signal to the EAM driver IC and transmit the burst-enable signal to the LD burst-mode driving circuit,
wherein the LD burst-mode driving circuit comprises:
an operational amplifier (OPAMP) configured to compare an input voltage value and a set voltage value and control the voltage values to be equal;
a current monitoring IC configured to monitor a current value flowing to the EML transmitter and convert the current value to a voltage, and then input the voltage to the OPAMP as the input voltage value;
a first transistor configured to receive the set voltage value from an MCU and receive the burst-enable signal from the MAC, and then input the set voltage value to the OPAMP; and
a second transistor configured to receive a signal output from the OPAMP and allow a current to flow to the EML transmitter.

2. The ONU of claim 1 , further comprising:
a receiver configured to receive a downlink optical signal and convert the received downlink optical signal to a downlink electrical signal; and
a limiting amplifier configured to reamplify the downlink electrical signal received from the receiver and output a downlink data signal,
wherein the MAC is configured to receive the downlink data signal output from the limiting amplifier through the reamplifying.

3. The ONU of claim 1 , further comprising:
a microcontroller unit (MCU) configured to control the EML transmitter and the EAM driver IC.

4. The ONU of claim 1 , wherein the uplink data signal is in a non-return-to-zero (NRZ) form.

5. The ONU of claim 1 , wherein the burst-enable signal is embodied as an electrical signal with a potential difference.

6. The ONU of claim 1 , wherein the LD burst-mode driving circuit further comprises:
a first capacitor configured to perform low-pass filtering before the set voltage value output from the first transistor to be input to the OPAMP is input to the OPAMP.

7. The ONU of claim 1 , wherein the LD burst-mode driving circuit further comprises:
a feedback loop configured to feed an output of the OPAMP back to an input end of the OPAMP receiving the input voltage value,
wherein the feedback loop comprises:
a second capacitor to prevent a rapid change in voltage.

8. An optical network unit (ONU) comprising:
an electro-absorption modulated laser (EML) transmitter comprising a laser diode (LD) and configured to transmit an uplink optical signal through the LD,
an electro-absorption modulator (EAM) driver integrated circuit (IC) (EAM driver IC) configured to amplify an uplink data signal and provide the amplified data signal to the EML transmitter;
an LD burst-mode driving circuit configured to control an operation of turning on or off the LD based on a burst-enable signal; and
a media access control (MAC) configured to transmit the data signal to the EAM driver IC and transmit the burst-enable signal to the LD burst-mode driving circuit,
wherein the LD burst-mode driving circuit comprises:
an OPAMP configured to compare an input voltage value and a voltage value set from an MCU and control the voltage values to be equal;
a current monitoring IC configured to monitor a current value flowing to the EML transmitter and convert the current value to a voltage, and then input the voltage to the OPAMP as the input voltage value;
a first transistor configured to receive a signal output from the OPAMP and receive the burst-enable signal from the MAC, and then output an electrical signal; and
a second transistor configured to receive the electrical signal output from the first transistor and allow a current to flow to the EML transmitter.

9. The ONU of claim 8 , wherein the LD burst-mode driving circuit further comprises:
a first capacitor configured to perform low-pass filtering before the electrical signal output from the first transistor is input to the second transistor.

10. The ONU of claim 8 , wherein the LD burst-mode driving circuit further comprises:
a feedback loop configured to feed an output of the OPAMP back to an input end of the OPAMP receiving the input voltage value,
wherein the feedback loop comprises:
a second capacitor to prevent a rapid change in voltage.

11. The ONU of claim 8 , further comprising:
a receiver configured to receive a downlink optical signal and convert the received downlink optical signal to a downlink electrical signal; and
a limiting amplifier configured to reamplify the downlink electrical signal received from the receiver and output a downlink data signal,
wherein the MAC is configured to receive the downlink data signal output from the limiting amplifier through the reamplifying.

12. The ONU of claim 8 , further comprising:
a microcontroller unit (MCU) configured to control the EML transmitter and the EAM driver IC.

13. The ONU of claim 8 , wherein the uplink data signal is in a non-return-to-zero (NRZ) form.

14. The ONU of claim 8 , wherein the burst-enable signal is embodied as an electrical signal with a potential difference.

15. A laser diode (LD) burst-mode driving circuit of an optical network unit (ONU), comprising:
an operational amplifier (OPAMP) configured to compare an input voltage value and a set voltage value and control the voltage values to be equal;
a current monitoring integrated circuit (IC) configured to monitor a current value flowing to an electro-absorption modulated laser (EML) transmitter and convert the current value to a voltage, and then input the voltage to the OPAMP as the input voltage value;
a first transistor configured to receive the set voltage value from a microcontroller unit (MCU) and receive a burst-enable signal from a media access control (MAC), and then input the set voltage value to the OPAMP; and
a second transistor configured to receive a signal output from the OPAMP and allow a current to flow to the EML transmitter.

16. The LD burst-mode driving circuit of claim 15 , further comprising:
a first capacitor configured to perform low-pass filtering before the set voltage value output from the first transistor to be input to the OPAMP is input to the OPAMP.

17. The LD burst-mode driving circuit of claim 15 , further comprising:
a feedback loop configured to feed an output of the OPAMP back to an input end of the OPAMP receiving the input voltage value,
wherein the feedback loop comprises:
a second capacitor to prevent a rapid change in voltage.

18. A laser diode (LD) burst-mode driving circuit of an optical network unit (ONU), comprising:
an operational amplifier (OPAMP) configured to compare an input voltage value and a voltage value set from a microcontroller unit (MCU) and control the voltage values to be equal;
a current monitoring integrated circuit (IC) configured to monitor a current value flowing to an electro-absorption modulated laser (EML) transmitter and convert the current value to a voltage, and then input the voltage to the OPAMP as the input voltage value;
a first transistor configured to receive a signal output from the OPAMP and

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Lee Han Hyub
• Chung Hwan Seok

Classifications

• H04B10/504

  using direct modulation · CPC title

• H04B10/40 Primary

  Transceivers · CPC title

• H04J14/0227

  Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation · CPC title

• H04J3/1694 Primary

  Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062) · CPC title

• H04J14/0278 Primary

  WDM optical network architectures · CPC title