# US 12,015,244 B2 · DFB laser DC-coupled output power configuration scheme with adjustable voltage difference

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- Number: US 12,015,244 B2
- Document ID: US12015244B2
- Status: Granted
- Kind: B2
- Application number: 18/004,054
- Filed: 2021-12-24
- Published: 2024-02-08
- Granted: 2024-06-18
- Earliest claimed: 2021-12-16
- Applicants: Xiamen Eochip Semiconductor Co., Ltd
- Inventors: Jinghu Li; Zhang Fan; Liangqiong Shi; Weitan Yao; Weiyin Zheng; Hanghui Tu
- Web page: https://patentgrep.com/patent/US12015244B2

## CPC

- H01S 5/06203: {Transistor-type lasers (H01S5/0608 takes precedence)}
- H01S 5/0427: {for applying modulation to the laser}
- H02M 1/092: the control signals being transmitted optically
- H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators
- H01S 5/06832: {Stabilising during amplitude modulation}
- H01S 5/12: the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers (comprising a photonic bandgap structure H01S5/11; surface-emitting lasers H01S5/18)
- H04B 10/40: Transceivers
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H04B: TRANSMISSION
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A DFB laser DC-coupled output power configuration scheme with adjustable voltage difference. utilizes an external or internal power configuration unit to provide two electric DC power supplies with a fixed voltage difference for the transmitting unit TX of the DFB laser and the optical transceiver integrated chip, and at the same time optimizes the transmitting unit TX. The optimization scheme is that: the transistors in the transmitting unit TX are all low-voltage high-speed tubes, the transmitting unit TX includes a negative capacitance structure composed of capacitors C1 and C2, serving as an auxiliary structure for improving bandwidth. After optimization, the minimum voltage of the power supply voltage port TVCC of the transmitting unit TX is 2.7V and the problems that the output eye diagram is severely cracked and cannot be used when the traditional DFB laser configuration scheme with an external 3.3V power supply is tested at high temperature are solved.

## Claims

### Claim 1

A DFB laser DC-coupled output power configuration scheme with adjustable voltage difference, characterized in that, said power configuration scheme comprising: an external power configuration unit for providing two electric DC power supplies with a fixed voltage difference for a DFB laser and a transmitting unit TX of an optical transceiver integrated chip, said external power configuration unit comprises a DC voltage source VDC3.3V and a LDO-like (low dropout-like) stabilizer, and said LDO-like stabilizer comprises a resistor R5, a resistor R6, a resistor R12, a resistor R13, a PMOS power resistor MP and an operational amplifier AMP;
one end of the resistor R6 is simultaneously connected to one end of the resistor R5 and the inverting input terminal of the operational amplifier AMP;
a non-inverting input terminal of the operational amplifier AMP is simultaneously connected to one end of the resistor R12 and one end of the resistor R13;
another end of the resistor R13 is simultaneously connected to a drain end of a PMOS power transistor MP and a voltage output port VOUT, and the voltage output port VOUT is arranged to output a working power of the transmitting unit TX of the optical transceiver integrated chip, the voltage output port VOUT is connected to a power supply voltage port TVCC of the transmitting unit TX;
a gate end of the PMOS power transistor MP is connected to an output terminal of the operational amplifier AMP;
a source end of the PMOS power resistor MP and another end of the resistor R5 are connected to a positive terminal of the DC voltage source VDC;
another end of the resistor R12, another end of the resistor R6 and a negative terminal of the DC voltage source VDC are connected to the ground;
said power configuration scheme optimizes said transmitting unit TX at the same time, an optimization scheme to optimize said transmitting unit TX is that: said transmitting unit TX comprises transistors which are all low-voltage high-speed tubes, and said transmitting unit TX comprises a negative capacitance structure composed of capacitors C1 and C2 serving as an auxiliary structure for improving bandwidth;
a minimum voltage of said power supply voltage port TVCC of said transmitting unit TX is 2.7V after optimization.

### Claim 2 (depends on 1)

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference according to claim 1, characterized in that, a working power supply voltage provided by said external power supply configuration unit for said transmitting unit TX of said optical transceiver integrated chip is:
V
OUT
=
VDC
·
R
⁢
6
⁢
(
R
⁢
12
+
R
⁢
13
)
R
⁢
12
⁢
(
R
⁢
5
+
R
⁢
6
)
by adjusting resistance values of said resistor R5, said resistor R6, said resistor R12, and said resistor R13, said output voltage VOUT is changed, and hence said voltage difference between said two DC power supplies is adjusted.

### Claim 3

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference, characterized in that, said power configuration scheme comprises:
a DC voltage source VDC3.3V utilized as a working power supply of a DFB laser;
an internal power configuration unit arranged inside an optical transceiver integrated chip, and a working power supply of a transmitting unit TX of said optical transceiver integrated chip is obtained from said DC voltage source VDC3.3V after being processed by said internal power supply configuration unit;
in order to realize that: said working power supply of said transmitting unit TX of said optical transceiver integrated chip and said working power supply of said DFB laser have a fixed voltage difference;
specifically: a positive terminal of the DC voltage source VDC3.3V is simultaneously connected to a power supply voltage port LVCC of said DFB laser and a power supply voltage port TVCC of said transmitting unit TX of said optical transceiver integrated chip; a negative terminal of said DC voltage source VDC3.3V is grounded; an input terminal of said internal power configuration unit is connected to said power supply voltage port TVCC of said transmitting unit TX, an output terminal of said internal power configuration unit is connected to an internal working power port VCCT of said transmitting unit TX, a voltage differential modulation terminal of said internal power configuration unit is connected to a modulation port CTL of said transmitting unit TX;
said power configuration scheme optimizes said transmitting unit TX at the same time, an optimization scheme to optimize said transmitting unit TX is that: said transmitting unit TX comprises transistors which are all low-voltage high-speed tubes, and said transmitting unit TX comprises a negative capacitance structure composed of capacitors C1 and C2 serving as an auxiliary structure for improving bandwidth;
a minimum voltage of said internal power supply voltage port VCCT of said transmitting unit TX is 2.7V after optimization.

### Claim 4 (depends on 3)

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference according to claim 3, characterized in that, said internal power supply configuration unit comprises a low dropout linear voltage stabilizer, said low dropout linear voltage stabilizer comprises a resistor R5, a resistor R6, a resistor R12, a resistor R13, a PMOS power resistor MP and an operational amplifier AMP;
one end of said resistor R6 is simultaneously connected to one end of said resistor R5 and an inverting input terminal of said operational amplifier AMP;
a non-inverting input terminal of said operational amplifier AMP is simultaneously connected to one end of said resistor R12 and one end of said resistor R13;
another end of said resistor R13 is simultaneously connected to a drain end of said PMOS power transistor MP and an internal working power port VCCT of said transmitting unit TX of said optical transceiver integrated chip;
a gate terminal of said PMOS power transistor MP is connected to an output terminal of said operational amplifier AMP;
a source terminal of said PMOS power transistor MP and another end of said resistor R5 are connected to a power supply voltage port TVCC of said transmitting unit TX;
another end of said resistor R12 and another end of said resistor R6 are connected to the ground;
said power configuration scheme optimizes said transmitting unit TX at the same time, said optimization scheme is that: said transmitting unit TX comprises transistors which are all low-voltage high-speed tubes, and said transmitting unit TX comprises a negative capacitance structure composed of capacitors C1 and C2 serving as an auxiliary structure for improving bandwidth;
a minimum voltage of said power supply voltage port TVCC of said transmitting unit TX is 2.7V after optimization.

### Claim 5 (depends on 4)

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference according to claim 4, characterized in that, said internal power supply configuration unit comprises a programmable module, and said programmable module is arranged to adjust resistance values of said resistor R5, said resistor R6, said resistor R12, said resistor R13 so as to realize an adjustment of said voltage difference between said two working power sources.

### Claim 6 (depends on 5)

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference according to claim 5, characterized in that, said programmable module adopts an analog programmable module or a digital programmable module.

### Claim 7 (depends on 6)

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference according to claim 6, characterized in that, said digital programmable module is realized by a one-time programmable OTP or register programming, and a process of voltage difference adjustment is: first determine a pre-realized voltage difference value between said two working power supplies, then write digital characters as commands through a modulation port CTL of said transmitting unit TX, and said programmable module rewrite a resistance value of said resistor R5, said resistor R6, said resistor R12, and said resistor R13 according to said commands so as to realize said adjustment of voltage difference.

### Claim 8 (depends on 6)

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference according to claim 6, characterized in that, said analog programmable modules is realized by laser trimming or fuse trimming.

### Claim 9 (depends on 3)

The DFB laser DC-coupled output power configuration scheme with adjustable voltage difference according to claim 3, characterized in that, said working power supply voltage provided by said internal power supply configuration unit for said transmitting unit TX of said optical transceiver integrated chip is:
VCCT
=
VDC
·
R
⁢
6
⁢
(
R
⁢
12
+
R
⁢
13
)
R
⁢
12
⁢
(
R
⁢
5
+
R
⁢
6
)
.