WO2018068200A1 - Structure of novel electro-absorption modulated laser (eml) and chirp modulation method - Google Patents

Structure of novel electro-absorption modulated laser (eml) and chirp modulation method Download PDF

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Publication number
WO2018068200A1
WO2018068200A1 PCT/CN2016/101774 CN2016101774W WO2018068200A1 WO 2018068200 A1 WO2018068200 A1 WO 2018068200A1 CN 2016101774 W CN2016101774 W CN 2016101774W WO 2018068200 A1 WO2018068200 A1 WO 2018068200A1
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eam
signal
modulation
modulation signal
eml
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PCT/CN2016/101774
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French (fr)
Chinese (zh)
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陈健
徐之光
李胜平
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华为技术有限公司
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Priority to PCT/CN2016/101774 priority Critical patent/WO2018068200A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission

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  • the present invention relates to the field of optical communications, and in particular to a structure and a chirp modulation method of a novel EML.
  • the distributed feedback laser (DFB) and the feedback laser (FP) broaden the spectral broadening, and the dispersion and enthalpy influences become larger and larger, making it Transmission distance and speed are limited.
  • the ⁇ phenomenon is mainly due to the fact that the phase is also changed at the same time when the signal is intensity-modulated, resulting in broadening of the signal spectrum and limited transmission.
  • reducing the modulation of the light source is one of the keys. If the external modulation method is adopted, the influence of the ⁇ can be greatly reduced, and the transmission distance and the transmission rate can be greatly improved.
  • Electro-absorption Modulated Laser is an integrated device of Electro Absorption Modulator (EAM) and DFB, which is determined by EAM operating with quantum-limited Stark effect (QCSE) and by internal grating coupling.
  • the wavelength-based DFB laser integrates a small-sized, low-wavelength, high-performance optical communication light source, which is a universal ideal light source for information transmission carriers in high-speed optical fiber transmission networks at home and abroad.
  • EML has better transmission characteristics and transmission effects than DFB lasers, especially for high-frequency modulation or long-distance transmission. EML is still flawed.
  • the main causes of ⁇ are the following two reasons: 1.
  • Such defects can be eliminated by means of optical isolators and anti-reflection coatings on the end faces of the modulators; 2. Variations in the refractive index of the modulator medium cause phase modulation of the light.
  • the modulation of the loss of the modulator that is, the imaginary part of the refractive index
  • the intensity of the light wave passing through the EAM changes, and at the same time causes a change in the carrier density
  • Cramer-Koroni The relationship, the real part of the refractive index, also suffers from a certain degree of modulation, which causes a change in the phase of the light wave.
  • the E-band of C-band (wavelength 1530nm-1570nm) is relatively small, it still has flaws. With the transmission rate to 25Gb/s, the impact of EML ⁇ on system performance becomes more and more serious.
  • FIG. 1 An integrated integrated waveguide (IW) is added between the EAM and the DFB to ensure that the DFB is positively biased and there is no photo-generated carrier in the absorptive IW.
  • IW integrated integrated waveguide
  • the modulation bandwidth of the EML is improved and tested by EA-DFB.
  • Figure 2 b is the curve of the factor ⁇ with the reverse bias voltage, and a is the transmission performance of 40 Gb/s NRZ. It can be seen from b that as the reverse bias voltage increases, ⁇ can be as small as -8, which improves the transmission performance of 40Gb/s NRZ.
  • the second example is shown in Figure 3.
  • a semiconductor optical amplifier SOA
  • the dynamic gain compression caused by the consumption of carriers in the SOA is also Along with the phase modulation, the gain-phase coupling factor is negative, and the SOA produces a negative chirp, which compensates for the positive ⁇ of the EAM, which reduces the value of the ⁇ factor ⁇ and reduces the power penalty for long-distance transmission.
  • the third is to perform Efficient Frequency Modulation (FM) and Amplitude Modulation (FM) on the EML. It can adjust the Binder and Kohn's condition of the optical transmission system, suppress the side mode of the spectrum, and modulate the modulation compared to the simple AM modulation.
  • the signal spectral width is narrowed, and the data signal and the reverse data signal are respectively loaded on the EAM and the DFB by phase shifters, which brings favorable pre-turns, provides a negative frequency offset on the rising edge, and improves the transmission distance. .
  • the second method can achieve the negative power and reduce the power cost of the long-distance transmission.
  • SOA works in saturation
  • the signal to EAM The compression is performed, and the noise of the SOA reduces the signal-to-noise ratio (SNR) of the transmitted signal, so that the sensitivity of the received optical signal is low, and the SOA power consumption and the cooling power consumption increase, thereby affecting the light.
  • SNR signal-to-noise ratio
  • the performance of the communication system increases the cost of the optical communication system; the third method requires the EAM to operate at a very high negative bias, and the EML output power is very low, unable to meet the system optical power budget, and requires a phase shifter to adjust the DFB and The delay between the EAM drive signals reduces the effects of transients, and also considers packaging and power consumption issues, increasing the cost of the optical communication system.
  • the invention provides a structure and a ⁇ modulation method of a novel EML, which is used for reducing the insertion loss of the EAM structure by the new EML, so that the new EML satisfies the transmission requirements of the optical communication system and reduces the optical communication system. Cost and power consumption.
  • a first aspect of the present invention provides a novel modulating method for EML applied to a structure of a novel EML, the structure of the novel EML comprising a laser and an electroabsorption modulator EAM structure, the EAM structure including a first EAM portion and a a second EAM part, the first EAM part is connected to the laser, the first EAM part is connected to an optical signal modulation signal, and the second EAM part is connected to a ⁇ modulation signal, and the ⁇ modulation method comprises:
  • the laser receives an input signal and generates an optical signal according to the input signal
  • the first EAM portion receives the optical signal modulation signal, and the second EAM portion receives the chirp modulation signal;
  • the EAM structure obtains a modulation threshold according to the chirp modulation signal, and modulates the optical signal according to the optical signal modulation signal and the modulation threshold.
  • EML is a device for generating optical signals. In order to improve the optical signal transmission effect, it is essential to reduce the influence of dispersion as much as possible, and to reduce the modulation of the optical signal.
  • the EML structure includes the laser and the EAM structure.
  • the EAM structure includes a first EAM part and a second EAM part, the first EAM part is connected to the laser, the first EAM part is connected to the optical signal modulation signal, and the second EAM part is connected to the ⁇ modulation signal, and the laser receives the input signal And generating an optical signal according to the input signal, the first EAM portion receives the optical signal modulation signal, and the second EAM portion receives the ⁇ modulation signal, where the ⁇ modulation signal is preset to compensate for the positive ⁇ generated by the first EAM portion.
  • the value of the factor can reduce the value of the ⁇ factor to a negative value, and the EAM insertion loss when the negative ⁇ is obtained according to the simulation test is obviously compared with the first ⁇ modulation method in the prior art. This reduces the cost and power consumption of the optical communication system by eliminating the need for additional SOA and phase shifters compared to the second and third sigma modulation methods of the prior art.
  • the structure of the novel EML further includes a T-type biaser and an attenuator, and the T-type biaser is connected to the reverse bias voltage and Positively modulating the signal and connecting to the first EAM portion, the attenuator is coupled to the reverse modulated signal and coupled to the second EAM portion,
  • the ⁇ modulation method further includes:
  • the attenuator receives an inverse modulation signal, and performs attenuation processing on the reverse modulation signal to obtain a chirped modulation signal;
  • the T-type biaser receives a reverse bias voltage and a forward modulation signal, and obtains an optical signal modulation signal according to the reverse bias voltage and the forward modulation signal.
  • the optical signal modulation signal received by the first EAM portion and the chirped modulation signal received by the second EAM portion are generated by a T-type bias and an attenuator in the structure of the novel EML, wherein the attenuator receives the inverse modulated signal,
  • the inverse modulated signal is attenuated to obtain a chirped modulated signal, that is, the chirped modulated signal is a small amplitude inverse modulated signal, which only attenuates the amplitude of the signal, and the phase does not change.
  • the T-type biaser is connected to the reverse bias voltage and the forward modulation signal, and a reverse bias voltage is applied to the forward modulation signal to obtain an optical signal modulation signal, and the reverse bias voltage is used to make the first EAM portion. In normal operation, the T-type biaser acts as a protection signal and component.
  • the first EAM part receives the optical signal modulation signal
  • the second EAM part receives the ⁇ modulation signal
  • the first EAM portion receives the optical signal modulation signal sent by the T-type biaser
  • the second EAM portion receives the chirped modulated signal transmitted by the attenuator.
  • the optical signal modulation signal is sent to the first EAM part through a connection with the first EAM part, so that the first EAM part can work normally, and the attenuation Attenuating the inverse modulated signal to obtain a chirped modulated signal, followed by a second EAM
  • the connection between the portions transmits the ⁇ modulation signal to the second EAM portion such that the second EAM portion can compensate for the positive ⁇ caused by the first EAM portion.
  • the EAM structure obtains a modulation threshold according to the ⁇ modulation signal, including:
  • the ⁇ modulation value is obtained based on the length information, the first phase offset value, and the second phase offset value.
  • the ⁇ value of the EML structure is mainly determined by the parameters of the DFB, the first EAM part and the second EAM part, and at the time of production, since the device material and some parameters of the DFB, the first EAM part and the second EAM part are It is known that the length information is necessarily known, and the phase offset values of the first EAM portion and the second EAM portion can be respectively obtained according to the optical signal modulation signal and the ⁇ modulation signal, and the ⁇ modulation value can be obtained by comprehensive calculation.
  • the calculation process of the modulation threshold can be realized that the modulation is negative, and the parameters of the first EAM part and the second EAM part can be flexibly designed according to the required negative ⁇ .
  • the first embodiment of the first aspect, the second embodiment of the first aspect, or the third embodiment of the first aspect, in the fourth embodiment of the first aspect of the present invention is referred to the first aspect of the present invention.
  • the forward modulation signal and the reverse modulation signal hold signals are matched, and the signal is matched to the forward modulation signal and the reverse modulation signal to maintain signal synchronization, delay fixed or phase inversion.
  • the signal matching may be a forward modulation signal and an inverse modulation signal to maintain signal synchronization, delay fixed or phase inversion, etc., forward modulation signal and inverse
  • the modulated signal is generated by the optical communication system, and is generally a pair of forward and reverse differential signals. The matching problem of the two signals can be guaranteed, and the forward modulated signal and the reverse modulated signal are opposite. The reverse is also possible.
  • a second aspect of the present invention provides a structure of a novel EML, comprising:
  • the EAM structure includes a first EAM portion and a second EAM portion, the first EAM portion being connected to the laser;
  • the first EAM portion is connected to an optical signal modulation signal
  • the second EAM portion is connected to a chirp modulation signal
  • EML is a device for generating optical signals.
  • the EML structure includes the laser and the EAM structure.
  • the EAM structure includes a first EAM part and a second EAM part, the first EAM part is connected to the laser, the first EAM part is connected to the optical signal modulation signal, the second EAM part is connected to the ⁇ modulation signal, and the ⁇ modulation signal is pre- It is set to compensate for the positive ⁇ generated by the first EAM part, thereby reducing the ⁇ value.
  • the ⁇ value is reduced to a negative value, and the EAM insertion when the negative ⁇ is obtained according to the simulation test
  • the loss is significantly reduced compared to the first ⁇ modulation method in the prior art, and there is no need to add additional SOA and phase shifters compared to the second and third ⁇ modulation methods in the prior art.
  • the cost and power consumption of the optical communication system are reduced.
  • the structure of the new EML further includes:
  • T-type bias and attenuator
  • the T-type biaser is coupled to the reverse bias voltage and the forward modulation signal and is coupled to the first EAM portion, the attenuator is coupled to the reverse modulation signal and coupled to the second EAM portion ;
  • the T-type biaser is configured to generate the optical signal modulation signal according to the reverse bias voltage value and the forward modulation signal;
  • the attenuator is configured to generate the chirped modulated signal according to the reverse modulated signal.
  • the optical signal modulation signal received by the first EAM portion and the chirped modulation signal received by the second EAM portion are generated by a T-type bias and an attenuator in the structure of the novel EML, wherein the attenuator receives the inverse modulated signal,
  • the inverse modulated signal is attenuated to obtain a chirped modulated signal, that is, the chirped modulated signal is a small amplitude inverse modulated signal, which only attenuates the amplitude of the signal, and the phase does not change.
  • the T-type biaser is connected to the reverse bias voltage and the forward modulation signal, and a reverse bias voltage is applied to the forward modulation signal to obtain an optical signal modulation signal, and the reverse bias voltage is used to make the first EAM portion. In normal In the working state, the T-type biaser acts as a protection signal and component.
  • the first EAM part and the second EAM part are EAMs.
  • the first EAM part and the second EAM part may be separate two-stage EAM, wherein the length and the like of the first EAM part may be inconsistent with the second EAM part, so that the production can be flexible according to requirements.
  • the EAM is selected as the first EAM part and the second EAM part.
  • the EAM structure further includes: an electrical isolation layer;
  • the electrically isolating layer is between the first EAM portion and the second EAM portion.
  • an electrical isolation layer may be added in the middle of the EAM structure, the EAM structure is divided into two segments, the first EAM portion connected to the laser, and the other portion as the second EAM portion, which is advantageous for mass production.
  • the forward modulation signal and the reverse modulation signal hold signals are matched, and the signal is matched to the forward modulation signal and the reverse modulation signal to maintain signal synchronization, delay fixed or phase inversion.
  • the signal matching may be a forward modulation signal and an inverse modulation signal to maintain signal synchronization, delay fixed or phase inversion, etc., forward modulation signal and inverse
  • the modulated signal is generated by the optical communication system, and is generally a pair of forward and reverse differential signals. The matching problem of the two signals can be guaranteed, and the forward modulated signal and the reverse modulated signal are opposite. The reverse is also possible.
  • the laser is a Continuous Wave (CW) laser, which includes DFB and DBR.
  • CW Continuous Wave
  • the laser generally selects a CW laser with a Bragg grating, and the package Including DFB and DBR, which one to choose, no regulation.
  • Figure 1 is a schematic view showing the structure of an EML having an absorptive IW
  • FIG. 2 is a schematic diagram of simulation results of an EML having an absorptive IW
  • FIG. 3 is a schematic structural view of an EML having an SOA
  • FIG. 4 is a schematic structural view of an embodiment of a novel EML according to the present invention.
  • Figure 5 is a schematic diagram of the absorption line of EAM
  • Figure 6 is a schematic view showing the appearance of a novel EML according to the present invention.
  • FIG. 8a and 8b are schematic diagrams showing simulation results of a novel EML according to the present invention.
  • FIG. 9 is a schematic structural view of another embodiment of a novel EML according to the present invention.
  • FIG. 10 is a schematic flow chart of an embodiment of a ⁇ modulation method of a novel EML according to the present invention.
  • FIG. 11 is a flow chart showing another embodiment of a ⁇ modulation method of a novel EML according to the present invention.
  • the invention provides a structure and a ⁇ modulation method of a novel EML, which is used for reducing the insertion loss of the EAM structure by the new EML, so that the new EML satisfies the transmission requirements of the optical communication system and reduces the optical communication system. Cost and power consumption.
  • the novel EML in the present invention is mainly applied to an optical communication system, and may also be used for other lasers. Can be used as a continuous multi-wavelength (frequency) seed source and so on.
  • the following is an example in which the EML structure is applied to a 25Gb/s NRZ 20km SMF transmission system as an example.
  • an embodiment of the present invention provides a structure of a novel EML, including:
  • the EAM structure includes a first EAM portion and a second EAM portion, and the first EAM portion is connected to the laser;
  • the first EAM portion is connected to the optical signal modulation signal, and the second EAM portion is connected to the ⁇ modulation signal.
  • EML is a device for generating optical signals.
  • the appearance of the device of the new EML is shown in Figure 6.
  • the structure of the novel EML includes a laser and an EAM structure.
  • the EAM structure includes a first EAM portion and a second EAM portion.
  • the optical signal is generated according to the input signal, and the first EAM portion is The function is to modulate the optical signal according to the optical signal modulation signal, where the amplitude is substantially modulated, and according to the existing situation, when the optical signal is modulated in the first EAM part, a positive chirp is generated, that is, the chirp factor
  • the value of the second EAM part is connected to the ⁇ modulation signal, and the ⁇ modulation signal is preset to compensate for the positive ⁇ generated by the first EAM part, thereby reducing the value of the ⁇ factor.
  • Figure 5 shows the absorption line diagram of EAM in the prior art, and the three regions A, B and C formed by the range of absorption at different wavelengths, wherein the B region indicates the normality of EAM.
  • the work area produces positive defects; the A and C areas produce negative defects. Therefore, the EAM working in the B area, plus the EAM working in the C area, can achieve ⁇ compensation and even achieve negative ⁇ .
  • the simulation results of the existing EML generating negative enthalpy are shown in Fig. 7a and Fig. 7b.
  • the simulation results of the new EML producing negative enthalpy are shown in Fig. 8a and Fig. 8b.
  • the existing one is compared.
  • the insertion loss of the EML and the insertion loss of the novel EML of the present invention are judged.
  • Fig. 7a when the ⁇ factor ⁇ is -0.5, the reverse bias voltage is -1.4V to -1.5V, and in combination with Fig. 7b, the reverse bias voltage is -1.4V to -1.5V.
  • the insertion loss is about 18dB.
  • the new EML can effectively reduce the insertion loss, so that the EML satisfies the transmission requirements of the optical communication system, and does not require an additional SOA increase compared with the second and third ⁇ modulation methods in the prior art.
  • the phase shifter reduces the cost and power consumption of the optical communication system.
  • the structure of the new EML further includes:
  • T-type bias and attenuator
  • the T-type biaser is connected to the reverse bias voltage and the forward modulation signal, and is connected to the first EAM portion, the attenuator is connected to the reverse modulation signal, and is connected to the second EAM portion;
  • a T-type biaser for generating an optical signal modulation signal according to the reverse bias voltage value and the forward modulation signal
  • An attenuator for generating a chirped modulated signal from the inverse modulated signal.
  • the forward modulation signal and the reverse modulation signal are generally a pair of forward and reverse differential signals, and the forward modulation signal and the reverse modulation signal are both NRZ signals, and the forward modulation signal is used for
  • the amplitude modulation of the optical signal, the first EAM part of the normal working state the need to apply a reverse bias voltage, because the reverse bias voltage is DC voltage, in order to protect the signals and components from DC interference, through the T-type bias
  • the device applies a reverse bias voltage to the forward modulation signal to obtain an optical signal modulation signal; the attenuator attenuates the reverse modulation signal to obtain a chirped modulation signal, that is, the chirped modulation signal is a small amplitude reversal.
  • the modulating signal is only the attenuation of the signal amplitude, and the phase does not change, so that the first EAM part can work in the negative ⁇ region.
  • the T-type bias is actually a way of adding reverse bias voltage and forward modulation signals.
  • a dedicated driver chip such as the HMC7144, can also be used.
  • the forward modulation signal and the reverse modulation signal are sent by the optical communication system, but the case of the self-contained signal generator in the new EML structure is not excluded, and the signal generator can generate a positive direction. Modulation signal and reverse modulation signal.
  • the first EAM part and the second EAM part are EAM.
  • the first EAM part and the second EAM part may be separate two-stage EAM, wherein the length and the like of the first EAM part may be inconsistent with the second EAM part, so that the production is made.
  • EAM can be flexibly selected as the first EAM part and the second EAM part as needed.
  • the EAM structure further includes: an electrical isolation layer;
  • the electrically isolating layer is between the first EAM portion and the second EAM portion.
  • an electrical isolation layer may be added in the middle of the EAM structure, and the EAM structure is divided into two segments, which are connected to the laser as the first EAM portion and the other segment as the second EAM portion. Conducive to mass production.
  • the forward modulation signal and the reverse modulation signal maintain signal matching, and the signal matching is a forward modulation signal and an inverse modulation signal to maintain signal synchronization, delay fixed or phase inversion.
  • the ⁇ -modulated signal obtained after the inverse modulation signal processing only attenuates the amplitude, and the phase does not change. Therefore, before the modulation ⁇ , the reverse modulation signal and the forward direction are The signal matching is already performed between the modulated signals, and the signal matching may be a forward modulation signal and an inverse modulation signal to maintain signal synchronization, fixed delay or phase inversion.
  • the forward modulated signal and the inverse modulated signal are generated by the optical communication system, and are generally a pair of forward and reverse differential signals, and the matching problem of the two signals can be guaranteed.
  • the forward modulation signal and the reverse modulation signal are relative, and it is not necessarily that the forward modulation signal is connected to the first EAM structure, and the ⁇ modulation signal is generated according to the reverse modulation signal, which in turn can of.
  • the laser is a CW laser, and the CW laser includes a DFB and a DBR.
  • the laser generally selects a CW laser with a Bragg grating, and has a DFB and a DBR, which one is specifically selected and is not specified.
  • the above embodiment describes the structure of the novel EML in the present invention.
  • the following is a detailed description of how the enthalpy modulation method of the novel EML is applied to the structure of the novel EML.
  • an embodiment of the present invention provides a ⁇ modulation method for a novel EML, which is applied to the structure of the novel EML shown in FIG. 4.
  • the ⁇ modulation method includes:
  • the laser receives an input signal, and generates an optical signal according to the input signal
  • the laser in the EML structure functions to receive the digitized input signal and convert the input signal into an optical signal, but the converted optical signal also needs to meet the transmission requirement of the optical communication system, otherwise the optical signal Both the transmission distance and the transmission rate are affected.
  • the first EAM part receives the optical signal modulation signal
  • the second EAM part receives the ⁇ modulation signal
  • the first EAM portion of the EAM structure receives the optical signal modulation signal for amplitude modulation of the optical signal, but when the first EAM portion performs amplitude modulation, a positive chirp is generated, in order to solve the first EAM.
  • the effect of the partially generated positive chirp is preset to modulate the modulated signal to the second EAM portion to compensate for the phase of the first EAM portion, and the second EAM portion receives the chirped modulated signal.
  • the EAM structure obtains a modulation threshold according to the ⁇ modulation signal, and modulates the optical signal according to the optical signal modulation signal and the modulation ⁇ value.
  • the value of the ⁇ factor ⁇ when the first EAM part is positive is known, and the ⁇ modulation signal pair received according to the second EAM part is After the positive enthalpy generated by an EAM portion is compensated, the value of the ⁇ factor ⁇ of the overall device of the EML structure is obtained as a modulation ⁇ value, and the optical signal is modulated according to the optical signal modulation signal and the modulation ⁇ value.
  • the simulation result of the existing EML generating negative enthalpy is shown in FIG. 7a and FIG. 7b
  • the simulation result of the negative enthalpy generated by the EML structure of the present invention is as shown in FIG. 8a and FIG. 8b
  • the ⁇ factor ⁇ is selected.
  • the insertion loss of the existing EML and the insertion loss of the EML structure of the present invention are compared to judge the merits and demerits.
  • the reverse bias voltage is -1.4V to -1.5V
  • the reverse bias voltage is -1.4V to -1.5V.
  • the insertion loss is about 18dB.
  • the existing EML produces negative enthalpy and cannot meet the insertion loss requirement of the 25Gb/s NRZ 20km SMF transmission system.
  • ⁇ factor ⁇ is -0.5
  • the insertion loss is about 9dB;
  • the insertion loss is about 8dB, and the insertion loss is reduced by about 10dB compared with the existing EML.
  • the present invention can effectively reduce the insertion loss, so that the EML structure satisfies the transmission requirements of the optical communication system, and does not require an additional SOA increase compared with the second and third ⁇ modulation methods in the prior art. And phase shifters reduce the cost of optical communication systems.
  • the first EAM part works normally, and the second EAM part accesses the ⁇ modulation signal, which is the key to realizing the new EML negative ,, therefore, how the optical signal modulation signal and the ⁇ modulation signal are generated. Need to explain, the following describes how the optical signal modulation signal and the chirp modulation signal are generated by the embodiment,
  • an embodiment of the present invention provides a novel modulating method for EML, which is applied to the structure of a novel EML as shown in FIG. 9.
  • the ⁇ modulation method includes:
  • the laser receives an input signal, and generates an optical signal according to the input signal
  • step 1001 Please refer to step 1001 for details.
  • the attenuator receives the reverse modulated signal, and performs attenuation processing on the reverse modulated signal to obtain a chirped modulated signal.
  • the optical communication system generates a forward modulation signal and an inverse modulation signal that modulate the optical signal in advance, and the forward modulation signal and the reverse modulation signal are NRZ signals.
  • the attenuator receives the inverse modulated signal, and attenuates the reverse modulated signal to obtain a chirped modulated signal, that is, the chirped modulated signal is an inversely modulated signal with a reduced amplitude, only the attenuation of the amplitude of the signal, and the phase does not change.
  • the signal matching is performed between the reverse modulated signal and the forward modulated signal, and the signal matching may be a forward modulated signal and a reverse modulated signal to maintain signal synchronization, fixed delay or phase inversion.
  • the T-type biaser receives the reverse bias voltage and the forward modulation signal, and obtains the optical signal modulation signal according to the reverse bias voltage and the forward modulation signal;
  • the forward modulation signal is used for amplitude modulation of the optical signal.
  • a reverse bias voltage needs to be applied. Since the reverse bias voltage is a DC voltage, in order to protect each signal. And the components are not subject to DC interference, the T-type biaser obtains the reverse bias voltage value and the forward modulation signal, and adds the reverse bias voltage to the forward modulation signal to obtain an optical signal modulation signal.
  • the forward modulation signal and the reverse modulation signal are relative, the two are reversed. It is also possible, for example, that the modulated signal is used to generate an optical signal modulated signal, and the forward modulated signal is used to generate a modulated signal.
  • the first EAM part receives the optical signal modulation signal sent by the T-type biaser, and the second EAM part receives the ⁇ modulation signal sent by the attenuator.
  • the optical signal modulation signal is transmitted to the first EAM portion through the connection with the electrode of the first EAM portion, and the first EAM portion receives the optical signal modulation.
  • the signal after the attenuator attenuates the reverse modulated signal, transmits the obtained ⁇ modulated signal to the second EAM portion through the connection with the electrode of the second EAM portion, and the second EAM portion receives the ⁇ modulated signal.
  • the EAM structure obtains a modulation threshold according to the ⁇ modulation signal, and modulates the optical signal according to the optical signal modulation signal and the modulation ⁇ value.
  • the value of the ⁇ factor ⁇ when the first EAM part is positive is known, and the ⁇ modulation signal pair received according to the second EAM part is After the positive enthalpy generated by an EAM part is compensated, the value of the ⁇ factor ⁇ of the overall device of the new EML is the modulation ⁇ value, and the specific process is:
  • the length information of the first EAM part is L1
  • the length information of the second EAM part is L2.
  • the positive ⁇ generated will cause the optical signal before and after the modulation.
  • the ⁇ modulation signal of the second EAM part is an amplitude modulating inverse modulating signal, and the phase is consistent with the reverse modulating signal, then the second EAM part causes a phase change of the optical signal, which is recorded as the second phase offset value.
  • the total phase offset value of the first EAM part and the second EAM part is The total insertion loss of the first EAM part and the second EAM part is recorded as Negative conditions are generated
  • ⁇ 2 ⁇ 3dB / ln2, where ⁇ 3dB represents half of the value of ⁇ .
  • the generation of the optical signal modulation signal and the ⁇ modulation signal is described, and how the modulation ⁇ value (ie, the overall ⁇ factor ⁇ of the EML structure) is calculated is described in detail.
  • the new EML can be used to arbitrarily modulate the required enthalpy, or even negative enthalpy, by designing the structural parameters of the first EAM portion and the second EAM portion.
  • first EAM part and the second EAM part may be two independent EAMs respectively; or the EAM structure is a piece of EAM, and an electrical isolation layer is formed in the EAM structure to form two EAM parts, wherein the connection The laser is the first EAM part.
  • the laser generally selects a CW laser having a Bragg grating, and has a DFB or a DBR, and which one is specifically selected is not specified.

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Abstract

A structure of an EML and a chirp modulation method, for reducing the insertion loss of an EAM structure while the EML produces negative chirps, such that the EML satisfies the transmission requirements of an optical communication system and reduces the cost and power consumption of the optical communication system. The structure of the EML comprises: a laser and an EAM structure, the EAM structure comprising a first EAM portion and a second EAM portion, the first EAM portion being connected to the laser; the first EAM portion receiving an optical signal modulated signal, the second EAM portion receiving a chirp modulated signal.

Description

一种新型电吸收调制激光器EML的结构及啁啾调制方法Structure and 啁啾 modulation method of a novel electroabsorption modulation laser EML 技术领域Technical field
本发明涉及光通信领域，具体涉及一种新型EML的结构及啁啾调制方法。The present invention relates to the field of optical communications, and in particular to a structure and a chirp modulation method of a novel EML.
背景技术Background technique
为了满足对通信容量日益增长的需求，对10Gb/s甚至25Gb/s的高速光通信系统的研究越来越受到重视。光通信系统速率的提高对光源提出了更高的要求。在目前较为成熟的幅度调制-直接检测的光通信系统中，系统的性能主要In order to meet the increasing demand for communication capacity, research on high-speed optical communication systems of 10Gb/s and even 25Gb/s has received increasing attention. The increase in the speed of the optical communication system puts higher demands on the light source. In the current mature amplitude modulation-direct detection optical communication system, the performance of the system is mainly
受限于光纤色散和光纤非线性所引起的光信号畸变。随着调制速率的提高和传输距离的增加，分布式反馈激光器(Distributed Feedback Laser，DFB)和反馈激光器(Feedback Laser，FP)光谱展宽变大，色散和啁啾影响也越来越大，使得其传输距离和速度均受到限制。啁啾现象主要是由于对信号进行强度调制时，相位也同时发生变化，从而导致信号频谱展宽，传输受到限制。为了尽可能减小色散所带来的影响，减小光源的调制啁啾是关键之一。而如果采用外调制方式，则可以大幅降低其啁啾影响，传输距离和传输速率可以得到大幅提高。Limited by optical signal distortion caused by fiber dispersion and fiber nonlinearity. As the modulation rate increases and the transmission distance increases, the distributed feedback laser (DFB) and the feedback laser (FP) broaden the spectral broadening, and the dispersion and enthalpy influences become larger and larger, making it Transmission distance and speed are limited. The 啁啾 phenomenon is mainly due to the fact that the phase is also changed at the same time when the signal is intensity-modulated, resulting in broadening of the signal spectrum and limited transmission. In order to minimize the effects of dispersion, reducing the modulation of the light source is one of the keys. If the external modulation method is adopted, the influence of the 啁啾 can be greatly reduced, and the transmission distance and the transmission rate can be greatly improved.
电吸收调制激光器(Electro-absorption Modulated Laser，EML)为电吸收调制器(Electro Absorption Modulator，EAM)与DFB的集成器件，是由利用量子限制Stark效应(QCSE)工作的EAM和利用内光栅耦合确定波长的DFB激光器集成的体积小、波长啁啾低的高性能光通信用光源，为当前国内外高速光纤传输网中信息传输载体的通用理想光源。相比直接调制的DFB激光器，EML的传输特性和传输效果要比DFB激光器好，尤其在高频调制或长距离传输时更是如此。EML也还是存在啁啾的，产生啁啾主要是以下两个原因：1、由于调制器外端面的反射导致的半导体激光器波长的漂移，耦合进激光腔外部反射光随强度调制信号而改变，同时也改变了激光振荡波长。此类啁啾可采用光隔离器和在调制器端面上镀防反射膜等措施来消除；2、调制器介质折射率的变化引起对光的相位调制。如果对调制器的损耗进行调制，即折射率的虚部， 通过EAM的光波的强度发生变化，同时引起载流子密度的变化，那么，根据克拉莫-克若尼
Figure PCTCN2016101774-appb-000001
关系，折射率的实部也遭受一定程度的调制，即引起了光波相位的改变。C波段(波长1530nm-1570nm)的EML虽然啁啾比较小，但还是存在啁啾的，随着传输速率到25Gb/s，EML啁啾对系统性能的影响越来越严重，根据仿真可以知道，即使啁啾因子α＝0时，消光比(Extinction Ratio，ER)＝10dB，10dB的消光比对于25Gb/s不归零码(Non-Return to Zero，NRZ)20km单模光纤(Single Mode Fiber，SMF)传输所需要的性能是无法满足的。只有当EML的啁啾因子α为负数时，才能实现25Gb/s NRZ20km SMF的较好传输性能。Electro-absorption Modulated Laser (EML) is an integrated device of Electro Absorption Modulator (EAM) and DFB, which is determined by EAM operating with quantum-limited Stark effect (QCSE) and by internal grating coupling. The wavelength-based DFB laser integrates a small-sized, low-wavelength, high-performance optical communication light source, which is a universal ideal light source for information transmission carriers in high-speed optical fiber transmission networks at home and abroad. Compared to direct-modulated DFB lasers, EML has better transmission characteristics and transmission effects than DFB lasers, especially for high-frequency modulation or long-distance transmission. EML is still flawed. The main causes of 啁啾 are the following two reasons: 1. The drift of the wavelength of the semiconductor laser caused by the reflection of the outer end surface of the modulator, the reflected light coupled into the outside of the laser cavity changes with the intensity modulation signal, and The laser oscillation wavelength is also changed. Such defects can be eliminated by means of optical isolators and anti-reflection coatings on the end faces of the modulators; 2. Variations in the refractive index of the modulator medium cause phase modulation of the light. If the modulation of the loss of the modulator, that is, the imaginary part of the refractive index, the intensity of the light wave passing through the EAM changes, and at the same time causes a change in the carrier density, then according to Cramer-Koroni
Figure PCTCN2016101774-appb-000001
The relationship, the real part of the refractive index, also suffers from a certain degree of modulation, which causes a change in the phase of the light wave. Although the E-band of C-band (wavelength 1530nm-1570nm) is relatively small, it still has flaws. With the transmission rate to 25Gb/s, the impact of EML啁啾 on system performance becomes more and more serious. According to the simulation, Even if the factor α = 0, the extinction ratio (ER) = 10 dB, the extinction ratio of 10 dB for the 25 Gb / s non-return to zero (NRZ) 20 km single mode fiber (Single Mode Fiber, SMF) The performance required for transmission is unsatisfactory. The better transmission performance of the 25Gb/s NRZ20km SMF can be achieved only when the EML factor α is negative.
现有EML的啁啾调制方法有如下三种：The existing EML modulation methods are as follows:
第一种如图1所示，在EAM和DFB之间增加吸收性集成波导(Integrated Waveguide，IW)，保证了工作时，DFB正偏也不会在吸收性IW中有无光生载流子存在，提升了EML的调制带宽，并经过EA-DFB测试，测试结果如图2所示，图2中b为啁啾因子α随反向偏置电压变化曲线，a为40Gb/s NRZ传输性能，从b中可以看出随着反向偏置电压增大，α最小可到-8，提高了40Gb/s NRZ的传输性能。The first one is shown in Figure 1. An integrated integrated waveguide (IW) is added between the EAM and the DFB to ensure that the DFB is positively biased and there is no photo-generated carrier in the absorptive IW. The modulation bandwidth of the EML is improved and tested by EA-DFB. The test result is shown in Figure 2. In Figure 2, b is the curve of the factor α with the reverse bias voltage, and a is the transmission performance of 40 Gb/s NRZ. It can be seen from b that as the reverse bias voltage increases, α can be as small as -8, which improves the transmission performance of 40Gb/s NRZ.
第二种如图3所示，在EAM的另一端连接半导体放大器(Semiconductor Optical Amplifier，SOA)，当SOA工作在饱和状态时，SOA中的载流子的消耗带来的动态增益压缩同时也会伴随着相位调制，所以增益-相位耦合因子是负的，SOA产生负啁啾，补偿了EAM的正啁啾，使得啁啾因子α的数值降低，降低了长距离传输的功率代价。The second example is shown in Figure 3. At the other end of the EAM, a semiconductor optical amplifier (SOA) is connected. When the SOA is operating in saturation, the dynamic gain compression caused by the consumption of carriers in the SOA is also Along with the phase modulation, the gain-phase coupling factor is negative, and the SOA produces a negative chirp, which compensates for the positive 啁啾 of the EAM, which reduces the value of the 啁啾 factor α and reduces the power penalty for long-distance transmission.
第三种为对EML进行混合同步调频调制(Fequency Modulation，FM)和振幅调制(Amplitude Modulation FM)，可以调整光传输系统的Binder and Kohn’s condition，压制光谱的边模，相比单纯AM调制，调制信号光谱宽度被压窄，数据信号和反向数据信号通过移相器(phase shifters)分别加载在EAM和DFB上，带来有利的预啁啾，在上升沿提供负的频偏，提升传输距离。The third is to perform Efficient Frequency Modulation (FM) and Amplitude Modulation (FM) on the EML. It can adjust the Binder and Kohn's condition of the optical transmission system, suppress the side mode of the spectrum, and modulate the modulation compared to the simple AM modulation. The signal spectral width is narrowed, and the data signal and the reverse data signal are respectively loaded on the EAM and the DFB by phase shifters, which brings favorable pre-turns, provides a negative frequency offset on the rising edge, and improves the transmission distance. .
但是，第一种方法中EAM的插损在增大，导致EML的出光功率降低，无法满足传输系统的功率预算要求；第二种方法虽然能实现负啁啾，降低了长距离传输的功率代价，但是由于SOA工作在饱和状态，对EAM的发射信号 进行了压缩，同时SOA的噪声降低了发射信号的信噪比(Signal-Noise Ratio，SNR)，使得接收光信号的灵敏度偏低，并且SOA功耗以及制冷功耗增大，因此，影响了光通信系统的性能且增加了光通信系统的成本；第三种方法需要EAM工作在很高的负偏压，并且EML出光功率很低，无法满足系统光功率预算，同时需要移相器调整DFB和EAM驱动信号之间的延迟(delay)来降低瞬态啁啾的影响，还要考虑封装及功耗的问题，增加了光通信系统的成本。However, in the first method, the insertion loss of the EAM is increased, resulting in a decrease in the output power of the EML, which cannot meet the power budget requirement of the transmission system; the second method can achieve the negative power and reduce the power cost of the long-distance transmission. , but because SOA works in saturation, the signal to EAM The compression is performed, and the noise of the SOA reduces the signal-to-noise ratio (SNR) of the transmitted signal, so that the sensitivity of the received optical signal is low, and the SOA power consumption and the cooling power consumption increase, thereby affecting the light. The performance of the communication system increases the cost of the optical communication system; the third method requires the EAM to operate at a very high negative bias, and the EML output power is very low, unable to meet the system optical power budget, and requires a phase shifter to adjust the DFB and The delay between the EAM drive signals reduces the effects of transients, and also considers packaging and power consumption issues, increasing the cost of the optical communication system.
发明内容Summary of the invention
本发明提供一种新型EML的结构及啁啾调制方法，用于新型EML产生负啁啾的同时减小EAM结构的插损，使得新型EML满足光通信系统的传输要求并且降低了光通信系统的成本及功耗。The invention provides a structure and a 啁啾 modulation method of a novel EML, which is used for reducing the insertion loss of the EAM structure by the new EML, so that the new EML satisfies the transmission requirements of the optical communication system and reduces the optical communication system. Cost and power consumption.
本发明第一方面提供一种新型EML的啁啾调制方法，应用于新型EML的结构，所述新型EML的结构包括激光器和电吸收调制器EAM结构，所述EAM结构包括第一EAM部分及第二EAM部分，所述第一EAM部分与所述激光器连接，所述第一EAM部分接入光信号调制信号，所述第二EAM部分接入啁啾调制信号，所述啁啾调制方法包括：A first aspect of the present invention provides a novel modulating method for EML applied to a structure of a novel EML, the structure of the novel EML comprising a laser and an electroabsorption modulator EAM structure, the EAM structure including a first EAM portion and a a second EAM part, the first EAM part is connected to the laser, the first EAM part is connected to an optical signal modulation signal, and the second EAM part is connected to a 啁啾 modulation signal, and the 啁啾 modulation method comprises:
所述激光器接收输入信号，根据所述输入信号生成光信号；The laser receives an input signal and generates an optical signal according to the input signal;
所述第一EAM部分接收所述光信号调制信号，所述第二EAM部分接收所述啁啾调制信号；The first EAM portion receives the optical signal modulation signal, and the second EAM portion receives the chirp modulation signal;
所述EAM结构根据所述啁啾调制信号得到调制啁啾值，根据所述光信号调制信号和所述调制啁啾值对所述光信号进行调制。The EAM structure obtains a modulation threshold according to the chirp modulation signal, and modulates the optical signal according to the optical signal modulation signal and the modulation threshold.
在光通信系统中，EML是光信号的生成器件，为了提高光信号传输效果，尽可能减小色散所带来的影响，减小光信号的调制啁啾是关键，EML结构包括激光器和EAM结构，EAM结构包括第一EAM部分及第二EAM部分，第一EAM部分与激光器连接，第一EAM部分接入光信号调制信号，第二EAM部分接入啁啾调制信号，激光器接收到输入信号后，根据输入信号生成光信号，第一EAM部分接收到光信号调制信号，第二EAM部分接收啁啾调制信号，啁啾调制信号是预先设置的，用于补偿第一EAM部分产生的正啁啾，从而降低啁啾 因子的数值，根据实践得出，可以将啁啾因子的数值降为负值，并且根据仿真测试得到负啁啾时的EAM插损与现有技术中第一种啁啾调制方式相比，明显降低了，与现有技术中第二种和第三种啁啾调制方式相比，不需要额外的增加SOA和移相器，使得光通信系统的成本和功耗降低。In the optical communication system, EML is a device for generating optical signals. In order to improve the optical signal transmission effect, it is essential to reduce the influence of dispersion as much as possible, and to reduce the modulation of the optical signal. The EML structure includes the laser and the EAM structure. The EAM structure includes a first EAM part and a second EAM part, the first EAM part is connected to the laser, the first EAM part is connected to the optical signal modulation signal, and the second EAM part is connected to the 啁啾 modulation signal, and the laser receives the input signal And generating an optical signal according to the input signal, the first EAM portion receives the optical signal modulation signal, and the second EAM portion receives the 啁啾 modulation signal, where the 啁啾 modulation signal is preset to compensate for the positive 产生 generated by the first EAM portion. , thereby reducing 啁啾 The value of the factor, according to practice, can reduce the value of the 啁啾 factor to a negative value, and the EAM insertion loss when the negative 啁啾 is obtained according to the simulation test is obviously compared with the first 啁啾 modulation method in the prior art. This reduces the cost and power consumption of the optical communication system by eliminating the need for additional SOA and phase shifters compared to the second and third sigma modulation methods of the prior art.
结合本发明第一方面，本发明第一方面第一实施方式中，所述新型EML的结构还包括T型偏置器和衰减器，所述T型偏置器接入反向偏置电压及正向调制信号，并与所述第一EAM部分连接，所述衰减器接入反向调制信号，并与所述第二EAM部分连接，With reference to the first aspect of the present invention, in the first embodiment of the first aspect of the present invention, the structure of the novel EML further includes a T-type biaser and an attenuator, and the T-type biaser is connected to the reverse bias voltage and Positively modulating the signal and connecting to the first EAM portion, the attenuator is coupled to the reverse modulated signal and coupled to the second EAM portion,
所述啁啾调制方法，还包括：The 啁啾 modulation method further includes:
所述衰减器接收反向调制信号，对所述反向调制信号进行衰减处理，得到啁啾调制信号；The attenuator receives an inverse modulation signal, and performs attenuation processing on the reverse modulation signal to obtain a chirped modulation signal;
所述T型偏置器接收反向偏置电压及正向调制信号，根据所述反向偏置电压及所述正向调制信号，得到光信号调制信号。The T-type biaser receives a reverse bias voltage and a forward modulation signal, and obtains an optical signal modulation signal according to the reverse bias voltage and the forward modulation signal.
第一EAM部分接收的光信号调制信号及第二EAM部分接收的啁啾调制信号是由新型EML的结构中的T型偏置器和衰减器生成的，其中衰减器接收反向调制信号，对反向调制信号进行衰减处理，得到啁啾调制信号，即啁啾调制信号是小幅度的反向调制信号，仅仅是对信号幅度进行的衰减，相位不改变。而T型偏置器接入反向偏置电压及正向调制信号，在正向调制信号加上反向偏置电压，得到光信号调制信号，反向偏置电压是为了使第一EAM部分处于正常工作状态，T型偏置器起到了保护信号和元器件的作用。The optical signal modulation signal received by the first EAM portion and the chirped modulation signal received by the second EAM portion are generated by a T-type bias and an attenuator in the structure of the novel EML, wherein the attenuator receives the inverse modulated signal, The inverse modulated signal is attenuated to obtain a chirped modulated signal, that is, the chirped modulated signal is a small amplitude inverse modulated signal, which only attenuates the amplitude of the signal, and the phase does not change. The T-type biaser is connected to the reverse bias voltage and the forward modulation signal, and a reverse bias voltage is applied to the forward modulation signal to obtain an optical signal modulation signal, and the reverse bias voltage is used to make the first EAM portion. In normal operation, the T-type biaser acts as a protection signal and component.
结合本发明第一方面第一实施方式，本发明第一方面第二实施方式中，所述第一EAM部分接收所述光信号调制信号，所述第二EAM部分接收所述啁啾调制信号，包括：With reference to the first embodiment of the first aspect of the present invention, in the second embodiment of the first aspect of the present invention, the first EAM part receives the optical signal modulation signal, and the second EAM part receives the 啁啾 modulation signal, include:
所述第一EAM部分接收所述T型偏置器发送的所述光信号调制信号；The first EAM portion receives the optical signal modulation signal sent by the T-type biaser;
所述第二EAM部分接收所述衰减器发送的所述啁啾调制信号。The second EAM portion receives the chirped modulated signal transmitted by the attenuator.
T型偏置器整合正向调制信号和反向偏置电压后，通过与第一EAM部分之间的连接将光信号调制信号发送至第一EAM部分，使得第一EAM部分能正常工作，衰减器衰减处理反向调制信号得到啁啾调制信号后，通过与第二EAM 部分之间的连接将啁啾调制信号发送至第二EAM部分，使得第二EAM部分可以补偿第一EAM部分带来的正啁啾。After the T-type biaser integrates the forward modulation signal and the reverse bias voltage, the optical signal modulation signal is sent to the first EAM part through a connection with the first EAM part, so that the first EAM part can work normally, and the attenuation Attenuating the inverse modulated signal to obtain a chirped modulated signal, followed by a second EAM The connection between the portions transmits the 啁啾 modulation signal to the second EAM portion such that the second EAM portion can compensate for the positive 带来 caused by the first EAM portion.
结合本发明第一方面第二实施方式，本发明第一方面方面第三实施方式中，所述EAM结构根据所述啁啾调制信号得到调制啁啾值，包括：With reference to the second embodiment of the first aspect of the present invention, in the third embodiment of the first aspect of the present invention, the EAM structure obtains a modulation threshold according to the 啁啾 modulation signal, including:
获取所述第一EAM部分及所述第二EAM部分的长度信息；Obtaining length information of the first EAM part and the second EAM part;
根据所述光信号调制信号得到所述第一EAM部分的第一相位偏移值，根据所述啁啾调制信号得到所述第二EAM部分的第二相位偏移值；Obtaining a first phase offset value of the first EAM portion according to the optical signal modulation signal, and obtaining a second phase offset value of the second EAM portion according to the 啁啾 modulation signal;
根据所述长度信息及所述第一相位偏移值及所述第二相位偏移值，得到啁啾调制值。The 啁啾 modulation value is obtained based on the length information, the first phase offset value, and the second phase offset value.
EML结构的啁啾值主要是由DFB、第一EAM部分和第二EAM部分的参数决定的，而在生产时，由于DFB、第一EAM部分和第二EAM部分的器件材料和部分参数都是已知的，长度信息必然知道，而根据光信号调制信号和啁啾调制信号就可以分别得到第一EAM部分和第二EAM部分的相位偏移值，综合计算就能得到啁啾调制值，从调制啁啾值的计算过程可知，调制为负啁啾可以实现，也可根据所需的负啁啾，灵活的设计第一EAM部分和第二EAM部分的参数。The 啁啾 value of the EML structure is mainly determined by the parameters of the DFB, the first EAM part and the second EAM part, and at the time of production, since the device material and some parameters of the DFB, the first EAM part and the second EAM part are It is known that the length information is necessarily known, and the phase offset values of the first EAM portion and the second EAM portion can be respectively obtained according to the optical signal modulation signal and the 啁啾 modulation signal, and the 啁啾 modulation value can be obtained by comprehensive calculation. The calculation process of the modulation threshold can be realized that the modulation is negative, and the parameters of the first EAM part and the second EAM part can be flexibly designed according to the required negative 啁啾.
结合本发明第一方面、第一方面第一实施方式、第一方面第二实施方式或第一方面第三实施方式，本发明第一方面第四实施方式中，With reference to the first aspect of the present invention, the first embodiment of the first aspect, the second embodiment of the first aspect, or the third embodiment of the first aspect, in the fourth embodiment of the first aspect of the present invention,
所述正向调制信号及所述反向调制信号保持信号匹配，所述信号匹配为所述正向调制信号及所述反向调制信号保持信号同步、时延固定或相位反相。The forward modulation signal and the reverse modulation signal hold signals are matched, and the signal is matched to the forward modulation signal and the reverse modulation signal to maintain signal synchronization, delay fixed or phase inversion.
在信号生成器生成正向调制信号和反向调制信号时，考虑到需要调制为负啁啾的情况，需要将反向调制信号和正向调制信号做时间和相位方面的信号匹配，并且生成之后，经过T型偏置器和衰减器之后是不会改变信号匹配条件的，信号匹配可以是正向调制信号及反向调制信号保持信号同步、时延固定或相位反相等，正向调制信号和反向调制信号是由光通信系统生成的，而且一般都为一对正向和反向的差分信号，两者信号的匹配问题可以保证，并且正向调制信号和反向调制信号是相对的，两者反过来也是可以的。When the signal generator generates the forward modulation signal and the reverse modulation signal, in consideration of the case where the modulation is required to be negative, it is necessary to match the reverse modulation signal and the forward modulation signal in time and phase, and after generation, After the T-type biaser and the attenuator, the signal matching condition is not changed. The signal matching may be a forward modulation signal and an inverse modulation signal to maintain signal synchronization, delay fixed or phase inversion, etc., forward modulation signal and inverse The modulated signal is generated by the optical communication system, and is generally a pair of forward and reverse differential signals. The matching problem of the two signals can be guaranteed, and the forward modulated signal and the reverse modulated signal are opposite. The reverse is also possible.
本发明第二方面提供一种新型EML的结构，包括： A second aspect of the present invention provides a structure of a novel EML, comprising:
激光器和EAM结构；Laser and EAM structure;
所述EAM结构包括第一EAM部分及第二EAM部分，所述第一EAM部分与所述激光器连接；The EAM structure includes a first EAM portion and a second EAM portion, the first EAM portion being connected to the laser;
所述第一EAM部分接入光信号调制信号，所述第二EAM部分接入啁啾调制信号。The first EAM portion is connected to an optical signal modulation signal, and the second EAM portion is connected to a chirp modulation signal.
在光通信系统中，EML是光信号的生成器件，为了提高光信号传输效果，尽可能减小色散所带来的影响，减小光信号的调制啁啾是关键，EML结构包括激光器和EAM结构，EAM结构包括第一EAM部分及第二EAM部分，第一EAM部分与激光器连接，第一EAM部分接入光信号调制信号，第二EAM部分接入啁啾调制信号，啁啾调制信号是预先设置的，用于补偿第一EAM部分产生的正啁啾，从而降低啁啾值，根据实践得出，可以实现将啁啾值降为负值，并且根据仿真测试得到负啁啾时的EAM插损与现有技术中第一种啁啾调制方式相比，明显降低了，与现有技术中第二种和第三种啁啾调制方式相比，不需要额外的增加SOA和移相器，使得光通信系统的成本和功耗降低。In the optical communication system, EML is a device for generating optical signals. In order to improve the optical signal transmission effect, it is essential to reduce the influence of dispersion as much as possible, and to reduce the modulation of the optical signal. The EML structure includes the laser and the EAM structure. The EAM structure includes a first EAM part and a second EAM part, the first EAM part is connected to the laser, the first EAM part is connected to the optical signal modulation signal, the second EAM part is connected to the 啁啾 modulation signal, and the 啁啾 modulation signal is pre- It is set to compensate for the positive 产生 generated by the first EAM part, thereby reducing the 啁啾 value. According to practice, it can be realized that the 啁啾 value is reduced to a negative value, and the EAM insertion when the negative 啁啾 is obtained according to the simulation test The loss is significantly reduced compared to the first 啁啾 modulation method in the prior art, and there is no need to add additional SOA and phase shifters compared to the second and third 啁啾 modulation methods in the prior art. The cost and power consumption of the optical communication system are reduced.
结合本发明第二方面，本发明第二方面第一实施方式中，所述新型EML的结构还包括：With reference to the second aspect of the present invention, in the first embodiment of the second aspect of the present invention, the structure of the new EML further includes:
T型偏置器和衰减器；T-type bias and attenuator;
所述T型偏置器接入反向偏置电压及正向调制信号，并与所述第一EAM部分连接，所述衰减器接入反向调制信号，并与所述第二EAM部分连接；The T-type biaser is coupled to the reverse bias voltage and the forward modulation signal and is coupled to the first EAM portion, the attenuator is coupled to the reverse modulation signal and coupled to the second EAM portion ;
所述T型偏置器，用于根据反向偏置电压值及所述正向调制信号生成所述光信号调制信号；The T-type biaser is configured to generate the optical signal modulation signal according to the reverse bias voltage value and the forward modulation signal;
所述衰减器，用于根据所述反向调制信号生成所述啁啾调制信号。The attenuator is configured to generate the chirped modulated signal according to the reverse modulated signal.
第一EAM部分接收的光信号调制信号及第二EAM部分接收的啁啾调制信号是由新型EML的结构中的T型偏置器和衰减器生成的，其中衰减器接收反向调制信号，对反向调制信号进行衰减处理，得到啁啾调制信号，即啁啾调制信号是小幅度的反向调制信号，仅仅是对信号幅度进行的衰减，相位不改变。而T型偏置器接入反向偏置电压及正向调制信号，在正向调制信号加上反向偏置电压，得到光信号调制信号，反向偏置电压是为了使第一EAM部分处于正常 工作状态，T型偏置器起到了保护信号和元器件的作用。The optical signal modulation signal received by the first EAM portion and the chirped modulation signal received by the second EAM portion are generated by a T-type bias and an attenuator in the structure of the novel EML, wherein the attenuator receives the inverse modulated signal, The inverse modulated signal is attenuated to obtain a chirped modulated signal, that is, the chirped modulated signal is a small amplitude inverse modulated signal, which only attenuates the amplitude of the signal, and the phase does not change. The T-type biaser is connected to the reverse bias voltage and the forward modulation signal, and a reverse bias voltage is applied to the forward modulation signal to obtain an optical signal modulation signal, and the reverse bias voltage is used to make the first EAM portion. In normal In the working state, the T-type biaser acts as a protection signal and component.
结合本发明第二方面第一实施方式，本发明第二方面第二实施方式中，With reference to the first embodiment of the second aspect of the present invention, in the second embodiment of the second aspect of the present invention,
所述第一EAM部分及所述第二EAM部分为EAM。The first EAM part and the second EAM part are EAMs.
在生产EAM结构时，第一EAM部分和第二EAM部分可以是单独的两段EAM，其中第一EAM部分的长度等参数与第二EAM部分可以不一致，这样使得生产的时候，可以根据需要灵活的选择EAM作为第一EAM部分和第二EAM部分。When the EAM structure is produced, the first EAM part and the second EAM part may be separate two-stage EAM, wherein the length and the like of the first EAM part may be inconsistent with the second EAM part, so that the production can be flexible according to requirements. The EAM is selected as the first EAM part and the second EAM part.
结合本发明第二方面第一实施方式，本发明第二方面第三实施方式中，所述EAM结构还包括：电隔离层；With reference to the first embodiment of the second aspect of the present invention, in the third embodiment of the second aspect of the present invention, the EAM structure further includes: an electrical isolation layer;
所述电隔离层处于所述第一EAM部分和所述第二EAM部分之间。The electrically isolating layer is between the first EAM portion and the second EAM portion.
在生产EAM结构时，可以在EAM结构的中间增加电隔离层，将EAM结构划分为两段，与激光器连接的作为第一EAM部分，另一段作为第二EAM部分，有利于批量生产。In the production of the EAM structure, an electrical isolation layer may be added in the middle of the EAM structure, the EAM structure is divided into two segments, the first EAM portion connected to the laser, and the other portion as the second EAM portion, which is advantageous for mass production.
结合本发明第二方面、第二方面第一实施方式、第二方面第二实施方式或第二方面第三实施方式，本发明第二方面第四实施方式中，With reference to the second aspect of the present invention, the first embodiment of the second aspect, the second embodiment of the second aspect, or the third embodiment of the second aspect, in the fourth embodiment of the second aspect of the present invention,
所述正向调制信号及所述反向调制信号保持信号匹配，所述信号匹配为所述正向调制信号及所述反向调制信号保持信号同步、时延固定或相位反相。The forward modulation signal and the reverse modulation signal hold signals are matched, and the signal is matched to the forward modulation signal and the reverse modulation signal to maintain signal synchronization, delay fixed or phase inversion.
在信号生成器生成正向调制信号和反向调制信号时，考虑到需要调制为负啁啾的情况，需要将反向调制信号和正向调制信号做时间和相位方面的信号匹配，并且生成之后，经过T型偏置器和衰减器之后是不会改变信号匹配条件的，信号匹配可以是正向调制信号及反向调制信号保持信号同步、时延固定或相位反相等，正向调制信号和反向调制信号是由光通信系统生成的，而且一般都为一对正向和反向的差分信号，两者信号的匹配问题可以保证，并且正向调制信号和反向调制信号是相对的，两者反过来也是可以的。When the signal generator generates the forward modulation signal and the reverse modulation signal, in consideration of the case where the modulation is required to be negative, it is necessary to match the reverse modulation signal and the forward modulation signal in time and phase, and after generation, After the T-type biaser and the attenuator, the signal matching condition is not changed. The signal matching may be a forward modulation signal and an inverse modulation signal to maintain signal synchronization, delay fixed or phase inversion, etc., forward modulation signal and inverse The modulated signal is generated by the optical communication system, and is generally a pair of forward and reverse differential signals. The matching problem of the two signals can be guaranteed, and the forward modulated signal and the reverse modulated signal are opposite. The reverse is also possible.
结合本发明第二方面第四实施方式，本发明第二方面第五实施方式中，With reference to the fourth embodiment of the second aspect of the present invention, in the fifth embodiment of the second aspect of the present invention,
所述激光器为连续式(Continuous Wave，CW)激光器，所述CW激光器包括DFB和DBR。The laser is a Continuous Wave (CW) laser, which includes DFB and DBR.
在现有的EML结构中，激光器一般选择具有布拉格光栅的CW激光器，包 括DFB和DBR，具体选择哪种，不做规定。In the existing EML structure, the laser generally selects a CW laser with a Bragg grating, and the package Including DFB and DBR, which one to choose, no regulation.
附图说明DRAWINGS
为了更清楚地说明本发明实施例技术方案，下面将对实施例和现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments and the prior art description will be briefly described below. Obviously, the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those skilled in the art without any inventive effort.
图1为具有吸收性IW的EML的结构示意图；Figure 1 is a schematic view showing the structure of an EML having an absorptive IW;
图2为具有吸收性IW的EML的仿真结果的示意图；2 is a schematic diagram of simulation results of an EML having an absorptive IW;
图3为具有SOA的EML的结构示意图；3 is a schematic structural view of an EML having an SOA;
图4为本发明中新型EML的一个实施例结构示意图；4 is a schematic structural view of an embodiment of a novel EML according to the present invention;
图5为EAM的吸收谱线示意图；Figure 5 is a schematic diagram of the absorption line of EAM;
图6为本发明中新型EML的外观结构示意图；Figure 6 is a schematic view showing the appearance of a novel EML according to the present invention;
图7a和图7b为现有的EML仿真结果示意图；7a and 7b are schematic diagrams of existing EML simulation results;
图8a和图8b为本发明中新型EML的仿真结果示意图；8a and 8b are schematic diagrams showing simulation results of a novel EML according to the present invention;
图9为本发明中新型EML的另一个实施例结构示意图；9 is a schematic structural view of another embodiment of a novel EML according to the present invention;
图10为本发明中新型EML的啁啾调制方法的一个实施例流程示意图；10 is a schematic flow chart of an embodiment of a 啁啾 modulation method of a novel EML according to the present invention;
图11为本发明中新型EML的啁啾调制方法的另一个实施例流程示意图。11 is a flow chart showing another embodiment of a 啁啾 modulation method of a novel EML according to the present invention.
具体实施方式detailed description
本发明提供一种新型EML的结构及啁啾调制方法，用于新型EML产生负啁啾的同时减小EAM结构的插损，使得新型EML满足光通信系统的传输要求并且降低了光通信系统的成本和功耗。The invention provides a structure and a 啁啾 modulation method of a novel EML, which is used for reducing the insertion loss of the EAM structure by the new EML, so that the new EML satisfies the transmission requirements of the optical communication system and reduces the optical communication system. Cost and power consumption.
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is an embodiment of the invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.
本发明中新型EML主要应用于光通信系统，也可能用于其他激光器，也可 能用于当作连续多波长(频率)种子光源等等。下面以EML结构应用于25Gb/s NRZ 20km SMF传输系统为例进行详细说明。The novel EML in the present invention is mainly applied to an optical communication system, and may also be used for other lasers. Can be used as a continuous multi-wavelength (frequency) seed source and so on. The following is an example in which the EML structure is applied to a 25Gb/s NRZ 20km SMF transmission system as an example.
请参阅图4，本发明实施例提供一种新型EML的结构，包括：Referring to FIG. 4, an embodiment of the present invention provides a structure of a novel EML, including:
激光器和EAM结构；Laser and EAM structure;
EAM结构包括第一EAM部分及第二EAM部分，第一EAM部分与激光器连接；The EAM structure includes a first EAM portion and a second EAM portion, and the first EAM portion is connected to the laser;
第一EAM部分接入光信号调制信号，第二EAM部分接入啁啾调制信号。The first EAM portion is connected to the optical signal modulation signal, and the second EAM portion is connected to the 啁啾 modulation signal.
在光通信系统中EML是光信号的生成器件，新型EML的器件外观如图6所示，为了提高光信号传输效果，尽可能减小色散所带来的影响，减小光源的调制啁啾是关键，新型EML的结构包括激光器和EAM结构，EAM结构包括第一EAM部分及第二EAM部分，在激光器接收到需要转化为光信号的输入信号后，根据输入信号生成光信号，第一EAM部分起到的作用是根据光信号调制信号对光信号进行调制，这里实质上是幅度的调制，根据现有的情况在第一EAM部分进行光信号调制的时候会产生正啁啾，即啁啾因子的数值为正数，第二EAM部分接入啁啾调制信号，啁啾调制信号是预先设置的，用于补偿第一EAM部分产生的正啁啾，从而降低啁啾因子的数值。In the optical communication system, EML is a device for generating optical signals. The appearance of the device of the new EML is shown in Figure 6. In order to improve the optical signal transmission effect, the influence of dispersion is minimized, and the modulation of the light source is reduced. Critically, the structure of the novel EML includes a laser and an EAM structure. The EAM structure includes a first EAM portion and a second EAM portion. After the laser receives an input signal that needs to be converted into an optical signal, the optical signal is generated according to the input signal, and the first EAM portion is The function is to modulate the optical signal according to the optical signal modulation signal, where the amplitude is substantially modulated, and according to the existing situation, when the optical signal is modulated in the first EAM part, a positive chirp is generated, that is, the chirp factor The value of the second EAM part is connected to the 啁啾 modulation signal, and the 啁啾 modulation signal is preset to compensate for the positive 产生 generated by the first EAM part, thereby reducing the value of the 啁啾 factor.
啁啾补偿原理为：如图5所示为现有技术中EAM的吸收谱线图，在不同波长下的吸收率的范围形成的A、B和C三个区域，其中B区域表示EAM的正常工作区域，产生正啁啾；而A区域和C区域产生负啁啾。因此，工作在B区域的EAM，再加一段工作在C区域的EAM，即可实现啁啾补偿，甚至实现负啁啾。The principle of 啁啾 compensation is as follows: Figure 5 shows the absorption line diagram of EAM in the prior art, and the three regions A, B and C formed by the range of absorption at different wavelengths, wherein the B region indicates the normality of EAM. The work area produces positive defects; the A and C areas produce negative defects. Therefore, the EAM working in the B area, plus the EAM working in the C area, can achieve 啁啾 compensation and even achieve negative 啁啾.
现有EML产生负啁啾的仿真结果如图7a和图7b所示，新型EML产生负啁啾的仿真结果如图8a和图8b所示，选择啁啾因子α为-0.5时，比较现有EML的插损和本发明新型EML的插损，来判断优劣。从图7a可以看出，当啁啾因子α为-0.5时，反向偏置电压为-1.4V～-1.5V，又结合图7b，反向偏置电压为-1.4V～-1.5V时，插损约为18dB，现有EML产生负啁啾的同时无法满足25Gb/s NRZ 20km SMF传输系统的插损要求；从图8a可以看到，在啁啾因子α为-0.5时，有两种情况，一种是ER＝10dB，Uon＝0.4V，Um＝1.6Vpp，并且设置的第二EAM部分的长度L2＝100um，结合图8b，得知插损约为9dB；一种是ER＝8dB， Uon＝0.4V，Um＝1.6Vpp，结合图8b，得知插损约为8dB，与现有EML相比，插损降低了约10dB。The simulation results of the existing EML generating negative enthalpy are shown in Fig. 7a and Fig. 7b. The simulation results of the new EML producing negative enthalpy are shown in Fig. 8a and Fig. 8b. When the 啁啾 factor α is selected as -0.5, the existing one is compared. The insertion loss of the EML and the insertion loss of the novel EML of the present invention are judged. As can be seen from Fig. 7a, when the 啁啾 factor α is -0.5, the reverse bias voltage is -1.4V to -1.5V, and in combination with Fig. 7b, the reverse bias voltage is -1.4V to -1.5V. The insertion loss is about 18dB. The existing EML produces negative enthalpy and cannot meet the insertion loss requirement of the 25Gb/s NRZ 20km SMF transmission system. As can be seen from Figure 8a, when the 啁啾 factor α is -0.5, there are two In one case, one is ER=10dB, U on =0.4V, U m =1.6V pp , and the length of the second EAM portion is set to L2=100um, and in combination with FIG. 8b, the insertion loss is about 9dB; It is ER=8dB, U on =0.4V, U m =1.6V pp , and as shown in Fig. 8b, the insertion loss is about 8dB, and the insertion loss is reduced by about 10dB compared with the existing EML.
由此可知，新型EML可以有效的降低插损，使得EML满足光通信系统的传输要求，并且与现有技术中第二种和第三种啁啾调制方式相比，不需要额外的增加SOA和移相器，降低了光通信系统的成本和功耗。It can be seen that the new EML can effectively reduce the insertion loss, so that the EML satisfies the transmission requirements of the optical communication system, and does not require an additional SOA increase compared with the second and third 啁啾 modulation methods in the prior art. The phase shifter reduces the cost and power consumption of the optical communication system.
可选的，如图9所示，本发明的一些实施例中，新型EML的结构还包括：Optionally, as shown in FIG. 9, in some embodiments of the present invention, the structure of the new EML further includes:
T型偏置器和衰减器；T-type bias and attenuator;
T型偏置器接入反向偏置电压及正向调制信号，并与第一EAM部分连接，衰减器接入反向调制信号，并与第二EAM部分连接；The T-type biaser is connected to the reverse bias voltage and the forward modulation signal, and is connected to the first EAM portion, the attenuator is connected to the reverse modulation signal, and is connected to the second EAM portion;
T型偏置器，用于根据反向偏置电压值及正向调制信号生成光信号调制信号；a T-type biaser for generating an optical signal modulation signal according to the reverse bias voltage value and the forward modulation signal;
衰减器，用于根据反向调制信号生成啁啾调制信号。An attenuator for generating a chirped modulated signal from the inverse modulated signal.
本发明实施例中，正向调制信号和反向调制信号一般都为一对正向和反向的差分信号，正向调制信号和反向调制信号均为NRZ信号，正向调制信号是用于对光信号进行幅度调制，第一EAM部分正常工作状态时，需要施加反向偏置电压，由于反向偏置电压为直流电压，为了保护各信号及元器件不受直流干扰，通过T型偏置器将反向偏置电压加到正向调制信号中，得到光信号调制信号；衰减器对反向调制信号进行衰减处理，得到啁啾调制信号，即啁啾调制信号是小幅度的反向调制信号，仅仅是对信号幅度进行的衰减，相位不改变，可以使得第一EAM部分工作在负啁啾区域。In the embodiment of the present invention, the forward modulation signal and the reverse modulation signal are generally a pair of forward and reverse differential signals, and the forward modulation signal and the reverse modulation signal are both NRZ signals, and the forward modulation signal is used for The amplitude modulation of the optical signal, the first EAM part of the normal working state, the need to apply a reverse bias voltage, because the reverse bias voltage is DC voltage, in order to protect the signals and components from DC interference, through the T-type bias The device applies a reverse bias voltage to the forward modulation signal to obtain an optical signal modulation signal; the attenuator attenuates the reverse modulation signal to obtain a chirped modulation signal, that is, the chirped modulation signal is a small amplitude reversal. The modulating signal is only the attenuation of the signal amplitude, and the phase does not change, so that the first EAM part can work in the negative 啁啾 region.
需要说明的是，T型偏置器实际上是一种加反向偏置电压和正向调制信号的方式，在新型EML的结构中也可以使用专用的驱动芯片，例如HMC7144，也可以实现这一功能。It should be noted that the T-type bias is actually a way of adding reverse bias voltage and forward modulation signals. In the structure of the new EML, a dedicated driver chip, such as the HMC7144, can also be used. Features.
需要说明的是，一般情况下，正向调制信号和反向调制信号是由光通信系统发出的，但是，并不排除新型EML结构中自带信号生成器的情况，信号生成器可以生成正向调制信号和反向调制信号。It should be noted that, in general, the forward modulation signal and the reverse modulation signal are sent by the optical communication system, but the case of the self-contained signal generator in the new EML structure is not excluded, and the signal generator can generate a positive direction. Modulation signal and reverse modulation signal.
可选的，本发明的一些实施例中，Optionally, in some embodiments of the present invention,
第一EAM部分及第二EAM部分为EAM。 The first EAM part and the second EAM part are EAM.
本发明实施例中，在生产EAM结构时，第一EAM部分和第二EAM部分可以是单独的两段EAM，其中第一EAM部分的长度等参数与第二EAM部分可以不一致，这样使得生产的时候，可以根据需要灵活的选择EAM作为第一EAM部分和第二EAM部分。In the embodiment of the present invention, when the EAM structure is produced, the first EAM part and the second EAM part may be separate two-stage EAM, wherein the length and the like of the first EAM part may be inconsistent with the second EAM part, so that the production is made. At that time, EAM can be flexibly selected as the first EAM part and the second EAM part as needed.
可选的，本发明的一些实施例中，EAM结构还包括：电隔离层；Optionally, in some embodiments of the present invention, the EAM structure further includes: an electrical isolation layer;
电隔离层处于第一EAM部分和第二EAM部分之间。The electrically isolating layer is between the first EAM portion and the second EAM portion.
本发明实施例中，在生产EAM结构时，可以在EAM结构的中间增加电隔离层，将EAM结构划分为两段，与激光器连接的作为第一EAM部分，另一段作为第二EAM部分，有利于批量生产。In the embodiment of the present invention, when the EAM structure is produced, an electrical isolation layer may be added in the middle of the EAM structure, and the EAM structure is divided into two segments, which are connected to the laser as the first EAM portion and the other segment as the second EAM portion. Conducive to mass production.
可选的，本发明的一些实施例中，Optionally, in some embodiments of the present invention,
正向调制信号及反向调制信号保持信号匹配，信号匹配为正向调制信号及反向调制信号保持信号同步、时延固定或相位反相。The forward modulation signal and the reverse modulation signal maintain signal matching, and the signal matching is a forward modulation signal and an inverse modulation signal to maintain signal synchronization, delay fixed or phase inversion.
从上述实施例中分析可以得知，反向调制信号处理后得到的啁啾调制信号，只是对幅度的衰减，而相位并不会改变，因此，在调制啁啾之前，反向调制信号和正向调制信号之间是已经做好了信号匹配的，信号匹配可以是正向调制信号及反向调制信号保持信号同步、时延固定或相位反相等。正向调制信号和反向调制信号是由光通信系统生成的，而且一般都为一对正向和反向的差分信号，两者信号的匹配问题可以保证。It can be known from the analysis in the above embodiment that the 啁啾-modulated signal obtained after the inverse modulation signal processing only attenuates the amplitude, and the phase does not change. Therefore, before the modulation 啁啾, the reverse modulation signal and the forward direction are The signal matching is already performed between the modulated signals, and the signal matching may be a forward modulation signal and an inverse modulation signal to maintain signal synchronization, fixed delay or phase inversion. The forward modulated signal and the inverse modulated signal are generated by the optical communication system, and are generally a pair of forward and reverse differential signals, and the matching problem of the two signals can be guaranteed.
需要说明的是，正向调制信号和反向调制信号是相对的，并不一定是正向调制信号接入第一EAM结构，而根据反向调制信号生成啁啾调制信号，两者反过来也是可以的。It should be noted that the forward modulation signal and the reverse modulation signal are relative, and it is not necessarily that the forward modulation signal is connected to the first EAM structure, and the 啁啾 modulation signal is generated according to the reverse modulation signal, which in turn can of.
可选的，本发明的一些实施例中，Optionally, in some embodiments of the present invention,
激光器为CW激光器，CW激光器包括DFB和DBR。The laser is a CW laser, and the CW laser includes a DFB and a DBR.
在现有的EML中，激光器一般选择具有布拉格光栅的CW激光器，有DFB及DBR，具体选择哪种，不做规定。In the existing EML, the laser generally selects a CW laser with a Bragg grating, and has a DFB and a DBR, which one is specifically selected and is not specified.
上述实施例对本发明中新型EML的结构进行了说明，下面通过实施例对新型EML的啁啾调制方法是如何应用于新型EML的结构的进行详细说明。 The above embodiment describes the structure of the novel EML in the present invention. The following is a detailed description of how the enthalpy modulation method of the novel EML is applied to the structure of the novel EML.
请参阅图10，本发明实施例提供一种新型EML的啁啾调制方法，应用于图4所示的新型EML的结构，啁啾调制方法包括：Referring to FIG. 10, an embodiment of the present invention provides a 啁啾 modulation method for a novel EML, which is applied to the structure of the novel EML shown in FIG. 4. The 啁啾 modulation method includes:
1001、激光器接收输入信号，根据输入信号生成光信号；1001, the laser receives an input signal, and generates an optical signal according to the input signal;
本实施例中，EML结构中的激光器起到的作用是接收数字化的输入信号，并将输入信号转化为光信号，但是转化得到的光信号，还需要满足光通信系统的传输要求，不然光信号的传输距离和传输速率都会受到影响。In this embodiment, the laser in the EML structure functions to receive the digitized input signal and convert the input signal into an optical signal, but the converted optical signal also needs to meet the transmission requirement of the optical communication system, otherwise the optical signal Both the transmission distance and the transmission rate are affected.
1002、第一EAM部分接收光信号调制信号，第二EAM部分接收啁啾调制信号；1002. The first EAM part receives the optical signal modulation signal, and the second EAM part receives the 啁啾 modulation signal.
本实施例中，EAM结构的第一EAM部分接收光信号调制信号，用于对光信号进行幅度的调制，但是在第一EAM部分进行幅度调制时，会产生正啁啾，为了解决第一EAM部分产生的正啁啾带来的影响，预设啁啾调制信号至第二EAM部分来补偿第一EAM部分正啁啾时的相位，第二EAM部分接收啁啾调制信号。In this embodiment, the first EAM portion of the EAM structure receives the optical signal modulation signal for amplitude modulation of the optical signal, but when the first EAM portion performs amplitude modulation, a positive chirp is generated, in order to solve the first EAM. The effect of the partially generated positive chirp is preset to modulate the modulated signal to the second EAM portion to compensate for the phase of the first EAM portion, and the second EAM portion receives the chirped modulated signal.
1003、EAM结构根据啁啾调制信号得到调制啁啾值，根据光信号调制信号和调制啁啾值对光信号进行调制。1003. The EAM structure obtains a modulation threshold according to the 啁啾 modulation signal, and modulates the optical signal according to the optical signal modulation signal and the modulation 啁啾 value.
本实施例中，由于第一EAM部分是处于正常工作状态的，那么已知第一EAM部分正啁啾时的啁啾因子α的数值，而根据第二EAM部分接收的啁啾调制信号对第一EAM部分产生的正啁啾进行补偿后，得到该EML结构的整体器件的啁啾因子α的数值为调制啁啾值，根据光信号调制信号和调制啁啾值对光信号进行调制。In this embodiment, since the first EAM part is in a normal working state, the value of the 啁啾 factor α when the first EAM part is positive is known, and the 啁啾 modulation signal pair received according to the second EAM part is After the positive enthalpy generated by an EAM portion is compensated, the value of the 啁啾 factor α of the overall device of the EML structure is obtained as a modulation 啁啾 value, and the optical signal is modulated according to the optical signal modulation signal and the modulation 啁啾 value.
本发明实施例中，现有EML产生负啁啾的仿真结果如图7a和图7b所示，本发明EML结构产生负啁啾的仿真结果如图8a和图8b所示，选择啁啾因子α为-0.5时，比较现有EML的插损和本发明EML结构的插损，来判断优劣。从图7a可以看出，当啁啾因子α为-0.5时，反向偏置电压为-1.4V～-1.5V，又结合图7b，反向偏置电压为-1.4V～-1.5V时，插损约为18dB，现有EML产生负啁啾的同时无法满足25Gb/s NRZ 20km SMF传输系统的插损要求；从图8a可以看到，在啁啾因子α为-0.5时，有两种情况，一种是ER＝10dB，Uon＝0.4V，Um＝1.6Vpp，并且设置的第二EAM部分的长度L2＝100um，结合图8b，得知插损约为9dB； 一种是ER＝8dB，Uon＝0.4V，Um＝1.6Vpp，结合图8b，得知插损约为8dB，与现有EML相比，插损降低了约10dB。由此可知，本发明可以有效的降低插损，使得EML结构满足光通信系统的传输要求，并且与现有技术中第二种和第三种啁啾调制方式相比，不需要额外的增加SOA和移相器，降低了光通信系统的成本。In the embodiment of the present invention, the simulation result of the existing EML generating negative enthalpy is shown in FIG. 7a and FIG. 7b, and the simulation result of the negative enthalpy generated by the EML structure of the present invention is as shown in FIG. 8a and FIG. 8b, and the 啁啾 factor α is selected. When it is -0.5, the insertion loss of the existing EML and the insertion loss of the EML structure of the present invention are compared to judge the merits and demerits. As can be seen from Fig. 7a, when the 啁啾 factor α is -0.5, the reverse bias voltage is -1.4V to -1.5V, and in combination with Fig. 7b, the reverse bias voltage is -1.4V to -1.5V. The insertion loss is about 18dB. The existing EML produces negative enthalpy and cannot meet the insertion loss requirement of the 25Gb/s NRZ 20km SMF transmission system. As can be seen from Figure 8a, when the 啁啾 factor α is -0.5, there are two In one case, one is ER=10dB, Uon=0.4V, Um=1.6Vpp, and the length of the second EAM part is set to L2=100um, and in combination with FIG. 8b, the insertion loss is about 9dB; One is ER=8dB, Uon=0.4V, Um=1.6Vpp. In combination with Fig. 8b, the insertion loss is about 8dB, and the insertion loss is reduced by about 10dB compared with the existing EML. It can be seen that the present invention can effectively reduce the insertion loss, so that the EML structure satisfies the transmission requirements of the optical communication system, and does not require an additional SOA increase compared with the second and third 啁啾 modulation methods in the prior art. And phase shifters reduce the cost of optical communication systems.
从上述实施例可知，第一EAM部分正常工作，第二EAM部分接入啁啾调制信号，是实现新型EML负啁啾的关键，因此，光信号调制信号和啁啾调制信号的是如何生成的需要进行说明，下面通过实施例对光信号调制信号和啁啾调制信号是如何生成的进行详细说明，It can be seen from the above embodiment that the first EAM part works normally, and the second EAM part accesses the 啁啾 modulation signal, which is the key to realizing the new EML negative ,, therefore, how the optical signal modulation signal and the 啁啾 modulation signal are generated. Need to explain, the following describes how the optical signal modulation signal and the chirp modulation signal are generated by the embodiment,
请参阅图11，本发明实施例提供一种新型EML的啁啾调制方法，应用于如图9所示的新型EML的结构，啁啾调制方法包括：Referring to FIG. 11, an embodiment of the present invention provides a novel modulating method for EML, which is applied to the structure of a novel EML as shown in FIG. 9. The 啁啾 modulation method includes:
1101、激光器接收输入信号，根据输入信号生成光信号；1101. The laser receives an input signal, and generates an optical signal according to the input signal;
详情请参考步骤1001。Please refer to step 1001 for details.
1102、衰减器接收反向调制信号，对反向调制信号进行衰减处理，得到啁啾调制信号；1102. The attenuator receives the reverse modulated signal, and performs attenuation processing on the reverse modulated signal to obtain a chirped modulated signal.
本实施例中，光通信系统预先生成对光信号进行调制的正向调制信号及反向调制信号，正向调制信号及反向调制信号为NRZ信号。衰减器接收反向调制信号，对反向调制信号进行衰减处理，得到啁啾调制信号，即啁啾调制信号是幅度减弱的反向调制信号，仅仅是对信号幅度进行的衰减，相位不改变。反向调制信号和正向调制信号之间是已经做好了信号匹配的，信号匹配可以是正向调制信号及反向调制信号保持信号同步、时延固定或相位反相等。In this embodiment, the optical communication system generates a forward modulation signal and an inverse modulation signal that modulate the optical signal in advance, and the forward modulation signal and the reverse modulation signal are NRZ signals. The attenuator receives the inverse modulated signal, and attenuates the reverse modulated signal to obtain a chirped modulated signal, that is, the chirped modulated signal is an inversely modulated signal with a reduced amplitude, only the attenuation of the amplitude of the signal, and the phase does not change. The signal matching is performed between the reverse modulated signal and the forward modulated signal, and the signal matching may be a forward modulated signal and a reverse modulated signal to maintain signal synchronization, fixed delay or phase inversion.
1103、T型偏置器接收反向偏置电压及正向调制信号，根据反向偏置电压及正向调制信号，得到光信号调制信号；1103, the T-type biaser receives the reverse bias voltage and the forward modulation signal, and obtains the optical signal modulation signal according to the reverse bias voltage and the forward modulation signal;
本实施例中，正向调制信号是用于对光信号进行幅度调制，第一EAM部分正常工作状态时，需要施加反向偏置电压，由于反向偏置电压为直流电压，为了保护各信号及元器件不受直流干扰，T型偏置器获取反向偏置电压值及正向调制信号，将反向偏置电压加到正向调制信号中，得到光信号调制信号。In this embodiment, the forward modulation signal is used for amplitude modulation of the optical signal. When the first EAM part is in normal working state, a reverse bias voltage needs to be applied. Since the reverse bias voltage is a DC voltage, in order to protect each signal. And the components are not subject to DC interference, the T-type biaser obtains the reverse bias voltage value and the forward modulation signal, and adds the reverse bias voltage to the forward modulation signal to obtain an optical signal modulation signal.
需要说明的是，由于正向调制信号和反向调制信号是相对的，两者反过来 也是可以的，比如，反正调制信号用于生成光信号调制信号，而正向调制信号用于生成啁啾调制信号。It should be noted that since the forward modulation signal and the reverse modulation signal are relative, the two are reversed. It is also possible, for example, that the modulated signal is used to generate an optical signal modulated signal, and the forward modulated signal is used to generate a modulated signal.
1104、第一EAM部分接收T型偏置器发送的光信号调制信号，第二EAM部分接收衰减器发送的啁啾调制信号；1104. The first EAM part receives the optical signal modulation signal sent by the T-type biaser, and the second EAM part receives the 啁啾 modulation signal sent by the attenuator.
本实施例中，在T型偏置器得到光信号调制信号之后，通过与第一EAM部分的电极的连接，将光信号调制信号发送到第一EAM部分，第一EAM部分接收到光信号调制信号，在衰减器对反向调制信号进行衰减处理后，通过与第二EAM部分的电极的连接，将得到啁啾调制信号发送到第二EAM部分，第二EAM部分接收啁啾调制信号。In this embodiment, after the T-type biaser obtains the optical signal modulation signal, the optical signal modulation signal is transmitted to the first EAM portion through the connection with the electrode of the first EAM portion, and the first EAM portion receives the optical signal modulation. The signal, after the attenuator attenuates the reverse modulated signal, transmits the obtained 啁啾 modulated signal to the second EAM portion through the connection with the electrode of the second EAM portion, and the second EAM portion receives the 啁啾 modulated signal.
1105、EAM结构根据啁啾调制信号得到调制啁啾值，根据光信号调制信号和调制啁啾值对光信号进行调制。1105. The EAM structure obtains a modulation threshold according to the 啁啾 modulation signal, and modulates the optical signal according to the optical signal modulation signal and the modulation 啁啾 value.
本实施例中，由于第一EAM部分是处于正常工作状态的，那么已知第一EAM部分正啁啾时的啁啾因子α的数值，而根据第二EAM部分接收的啁啾调制信号对第一EAM部分产生的正啁啾进行补偿后，得到新型EML的整体器件的啁啾因子α的数值为调制啁啾值，具体的过程为：In this embodiment, since the first EAM part is in a normal working state, the value of the 啁啾 factor α when the first EAM part is positive is known, and the 啁啾 modulation signal pair received according to the second EAM part is After the positive enthalpy generated by an EAM part is compensated, the value of the 啁啾 factor α of the overall device of the new EML is the modulation 啁啾 value, and the specific process is:
假设第一EAM部分的长度信息为L1，第二EAM部分的长度信息为L2，第一EAM部分使用光信号调制信号对光信号进行调制时，产生的正啁啾，会导致调制前后的光信号的相位变化，记为第一相位偏移值
Figure PCTCN2016101774-appb-000002
而第二EAM部分的啁啾调制信号是幅度衰减后的反向调制信号，相位与反向调制信号一致，那么第二EAM部分导致光信号的相位变化，记为第二相位偏移值
Figure PCTCN2016101774-appb-000003
第一EAM部分和第二EAM部分总的相位偏移值为
Figure PCTCN2016101774-appb-000004
第一EAM部分和第二EAM部分总的插损，记为
Figure PCTCN2016101774-appb-000005
负啁啾产生条件为
Figure PCTCN2016101774-appb-000006
It is assumed that the length information of the first EAM part is L1, and the length information of the second EAM part is L2. When the first EAM part modulates the optical signal using the optical signal modulation signal, the positive 产生 generated will cause the optical signal before and after the modulation. Phase change, recorded as the first phase offset value
Figure PCTCN2016101774-appb-000002
The 啁啾 modulation signal of the second EAM part is an amplitude modulating inverse modulating signal, and the phase is consistent with the reverse modulating signal, then the second EAM part causes a phase change of the optical signal, which is recorded as the second phase offset value.
Figure PCTCN2016101774-appb-000003
The total phase offset value of the first EAM part and the second EAM part is
Figure PCTCN2016101774-appb-000004
The total insertion loss of the first EAM part and the second EAM part is recorded as
Figure PCTCN2016101774-appb-000005
Negative conditions are generated
Figure PCTCN2016101774-appb-000006
啁啾因子α的计算公式为：α＝2Δφ3dB/ln2，其中Δφ3dB表示Δφ取值的一半。The calculation formula of the 啁啾 factor α is: α = 2 Δφ 3dB / ln2, where Δφ 3dB represents half of the value of Δφ.
消光比的计算公式为：ER＝4.343·[A(V)-A(0)]L。 The formula for calculating the extinction ratio is: ER=4.343·[A(V)-A(0)]L.
从公式可知，调整第一EAM部分和第二EAM部分的长度、正向调制信号和反向调制信号的相位及反向偏置电压的大小等等情况，都可以影响整个新型EML的啁啾因子的数值，根据负啁啾条件设置后，得到啁啾调制值，根据光信号调制信号和调制啁啾值对光信号进行调制，并且新型EML的插损与现有技术第一种啁啾调制方式相比明显降低了，满足光通信系统的传输要求。It can be known from the formula that adjusting the length of the first EAM part and the second EAM part, the phase of the forward modulation signal and the reverse modulation signal, and the magnitude of the reverse bias voltage can all affect the factor of the whole new EML. The value is set according to the negative 啁啾 condition, and the 啁啾 modulation value is obtained. The optical signal is modulated according to the optical signal modulation signal and the modulation 啁啾 value, and the insertion loss of the new EML and the first 啁啾 modulation method of the prior art. Compared with the significantly reduced, it meets the transmission requirements of optical communication systems.
本发明实施例中，对光信号调制信号和啁啾调制信号的生成进行了说明，并且对调制啁啾值(即EML结构的整体啁啾因子α)是如何计算得到的进行了详细的说明，使得新型EML可以通过设计第一EAM部分和第二EAM部分的结构参数，随意调制所需啁啾值，甚至负啁啾。In the embodiment of the present invention, the generation of the optical signal modulation signal and the 啁啾 modulation signal is described, and how the modulation 啁啾 value (ie, the overall 啁啾 factor α of the EML structure) is calculated is described in detail. The new EML can be used to arbitrarily modulate the required enthalpy, or even negative enthalpy, by designing the structural parameters of the first EAM portion and the second EAM portion.
需要说明的是，第一EAM部分和第二EAM部分可以是两个分别独立的一段EAM；或者，EAM结构为一段EAM，在EAM结构中形成电隔离层，形成两段EAM部分，其中，连接激光器的为第一EAM部分。It should be noted that the first EAM part and the second EAM part may be two independent EAMs respectively; or the EAM structure is a piece of EAM, and an electrical isolation layer is formed in the EAM structure to form two EAM parts, wherein the connection The laser is the first EAM part.
需要说明的是，在现有的EML结构中，激光器一般选择具有布拉格光栅的CW激光器，有DFB或DBR，具体选择哪种，不做规定。It should be noted that in the existing EML structure, the laser generally selects a CW laser having a Bragg grating, and has a DFB or a DBR, and which one is specifically selected is not specified.
需要说明的是，对于前述的各方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本发明并不受所描述动作顺序的限制，因为依据本发明，某些步骤可以采用其它顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本发明所必须的。 It should be noted that, for the foregoing method embodiments, for the sake of brevity, they are all described as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence, because In accordance with the present invention, certain steps may be performed in other sequences or concurrently. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

Claims (11)

  1. 一种新型电吸收调制激光器EML的啁啾调制方法，其特征在于，应用于新型EML的结构，所述新型EML的结构包括激光器和电吸收调制器EAM结构，所述EAM结构包括第一EAM部分及第二EAM部分，所述第一EAM部分与所述激光器连接，所述第一EAM部分接入光信号调制信号，所述第二EAM部分接入啁啾调制信号，所述啁啾调制方法包括：A 啁啾 modulation method of a novel electroabsorption modulation laser EML, characterized in that it is applied to a structure of a novel EML including a laser and an electroabsorption modulator EAM structure, the EAM structure including a first EAM portion And a second EAM part, the first EAM part is connected to the laser, the first EAM part is connected to an optical signal modulation signal, and the second EAM part is connected to a 啁啾 modulation signal, and the 啁啾 modulation method include:
    所述激光器接收输入信号，根据所述输入信号生成光信号；The laser receives an input signal and generates an optical signal according to the input signal;
    所述第一EAM部分接收所述光信号调制信号，所述第二EAM部分接收所述啁啾调制信号；The first EAM portion receives the optical signal modulation signal, and the second EAM portion receives the chirp modulation signal;
    所述EAM结构根据所述啁啾调制信号得到调制啁啾值，根据所述光信号调制信号和所述调制啁啾值对所述光信号进行调制。The EAM structure obtains a modulation threshold according to the chirp modulation signal, and modulates the optical signal according to the optical signal modulation signal and the modulation threshold.
  2. 根据权利要求1所述的新型EML的啁啾调制方法，其特征在于，所述新型EML的结构还包括T型偏置器和衰减器，所述T型偏置器接入反向偏置电压及正向调制信号，并与所述第一EAM部分连接，所述衰减器接入反向调制信号，并与所述第二EAM部分连接，The EM modulation method of the novel EML according to claim 1, wherein the structure of the novel EML further comprises a T-type biaser and an attenuator, and the T-type biaser is connected to a reverse bias voltage. And a forward modulated signal coupled to the first EAM portion, the attenuator being coupled to the reverse modulated signal and coupled to the second EAM portion,
    所述啁啾调制方法，还包括：The 啁啾 modulation method further includes:
    所述衰减器接收反向调制信号，对所述反向调制信号进行衰减处理，得到啁啾调制信号；The attenuator receives an inverse modulation signal, and performs attenuation processing on the reverse modulation signal to obtain a chirped modulation signal;
    所述T型偏置器接收反向偏置电压及正向调制信号，根据所述反向偏置电压及所述正向调制信号，得到光信号调制信号。The T-type biaser receives a reverse bias voltage and a forward modulation signal, and obtains an optical signal modulation signal according to the reverse bias voltage and the forward modulation signal.
  3. 根据权利要求2所述的新型EML的啁啾调制方法，其特征在于，所述第一EAM部分接收所述光信号调制信号，所述第二EAM部分接收所述啁啾调制信号，包括：The 啁啾 modulation method of the novel EML according to claim 2, wherein the first EAM portion receives the optical signal modulation signal, and the second EAM portion receives the 啁啾 modulation signal, comprising:
    所述第一EAM部分接收所述T型偏置器发送的所述光信号调制信号；The first EAM portion receives the optical signal modulation signal sent by the T-type biaser;
    所述第二EAM部分接收所述衰减器发送的所述啁啾调制信号。The second EAM portion receives the chirped modulated signal transmitted by the attenuator.
  4. 根据权利要求3所述的新型EML的啁啾调制方法，其特征在于，所述EAM结构根据所述啁啾调制信号得到调制啁啾值，包括：The 啁啾 modulation method of the novel EML according to claim 3, wherein the EAM structure obtains a modulation threshold according to the 啁啾 modulation signal, including:
    获取所述第一EAM部分及所述第二EAM部分的长度信息； Obtaining length information of the first EAM part and the second EAM part;
    根据所述光信号调制信号得到所述第一EAM部分的第一相位偏移值，根据所述啁啾调制信号得到所述第二EAM部分的第二相位偏移值；Obtaining a first phase offset value of the first EAM portion according to the optical signal modulation signal, and obtaining a second phase offset value of the second EAM portion according to the 啁啾 modulation signal;
    根据所述长度信息及所述第一相位偏移值及所述第二相位偏移值，得到啁啾调制值。The 啁啾 modulation value is obtained based on the length information, the first phase offset value, and the second phase offset value.
  5. 根据权利要求1至4中任一项所述的新型EML的啁啾调制方法，其特征在于，The 啁啾 modulation method of the novel EML according to any one of claims 1 to 4, characterized in that
    所述正向调制信号及所述反向调制信号保持信号匹配，所述信号匹配为所述正向调制信号及所述反向调制信号保持信号同步、时延固定或相位反相。The forward modulation signal and the reverse modulation signal hold signals are matched, and the signal is matched to the forward modulation signal and the reverse modulation signal to maintain signal synchronization, delay fixed or phase inversion.
  6. 一种新型电吸收调制激光器EML的结构，其特征在于，包括：A structure of a novel electroabsorption modulation laser EML, comprising:
    激光器和电吸收调制器EAM结构；Laser and electroabsorption modulator EAM structure;
    所述EAM结构包括第一EAM部分及第二EAM部分，所述第一EAM部分与所述激光器连接；The EAM structure includes a first EAM portion and a second EAM portion, the first EAM portion being connected to the laser;
    所述第一EAM部分接入光信号调制信号，所述第二EAM部分接入啁啾调制信号。The first EAM portion is connected to an optical signal modulation signal, and the second EAM portion is connected to a chirp modulation signal.
  7. 根据权利要求6所述的新型EML的结构，其特征在于，所述结构还包括：The structure of the novel EML according to claim 6, wherein the structure further comprises:
    T型偏置器和衰减器；T-type bias and attenuator;
    所述T型偏置器接入反向偏置电压及正向调制信号，并与所述第一EAM部分连接，所述衰减器接入反向调制信号，并与所述第二EAM部分连接；The T-type biaser is coupled to the reverse bias voltage and the forward modulation signal and is coupled to the first EAM portion, the attenuator is coupled to the reverse modulation signal and coupled to the second EAM portion ;
    所述T型偏置器，用于根据所述反向偏置电压及所述正向调制信号生成所述光信号调制信号；The T-type biaser is configured to generate the optical signal modulation signal according to the reverse bias voltage and the forward modulation signal;
    所述衰减器，用于根据所述反向调制信号生成所述啁啾调制信号。The attenuator is configured to generate the chirped modulated signal according to the reverse modulated signal.
  8. 根据权利要求7所述的新型EML的结构，其特征在于，The structure of the novel EML according to claim 7, wherein
    所述第一EAM部分及所述第二EAM部分为EAM。The first EAM part and the second EAM part are EAMs.
  9. 根据权利要求7所述的新型EML的结构，其特征在于，所述结构还包括：电隔离层；The structure of the novel EML according to claim 7, wherein the structure further comprises: an electrical isolation layer;
    所述电隔离层处于所述第一EAM部分和所述第二EAM部分之间。The electrically isolating layer is between the first EAM portion and the second EAM portion.
  10. 根据权利要求6至9中任一项所述的新型EML的结构，其特征在于，The structure of the novel EML according to any one of claims 6 to 9, characterized in that
    所述正向调制信号及所述反向调制信号保持信号匹配，所述信号匹配为所 述正向调制信号及所述反向调制信号保持信号同步、时延固定或相位反相。The forward modulation signal and the reverse modulation signal keep the signals matched, and the signals match The forward modulated signal and the inverted modulated signal maintain signal synchronization, fixed delay or phase inversion.
  11. 根据权利要求10所述的EML结构，其特征在于，The EML structure according to claim 10, characterized in that
    所述激光器为连续式CW激光器，所述CW激光器包括分布式反馈激光器DFB和分布布拉格反射激光器DBR。 The laser is a continuous CW laser comprising a distributed feedback laser DFB and a distributed Bragg reflection laser DBR.
PCT/CN2016/101774 2016-10-11 2016-10-11 Structure of novel electro-absorption modulated laser (eml) and chirp modulation method WO2018068200A1 (en)

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